MD

iTrader: (136)

squarehead - Thanks.

Rob B99

iTrader: (15)

thanks for the help guys ......

nashrcracer

iTrader: (1)

ran the region 5 race at Indy back in April went with a gear diff with 100,000 in it. it was butter.

robk

iTrader: (22)

Any front drive is legal, but as it was noted before, some tracks/events outlaw one ways.

That being said, gear diffs are the bomb.

snoopyrc

iTrader: (2)

Have you been running an FF? Do you have something that you like? In particular?

TWILL

iTrader: (12)

Whats the difference between a one way and a spool????

snoopyrc

iTrader: (2)

A spool is like positraction. There is no differrential action at all. Front wheels brake and bite with the driveline.

A one way will allow the front wheels to free roll ahead of the drivetrain, So when its coasting or rolling down its similar to a RWD car, but when the gas is punched the front wheels dig in and pull. Almost in a ratchet type of movement.

robk

iTrader: (22)

No, not front wheel drive, I just mean any thing, spool, diff, one way, etc., is legal.

I do like gear diffs, since they have total lock up going forward but still have diff action. You don't realize how much a ball diff slips until you try a gear diff.

snoopyrc

iTrader: (2)

You know what? I saw that and just brain farted. I thought I was in the USGT thread when I asked you that.

squarehead

iTrader: (75)

Well, Kent is partially correct. Not like Posi-Traction at all, though, which is still a gear-driven limited slip differential. In a Posi, you can turn a corner with one wheel driving through the corner, and the other wheel not putting down any power at all (remember the legal strategy in "My Cousin Vinny").

A spool, properly installed, is a live axle—or solid axle, like a go-kart. There is ZERO slip between left to right side drive wheels. In this case, the front tires turning a corner are turning different radii, and relying on the slippage of the tires instead of a differential. Think of trying to make a rolling pencil turn a corner.

A one-way is just that—it's driving in one direction via a needle roller bearing. On power, it is driving forward via needle bearing friction in it's housing, and each wheel will slip on it's own necessary need. Once power is off, the bearings will allow it to spin freely with little internal drag, and behave like a 2wd car. Braking ability is decreased by 50% in a 4wd car, and again like lower class racing karts, only will use braking through the rear axles. For some, this is a really difficult setup to handle, and many prefer to not use it. A front one way is really nice in a situation where the track is flowing, long, and fast, and requires very little braking at all—if any. The car will have less drag from the setup, as it will behave as a 2wd drivetrain without a front differential.

One-ways are not recommended for new, inexperienced or slower drivers. The benefits are usually outweighed by the negatives for drivers who tend to make more than one mistake a race.


Make sense? HTH

Flying Monkey

iTrader: (54)

when turning with a posi, both tires are going at same speed. With big rear tires your inside tires will squawk because its trying to turn the same speed as the outside tire but not going the same distance. When i was groing up we built my dad a 68 camaro like the old road racers with fender flairs with a posi ford 9" rear. He has 17 1/2" of tread in the rear and when he turns a sharp turn or corner the inside tire squawks very noticeably.

snoopyrc

iTrader: (2)

Thank you for that much more detailed description that I was just too lazy to provide.

AMZ

iTrader: (6)

So as related to VTA, on most asphalt:

Diffs front and rear=neutral or even traction

Solid spool in front = more and sensitive steering

Oneway in front= most steering?

Please feel free to correct me if I am wrong.

FauxMako

My understanding:
Diff = wheels can turn at different speeds and provide braking
Spool = wheels turn at same speed and provide braking
Oneway = wheels turn at same speed and doesn't provide braking

BrodieMan

iTrader: (3)

Setup differences between TC & VTA with same chassis(JRXSR) on a carpet track??

Any advice would be appreciated.

Squarehead, do you have a carpet VTA setup for your JRXSR??

Thanks guys, looking forward to getting into VTA. An Inca Gold & Pearl White Javelin is going to look very 70's