On The Hill Gang Slot Racing Club
Daniel's Guide to Race Car Preparation


Hi Guys!

I asked Stephen if I could update my article on race car preparation on the website because I think it will be of great help to the new racers who plan to join or have joined the club.


I remember when I joined it was difficult to know what to do or where to start in prepping a car. Everyone in the club was really nice and helpful in answering any questions I had, but it would have really been nice to have a guide to follow. For the most part, the books I purchased just gave a few tidbits on tuning but nothing that went into great detail or explanation on how and why something was done.


So I hope this article is helpful and beneficial to all that enjoy the hobby as much as I do.
And as always, I like to add that there is always more than one way to do what I’m describing in the article, these are just the way I do it. And as you will soon find out I tend to take the loooooooong way to grandma’s house.
J

 

Categories

  • Selecting Your Class Car(s)
  • Tuning Your Car
  • Practicing With Your Car
  • Race Day Preparation
  • Racing Strategy
  • Racing Tips
  • Advanced Car Preparation Techniques

 


SELECTING YOUR CLASS CAR(S)

 

Try to get at least 2, if possible 3 cars in each class so you have something to compare with and see which one handles best, which car is faster, and which one fits your driving style. If you are lucky, you might be able to get the three aforementioned qualities in one car but usually you have to give a bit one way or the other.  Meaning you might have to sacrifice a bit of speed for handling or vice-versa. So in this instance your driving style will come into play because if you have a steady hand at the controller and control your car really well, you might be able to get away with the car that has a bit more speed. If you have trouble controlling your car you might opt for a car with better handling. Then there are the guys on the other end of the spectrum who are not as concerned about being competitive, they just love to drive the car they have admired through childhood just for the sheer enjoyment of seeing it slide around the track. Well, that’s OK too. J

 

I will use the Ninco 1950/60’s Le Mans Roadster Class in this example. I purchased three, Austin Healey, AC Cobra, and Ferrari 250TR.  I looked in the catalog and noticed the overall design of each car and had an idea that for my driving style, which I will explain later, the Ferrari would probably be a good fit.

So I took the magnets out of the cars that had them (if any) and stuck in the NC-1 motor (with adapter, if needed) and basically practiced with them around the track.

 

As expected the Ferrari, with its flat low profile stance, handled better, for me, than the other two cars. So I selected the Ferrari for the club races.  Another great thing about having more than one class car is that if things don’t go as well as you had hoped in the club races you can always change to another car.   In the SCX F1 class I started with the Minardi, went to the Lola Ford Indy, then went back with the Minardi and now I am back with the Lola Ford Indy (McLaren).  So you always want to remain flexible and keep your options open about using any car.

I will continue this article using the Ninco Roadster Ferrari 250 TR as the example.

 


TUNING YOUR CAR


Well the first thing I did was pop the hood on my yellow Ferrari 250 TR.  Actually, I took the body off, but the other way sounds like I know what I’m doing.
J

Break-In The Motor

I start off by removing the motor and going through all the steps listed in the “breaking in the motor” article. http://www.farroutslotcars.com/Slot-Car-Motor-Tuning-Tips-And-Tricks.html

 

Front Axle, Guide and Braid

Next I check out the front axle assembly.  I place the car on a tech board, which is just a board with a groove running down the middle so that when the car is placed on the board the guide can fit down into the groove and the car can rest on all four wheels. I place the car on the tech board to see if the guide goes all the way down into the slot, to see if all four tires are touching, and get an idea of the ground clearance between the chassis and the board.

 
Usually with Ninco cars there is a lot of vertical free play in the front axle, so when the car is placed on the tech board the front axle will adjust (move upward) until the front wheels touch the board.  So in the case of the Ferrari the guide went all the way down into the groove which is what I wanted. The farther the guide is in the groove the better the contact of the track rails and braids which means better electrical conduction and therefore better motor performance.  If for some reason the guide didn’t go all the way down into the slot the first thing I usually do is check the axle assembly for proper vertical movement. Sometimes there is some plastic flash left in the vertical axle groove holder on the chassis and it prevents the chassis from moving upward. All that is needed is to remove the flash with a hobby knife.

