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Old 09-27-2003, 03:45 PM
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TH400 power handling and RPM range

Hey guys -

I have a question for all you domestic guru's:

Right now I'm running a 6spd in my supra and it's just a ***** at the track -difficult to launch and tends to hurt parts on drag radials (like the rear i blew thur night) - should've never been on low profile drag radials...damn wheel hop.

The latest trend for drag supras is going with a custom TH400 setup - since no matter how much a toyota tranny is built...it WILL fail eventually and can be costly to rebuild.

There are few shops in the USA building these kits and selling them for $4600 - $5500 (tranny, TC, drive shaft, adaptors, manual valve body, etc, etc...) - OUCH right?

I found a guy in Virginia who built a TH400 kit (tranny, 4k stall, driveshaft, adaptor..etc) for the Supra and is looking to trade for my 6spd / clutch -

My question: The tranny he has is a TCI tranny (reverse manual valve body) with PI 4000 stall with all adaptors to fit the Supra. Granted, I still need to find out exactly which TCI 400 tranny he has...even though he is going to fully freshen the trans.

But how is the power handling of the TCI 400 trans?
Will the tranny be able to handle 8000rpm shifts?

Car weighs ~3500lbs and makes 621rwhp @ 18psi and over 800rwhp @ 30psi - all thru the 6spd of course.

Another shop in Maryland (MSP Performance) has no issues with ATI tranny's and runs 8.30's on his drag Supra...but this is TCI, not ATI However, he thinks the TCI would be great....

You all are the experts...any tips would be great.


I've been doing "searches" for the past 2 days here and found alot of good base info, the tranny seems VERY solid and many folks put 500hp thru it - just thought I'd ask about a bit more power and RPM range - not to mention the sudden power deliver a big turbo delivers vs. the linear power deliver of a nice BBC.

I suppose, worse case: the Tranny fails after a number of passes and over the Winter I replace with something like: http://www.fbperformance.com/transmi...turbo400ms.htm $1,000 for a new 1000hp handling TH400...not bad Maybe even less since I'd have a "donor" TH400?

Thanks,
Jay
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Old 09-27-2003, 08:42 PM
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The Turbo 400 holds LS 6 454 450 horse engines easy. They make 500 - 525 stock. They were underated by GM. Rodders installed Open Chamber heads, bored them .030 or more and balanced everything and were at 600 to 650 HP pretty easy........in a heavy 70 Chevelle.

Then they started shooting NOS on them.......750 to 800 HP on the bottle

No problems.........

I say GO FOR IT ! !




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Old 09-28-2003, 02:22 PM
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Cool

I've built T-400's for Federal Mogul blown alcohol funny cars.

The engine guys tell us 2200 - 2500 hp

This is a very serious T-400 with high amounts of special parts.

I had a 6-71 blown 468 bb chevy in a 69 Camaro in the 80's. On a Go-Power dyno the engine pegged the 1,000 hp needle.

The T-400 in the car held up well to my foot and 13 inch slicks.
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Old 09-28-2003, 04:51 PM
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Deuce & Crosley -

Thanks for the info, basically I wanted to hear from some "real" world users and racers, the 400 swap is still pretty new in the Supra world, and the few shops making kits charge an arm and a leg.

They sound pretty solid even in stock form - especially if they can handle a large nitrous shot and still make it.

My real concern was it taking pass after pass with 800 more HP going thru it and snapping off 8000 rpms shift.

Crosley - you build a mean 400 tranny - Obviously, I'll never need anything quite as stoudt the tranny behind a blown alky car - but I would like the tranny to at least make it thru an entire season or more before needing a full freshening.

If that means buying / building more than I'd need - so be it. Being new to domestics - I'm not sure what you (crosley) or any of the local places would charge for an extreme rebuild...but looking at this: http://www.fbperformance.com/transmi...turbo400ms.htm - 1000HP rated, for drag racing and the whole 9 yards is only $1000...cheap in the Supra world - I image a build of an existing tranny would be even less?

Thanks again guys! -stay tuned
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