This guy who races his say I need a 2 step for my transbrake. It this true? Will a th400 hold for a few yrs with a transbrake?

 

I think your converter would benefit if you had a 2 step installed set a couple 100 below stall speed.

LAter <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

You dont NEED a 2 step for the transbrake to work properly. Arent you running a turbo. a 2-step would definately help you build boost off the line though so it's probably worth it to get one. As far as it holding up it probably will...just go with a good quality unit.

Will

 

I want to go with a yank.

 

I thought with a transbrake you would build boost to? The guy I know his transbrake will let him go to like any rpm. I thought a transbrake only goes up to what your convertor stalls to. That why I figured I could build full boost at the line. But if I need a 2 step to.......

 

A transbrake holds the transmission between 1st and reverse. When you let go of the activation switch, it slams into 1st gear. Without a 2 step, when you step on the gas it will go to any rpm you want (well it will go all the way to the your current rev limiter). It's like putting the clutch in on a M6. What a two step allows, is for you select what rpm you want to leave the line at and then a final rev limit. For example, lets say you select 3000rpm and 6200 rpm. When you engage the transbrake, you can push the gas to the floor and the rpm will not go over 3000. There are several different ways this can happen, but the most common way is to cut spark to cylinders. You don't want to have it held for a long period of time. It's just like bouncing off your 6200 rev limited, but the engine isn't working quite as hard. When you release the transbrake, the high rev limiter is activated and will limit maz rpm to 6200. Hope this helps.

 

Hey Cool,

Maybe there's some setups out there I haven't seen yet. I have a t350 with an ATI transbrake. Let me describe to you how mine works.

I pull up to the line, and activate the tbrake ( its controlled by a solenoid thats activated by a simple button switch ). When the solenoid is activated the t-brake engages 1st and reverse. When ready I stand on the accelerator , and try my best to cram it through the floorboard. The motor then revs up to my approximate stall speed on the converter. It doesn't go up to the rev limiter. When you release the button it relases reverse, and bam... you spin, you break, or you go. When selecting a converter you need to tell em you are gonna be using a t-brake, and what rpm you want it to stall at on the brake. Mine stalls around 4500 on the tbrake.

reasons for using a two step:

when using my technique described above, the rpm that the converter stalls too can be inconsistent, due to fluid levels, tranny temps etc. You can use a two step to set the engine rpm revlimiter temporarily so that on every run your launching off the exact same rpm to improve your consistency. But as in my case ( with a stall of 4500 on the brake ) if you were to set the two step limiter to say 5000 rpm, it would be like not using the two step , and the converter would still stall out around 4500 ( if that makes sense ), you basically use the two step to bring your limiter down below your stall speed of the converter.

I've also been told that when you do use a two step, and have it set below the stall of the converter, that you can get that extra smack out of the converter when you release the brake, and it flash stalls up to its limit, which can result in some harder launches. Haven't tested this yet but since my car seems to launch best around upper 4k off the brake....I'm thinking about raising my converter stall to 5000 or 5500rpm , installing a two step, and setting the two step to launch around 4500 - 4800 rpm.

Hope that helps, You might ask GeorgeC or BeaSSt they also run brakes. Email me if you have any other questions. You can also look at that video of my car I took from inside, you can see on the launch where it stalls at around 4800 on the brake.

Larry

 

Thanks everybody alot of good info in here. I better ask if mine will go to the stall speed or the rev limiter. Thanks again. If there anyother info I should know please feel free to tell me.

 

Oh PAin. Im getting it from yank and it comes with a race convertor. Getting the transbrake, 2.75 1st gear and the compelete install kit. I'll call him up monday to see about the transbrake thing.

 

Just out of curiosity, do you really want to be dumping unburnt fuel into your turbos? I dont know squat about turbos, but after seeing one of the videos of the flames coming out the back of a car on harlans two step, im not so sure that would be a good idea.

 

"Without a 2 step, when you step on the gas it will go to any rpm you want (well it will go all the way to the your current rev limiter)."

This is incorrect. It WILL NOT go to the rev limiter. This is impossible. It will go only to the true stall speed of the converter (which of course is nowhere near the stall speed of the converter.)

Ya'll please be careful with the false information. If you're not %100 just let someone else give the information. This forum is only as valuable as the accuracy of it's information. Thanks! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Ok let me ask you a question then. The guy I know his transbrake will go to the sky when he does it. Does that mean theres something wrong with his convertor or the transbrake? He pulls 1.5 60fts with a BB chevy motor in a 80s camaro.

 

"To the sky" still means no higher than his converter stalls. Sounds like he has a very loose stall.

For instance, my new engine is probably going to turn about 9000 RPM. The 2-step will probably be set around 6500. To the casual onlooker (onlistener?) it will seem to stall "to the sky" but still, it'll be a good 2500 RPM below the rev limiter and about 500 RPM lower than the stall speed.

If I disconneted the 2 step or set it higher than the stall speed, the engine would go to the stall speed (7000 is this example) on the brake.

<small>[ November 17, 2002, 03:45 PM: Message edited by: Colonel ]</small>

 

ah ok got ya