Tc78 with 1.15 ar vs pt88?
12-20-2010, 09:41 AM
#1
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Tc78 with 1.15 ar vs pt88? I'm figuring out what turbo to go with and an idea I'm tossing around is keeping my tc 78 and putting a 1.15 ar housing on it. How does that compare to a pt88?
I'm running out of steam on the top end right now and want to up grade. Also the tc would still use a 3inch dp. Any one ever switch out the housing?
I'm running out of steam on the top end right now and want to up grade. Also the tc would still use a 3inch dp. Any one ever switch out the housing?
12-20-2010, 10:30 AM
#2
I have a coupe of guy that have made the switch. It all depends on what you are after. The PT88 will carry more power along with a fair amounbt of Lag. The 1.15 A/R will allow the TC78 to breathe better whick will free up some power, its not gonna produce the power of the PT88 though.
12-20-2010, 11:00 AM
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Forged 346 9.0:1 stock 241 heads ported,226/228 .600 115lsa,ls6 intake. A 1.25 ar would be nice. Im running 15psi and it chokes up around 5800. Great turbo though but im only at 133mph.
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12-20-2010, 11:03 AM
#8
Right now the 1.15 A/R is the larget for the TC series of turbos. After that stepping up to a Bigger turbo is your best bet. The Turbonetics TC series are great turbos for everything from Basic 500-600rwhp street cars all the way up to Mid 7 Second Race cars in Twin Applications.
12-20-2010, 11:12 AM
#10
FWIW i have a 370 with a l92 topend with a tc78 and 1.15
granted only running 8psi but i cant feel it roll over at all power wise up to 7k
I am looking to free up some flow too as i will be upping the boost and it spools almost too fast with the 1.15 and auto anyway
there was a 1.32 and 1.52 available at one time, but can't source one now
anyway, Justin at comp can fit up a 1.32 for a couple hundered bucks
Right now the 1.15 A/R is the larget for the TC series of turbos. After that stepping up to a Bigger turbo is your best bet. The Turbonetics TC series are great turbos for everything from Basic 500-600rwhp street cars all the way up to Mid 7 Second Race cars in Twin Applications.
12-20-2010, 11:14 AM
#11
like said above it is probably a better idea just to change turbos for a larger frame, but i really love the small build and weight of the TC 
I have been very curious if a turbo shop could swap the F1-68 for a GTS wheel and cut a housing to fit it? anyone know if that is possible? or does the GTS have a larger shaft?
I have been very curious if a turbo shop could swap the F1-68 for a GTS wheel and cut a housing to fit it? anyone know if that is possible? or does the GTS have a larger shaft?
12-20-2010, 11:20 AM
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I had the TC76 w/.96 ar on a 383, ported heads, 224/228 cam and the motor would fall over about 5k, wouldn't make more the 12lbs. Worked great on the stock motor not so much on the built one.
12-20-2010, 11:36 AM
#16
he had a TC78 with a .96 on a 383........ said it did roll over at 5k just like you say
went to a 1.32 and said it was a huge difference and would pull throughout
that is why i am hopeful/curious as to what a larger housing can accomplish
12-20-2010, 12:50 PM
#18
I think maybe the 3 in dp is too restrictive. Do some exhaust pressure tests before the turbine and also in the dp. You want as close to 0 in the dp as possible and no more than 2:1 preturbine. 2:1 being boost to exhaust ratio.
