I am trying to choose between a single T76GTS and a S 400 The motor is a 377 SBC my Hp Goal is around 6-700 Hp and a 10 sec time slip could I get some info on These two turbo's.

I also was looking for a wastegate and BOV.

And finally Dave at majestic will probably where I will be purchasing.

Here is the car N/A

 

Welcome to the site!

 

Thanks Robert , do you ever make it up to US 41 for SCC

 

I haven't in years. I don't get out much these days.
I seem to ALWAYS have someone elses stuff to work on.
Not all bad.....

I hope to see some racing this year.
If the weather holds out I think they are racing this weekend.

 

To answer your question. . . I know something about the 76GTS. Built 2 combo's so far with it. One was a blow-through carbureted 377 that made 930 fwhp and 1070 ft-lb at 18 psi. The other is on my personal car that's been between 363 and 388 cid and run 9.9 at 146 mph at 17 psi boost.

I think the S400 is a little bigger and slower spooling than the 76GTS, but I'm no expert on it.

Mike

 

if your only looking for 600 to 700 hp a single t 70 will be enough

 

That is true, but the exhaust side worries me with 377 cid. The T70 can supply enough air for that power level, but the exhaust backpressure will be very high. If he wants to go smaller, he can go with the PT70GTS since it has the same exhaust side as the 76GTS. However, I don't think there would be much difference in spool time and the 76 will allow room to grow.

Mike

 

Dave, how do the two compare dimensionally?

I know the T-76GTS is as follows:

4" air inlet
3" air outlet
76 mm compressor inducer

T4 turbine inlet
3" v-band turbine outlet
2.96" turbine exducer
3.2" turbine inducer

Mike

 

Thanks for the reply's
Can I change the clock position on the Exhaust side in relation to the Compressor side ?

 

From this, it looks like the 79 trim is equal or slightly less of a turbo than the 76GTS. It looks like the 84 trim is more capable than both. I've seen folks get right at 1000 rwhp with the 76GTS. Has this been done with the S400? One advantage of the 76GTS is the size, since it's really small for the power it produces. However, the S400 is so cheap and possibly slightly more capable, it's the way to go if you have room.

Mike

 

Quick79 and I are using the S400. Here is a link to his car and a video of a test run. Unfortunately he had some suspension problems but it built boost extremly fast as you can tell from the launch. I think this is a excellent turbo for the price and will definately achieve your goals. It is a large turbo so if room is a problem then you may want to go with the T4 - 76mm turbo instead of the S400.

 

i have an s400 on a 350, and it sppols pretty darn quick, i'm very happy with it, and the sevice that i got from dave when i bought it.i think you would love it on a 377.

 

Anyone tried the S400 on a 346 LS1 ?

 

im pretty surprised on the price of the s400.....

 

You do mean cheap I hope !

 

$565 is dirt cheap for a 1000hp capable brand new turbo, and i love mine.

 

Amen !

 

S400 Dave is refering to will make More than 1000 RWHP and is a much stronger turbo. We are actually getting away from selling Precision all together.

 

any particular reason?