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Rich Druash · 06-29-2005, 12:51 PM

I was wondering if anyone knows what the wastegate is supposed to be set on on the s15 t28.I just installed a brand new s15 daul bb t28 on my s13 motor. I have stock injectors, ecu, and maf with a frontmount and a walboro 255 fuel pump. I had my car with the stock t25 running 12 lbs and it ran fine, I just unpgraded to the t28 and my car all the sudden wanted to boost all the way to 1.5 bar,(over 20lbs) and it would get there by 4000 rpms, it would probobly go even higher if i reved it all the way out. I tried bypassing the boost controller to try to isolate the problem and running the vacuume line directly to the wastegate actuator and i was boosting between 12 and 13 pounds. Does this seem unusual at all. With stock fuel the car is not runing right on 13 pounds, it feels like it's missing or back firing or something, I was guessing my injectors were passed dutycycle and the fuel cuting out. I was trying to run the t28 on less boost instead of the t25 on high boost until I could afford an enthalpy ecu and 550 injectors but now can't get it to boost any lower. Could my wastegate actuator be to tight or something.

06-29-2005, 12:51 PM	#1
Rich Druash Leaky Injector Join Date: Mar 2005 Location: Virginia Posts: 52 Trader Rating: (0)	newt28,won't go under 13psi, I was wondering if anyone knows what the wastegate is supposed to be set on on the s15 t28.I just installed a brand new s15 daul bb t28 on my s13 motor. I have stock injectors, ecu, and maf with a frontmount and a walboro 255 fuel pump. I had my car with the stock t25 running 12 lbs and it ran fine, I just unpgraded to the t28 and my car all the sudden wanted to boost all the way to 1.5 bar,(over 20lbs) and it would get there by 4000 rpms, it would probobly go even higher if i reved it all the way out. I tried bypassing the boost controller to try to isolate the problem and running the vacuume line directly to the wastegate actuator and i was boosting between 12 and 13 pounds. Does this seem unusual at all. With stock fuel the car is not runing right on 13 pounds, it feels like it's missing or back firing or something, I was guessing my injectors were passed dutycycle and the fuel cuting out. I was trying to run the t28 on less boost instead of the t25 on high boost until I could afford an enthalpy ecu and 550 injectors but now can't get it to boost any lower. Could my wastegate actuator be to tight or something.