Trans brake?

[Cool1]

Ladies...and germs.

I was watching some import dvd earlier on and saw some fully filth automobile on the drag strip. At the start line they were pulling on a large handbrake leaver thingo and using this to load down the engine to spool up the turbo.
For now I want to know exactly how this thing works? Any facts?
ta

[Cool1]

Scratch that! Turns out one of the cars in the work shop has one fitted



Anyway, anyone here got one?

[Cool1]

Turns out the car in the shop is an auto.
I'm sure the car on the DVD I was watching was a manual!? Is it possible to have some kind of trans brake on a manual?

[oldcorollas]

in auto,

What Is a Trans Brake?

Available for most popular automatic transmission applications from companies like TCI for between $400 and $500, a trans-brake conversion consists of a few (reversible) case modifications and a specially modified valve body that's equipped with an electric solenoid. A driver-operated pushbutton triggers the solenoid to move a shuttle valve, causing the transmission's hydraulic circuitry to engage First and Reverse gears at the same time. If this sounds like a recipe for self-destruction, remember the car is not in motion when the activation button is depressed. With the transmission input-shaft effectively locked, the driver then mashes the accelerator pedal to the floor, giving the torque converter no option other than to slip until its absolute stall speed is reached. When the light turns green, the driver releases the activation button and the car explodes off the line. Once moving, the driver upshifts the transmission in the usual way.

http://www.hotrod.com/techarticles/d...13_0205_trans/

in manual? it's possible i suppose... but if it's turbo, it means you are stalling up against a slipping clutch may not be the best thing for it.....
perhaps it was a driveline brake to stop the driveshaft creeping the car forward?

how do manual turbos spool up effectively anyway?

[Cool1]

in auto,

http://www.hotrod.com/techarticles/d...13_0205_trans/

Yeah I read that. The car in this dvd didnt have an on/off switch! It was just like a handbrake lever! Maybe it just was the handbrake?

how do manual turbos spool up effectively anyway?

What you mean?

[oldcorollas]

i suppose similar could be if it was activating the actual handbrake, or a brake on the driveshaft or or... any number of possibilities..

well.. with auto and transbrake, you can load the engine up to spool the turbo.
with manual, unless you are slippign the clutch to load it up, you are just free-revving the engine..
(yah, i forgot about anti-lag/startline programming of fuel and spark .. never mind )

[Cool1]

In the G/Fs startlet you can rip on the handbrake and slip the clutch to spool up the turbo

[jeffro ra28]

The drag race GB's are a manual, but they have a torque converter. So you manually change gears, but the converter does the clutches job.

Im not to up to date with it all, but the $25,000 lenco gearbox at work has this sort of setup. So that kinda proves it possible in a manual, but its certainly not a normal one.

Im not exactly sure how it works at all, but i endevour to find out!

[oldcorollas]

Ladies...and germs.

I was watching some import dvd earlier on and saw some fully filth automobile on the drag strip. At the start line they were pulling on a large handbrake leaver thingo and using this to load down the engine to spool up the turbo.
For now I want to know exactly how this thing works? Any facts?
ta

any chance you could spot some distinguishing feature under the filth? perhaps there is detail around the net?

[feral4mr2]

the underground bogger's i operate have a trans brake, handy when you want full power to the hydraulics while still in gear (auto)..

[nihilism]

A transbrake basically locks up the auto transmission which means you can stall up the car so that the torque converter is slipping and thus providing load to the engine but you don't need to rely on your brakes to stop the car from moving forward. I guess if you fiited a manual with a torque conveter you could stall it up like an auto but would need to be on the brake (possibly handbrake) to stop the car from moving?

[Cruiser97_80]

the underground bogger's i operate have a trans brake, handy when you want full power to the hydraulics while still in gear (auto)..

the trans brake in a bogger actually neutralizes the tranny when you press it aswell as applying the wheel brakes

[WDE_BDY]

Wasn't a 4WD by any chance was it? The Heat Treatments Skyline over here in NZ has a handbrake type lever for locking and unlocking the centre diff hydraulically. Allowed them to heat the rear tyres only by disengaging the drive to the front.

Callum

[MS-75]

The handbrake is sometimes used by GTR drivers to bold the car still against the clutch, like stalling up an auto.

It allows the motor and drivetrain to be to be loaded up a bit so it makes a bit of power, but also greatly reduces the launching forces compared to side-stepping the clutch in a 4wd (bad, bad, bad for the drivetrain...).

When about to launch the revs are raised, the handbrake holds the car still and the clutch is slightly engaged for 1st gear. When the lights drop, the clutch quickly slipped out (depending how brutal the driver is...)and the handbrake is released simultaneosly.

Voila!!!!!! You're out of the hole and the drivetrain is still in one piece.

[feral4mr2]

the trans brake in a bogger actually neutralizes the tranny when you press it aswell as applying the wheel brakes

true, you can apply it without the brakes applying to if you wish.