 

On other brands of cars, there is not a lot of vertical movement so if the guide doesn’t go all the way down I usually remove the front tires then check it again on the tech board, if the guide goes all the way down then the tires are the problem.  All that is needed is to true the tires until their diameter is small enough so that they will allow the guide to go all the way in the slot and still touch the track. Club rules say all tires much touch the track, so you have to slowly remove the tire rubber and retest frequently.  I guess the easiest way of truing the front tires is to remove the rear tires and place the front tires on the rear wheels and true them with sandpaper. That’s assuming the wheel sizes are all the same size which they are on the roadsters. Or if you have access to a RSM truer you can remove the whole front axle assembly and place it on the RSM machine. Since you basically want the weight of the front of the car to be more on the guide than the front wheels you really just want to make sure the front tires roll when you push the car forward.

 

Poor braid position could be another reason the guide will not sit all the way down. I usually have my braids positioned fairly flat against the flat part of the guide with a very slight downward curvature (towards the rails) of the last 2mm’s of the free end of the braid.

 

Lateral Front Axle Theories 

Most if not all Ninco cars come with a fair amount of lateral and vertical free play on the front axle. The vertical play doesn’t seem to affect the cars handling so I leave that alone. Supposedly the vertical play will allow the front of the car to absorb irregularities on the track and allow for the axle assembly to move up and down instead of the front portion of the car moving up and down which could cause your car to de-slot.

I use to keep my lateral movement in the 1-2mm range, but through consultations with Michael Smalley and his reasoning behind mostly leaving the lateral movement alone, I have found that my cars handle better using his method.  I refer you to his article for a thorough explanation, but basically the outside tire being able to slide/move-outwards as the car travels around a curve enables the car to be more stable and you can actually take the corner faster.  With it all being so subjective, the only way to find out for sure which method works for you is to practice with the car as is (stock)  and practice with a decreased lateral movement and see which you like best.


If you decide to decrease the lateral movement it is just a matter of removing the wheels and adding spacers of equal size and number on each side of the axle, then replacing the wheels and positioning them until you have the desired lateral movement. I mentioned putting the spacers on in equal numbers because I’m always concerned about balance when tuning. Even though the spacers weigh less than a gram, I try to keep everything balanced because after a while the various weights of objects placed on cars start to add up and if one side of the car is heavier than the other it can lead to handling problems. Also, you have to keep in mind that you must have enough axle left on each side, after placing the spacers, to push the wheel back on far enough where it can’t fall off, and keep the tires/wheels within the bodywork.

 

Front Wheels
Once all the aforementioned tire truing, axle movement, and guide adjustments are done to your satisfaction the front wheels are glued on. Usually the wheels have a snug fit but it’s still a good idea to glue them because after a while they might begin to move which would allow your spacers to move and throw-off your lateral movement.  Or your hubs could fracture and cause the same thing.

I usually start by roughening the end of the axle with a stone bur on a Dremel, to remove any paint, and to allow for the super glue to grab onto. Then I clean the axle with adhesive remover and place a very small amount of oil around the spacer adjacent to the wheel just in case some super glue gets in the spacer area. Then you can either place a small amount of glue at the end of the axle or inside the wheel, (I have used both methods with decent success), and finally slide both wheels on the axles. You have a small amount of time to adjust the wheels to exactly where you want them before the glue dries. I prefer the super glue method but you can also use some 5-minute epoxy to give yourself some extra working time.

Also, a tip that I learned the hard way………it’s a good idea to reinforce the hubs of all four tires with super glue or epoxy. I have had the worst time with fractured hubs especially on the SCX 4WD cars, and they are the hardest to get replacements for.  Reinforcing the hubs does help.  I just dip a toothpick in superglue and place it around the whole outside of the hub after the hub is on the axle. I also use super glue zapper to harden the super glue within a couple of seconds to make the job easier.

