auto box racing start
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auto box racing start
Hi all says it in the title realy just wondering what is the best way to do a racing start. I have a Bowler Tomcat with range rover ZF autobox. Can I rev it in neutral and slam in to gear or will this destroy the box?
Mick
Mick
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You need a trans brake for that don't you?
You put it in gear, engage the brake which locks the box up then rev the engine to the point where the torque converter is really biting but the brake is holding the the car stationary and when the lights change you release the brake and all hell breaks loose!
Slamming an auto box in gear whilst revving it would bugger it up surely?
You put it in gear, engage the brake which locks the box up then rev the engine to the point where the torque converter is really biting but the brake is holding the the car stationary and when the lights change you release the brake and all hell breaks loose!
Slamming an auto box in gear whilst revving it would bugger it up surely?
V8'less but a fountain of dorky knowledge ref v8's!
def dont slam it into gear.
As others have said, foot on the brake - give it some gas. Will need some practice to avoid bogging it.
Drag racers change to the torque convert to increase the 'stall' point. So they can launch at higer RPM. But on a 4x4 (like me) - the last thing you want is a high stall convertor - as the fluid will get very hot when going slowly.
As others have said, foot on the brake - give it some gas. Will need some practice to avoid bogging it.
Drag racers change to the torque convert to increase the 'stall' point. So they can launch at higer RPM. But on a 4x4 (like me) - the last thing you want is a high stall convertor - as the fluid will get very hot when going slowly.
As said before, dont stuff it into gear at high revs. I left foot the brake and hold the revs at 3000 on mine. I know my coverter has a 2800-3000rpm stall speed so thats what I go by.
Transbrake is the way to go for hard launches, but that brings its own set of problems with the drivetrain.
Do you know the stall speed of your converter?
You can experiment once you know this.
Transbrake is the way to go for hard launches, but that brings its own set of problems with the drivetrain.
Do you know the stall speed of your converter?
You can experiment once you know this.
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
re
DONT REV THE ZF IN NEAUTRAL AT ALL!!!! If you do a quick websearch,you will find heaps on how a design fault with the hp22 and hp24 boxes allows fluid to bypass in neautral and park which partially engages the clutch packs causing them to heat up and burn out.Even emisions testing in the US causes this on BMW's,volvo's RR's ect.It is the weak link with this box.For the type of use you are talkin about .better off with a TF727 or a chev t350,t400 or beefed t700.
Regards Doug
Regards Doug
In addition, jack the rear up of the car and run it through the gears, or drive it around to warm up the trans fluid, cold oil in an auto does nothing for the bands, it slips more and is far less consistant. And on the strip consistancy is the name of the game. Many racers get frustrated when dialing the car in the 60ft because they have not preped the car the same each time. Reving with the car in gear and your foot on the brake will cook the trans in a very short period.
Yes it's a Porsche and yes, it should sound like that!