GT45 turbine housing size December 12, 2020 04:08AM
would a 1.28 housing be too big for a 466 open rpm. Have about 100 psi exhaust pressure with a 1.15 and about 65-70 boost. Any help appreciated
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Re: GT45 turbine housing size December 12, 2020 04:36AM
Yes it would be to big. I'm guessing you have boost gauges and not a data logger. I was in your same shoes till I put a corsa on. your highest exhaust pressure is before you let the clutch all the way out and your high intake pressure is when the box tops out. So if you put a 128 on you will lose your drive pressure when the box tops out and get under the charger.
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Re: GT45 turbine housing size December 12, 2020 08:53AM
We do have a datalogger. Exhaust pressure stays between 90-100 with boost ranging from 65-70 to about 75 at the pan drop. Exhaust pressure does drop close to the boost after the pan drops. Only went under charger once but only because too much gear for the track.
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Re: GT45 turbine housing size December 12, 2020 11:35AM
I guess you could try it but if when the pan drops the pressure's get as close as they are in my opinion that's pretty good numbers.
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