i had a homemade (home depot) boost control i was using to set my 5 psi waste gate to 8-9ish. but lately its been only boosting to about 4-5 at full throttle. so i took off the boost control today just to test and bam . i get a full 8 psi on the dot steady boost every time. i guess when i cut and re welded my wastegate it just happened to modify it to 8 psi so i guess that boost control was killing me that whole time.. now i got so much more speed.

91 civic hatch, homemade turbo+ LS motor = 12 sec street car.

Thats odd. A boost controller can't cause the boost to be less than the wastegate setting. Only greater than.

Evo 8 - 12.3@113 circa 2009 (~330whp)
Now with BB Xona Rotor HTZ FP Red and ~450whp
2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.

1998 dodge avenger 4 cyl AT
Mods are:
Not enough

it worked for a few months well but i guess the spring inside it wasnt made to handle heat so it was failing causing low boost at full throttle. oh well . its way better now.

91 civic hatch, homemade turbo+ LS motor = 12 sec street car.

I wonder if that is what my turbo's problem is. When its really hot my car will do the same thing yours does at WOT. But when its cooler it boosts pretty steady. I have the profec B spec 2 hooked up, but I am not sure its all the profecs fault. This whole thing has me baffled. I'm glad you are getting steady boost though...must feel nice...I have not had the pleasure of feeling what a steady boost feels like. Mine flux's up and down like crazy!

--------------------


- 05 Subaru STi
- 97 eclipse gs (289whp w/ 276tq)

Originally posted by mcgyvr

Originally posted by CarbonFiberRST Thats odd. A boost controller can't cause the boost to be less than the wastegate setting. Only greater than.

it can if its homemade and done incorrectly

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

well anytime i could boost like half throttle and get a full 8 psi , but anytime i was WOT it would go to like 4-5 and not climb . it was the boost controller for me , now its fine.

91 civic hatch, homemade turbo+ LS motor = 12 sec street car.

thats what happens with mine. At about half throttle it will be full boost, but the full boost at half throttle doesn't even feel that its really pulling that hard. And if I give it full WOT then it jumps down and holds steady at about 4.5psi.

--------------------


- 05 Subaru STi
- 97 eclipse gs (289whp w/ 276tq)

try a new boost controller . it should help .

91 civic hatch, homemade turbo+ LS motor = 12 sec street car.

Evo 8 - 12.3@113 circa 2009 (~330whp)
Now with BB Xona Rotor HTZ FP Red and ~450whp
2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.