TC78 with a 38mm wastegate
02-21-2011, 01:53 PM
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TC78 with a 38mm wastegate I was wondering if anyone could guesstimate what the lowest PSI I might be able to run on a 38mm Tial wastegate with a TC 78? I may be working with a pretty tight area and wasn't sure how tough fitting a larger unit there is going to be.
02-21-2011, 05:46 PM
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When I ordered my TC78, they recommended a 44mm when I said I only wanted to run <10psi on the street. They said it might boost creep. That's what I used & I've had no problems. Just a tidbit of info that probably doesn't help you 
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03-05-2012, 11:16 AM
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Still 68mm wheel
No clue on back pressure but it could not have been good.
It pulled great at 18lbs but I never ran it at that.
I ran it at 9lbs and ran a 11.2@120 car was laying over really hard after the 330' after that I looked at the logs and my meth wasn't spraying and the car was overheating at the big end. I was slow by .5 in the 1/8th alone and missing 6-7mph.
Just took it off yesterday and ordered a S480 to put in.
04-20-2012, 08:19 AM
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You could run as low qas 4lbs with a tc78 and 38mm wastegate? I couldnt run lower than 8lbs with a turbonetics 62-1 and 38mm tial WG on 355ci. I just ordered a hurricane 78mm turbonetics (same as tc78) and was thinking ill def have to go atleast 44mm WG if i want to keep boost around 10lbs.
