boost creep
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boost creep
Hey I'm fairly new to boost and have a bit of a problem. I have an evo 9 bc cams, valvetrain, 880 injectors and 255 Fp and is apparently tuned by previous owner. When I am stepping on it in the longer gears like 4th and 5th my boost slowly creeps up from 19psi to like 24psi and pops like I hit a wall. Only does it time to time. Can anyone shed some light on my problem? Thanks.
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The pop and wall you just is boost/fuel cut. Basically you have too much boost coming from the turbo so the engine cuts to stop you running lean and doing serious damage. Fuel cut from the factory I believe is 23 psi. Your gauge is probably reading a fraction high (mine does the same).
If it hasn't been tuned by someone with a lot of tuning experience, my recommendation is to get a proper tune from a shop. If you still have issues after that, then start looking at your hardware, wastegate and such. A tuner should be able to pick up on the reason for your creep.
If it hasn't been tuned by someone with a lot of tuning experience, my recommendation is to get a proper tune from a shop. If you still have issues after that, then start looking at your hardware, wastegate and such. A tuner should be able to pick up on the reason for your creep.
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#9
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How are you controlling boost incidentally? Sometimes if the weather is extremely cold this can account for about 3-4 PSI of over boost. Let's say that the previous owner tuned the car and set the boost during the warmer summer months and now you are driving it in the cold winter evening temps...this could exacerbate the problem.
Last edited by sparky; Mar 8, 2012 at 07:36 PM.
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