Johnv

So same problem with the cutout open ?
the 3" exhaust will def be killing some power.

All you can do is check hot and cold side for boost leaks, no luck there....
try a heavier spring.

SPRAYED 01

iTrader: (22)

Its a tad higher with the cut out open. So could this really be a back pressure issue? Its a good size turbo with a 1.32 ar, I thought I would have lower back pressure than last years tc78 with a .96 setup.

Johnv

I was thinking back pressure after the turbo not before.

But if its no better with cutout open not so sure...

try a heavier spring in the gate.

Grr

iTrader: (2)

ater running the comp on the supra vs a gt35r, we found that the turbo just required more drive pressure with the big housing and wheel. 10# spring would make 7 or so, 18# spring made 16, but a 25# spring made 32. The wheels are just big enough that with the large housing and 79 turbine it seems to spool quick, but just wont light off without a bump in airflow, or a higher drive pressure. once it gets going though it really goes over the top! start leaning on it and see what happens

SPRAYED 01

iTrader: (22)

That's so weird because if use the boost controller it will make 10 psi just as fast as the 6lbs going off the 8lb spring. So it can make the boost I just think the waste gate is opening to soon.

SPRAYED 01

iTrader: (22)

Ok so I have a tial 38mm not a 50mm. It has a 10lbs yellow spring in it. So that means last years setup was doing 8psi on a 10psi spring and this year its 6psi on a 10psi spring.

Could the spring have worn out? I ended up putting a red 11.6psi spring in and it felt alot stiffer and was shorter than the yellow.

I won't have a chance to test untill tomorow.

SPRAYED 01

iTrader: (22)

Tial said that a 38mm waste gate is way to small on that size engine and turbo setup.

Johnv

yes it is a bit small,
but i would have thought you would have been getting boost creep or overboosting from too smaller wastegate.