 

Rear Axle
Next I move to the rear axle assembly.  Some cars have the bronze bushings already in place, if not club rules say we may change the plastic bushings for the bronze bushings. The bronze bushings will improve the car’s speed and handling. They do wear out at some point so it’s very important to check them fairly often to make sure there is not a lot of vertical or horizontal free-play of the axle.  (see also Advanced Car Preparation Tips – below)

 
So, once I make sure the bushings fit the axle  I put the whole axle assembly back in the bushing holders and make sure the bushings go all the way down in the holder and that the bushings have a snug fit.   Then I place the whole axle assembly on a RSM truing machine. I’m still learning how to use this machine properly so I won’t even begin on how to tell someone else how to use it. [maybe an expert like Mr. Smalley will give a free RSM truing seminar one day.
J

 

Once the axle is rotating on the RSM machine I check to make sure the crown gear doesn’t wobble. A crown gear that wobbles will cause vibration and handling problems. Usually a crown gear that wobbles may be cracked, so the easiest remedy is just to replace it (use a gear puller to do this).  Also check the crown gear for looseness on the axle, sometimes you are able to move them with your hand. If it’s too loose then replace it. It should have a nice snug fit. I also place a drop of super thin penetrating super glue between the axle and crown gear to make sure it can’t move.


Next we check the wheels (without the tires) to make sure they are rotating as straight as possible. This is an extremely important step…….wobbly tires will cause your car to vibrate and de-slot prematurely. It’s worth it to buy some extra wheels to get the best fitting pair on the axle.
If you look at the cars of the top three guys in the club……..Myself, Rene, and Michael, you will find that their wheels and tires are perfectly trued.  This is one step that you just have to take your time on and get as perfectly as possible.  And if you have problems getting it right, it’s worth it to get help. I didn’t realize the importance of it until earlier in 2006 and had to call in Michael for some assistance and I feel my results have improved because of what he taught me.


That’s the great thing about this club…..everyone is happy to lend a hand. All you have to do is ask.

 

Tire Truing

Now that your wheels are perfectly trued, you can place the tires on and get them trued well. The tire truing is another extremely subjective area. When you are starting off you basically just want to get your tires trued well enough for your car to handle properly. 

 

But as your experience increases you will learn to true your tires in a way that gives you not only great handling but can also give you torque, acceleration, braking and top speed choices depending on what you need in terms of the track you will be racing on or the type of car being raced.  For example….on a small track like Gary’s that has a lot of curves and a small straight-away I would use smaller diameter tires which would give me more torque/acceleration to hopefully get through the curves fairly quickly. The smaller diameter tires would give less top speed so that would be the trade off, but since the straightaway is short I hope that I would not lose too much to the other racers.    For a more open track like Chris’s, I would use a larger diameter tire for more top speed for the long straight at the expense of a bit of braking/acceleration/torque.


The challenge is to find just the right amount of what you need for the track you are on and the cars being raced.  So you can see that knowing how to true tires properly can open up a world of possibilities.  
But when just starting out, it’s more important to concentrate on developing your driving style rather than the advanced techniques.   Maybe Stephen will let me write an article on advanced techniques if I ever finish this one. J

 

So once the tires are trued to your satisfaction you can glue them on the wheels if you like. I tend to wait until I practice on race day until I glue the tires. Since I usually bring 2-3 pairs of tires, I like to make sure which ones I’m going to use before I glue. I guess an argument can be made on whether tires need to be glued at all. I think there is a very slim chance that the tires would dislodge on their own, but my concern is that when the car is being marshaled quickly there is a higher percentage that the tire might be inadvertently moved off the wheel, especially with the smaller classic 20 x 7 tires for the Ninco 1950/60’s Le Mans class. So you place the axle assembly back in the car.


At some point you will have to place the motor back in the car to make sure the lateral movement is OK.  I really have no set plan as to when I do it, I just make sure to check it before I glue the wheels on the axle. Usually with the self-adjusting crown gear, once the motor is in place the motor axle goes into the crown gear groove area and provides just the right amount of lateral movement of the axle and therefore no spacers are needed. But if I find that there is still a bit too much lateral movement I will just follow the same steps of adding spacers as with the front axle.  Once everything is OK I will glue the wheels on the axle.
Then some practice laps are run. If the car doesn’t handle well you may want to use smaller diameter tires which will lower the chassis closer to the ground and allow for better handling. If the car seems a bit slow you may want to use larger diameter tires which will give you more top speed. That is why I like to have 2-3 sets of tires at race day to give myself some choices.
Once everything is OK, it’s a good idea to glue the bushings down so they don’t pop out of their holder or rotate.   I use ‘Goo’ to hold down the bushings. Goo is an adhesive that sets up firmly but is not rigid, so it’s easy to remove. You can also use a hot glue gun.

