Jon@tre are you still rebuilding the 6speed? I don't see it on your site anymore.

 

I think one that is rated under 290ft.lb of torque. Obviously you want your clutch to start slipping before you hit the critical stress limit of the transmission, IMHO. Again I may be wrong but that is how I see it.

He does, its just hidden behind other pages. Kinda a PITA to find.

Thanks for dropping in and chiming in GEARS !!! Your input is always appreciated.

 

Working torque is the amount of torque that a transmission can deal with on a continual basis without failure during its designed service life.

 

I'd hope to see temps stay below 200*F. Where that probe is located the transmission receives a healthy bath of oil from the final drive gear.

 

Oh nice, so basically I am lighting a fuse on 4th gear everytime I go WOT in 4th with over 300wtq in the car.

Yay!

time to stockpile a 5spd in the garage..

 

And thus here is the problem posed to many of us. Obviously we aren't going to take our engines out to figure out what "working torque" it is producing but the next best thing we have is an AWD Dyno. Problem is drivetrain parasitic losses are not a static factor and keep changing, compound that with the problem all dynos do not read the same, Dynojet, Dynodynamics, Mustang ....

GEARS don't you mean the working torque is 390ft.lb (instead of 290ft.lb)? ... as per our conversation last time or am I mistaken about that?

 

From what I've gathered from the old timers that have been doing this stuff since 19-prohibition automotive gears fail roughly at 3 times their rated torque capacity and that you are on "barrowed time" anytime the torque value is over half of burst torque.

So...I'd try to use something that holds the power the engine actually makes instead of what the clutch can hold, or worse, the sum of the stored energy in the rotating assembly because the torque spike going into the transmission is going infinitely huge, OR, up to the limit of the clutch's torque capacity, OR, the sum of the stored energy in the rotating assembly.

Automotive transmission gears are subject to being abused by the operator more than anything with except to only the clutch and even that is of much debate ever since those two met.

 

Gawd I wish that was at the wheels but that's at the input shaft. Also being that the EVO has 2 hypoid gearsets I'd say drivetrain losses are probably in the range of 30% so there's something extra bragging room for everyone.

Time to go home.

 

GEARS I could've swore when last spoke on the phone, we came to the conclusion that the working torque was 390ft.lb on the input shaft before failure and fatigue set in. If it is 290ft.lb that is very close to what the engine is producing in stock form. All 05 EVO8s make 282ft.lb of torque from the factory, uncomfortably close to the 290ft.lb. I can't believe and AISIN would design a transimission with very little margin for safety. But what do I know ...

But then again it's not like that hasn't been done before, anyone remember the MazdaSpeed Protege' ....

Razorlab: Tick Tock! Tick Tock! ...

 

Sorry I'm a noob, but what does this mean? "He had issue with overheating that caused stiffness between 3rd & 4th gear."

 

War - I usually agree with you but on this point I have to disagree. "For those of us who actually use the car for its intended purpose." WTF! The cars intended purpose is as a street car, period! A high performance street car, but a street car nonetheless. You make it sound like what you do with your car has some higher calling...

 

390ft.lbs would be about the highest torque that I would want to load the 6 speed with, just a little over half of burst torque. 1st-3rd can handle quite a bit more but if you've seen a MazdaSpeed transmission apart then you know how dainty those gear teeth are in the higher gears and the 6 speed isn't that different. Again the clutch's torque capacity should be choosen wisely for the application.

 

Fastest MR in the 11 second? not one person running decent ET's the 6 speed? Do a search and get you information straight...hint: 9.8@141mph.

 

Whoa, show us this MR. The fastest known USMD 6spd MR has only hit 11.5 or so. The only ones in the 10s have switched to 5spds, and some of the faster ones in the 11s have 5spds, too. I haven't seen a USDM 6spd MR go 10s yet, much less 9s. Were you referring to some Australian or JDM one?

 

This whole situation just sucks plain and simple, wonder what I can get on a trade for a IX SE...hhhmmmmmmmm