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Turbo 350
Posted: Thu Sep 10, 2009 6:28 pm
by hitchcock
Anyone out there know about how much power you can out through a th 350 with a T.C.I. performance rebuild kit. It has a jegs converter, manual valve body and about 500 hp.
Posted: Thu Sep 10, 2009 7:35 pm
by bigjoe1
I dont know about YOUR 350 trans, but I used to run turbo 350 !s with up to 750 HP, and they seemed to whold up pretty good, NOT with a trans brake though
JOE SHERMAN RACING
Posted: Thu Sep 10, 2009 7:55 pm
by hitchcock
So what does one need to live behind 500 hp in a 2900 pound car with no brake?
Posted: Thu Sep 10, 2009 8:11 pm
by automotive breath
The weak link on a T350 is the sprag, replacements available from places
like BTE. A good valve body and extra frictions in the clutch packs will
make it live longer.
Posted: Fri Sep 11, 2009 4:47 am
by redsmokin57
Was told many years ago to not do burnouts starting in first , with a manual valve body either top gear only, or second to top, helps turbo gearboxes live. And also what Automotive Breath and bigjoe1 said x2
Cheers Steve
Posted: Sat Sep 12, 2009 1:41 pm
by cb1
I am in the same situation. I have a street car, engine is dynoed at 580 but I might tune it down a bit for the street. I am un decided between turbo 350 or 400. I thought I would be stronger with the 400. CB
Posted: Sat Sep 12, 2009 2:36 pm
by bigjoe1
From my own experiance, a 350 is at least one full tenth quicker in the quarter mile than a 400. I woul;d pick the 350 everytime over the 400. It just wont last as long
JOE SHERMAN RACING
Posted: Sat Sep 12, 2009 3:16 pm
by Jason G
I ran a 6 cyl. TH350 (less clutches) with a quality rebuild and TransGo auto/manual shift kit. Put 200+ passes on it behind a 450-480 HP SBC before the 2nd gear sprag let go. 3600 lb car, which makes a difference as well.
Been running a TH350 with extra clutches, manual VB and BTE steel direct drum and 36-element sprag behind a 730 HP SBC. No other changes. Somewhere around 80 passes and a bunch of chassis dyno pulls on that combo.
Shooting for 850+ HP on the next engine and am upgrading to an aluminum fwd drum with 300M input shaft. Next freshen will likely get an aluminum direct drum as well.
There are two ways to go fast. Make more power or use a more efficient drivetrain or both.
My advice would be to use a VB that does not HAMMER the 1-2 shift. Nice and crisp and FAST, but not harsh. Combine that with hardened outer race should work well for a good while with the proper burnout procedure. The 36-element sprag/direct drum will for sure get it done.
Jason G.
Posted: Sat Sep 12, 2009 11:02 pm
by ERV JR
There are plenty ofcars inthe low 9's with th350 's @ around 3200lbs.There is another car that hasbeen 8's.
First tip is to do a high gear burn out, if you dont have the power then startin 2nd and click 3rd as soon asyou have wheel speed. he 36 element sprag is a choice you have to make as theyalso break. You can use a HD outter race and a factory type sprag.Leave the accmulator in for the 1-2 shift as this will help the trans out alot.also the wave plate for low gear. Use 5-5-3 clutch packs.
Another thing is a shitty cheap converter will come apart or cause alot of heat eiterof which will hurt the trans