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Drag Driveline?

czy18e

By czy18e,
in Motorsport Discussion & Builds

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czy18e Community Regular

czy18e

Posted
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Posted
probably worth a mention that with the rather large turbo you are running and depending on how

tight the converter is you will probably have to give the big girl a sniff to persuade it to come up on the brake. A small dry shot will do it, something like 50hp. Unless you want to be on the start line staaling it up while the other car crosses the finish line like most VLs you see

Its always possable but it wasnt too bad with the manual so the auto/stally/transbrake/2 step might be fine...

If im going nos ill go an even bigger turbo i reckon, or atleast just a larger hot side on the to4z...

BezerkR32 Veteran

BezerkR32

Posted
Posted

the manual is nohing like an auto, and if you are looking to up the turbine wheel and or housing, you will definately need it.

if your converter is loose you might get away with it but mph will suffer badly.

Its always possable but it wasnt too bad with the manual so the auto/stally/transbrake/2 step might be fine...

If im going nos ill go an even bigger turbo i reckon, or atleast just a larger hot side on the to4z...

  • 3 weeks later...
FATAZZ Grand Master

FATAZZ

Posted
Posted

Hi, i got a rb20det r32gtst auto with a re4r01a rebuilt box with 2500rpm stall.

Can i just 'add' a transbrake to my application?

do transbrakes run off how big your convertor is or is it completely seperate?

My goal is to be able to stall it up alot more then 2500 but does that mean i have to UP the convertor aswell to match the transbrake?

obviously im new to all this...

cheers

Aaron

2rismo Grand Master

2rismo

Posted
Posted
Hi, i got a rb20det r32gtst auto with a re4r01a rebuilt box with 2500rpm stall.

Can i just 'add' a transbrake to my application?

No. The transbrake is a part of the valvebody. If you don't already have one incoporated into your valvebody, you'll have to change this aspect of the transmission.

do transbrakes run off how big your convertor is or is it completely seperate?

How high the transbrake will stall is directly related to how big the stall of your converter is although their not usually the same. i.e. you may see higher rpm on the transbrake than you otherwise would on the footbrake.

My goal is to be able to stall it up alot more then 2500 but does that mean i have to UP the convertor aswell to match the transbrake?

Maybe, maybe not. You could have your box pulled apart and the valvebody replaced and see how you go rpm-wise but if you want to stall it much, much higher than the 2500rpm you're currently set up with, you will almost certainly have to change converter.

FATAZZ Grand Master

FATAZZ

Posted
Posted
No. The transbrake is a part of the valvebody. If you don't already have one incoporated into your valvebody, you'll have to change this aspect of the transmission.

It's still a standard auto valve body,will it need to be modified?

Completely.

How high the transbrake will stall is directly related to how big the stall of your converter is although their not usually the same. i.e. you may see higher rpm on the transbrake than you otherwise would on the footbrake.

so with current setup + adding a transbrake,i may if lucky be able to stall it to 3000rpm

Too hard to say as it relies on a great many other factors.

Maybe, maybe not. You could have your box pulled apart and the valvebody replaced and see how you go rpm-wise but if you want to stall it much, much higher than the 2500rpm you're currently set up with, you will almost certainly have to change converter.

Do they modify the stock auto valve body to incorporate the transbrake? Otherwise im looking at a bigger convertor to acheive the big transbrake.right?

The simplest way is to fit a higher RPM stall converter.

BezerkR32 Veteran

BezerkR32

Posted
Posted (edited)

for those that dont know how a transbrake works, in simple terms it engages reverse gear when first gear is selected. so you roll into stage in fist gear, engage T/B and then hold down micro-switch. reverse gear is then also engaged meaning that the transmission is trying to drive against itself. you then release the brake and apply the throttle firmly. boost can be built as there is obviously load as the transmission pushes against itself.

this is where the converter comes in. think of a loose or standard converter as a car with clutch slip. a loose converter will allow you to see alot of rpm while on the transbrake. this is good as it will come up quick, but it will behave like a car with clutch slip when you leave, giving you an average 60foot time and poor MPH overall. A tight converter is best but slower to see rpm and make boost. This is where Nos comes in.

Anyway you are on the gas at 4500rpm and 15psi. you release the microswitch which releases reverse gear and away you go. its like those toy cars that you drag backwards and then let go. the glove box flies open and shit goes every where and the front wheels are in the air for the fist 40 feet. cool.

post-20078-1211801208_thumb.jpg

Edited by BezerkR32

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