Trans brake?

[Cool1]

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

High Performance Imports v8
Grey AE85 by C&Y Sports?
Watching it again it looks that it maybe a tricked up auto made to manual shift

[6BOOST]

The handbrake trick you are talking about is exactly what was said before, they are slipping the clutch, but to try and stop the car moving forward, they have their nad on teh handbrake to apply some force,, as their feet have one foot on teh clutch, and one the accelerator. If you are good at heel toe driving, you can actually use the accelerator, the foot brake, clutch AND handbrake, the extra force of the footbrake allows you to load the car up ever harder to start spooling the turbo.

Clutchless race transmissions do not have a torque converter as stated, but actually still have a clutch, you push it in to put it in first, or reverse, but you do not need to depress the clutch to change gears, basically like a dog box. This is the same be it liberty, G force, lenco, or any other race transmission.

A "transbrake, in an auto car, effectively locks the auto in first and reverse at the same time. As such, they fight each other, locking the box solid, and the engine is spoolimg up under teh load, kinda like if you have an auto and put your foot on the brake and accelerator at the same time, excpet that no matter how hard you push, the car doesn't move, as the box is actually locking it in place. When you release the button, it disengages reverse and shoots off the line with full power in first gear.

6BOOST

[Arnþór]

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.

That's stupid..
All good turbo setups have anti-lag....
it works by overlapping the timing so unburnt fuel goes into the exhaust manifold and detonates there thus giving all the boost needed while stepping the clutch

[oldcorollas]

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.

ahhhh　so it's les about spooling, and much much more about taking up drivetrain slack, so that when they go off the line, the slack has been taken up already, and the initial shock load is much smaller??

so... with a transbrake, do you bother taking up drivetrain slack (driveshaft and diff) before engaging the transbrake?

or do you use normal brake/handbrake when staging, and only apply transbrake at the start line (second stage).... so when you release off the line is actually more controlled by the transbrake release timing???

[chris davey]

That's stupid..
All good turbo setups have anti-lag....
it works by overlapping the timing so unburnt fuel goes into the exhaust manifold and detonates there thus giving all the boost needed while stepping the clutch

did you read what he said?

[thechuckster]

ahhhh?so it's les about spooling, and much much more about taking up drivetrain slack, so that when they go off the line, the slack has been taken up already, and the initial shock load is much smaller??

not really - you need load on the engine to spool up the turbo AND get pressure in the inlet manifold - otherwise, just revving the crap out of the engine with no load will get you high compressor speed but little manifold pressure.

Aim is to leave the line with revs up high and boost [b]already at a high level[b], otherwise you have to use the launch and 1st 60 feet of the track to build sizable boost.

Arnþór: i think you're talking about the anti-lag that you'll find in rally (and some track) cars. Anti lag will not get you boost off the line, it will however keep engine boost up while changing gears (like you do frequently in a rally car).

[WDE_BDY]

Arnþór: i think you're talking about the anti-lag that you'll find in rally (and some track) cars. Anti lag will not get you boost off the line, it will however keep engine boost up while changing gears (like you do frequently in a rally car).

It will get you exactly that, I've stood next to them while they launch and watched the boost guage. Expecially important is gravel hillclimbs where a lot of time can be lost on the start line.

Callum

[thechuckster]

It will get you exactly that, I've stood next to them while they launch and watched the boost guage. Expecially important is gravel hillclimbs where a lot of time can be lost on the start line.

Callum: you sure i wasn't launch control letting them build boost up?

i know some anti-lag systems can be tricked into providing boost off-the-line (holding then backing off on partial throttle), but some folk have launch control (WoT, clutch held at slip point, timing retarded and/or dropped cylinders, extra fuel added) & anti-lag (throttle rapidly closes and/or gets clutch-engaged signal, timing retarded and/or dropped cylinders, extra fuel added).

[ghost]

so... with a transbrake, do you bother taking up drivetrain slack (driveshaft and diff) before engaging the transbrake?

Taken from Hotrod.com link:

Brake torque engine to 2,000 rpm on the starting line before depressing the activation button. This builds pump pressure for full solenoid engagement to prevent vehicle creep and red light starts when the gas pedal is floored.

[WDE_BDY]

Chuckster, was definitely anti lag but I'm not talking top level rallying here. A couple of our club members cars are running it, you use a wind on cable (usually pinched from a diesel van) to hold trottle plate partly on all the time. brings idle up to around 2,500-3,000 rpm and switch on anti lag which causes the dropping of cylinders/spark/extra fuel etc. Builds boost real well but bloody noisy to stand next to. Will see if I can get a bit more info for you, but I'm taking a bit of break from running events at the moment so could be a few months.

Callum

[6BOOST]

Anti lag injects fuel out of sync with the timing events of the engine. It shoots the fuel in while the exhaust valve is open, which ignites in the pipes/manifold, and this heat/gas expands to create boost. Even harsher forms of anti lag fire the spark plug at the same time, so its virtually a combustion event while the exhaust valve is open, which creates huge pressure.

The heat associated with anti lag is extreem, and it chews up turbo's, manifolds, exhaust valves, and everything else in its path. Don't expect a very long life from your components if you use it often.

6BOOST

[ghost]

I Agree with 6Boost.
I would think antilag is only for those who desperately need to overcome serious lag issues for lauching at the strip or people serious about race/rally. You need to be willing to rebuild your turbo(s) at least within a relatively short period compared to a normally treated turbo. Unless you have money to burn, I suspect the gain is not worth it in the long run. Nitrous Oxide, in my opinion would serve the purpose better for encouraging early spool at the strip and keep both combustion and exhaust temps lower.

[oldcorollas]

you guys are talking about almost the same thing...
launch control is different to antilag. as chuckster mentioned.
one is for overcoming lag between gear changes, one is for building boost at the start line. different things..