- Thread starter
- #26
91gvr4gsr
Banned Member
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- Jan 11, 2009
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new york,
New_York
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The problem is not on the surface. Laser, REM ISF, etc do the surface ONLY. The problem is fatigue on the inside.
If your 4th broke that fast there was something else going on. Preloads, assembly, or something wasn't right. I have had cars with over 700hp run the EVOIII gears untreated with no issues until around the 10k mile mark.
Jack
Make sure you get a bunch of cores. You will be breaking them while learning. That's okay as you will get better as you go along. It's all part of the deal and could be fun!
Jack
Check out our gearset vs a Supra & you'll easily be able to see why we have issues....
Autos seem to be the way to go now when in the HP range the OP is looking at. I totally agree that you are going to break them eventually on a helical trans. It gets expensive running that kind of HP as things can break at any time, but that's just all part of racing IMO. That's true with just about any vehicle though and if you look at what us DSMers pay for parts it's a real bargain compared to what others pay for just a synchro. I remember back when I used to have to pay over $300 for one synchro when rebuilding a Getrag unit! Ouch!
Jack
I found these on a DsmTalk thread
The gears were never intended for high power. As said there are many improvements that can be made to improve the torque capabilities. I recently had to take my tranny apart to fix a broken 3rd fork and rail. It was surprisingly easy and I would not hesitate to buy a press and do a complete rebuild/improve if needed.
I did have a question and called the big three(shep,tre,jack) and Shep himself answered the phone after one ring. I have heard all of them do great work, but i'm just a stubborn bastard and insist on doing things myself I also don't have $2k spare to spend on a badass tranny
I just located a 2g awd I will be picking it up. Thanks for info[B said:Keltalon - [/B] In your circumstance, being a 2G FWD with a pretty decent torque number, I would likely run a 2G AWD transmission swap with a spool or welded center diff and VCE, the late 91-early 92 3/4 hub and slider/gearset assembly (Heavy Duty 3/4 upgrade), and an upgraded front differential (LSD insert or Quaife). The gears and shafts are actually quite a bit stronger than 1G/2G FWD Transmissions. I would also run equal-length axles (AWD driver-side halfshaft and axle), and solid motor mounts (aluminum front/rear, poly sides).
It is either this, or you build up your 2G FWD transmission (which will break sooner or later). I am not saying that the AWD transmission is going to be the last one you install, but it will be the best one in the circumstance that you are FWD and need a beefier transmission than stock.
If this is true, why do people even spend 2 and 3 thousand dollars rebuilding their trannies? Why not just buy 4 or five used units and put them in when one of them break? I can get 5 used fwd trannies for 550.00 each. Will a built fwd tranny break eventually with over 500hp and if so why? It does not have the gear stress that a awd unit have! If so then I guess if you really need a tranny that will last for a good while and your car is fwd the route to go is shep dogbox awd and vce right?. I just broke my tranny, I knew it would happen with 470 ft lbs tq I am trying to figure which way to go at this point
Yeah i have some minor problems with my trans and i'm about to do a rebuild to about 400hp so i'd like something thats going to last, but if i'm only going to get an extra 3k out of a built trans, its just not worth it, i'd rather hit up Junkyards and get spares. I know (jack, since your one of the big three that is actually on these forums) that this is your business and all of this stuff does help the longevity of the trans, but for someone on a budget, is it really worth it?
twicks69, what was it about the welded center diff that you didn't like? There isn' t really a large dsm community around my area so i haven't gotten a chance to drive different setups to know for myself. You seem very knowledgeable so your opinion, I think, would be worth something. Thanks!