is my stock wastegate actuator bad?

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Mar 29, 2007, 12:58 PM

#16

4TUN8

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Quote:

Originally Posted by MRevo2006

Just an FYI for future reference: 14.7:1 (air to fuel) is the ideal AFR, any number UNDER that is rich and any numbers above that are more lean.

Therefore you were getting richer at higher RPMS and boost--which is typical. Glad you got things sorted out though!

Just for future reference the 14.7 number only really matters with naturally aspirated cars sealed in a vacuum that has been medically decontaminated. A 12.0 AFR on the evo is considered lean, and 11.2-11.7 is normally the range that our cars are tuned to on pump gas.

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Evo2372 (Apr 29, 2018)

Feb 26, 2017, 08:00 AM

#17

greddy23

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I am in a similar position

Quote:

Originally Posted by Dapper Dan

think i found my problem......the vac line T i have under my center console was rotted out really bad........ so my gauge was reading off under boost......and the studdering was from over boosting.......good thing i didnt get on it much.......

I have a similar problem
my boost hitting 25 and studding as well
grimmspeed is on, setup good
wastegate was changed to Forge but since I started getting this spike I went back stock
I'll definitely check hose

what else can I check