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Old 11-01-2020, 12:44 PM   #2965
yamahaSHO
Scooby Specialist
 
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
Vehicle:
2005 STi EFR 6758
04 S2000 EFR 7064

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Quote:
Originally Posted by BURNING4ORCE View Post
Has anyone pressure tested the iwg wastegate on their turbos? Specifically the t25/v-band b1 efr turbos. I've installed the new re-designed turbosmart twin port internal wastegate actuator to test for leaks on the barb fittings etc. and the actual bracket holding the wastegate is moving/bending every time it actuates when pressure is applied. This is a design flaw. Metal bracket seems thick enough but it's still bending. This is probably the reason why we are having issues with boost control on these turbos with the iwg wastegates that borg warner supplies.
Do you have any video of this?


I don't have a B1 - T25 turbo anymore, but I do still have a 7064 on my S2000. I am interested in the new TurboSmart actuators after seeing them at PRI last year. I have a hard time holding boost past 8.5 PSI (spring is like 5 PSI), so I got a 4-port to swap in, plus looking at the new IWG. I'd like to hold 10 PSI flat on the S2000, as that's probably like 430whp and plenty for my track car.




That's just 10 PSI tapering to 8.5 PSI in the last 1k RPM. I'd like to hold that torque curve a little flatter. It took like 26 PSI to make this power on my STi, with a slightly smaller EFR.
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