 

Motor Check

Now I check out the motor. It should always be properly broken in.


I always remove the paper on the motor to expose the air vents to hopefully allow it to run cooler. I think the Ninco motors run better when they have a chance to cool off, but the SCX motors seem to run better when they warm up. I will check the pinion to make sure it’s tight on the motor axle, if not I will replace it. I check the wire solder joints to make sure they are OK. If they are loose or just don’t look like a strong joint I will redo them. I place the motor lead eyelets in the guide and Goo them into position as well. The last thing I need is for an eyelet to pop out during a race. Oil the motor if needed and replace it in the car. 

 

I put some Goo on each side of the motor can to keep it in position and I usually let all the places I placed Goo dry over night. After the Goo is dry I will break in the gears following the gear break in procedure.   I use a toothbrush and a motor cleaner (Duratrax Power Shot or Pure Performance) to make sure all the compounds are off the gears and then oil the bushings, motor, crown gear, and pinion.

 

It’s also a good idea to glue down any parts on the chassis or car body that can dislodge like mufflers, interior detail, front and rear lights or anything else that can possibly come loose during a crash. Or if you prefer, club rules say we can remove delicate items that could be broken during a race.


PRACTICING WITH YOU CAR


Once you get the basic tuning done on the car you want to try it on the track. Things you want to look for while turning laps………handling, listening for any abnormal sounds, vibration, de-slotting for no reason and speed.

 
Handling problems, which can include too much or too little sliding around the curves, are usually the result of improperly trued tires or tire selection – you may need grooved or slicks.  Through experience you will learn how to true the tires depending on your driving style, that is, whether you want the car to slide a bit around the curves or a car that grips hard around the curves.


A quick method for checking for evenly trued tires is to place the car on a tech board and view the tires from the rear. Both tires should be totally flat on the board and should stay flat when the car is moved forward or backward on the board.


Another major problem that will result in poor handling is an improperly balanced car. This will usually only be a big problem in the classes that we are allowed to use lead weight.  Finding the ideal weight and locations is a tedious process but is rewarded with a better handling car (see the weight placement section of the website).


Abnormal sounds and vibration can be caused by a bunch of things which include: rough gear mesh or a spur on the gears (usually the crown gear), out of round wheels and tires, loose interior body parts, poorly fitting axle bushings, or just lack of oil.

 

De-slotting can be caused by the guide complex (guide, braids, and motor lead wires) or the front axle assemble.  Motor lead wires could be too short and not allow for the full rotational movement of the guide. Braids could be improperly positioned causing the guide flag not to go all the way into the slot. The front axle tires might not be trued enough, and again, the guide is not going all the way in the slot because of the tires.  You also want to check that the axle assemble is not stuck in one position and able to move freely.

 

You also want to test out different motors to find the one that may not necessarily be the fastest but one that suits your driving style as far as torque and RPM’s are concerned.  When first learning to drive you may not be as smooth on the throttle so you may want a motor that has the torque spread out over the voltage range rather than one that gives a lot of torque from the start which could cause a loss of control of the car.  This is especially true of the SCX motor which, in my opinion, is the most difficult to master, both in F1 and 4WD classes.

 

Once the car runs pretty well and I have everything glued down, I evaluate whether the car runs better with a tight or loosely fitting body. I can’t explain it, but some cars just run better for me with a tight body and others run better with a loosely fitting body. If I decide to use a loosely fitting body, I will use the longer Ninco screws which make the task easier of allowing the body to remain loose. Club rules say we can use whatever works in regards to body screws.

 

RACE DAY PREPARATION


Everybody has their own way of preparing for the race. I will just list a few of the things I concentrate on.  It’s much more challenging this year because we have more venues.

The first thing I look for while running practice laps is what type of traction the tires are getting.  As mentioned, I usually bring 2-3 pairs of tires which are trued differently to hopefully find a pair that gives me the proper grip for my driving style.  I will also find the areas of the track where I can go full throttle, but still keep the car under control without the backend sliding all over the place.  Most tracks have a chicane so I will see how quickly I can go through the chicane without de-slotting and still keeping the car under control.

