Burnout technique A999 trans

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Jax

Jax

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Hi,

I have a build A999 trans with trans brake and manual valve body. I just start racing the car a couple of months a go, and my burnt out technique was to stop in the water, start burnout in 1st gear, then after a couple of second shift into 2nd and when the tires start to create smoke I let the line lock go and slam the gas.

I was just reading an article somewhere else that it is prohibited to burnt out in 1st, but to start in second.
Apparently burnt out in 1st will damage the trans and can cause the sprag to break off and explode the trans?

Can you share some light here?
 
With a manual valve body start in second.
With my regular valve body I start in first then shift to second and roll out letting off.
 
This is the valve body I have. It is from JVX. It state that it does apply the low/reverse band in 1st gear.
Is it still mandatory to burn out in 2nd? Or is it more a question of recommendation in my case.

Screenshot_20181025-214948_Drive.jpg
 
never mind...............

904 based trans does not blow the front drum like a 727
 
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Start in 2nd , but, do NOT start burnout in waterbox , no way . Roll through the waterbox THEN start the burnout . Otherwise water will collect in the quarterpanels and drip down onto the tires during the run . Today's tracks are prepped much better than a decade ago . They have to do this . Some tracks are prepped differently for slicks or radials . Very little burnouts are needed these days , just enough to put heat in the tires . Hope this helps .
 
Jax said:
Hi,

I have a build A999 trans with trans brake and manual valve body. I just start racing the car a couple of months a go, and my burnt out technique was to stop in the water, start burnout in 1st gear, then after a couple of second shift into 2nd and when the tires start to create smoke I let the line lock go and slam the gas.

I was just reading an article somewhere else that it is prohibited to burnt out in 1st, but to start in second.
Apparently burnt out in 1st will damage the trans and can cause the sprag to break off and explode the trans?

Can you share some light here?
Click to expand...
Your trans will not explode, but you can certainly break the sprag doing but outs in 1st gear specifically because your valve body does not apply the band in 1st gear. Do your burn out in 2nd gear.
 
I have been racing 904s since 1993, with transbrakes...been starting burnout in 1st gear and shifting into 2nd gear before leaving water box. ..Never have had a problem...
After breaking a ring gear...8 3/4....I made about 5 more passes on that trans with a damaged sprag....after that it was making a lot of noise...since the 904 uses a bolt in spraq it was easy to fix the trans.
 
70aarcuda said:
I have been racing 904s since 1993, with transbrakes...been starting burnout in 1st gear and shifting into 2nd gear before leaving water box. ..Never have had a problem...
After breaking a ring gear...8 3/4....I made about 5 more passes on that trans with a damaged sprag....after that it was making a lot of noise...since the 904 uses a bolt in spraq it was easy to fix the trans.
Click to expand...
Not disagreeing with you Tony. But for every guy on this forum that tells me he has never had roller clutch trouble or that the 904 does not need that big dollar better roller clutch, I can find all kinds of racers who tell me they switched to a power glide because after they built there new stroker motor, they could not keep a sprag in the 904.
Talked to a guy at the Mopar meet in Norwalk this past summer who told me that. Everyone has different experiences.
The instructions that came with my turbo action converter tells me to burnout in 2nd gear. The instructions from Joe at transact were to do my burnout in 3rd gear. He says I have enough horsepower to do it and that not shifting through the gears is easier on the trans. Go figure.
John cope will not build a trans brake that does not put the low band on any time the trans is in first gear to protect the roller clutch.
Just sayin.
 
Jax said:
This is the valve body I have. It is from JVX. It state that it does apply the low/reverse band in 1st gear.
Is it still mandatory to burn out in 2nd? Or is it more a question of recommendation in my case.

View attachment 1715239958
Click to expand...
Just re read this and noticed you say it does apply the low band in first gear. You need to contact the company and verify that low band apply means only when the trans brake is on or any time the trans is in first gear.They are not the same thing. If it applies the band in first gear you can burnout in 1st safely. If it only applies the band when the trans brake is on then the recommendation is to burnout in 2nd.
 
I can only tell you from my experience what I do....no argument...

Out side of the damage sprag from breaking a ring gear....I have never had any sprag problems.....and they are all stock sprags....

Forgot...we twisted to 2 rear yokes of the stock driveshafts...I changed out the rollers and springs....a 5 dollar part.

Do what you want....
 
You can absolutely start the burnout in 1st (I used to all the time), just don't left off the gas until after you shift into 2nd, or 3rd....my 2 cents on the subject.
 
With the manual valve body there is no reason to start the burnout in first unless you dont have enough power to start spinning the tires in second or third.
 
Duane said:
Just re read this and noticed you say it does apply the low band in first gear. You need to contact the company and verify that low band apply means only when the trans brake is on or any time the trans is in first gear.They are not the same thing. If it applies the band in first gear you can burnout in 1st safely. If it only applies the band when the trans brake is on then the recommendation is to burnout in 2nd.
Click to expand...

I verified with JVX. The low band is applied all the time for safety reasons
 
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d55dave said:
With the manual valve body there is no reason to start the burnout in first unless you dont have enough power to start spinning the tires in second or third.
Click to expand...

My thought too. I was beginning to think nobody does high gear burnouts anymore..
 
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