gts 76 vs tc78
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Joined: Dec 2009
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From: corpus christi, texas
gts 76 vs tc78 what would you choose? I plan to run a stock 5.3 motor til I can build up my 6.0. I hope to get 650 out of the 5.3 and who knows what from the 6.0.
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From: Colorado Springs, Co/ Central, Ca
If you go the TC go with the 76mm. I had a TC76 vs the T78 and the TC76 ran just as good or better, and spooled quicker. That little 68mm exh wheel doesn't spinn that extra 2mm as well.
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I've ran tc76/gts76 back to back in my firebird and now the tc78 and billet 7675 in the rx7 and ltd. The tc definitely spools faster, but does give up some power, just depends on how much you want to make, if you want 700rwhp or less go with the tc, otherwise go with the precision.
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Skinnies, did you ever measure/record backpressure when using the tc78, thats my only concern with my setup(using the tc78 on 6.0L) i know the turbine wheel sucks, but im using a 1.15 housing and 3 1/2" downpipe with good exhaust to try help it breath a LITTLE better up top (only plan on revving to 6000rpms...)
With what you are trying to achieve the TC76 and proper A/R housing will easily do it. Spool faster then anything else as well.
The PT will be much better suited to the cubes of a built 6.0 than the TC. The TC will do 650 on a 5.3 no problem though. They're both good units honestly, but IMO, I'll happily give up a touch of spool for 100+ hp.
Skinnies, did you ever measure/record backpressure when using the tc78, thats my only concern with my setup(using the tc78 on 6.0L) i know the turbine wheel sucks, but im using a 1.15 housing and 3 1/2" downpipe with good exhaust to try help it breath a LITTLE better up top (only plan on revving to 6000rpms...)
I have the .96 housing and 3.5" DP and 3" exhaust. Mine spools nicely. I do plan on adding a 3.5" cut-out soon and a Eboost2 so I think those two mods will really help my spool time immensely.
WOW....that is a serious change...How did the dyno graph look? Was the peak level at a lower or higher RPM?
With these numbers, if $$$ was not a problem, why would one run the TC78?
I remember reading in Z28Cobra Killers thread for his buddy that the Twin TC78's they replaced with PTE76's were the exact same in physical size, but the turbine wheel is a 75 on the pte where as its a 68 on the tc78 which is where the extra power comes from and the billet wheel on the pte helps spool time and helps deflection at high boost. IIRC