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09-07-2011, 01:39 PM | #1 |
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Figure this one out, Weird exhaust note change...
I am FBO with a Cobb AP Stage 1 Tune. I can be just cruising along and suddenly the exhaust note will change (get louder). The car does seem to accelerate a tiny bit as well (hardly noticeable).
Could this just be a fuel mapping issue with the tune, or perhaps the ECU is not getting the correct feedback from the O2 sensors in the downpipes even? I am out of ideas of what it may be. |
09-07-2011, 04:10 PM | #3 |
First Lieutenant
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Flap opens up at 1.1k RPM, so I don't think that's the case.
Maybe non even road? Little hill up or down will affect the boost. Kcc
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09-07-2011, 06:57 PM | #7 |
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Drives: 2008 135 blk, blk, step
Join Date: Jan 2009
Location: Atlanta, GA
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Garage List 1994 Porsche 968 Cab [0.00]
2017 AMG GTS [0.00] 1994 Porsche 968 Coupe [0.00] 1977 Mercedes 450SE ... [0.00] 2008 135 [8.00] |
Yup, the sound from my car varies pretty heavily. Most noticeable to me is how much louder it first idles when coming off a highway cruise.
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Injen, RR OCC, MadDad Whisper, donut spare, 19x8.5et43fr 19x9.5et45r Volk LE37's, rear fenders rolled/pulled, PSS4S 225/35fr 255/30r, KW V1's, AR coated catless dps, Cross strutbar, CF grills and license plate holder, iCarbon diffuser, ETS black anodized FMIC, M3 control arms, Quaife, ER chargepipe, ForgeDV's, Topspeed Custom Tune, V3sims, Braille, Andrey_GTA rear hub mod, Ebay Mstyle front bumper and performance style side skirts.
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09-08-2011, 11:43 AM | #8 |
Sic 'Em Bears
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Its def. the wastegate. Mine does this all the time at a 70mph cruise. I have strait pipes and it is super noticable. I'm so used to it that I don't pay attention to it anymore.
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