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Boost Spike or Creep

Old 03-26-2006, 01:20 PM
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I have my Turbo XS MBC installed on the stock turbo, I havent ported the waste gate and I have it set so I can hit about 12lbs at peak in 3rd and 4th. I hit about 12 and then the gauge backs down and holds at 10, is this just a spike or creep and is it anything worth worrying about, I want the car to run 12 lbs and hold but I dont want to creep to 14 to get there. Should I port the stock wastegate? Seems to be more trouble then its worth since im not over boosting like 5-8lbs over where i want to be.



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Old 03-26-2006, 02:11 PM
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manual boost contollors do tend to have a little "spike" to them, is your controllor the type with a spring and ball bearing??
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Old 03-26-2006, 03:19 PM
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Is the one im using, its ball and spring, I dont know if it has the bleed hole to prevent wastegate lock up, I believe it does have a bleed hole....somewhere.
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Old 03-26-2006, 05:54 PM
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i ran that boost controler for a while, had the same problem,,,,, cept mine was the damn thing wouldnt alow me to boost under 19psi and would spike to 25psi then back down to 19psi . the only time it would spike was in first gear then it was ok after that.
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Old 04-17-2006, 09:28 PM
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yup what your having is spike..my friend had that in his 20g talon..he would get some spike too..after a while it turned to "creep" his 18psi setting he'd hit 21psi..needless to say the thing is no longer in his car.
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