I have never been much for getting the times of my laps, during race day practice, because everyone is going to slow down when the race starts anyway and just because you have the fastest time in the heat doesn’t mean you will win the heat. But, occasionally, if I can’t decide on which two pairs of tires are giving me the best grip I will use the lap timer to assist me in making the decision. Usually, (if we are allowed!), I will spend more time practicing on the difficult lanes (usually the outside lanes), but it depends on the track. For some reason I have more trouble on the inside lanes at Chris’s place so I tend to practice more on the inside lanes there.

 

So you have to make constant adjustments and change your game plan around as needed. That is one thing I try to keep in mind….never be afraid to change a losing game.  Basically, I just try to make sure the car runs closely to the same on the host track as it did on my home track.


RACING STRATEGY

 

If at all possible, try to make sure your car is at least 1/10TH of a lap ahead of everyone else’s car in the race when the stop and go box, ‘STOPS’. J

 

RACING TIPS 

 

I do a few things during the races that I’m sure everyone else is doing also but I will just mention them.

Getting grip is always of paramount importance so I use the method of putting a few drops of PPR tire cleaning solution on a rag and wiping it around the tire once - PPR Slots Super Tire Cleaner (www.pprslots.com). Then I take the lint roller (a masking tape roller works best for me, rather than the 3M Lint roller) and just keep rubbing the tire until it begins to pull back on the roller. It takes about a minute for this to happen, but once it pulls back against the roller I usually get very good grip on the track. I do this before the start of every heat so if I run practice laps I have to redo the procedure before the start of the heat.


To clean the braids I use
a very small amount of the Parma braid conditioner. Again, if I run practice laps I re-clean the braids before the heat. Sounds like a pain to have to redo everything but grip is everything and even a slightly dirty braid can slow your motor dramatically.

 

Things I concentrate on once the race is about to begin is whether or not to try and get the lead or hold back.  Usually if  I’m on the outside lanes I try to get into the lead, but if I’m on the inside lanes sometimes I will let the other drivers clear the first turn first and just follow closely behind.  To me there is nothing more frustrating than falling off on the first turn of the race, kinda sucks the air out of ya. J  I figure even if the race ends as it starts I will only be about one-two 10th’s of a lap behind the leader whereas if I would have fallen off I could be quite a few 10th’s of a lap back if not more.

 

Another thing I think about…...  naturally when you fall off there will be a tendency to put more pressure on yourself by racing harder trying to catch the bunch, and this in turn can lead to more mistakes.  That is what I have admired about Rene, with all his success throughout the years, he always stays within himself during the race, you never see him over-driving and making mistakes.
I just basically concentrate on not doing anything stupid, which is not easy, and keeping myself in the race.  I keep reminding myself that you can’t win a race in the first two heats but you sure as heck can lose it.

Of course, having fun is the number one priority and I must admit, in the heat of battle I loose site of that, but with the ‘cast of characters’ in our club you will always find yourself smiling and laughing throughout the race day.

 

These are just some of the things that I do because I enjoy the hobby so much. A car right out of the box with a minimum amount of prepping can also be competitive, as Michael Smalley has proven time and time again.  So it basically comes down to how much time you want to spend on everything. 

 

Finally just some tidbits I thought would be helpful for those that want to go beyond the basic preparation techniques.

 

ADVANCED CAR PREPARATION TECHNIQUES


These are additional preparation techniques that I do to hopefully bring out all the car’s performance and handling capabilities.

 

Wires, Eyelets, Screws, Bushings, Spacers and Other Small Details 

Keep in mind that club rules state we can use whatever works in regards to screws, wires, spacers, eyelets, and bushings (except ball bearings ). So it’s a good idea to experiment with different varieties and manufacturers of these products to see which, if any, may enhance the car’s performance.

 

I always change my motor wire to the Slot.It silicon cable (SISP03)……I like it because it has thick wiring and is very flexible.  For the eyelets I use professor motor 85% copper eyelets (PMTR1062).  With the Slot.It wiring and the copper eyelets I always get a faster motor than with the stock wiring, per the Kelvin Light Bench readings.  I also have more confidence in the thick Slot.It wiring than the thin Ninco wiring especially since I have had the Ninco wiring break on me. Thank goodness it was in practice. J  I like it better than the SCX motor wiring because even- though the SCX wire is thick, it can sometimes hinder the movement of the guide because the wiring is somewhat stiff. The silicon wiring is soft and flexible and allows for easy movement of the guide.

