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callum335i callum335i is offline
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Default Throttle not tracking pedal on S55 M4 - 10-12-2021, 01:24 AM

Any thoughts on what might be causing this? Pedal at 100%, but throttle maxing out at around 60%. Target boost is tiny at <5psi, but actual boost 11-18PSI. Car runs great, but has no top end. JB4 seems to be doing its thing in terms of additive boost, but I'll be turning it to map 4 until I figure this out...
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File Type: csv P4_M1_R4_211012_1804.csv (19.7 KB, 29 views)
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 10-12-2021, 08:24 AM

Do some longer higher RPM logs. boost = boost2 so throttle is open enough to allow full boost, which is what you'd expect considering how over sized it is.
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callum335i callum335i is offline
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Default 10-14-2021, 01:37 PM

Thanks for the reply Terry. Attached is a log through 3-4-5 with wider rev range. Unfortunately I kept losing traction around 5K rpm in each gear, which is the reason for dips. It was a straight dry road, but a bit bumpy...
I found the vacuum line in the cold air intake (next to the MAF) had come out (I can't have pushed it in all the way when I fitted the intake/filter setup), and it seems to have improved since. Throttle seems to be tracking RPM. Boost gaining steadily after a blip when you hit the power and peaking about 21-22. Does this look more like what you would expect? Should I be concerned about target boost being at <5PSI at all times?
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File Type: csv P4_M1_R3_211014_1814.csv (44.3 KB, 24 views)
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