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U.S. Vintage Trans-Am Racing Part 2

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Old 03-03-2014, 07:47 PM
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Originally Posted by nascarkeith View Post
Hello, fellow VTA'ers. I need a little set up advice.

Below are pics of the track and my set up then I will discuss my issues.






The car is very stable and easy to drive. I have plenty of speed and torque. No one passes me on the straights and I have a ton of pull coming out of the turns. Where I get beat is the middle of the corner. I have to turn the wheels pretty sharp to make the corner so it scrubs a ton of speed and pushes to the outside allowing me to get passed on the inside.

The fast guys who are racing me comment on how close my car is. They tell me it needs freed up just a little. I just haven't been able to hit that magic set up. A fast lap is a 9.5 and my best is a 10.0.

So let's hear it. What do you all think?
How are you setting your droop? Are you using setup blocks and setting the droop to 7mm front and rear? If that's the case, I'd think your car doesn't have enough droop, and not transferring enough weight to the front tires once you lift to enter a turn. Try setting the droop to 6mm in the front and 5mm in the rear, and see if that makes a difference.

You could also try adding some drag brake in small increments - with a one-way in the front, your car should initiate turns a lot better since you're using rear brakes exclusively.
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Old 03-03-2014, 08:08 PM
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I like how hard the one way pulls out of the turns. I had wondered about droop. I will add that to my list of things to try.
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Old 03-03-2014, 08:27 PM
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Originally Posted by nascarkeith View Post
Do they make plastic 2.0 toe blocks for a TC4 or do you have to pony up for the aluminum ones?
You'll need ASC31069, the aluminum one.
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Old 03-03-2014, 08:32 PM
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Originally Posted by nascarkeith View Post
I like how hard the one way pulls out of the turns. I had wondered about droop. I will add that to my list of things to try.
It will pull the same with a spool, because on-power, that is basically what a one-way becomes.
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Old 03-04-2014, 07:36 AM
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IMO, the spool has more of a push to it than a one way, under acceleration in a turn. Your results may vary.
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Old 03-04-2014, 08:19 AM
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Originally Posted by NutDriver View Post
IMO, the spool has more of a push to it than a one way, under acceleration in a turn. Your results may vary.
If you're under constant acceleration, the spool and one way will act identically. However, if you're in a turn and power to the front is disrupted (e.g. over a bump, or the driver lifts to adjust their line), the one way could disengage momentarily and give you a little more steering. Otherwise, both axles should provide excellent steering while on power in a corner.
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Old 03-04-2014, 12:39 PM
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Where do you get a one-way or a spool for a tc4.

I see some tc3 nitro one ways ... Do they fit? Do you cobble together tc5,6 pieces?
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Old 03-04-2014, 12:49 PM
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Originally Posted by Teamhotrods View Post
Where do you get a one-way or a spool for a tc4.

I see some tc3 nitro one ways ... Do they fit? Do you cobble together tc5,6 pieces?
The "Poor Man's Spool": leave the balls out of a ball diff, assemble with a light film of Weldwood contact cement on the faces of the diff rings.

This isn't recommended for diffs using plastic outdrives.
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Old 03-04-2014, 12:59 PM
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Originally Posted by IndyHobbies.com View Post
Here's some photos from last night at Indy RC.
looks like a sweet spot. What kind of chassis are you guys runnin ?

Ive got a TA TC4 im building so i think its going to be good for VTA class.
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Old 03-04-2014, 01:01 PM
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I ran a one way bearing in place of the front shaft cup. It would disengage the whole front drive off power. For a long time, this was in the rules as not legal and I removed them from my TC3s.

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Old 03-04-2014, 01:07 PM
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I know that my memory is not flawless, but I do not remember that being the case in the national rule set. (USVTA rules) Now I do remember some big races not allowing front one ways, but that was in addition to the USVTA rules. Kind of like lipo sak rules are at some tracks but not in the USVTA rules.
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Old 03-04-2014, 01:36 PM
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Another poor man's spool is to take the diff rings out of the stock TC4 ball diff and replace them with TC5 slipper pads. I haven't done it myself (yet. I have the parts), but I'm told that it's very much like a spool, but the slip under heavy load (like hitting the wall, etc while on power) is easier on gears, outdrives, etc.
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Old 03-04-2014, 04:15 PM
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Originally Posted by liljohn1064 View Post
I ran a one way bearing in place of the front shaft cup. It would disengage the whole front drive off power. For a long time, this was in the rules as not legal and I removed them from my TC3s.
It was never a national rule that you could not run a 1-way. There were only a hand full of local track rules. There was a ban on them from the USVTA Scale Nats but that was only for 1 of the 7 years its been running. I ran one last year at the scale nats as did a few others. Its more a tuning option than it is anything else. I dont run it all the time but there is a time and a place where I like it better over a spool.
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Old 03-04-2014, 04:26 PM
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Originally Posted by oeoeo327 View Post
If you're under constant acceleration, the spool and one way will act identically. However, if you're in a turn and power to the front is disrupted (e.g. over a bump, or the driver lifts to adjust their line), the one way could disengage momentarily and give you a little more steering. Otherwise, both axles should provide excellent steering while on power in a corner.
Less braking force with the one way (only rear brakes) and from my experience much more off power steering than a spool right up to the point you start accelerating out of the corner then they are about the same. I like the spool as my car brakes better and turns in much more predictably than with the one way. I've read some are using front gear diffs with very heavy oil (or putty). I got a gear diff, but haven't tried that yet. Should be very similar to a spool but perhaps more forgiving on parts upon a heavy hit. But both my USVTA and USGT cars are within 2 grams of the weight limits now and I don't want to add any more weight.

Last edited by John Wallace2; 03-04-2014 at 06:10 PM.
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Old 03-04-2014, 04:33 PM
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Is my computer broken or is the exclusive Novak dealer selling boss motors for $100

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDRYF

if you buy 12 then there only $94.50
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