Im lost, NOBODYS talking about locking the converter in first gear? Stay on topic. Now about the trans brake...
Question: Allison TransBrake? Would you buy it?
- Thread starter Brayden
- Start date
What is the concern with a transbrake on an Allison. Is it due to the torque we produce? Just asking as the hard parts seem much beefier than that of other trans that utilize a brake..... If it's due to the massive amounts of torque I can see where that would be an issue.
Walking through brakes would be a reason for 2WD launch, but I thought there was talk of 1st gear being too low (blowing the tires off) and second was used to help keep traction (plus one less shift and defuel)...
Again I am no drag racer so take my thoughts for what they are worth (not much)
Walking through brakes would be a reason for 2WD launch, but I thought there was talk of 1st gear being too low (blowing the tires off) and second was used to help keep traction (plus one less shift and defuel)...
Again I am no drag racer so take my thoughts for what they are worth (not much)
The reason I would be worried about it is because when you are using a trans brake, there is no load on the drivetrain. The trans is holding back lots of power, and when you let it go with all the weight you are trying to move, when it takes up the driveline slack, it seems like there are lots of potential parts that would be just waiting to snap.
X2.
The lighter trucks might be able to pull it off, but the heavier high hp/torque trucks may just blow the diffs and drivelines up when they launch. 2nd gear launching using this and launching with the converter locked may help reduce the breakage, but I still think it would be too hard on drivetrain parts.
I for one think an old school line-lock on the brakes is a better way to go, but that's nowhere near the same thing as what we are talking about and I doubt it's legal.
I know that Joe had built one.. :hug: He was a sharp guy 
His used pipes and check valves....
Mine requires no valve body modifications Just custom electronics.
His used pipes and check valves.... Mine requires no valve body modifications
Just custom electronics.Brayden - You won't be the first to build a transbrake for the Allison. The late Joe Webb (Suncoast) developed and had one in Suncoast's Duramax shop truck back in 2004. Joe said it would be a trans-BREAK so he shelved the project.
I believe that a transbrake wouldn't be "legal" in some classes but wouldn't be illegal unless one got caught. Also there are safety requirements that SHOULD be met like shields, or trans blankets to contain possible debris. I personally believe the Allison might not be up to the task to perform with a transbrake for long.
Back on topic.. Not Locking the TCC in first.. Engaging the trans brake in 1st.
Yes you can lock a 6 speed allison in first
I've seen several sled pulling trucks over 800hp shock the driveline with a triple disc clutch dumped all at once and several allison equipped 900hp trucks that leave around 20-25psi in 3rd gear. If that's not enough to break one then a transbrake isn't going to do it IMO.
We'll definately see..
We'll definately see..
I think Joe was ahead of his time.. The Dmax community is ready for it now
You're talking about way back when 500hp was gettin it done... Man you're old
:rofl:
X2
We need to move forward and if we are worried about breaking stuff,then we are not going to move forward
If you are scared , Enjoy second place
I am just curious but what is to gain? I have not really raced my truck but from what i have read the guys with plenty of horsepower can launch hard enough to lose traction already so a harder launch is not really necessary right? Is it more control or an attempt to have no stress on the drivetrain prior to launching?
I am just curious but what is to gain? I have not really raced my truck but from what i have read the guys with plenty of horsepower can launch hard enough to lose traction already so a harder launch is not really necessary right? Is it more control or an attempt to have no stress on the drivetrain prior to launching?
There comes a time when simply blasting down the track gets old, regardless of the ET's. Also watching someone spool at the tree for 30 seconds after they've got the green looks bad after a while, even at a test and tune night.
If we really want to race these trucks in regular bracket shows, we need to get to the next level of suspension tuning and launch control to be competitive with the regular bracket race crowd. Remember, CONSISTENT R/T's and ET's are what we are after here.
A decent trans brake could be a good tool to realize the consistent part.
Or maybe I'll enjoy first place while all the trans breakers are fixing parts...X2
We need to move forward and if we are worried about breaking stuff,then we are not going to move forward
If you are scared , Enjoy second place
:rofl:After all, diesel racing seems to come down to a race of attrition rather than speed more often than not.
Some trucks will walk through the brakes even if you have tried to bend the brake pedal with your foot.
Especially with 1st gear launch, and tight converters, this can be an issue that a Transbrake could help.
But there is something cool about developing the skill to work around that issue. To get comfortable enough with your truck to stage quickly and reliably is probably the hardest thing to learn with the diesels.
However, if you want to WIN, eliminating things that can go wrong is a big plus. Even the most experienced racers will screw up the staging and launch. Seat time reduces it, but never eliminates it.
Especially with 1st gear launch, and tight converters, this can be an issue that a Transbrake could help.
But there is something cool about developing the skill to work around that issue. To get comfortable enough with your truck to stage quickly and reliably is probably the hardest thing to learn with the diesels.
However, if you want to WIN, eliminating things that can go wrong is a big plus. Even the most experienced racers will screw up the staging and launch. Seat time reduces it, but never eliminates it.
Or maybe I'll enjoy first place while all the trans breakers are fixing parts...
After all, diesel racing seems to come down to a race of attrition rather than speed more often than not.
At first you might win,But after the bugs get worked and appropiate parts are built, I will be consistent all day long and your truck will still be slow.:hello:
Dumping the that much force can be hard on parts. I am in the low 800s and did this Saturday.:thumb:
Look here. http://208.109.104.11/forum/attachment.php?attachmentid=11785&d=1254682199
I like trans brakes for drag racing. The help spool time a ton. The NX Mustang has one and spools almost instantly because of the increased load. Will it hold up in an Allison? Dont know. One way to find out!:baby:
I would do it in 2nd gear. 1st is worthless in a high HP truck.