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Old 01-03-2012, 02:22 AM   #5
NoDOHC
The quest for more torque
 
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Quote:
Originally Posted by RETed
The consensus seems to be that non-turbo 13B putting down close to 200hp at the wheels will shorten the life of the (FC) non-turbo transmissions.
200 at the wheels is typically 150 lb-ft at the wheels...
You're at this level right now...and then some.
So, with the non-turbo transmissions, it's no surprise you're killing them.
With the 4-port, I agree, but I killed two transmissions with a 6-port, barely clearing 100 WLb-Ft.
Quote:
Originally Posted by RETed
As for the turbo transmissions...
Hard to say...
Used units are not a very good baseline - same goes with the non-turbo transmissions.
To have good data, the transmissions need to be inspected and rebuilt.
Even a turbo trans with a problem area internally will let go quickly.
Did you tear down the turbo transmissions to verify it was the bearings / synchros that were damaged?
No, I should do that. I have some experience with ruining transmissions, the symptoms all pointed to bearings. I intend to rebuild this US spec transmission, as they are hard to come by these days.
Quote:
Originally Posted by RETed
I don't think you mention what kind of clutches you're using?
Unsprung, puck clutch disc can cause damage unless you're very good as synchronizing your shifting.
I have a sprung Spec Stage 3+ Clutch (major overkill - rated at 505 Lb-Ft). I have soaked it with ATF to get a reasonable launch, as the stock condition was way too grabby. However, it is relatively mild now.
Quote:
Originally Posted by RETed
Speaking of shifting...bad, slopping shifting can also damage transmission quickly.
Do you rev match often?
How about on the downshift?
I typically shift about 2,000 rpm and do so very gently. I will occasionally rev to 10,000 rpm in 1st gear and then go straight to 5th, but I let the clutch up in neutral as the engine is spinning down and then disengage it just to go for 5th when the tach drops below 2200 rpm. This is a daily driver and I don't want trouble with the police.
Bear in mind that the only synchro trouble that I have ever had was on the transmission that I drag raced with and the one that abruptly lost 5th gear synchros and reverse.
Quote:
Originally Posted by RETed
What kind of fluid are you running in them?
Mobile 1 75W90 Synthetic
Quote:
Originally Posted by RETed

-Ted
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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