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Forced Induction Forum
Discuss supercharging, turbocharging and even nitrous and water injection here.

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Old 09-15-2015, 12:31 AM   #1
lovemy330ci
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Join Date: Oct 2012
Location: NYC
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My Ride: 03 M3, VF570 StgII
seeing 12psi with vf kit @ 72 degree ambient air temps ?

tonight was one of the first cold nights ive driven my m3 in about a year, and by cold i mean relatively cold compared to what NYC has been like these past few months.

i normally dont redline my car but tonight i decided to push it a little harder since the air was more dense and cooler

close to redline lets say 7500+ i was seeing about 11-12 psi
now from what i understand my kit should only see 8.5-9 psi max!
i have VF 570 stage two kit, full supersprint race exhaust and a custom dyno tune from Frank Smith @ TTFS

im a bit puzzled as to why i am building way more boost than i should be seeing.. i dont really want to run any more than 10 psi on a stock engine with no internal upgrades

any input would be helpful, thanks
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Old 09-15-2015, 01:03 AM   #2
Davew
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Location: Melbourne, Australia
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My Ride: 2004 330ci Msport
I'm not familiar with the VF kit, but I believe it has a liquid intercooler in the intake manifold? On which side of this cooler are you reading boost? I see about a two psi difference from measurement pre cooler (16psi) and post cooler (14psi). I guess this would be the easiest first check maybe? Mine is an ESS TS kit, which also has in manifold liquid cooling.

Last edited by Davew; 09-15-2015 at 01:04 AM.
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Old 09-15-2015, 07:36 AM   #3
lovemy330ci
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From my understanding i am reading boost pre cooler,
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Old 09-15-2015, 07:37 AM   #4
lovemy330ci
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Why would your boost level drop post cooler if the air should be denser after being cooled?
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Old 09-15-2015, 02:24 PM   #5
kidrobot_
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Shouldn't be possible with a belt driven system. Probably something clogged along the intake/exhaust flow path. Check your cat converters.
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Old 09-16-2015, 12:01 PM   #6
lovemy330ci
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Cats are good, my back pressure is fine, wouldntt something clogging my system cause other issues, im not sure maybe my boost guage is defective?
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