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Old 10-23-2020, 03:27 PM   #1
Join Date: Sep 2020
Default 740 turbo overboosting with 2.5" Sidepipe

I have a 1991 Volvo 740 Turbo Wagon. I have a boost gauge wired up and before installing the 2.5" exhaust with a flow fx muffler from the downpipe, I was running the factory 6-7 psi. Now I'm making about 11 psi and am fuel cutting under hard acceleration. I was expecting to make a few more psi but was not expecting this. Any tips would be helpful as I'm pretty new to this stuff.

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Old 10-23-2020, 04:47 PM   #2
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Join Date: Nov 2002
Location: California

It's not fuel cut at 11 psi.

It's probably a soggy intake hose sucking shut
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Old 10-27-2020, 11:46 PM   #3
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Join Date: Feb 2003
Location: Milpitas, CA

Do you have a gauge? With a short exhaust like that it is pretty common to get massive boost creep. You may need to port your wastegate. Had this happen on mine years ago with a 13C on my 740. Hit 30 psi boost...
88' 740 GLE Wagon - B230FT, T5 Trans, MSII-extra, G80, 3" T->T Exhaust
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My new project - 1990 740 SE Wagon
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