Boost peaks and then falls off...NEED HELP
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Boost peaks and then falls off...NEED HELP I have had this problem ever since I put the turbo on. It will ramp up to where I want it at around 5K and then by 6500 is will have dropped 3#. For example yesterday I wanted to run 15# and it would ramp up to 15 at 5K and then by 6500 it would be at 12-13#. It does it on every boost setting.
I have a T76GTS on a 8.5" 383 (LS1). The boost controller is a HKS EVC. Cant find any boost leaks either.
Any help would be appreciated.
I have a T76GTS on a 8.5" 383 (LS1). The boost controller is a HKS EVC. Cant find any boost leaks either.
Any help would be appreciated.
Also, is it an on center exhaust housing?
And what wastegate?
It sounds like the boost controller is not compensating for the increased back pressure which acts on the wastegate valve...
Ryan K.
And what wastegate?
It sounds like the boost controller is not compensating for the increased back pressure which acts on the wastegate valve...
Ryan K.
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Check your settings on your boost controller and play with your gain. if it drops off at peak, add gain, if it spikes during building boost, lower the gain. Bottom line, check the manual and work it out in low boost. Also, check your limits, warning limits, etc.., they will come into play.
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i had something simular, it turned out that wastegate was too small, so in midrange it was wide open and still the boost was increasing, at higher rpm the wastegate was able to do it's work again because the turbo needed all the exhaust gasses it could get to supply the engine with sufficient air.....
