2.9 Losing boost...out of ideas - video inside

Sounds to me like the motor has a miss up top.

DSG2003Mach1 said:

terminators have a cable directly from pedal to TB, the computer cannot intervene

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Ahhhhh yes... I was incorrectly applying GT500 info. Thanks for setting me straight.

I'm interested to hear more about this, I just bought a 2.9

Soap said:

Don't need to remove filter, just look at the TPS counts on your datalog.

--Joe

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Yep or hold the pedal to the floor and see if you can open the blade more by hand


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hey, any update on this? I'm having similar issue with my 2.3L. Down on power, boost wont go over 15 or so. Zero change with smaller pulley.

Possible knock sensor pulling timing, dumping boost. Coolant is hot in reservoir. iAT? E85? I think it’s pushing 93 octane performance


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Four Door SVT said:

Possible knock sensor pulling timing, dumping boost. Coolant is hot in reservoir. iAT? E85? I think it’s pushing 93 octane performance


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These cars don't have knock sensors. And while high IAT's could cause a loss in performance, it won't cause a loss in boost. To be low on boost is a mechanical issue. Either a restriction or a leak.

I don't think I've seen anyone keep the stock boost bypass set up when they go to a bigger blower. I know mine is sitting on my work bench now. I'm referring to the solenoid thats controlled by the ECU.

Had a similar issue with a friends Whipple 3.4 Crusher setup. Throttle body wasn’t opening all the way because the cable would ride out of the cable cam on the throttle body itself. I ended up drilling a hole in the cam and using a cotter pin to keep the cable securely in the cam groove. Problem solved.