FireDemonSiC

I was searching summit contemplating on replacing the jury rigged shifter a PO put in when I saw a push button T-Handle by B&M designed for their shifter which sparked my interest in line locks. I have a 700R4 (Built) in my car so I am not going to go to the trouble of fooling around with a trans brake. But I was wondering what the benefits of a linelock system is over a transbrake. I tried looking up videos of linelocks on youtube but only got a bunch of videos of morons using line locks to enhance their burnouts. Yeah, not trashing your rear brakes is great, but paying hundreds of $ to enhance something so useless as a burnout seems dumb. I did find one video on YouTube however where a guy hooked his linelock button up to his 6AL rev limiter, to limit the engine to the stall speed I am assuming. Or maybe I interprited that wrong. But seriously, what is the benefit of a line-lock system for launching over just normal compression braking?

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EvilCartman

Well, one plus was already covered but apparently it's only done by morons.

AlkyIROC

A fast drag car needs both.

A line lock allows you to only lock the front brakes for a burnout. You stop in the waterbox and step hard on the brakes. Push the line lock and release the brakes. As long as you're holding the line lock button, the front brakes still have pressure to hold the vehicle but the rear brakes are released. You do a burnout with no brake friction on the rear. Heating up brakes causes brake fade and I'd like the brakes to stop me at the end of the track shortly after a burnout.

A transbrake locks the transmission in first and reverse. This allows you to bring the engine launch rpm up to the converters stall speed for better launches. For best performance, the car should launch around the peak torque of the engine. When the transbrake is released, the fluid in the reverse circuit is dumped and the car launches violently.

A line lock, even if it's a 4 wheel line lock, will not hold the car on the starting line like a transbrake will. The vehicle's brakes can not hold back the engine torque trying to turn the wheels.

My converter stalls at 6000 rpm. I launch off the transbrake at 4500 but my vehicle brakes can only hold the car back to around 3000 rpm.

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FireDemonSiC

So in other words, there is no reason to install a line-lock on a street car?

AlkyIROC

It helps when you're showing off burning down your tires but a street car doesn't need a line lock or a transbrake.

Line lock is used to lock the front brakes to aid in a waterbox burnout.
Transbrake allows up to the converter's stall speed launches.

Cars with manual transmissions usually use the line lock to hold themselves on the starting line. With your foot on the clutch and the throttle, it's hard to keep the car from accidentally rolling through the beams if your foot is off the brake.

Here, watch this video. My line lock is mounted on the dash when this was shot. You can see me doing the burnout using the line lock. Just before I active the line lock, I'm pushing hard on the brakes. As soon as it's activated, I release the brake pedal which releases the rear brake pressure. Although you can't see me using the transbrake button on the steering wheel, you can see the results of using it by watching the tach.

http://members.streetfire.net/video/...008_168661.htm

50bmgshooter

not unless you have a stick and or need help doing a burn out
with a stick its a lot easier to do a burn out " power brake or brake stand "
with a line lock {hitting 2 pedals instead of 3 at the same time }
with a auto it helps BUT if you can feel when your rear breaks are starting to grab and can let back off enough then you shouldn't need them