I try to use the Ninco ProRace metric brass screws (NIN80906) when possible because they screw in snugly and still allow for body movement. Also, they weigh a tiny bit more and act like weight to lower the center of gravity of the car. [yeah, I know this is stretching it a bit, but it’s a nice thought, huh ? J] If I can’t use the brass screws then my second choice is the long Ninco screws. (NIN80902).


With the bushings I just see which manufacturer (Fly, Slot.It, Ninco) fits the axle the best. This is such an important step and worth taking your time on because a bushing that just allows for rotating movement without a lot of vertical and horizontal movement will mean a much faster and smoother running car.  Michael Smalley swears by Slot.It Double Brass Bushings (SIPA27)

 
Painting the body is also something I believe will improve handling. I guess it’s the added weight or the stiffening of the body, I really don’t know but in my opinion it makes a difference in the way the car handles.  Even if you don’t want to go through the trouble of removing the old paint or sanding you can still apply 2-3 coats of clear gloss coat.  The gloss coat application just requires removing all the fingerprints from the already stock painted body with a micro fiber towel, removing or masking the windows and just spraying on the gloss coat. I usually apply one coat a day and put on about 3 coats. I use the Testors gloss clear coat spray (#1814). 

Tire truing is also a very important area where you want to spend a lot of time. When you think about it, other than the braids, the tires are your only contact with the track, so you really want to make sure the tires are as perfectly trued as you can get them.  I now spend more prep time on the tires than any other area.  I feel I have improved in the area but still have a long way to go to reach the level of the Smalley’s and the Farr-Jones’s.  

If you have no idea how to go about it, I can just recommend looking at some of the experienced racer’s car tires and asking them what machines or instruments they used to true them.  There are so many ways of going about it, so you just have to find a way that works for you. If you have the time to run hundreds and hundreds of laps, this will also true your tires, especially if you have a Ninco track. J

 

Adding lights to the car can also benefit the handling because of the added weight – and it is completely legal! Depending on the lighting kit being used you can usually add about 3-5 grams of weight to the car along with that cool looking glow. The weight addition doesn’t sound like much but the difference between a car weighing 80 grams instead of 75 grams can make a huge difference in the way the car handles. I like the Slot.It lighting kits the best (SISP10 & SISP11) because they have a separate plug in module which allows you to have the wiring on the body and the base module on the chassis. That way you can separate your body from the chassis and not have the wiring in your way. It’s a direct drop in for the Slot.It cars but can take a bit of work to fit other cars.  But there are many lighting kits (Overdrive, Ninco, Cartrix) that may be an easier fit for other cars.

 

As with anything…………practice makes perfect!!!!!!!!!!!

The above procedures are all secondary to practice and improving one’s driving technique. 

 

[SFJ’s Note: the following is directly from Daniel’s answer to the 2006 Questionnaire – Do you practice between races?”: “I will run anywhere between 2000-5000 practice laps.  I once asked Chris R. why he is so good. He replied I try not to fall off. Pretty basic answer I thought at the time, but reading between the lines I guess another way of saying that is: Practice!” 

 

FYI Daniel has now (in 2007) cut back drastically on his practice, he usually does only 2000 laps!  I now run closer to 2000 laps but I always practice against a magnet car set at a voltage where the magnet car runs about 2 to 3 10th's of a second faster than I can do a lap and try to keep up with it. I also practice at a couple of volts higher (on my lane) than I think the club race voltage will be. This is usually around 15v, so between trying to keep the car on my small twisty-curvy track with 2 crossover tracks at 15v and trying to keep up with a magnet car that I know will never fall off, I think this type of practicing has been more beneficial because it has improved my reaction time and has made me mentally tougher.”]

 

FINAL THOUGHTS

 

We have a great website that basically has all of this I have just mentioned. I just tried to expand on certain aspects that might make it even easier for newbie’s. The website is packed with helpful explanations and tips and really requires reading 2-3 times to really grasp all the information available.  Stephen has done a great job of keeping the FarrOut user friendly especially for members who don’t have enough time for all the small stuff but just want to come out and race and have fun.


I just thought I would mention the above techniques for club members who have a bit of time on their hands and would like to experiment.


HAPPY RACING!!!!!!!!!!!!

Last updated on

Locations of visitors to this page