low boost. stumped.
#1
low boost. stumped.
So I waa having some issues with stuttering under heavy load. So I replaced the serp belt and plugs. Also fixed a slight boost leak in the boots and after a year I switched out the vacuum line for the map sensor (attached image).
After fixing boost leak, map sensor line, and new plugs I was hitting peak boost (19lbs). However, after replacing serp belt I now can only get 16lbs of boost.
Not sure how this is possible. Anyone know why I would be getting less boost after putting on a new belt (napa 060532)?
After fixing boost leak, map sensor line, and new plugs I was hitting peak boost (19lbs). However, after replacing serp belt I now can only get 16lbs of boost.
Not sure how this is possible. Anyone know why I would be getting less boost after putting on a new belt (napa 060532)?
#6
Change the throttle body? If you did adaptations must be reset.
#7
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#9
So I installed the dt bpv and it only accentuated the stuttering issue. Except it feels more like a timing retard between 2700 and 3200 rpm. Also, I threw some codes after the intial startup. Have been having issues with misfiring this last week randomly on the highway.
Would a bad chain tensioner make the ecu retard timing between those rpm?
Im not sure if this is just one problem or multiple issues at this point :/
Would a bad chain tensioner make the ecu retard timing between those rpm?
Im not sure if this is just one problem or multiple issues at this point :/
#10
#12
That sounds awfully high for a 17% pulley. Are you using one of those electronic gauges that reads off of a MAP sensor?
My JCW makes 15psi of boost (autometer mechanical boost gauge) with a 17% pulley on it. To tell you the truth...I've never even heard of anyone making 19psi of boost with just a 17% pulley.
My JCW makes 15psi of boost (autometer mechanical boost gauge) with a 17% pulley on it. To tell you the truth...I've never even heard of anyone making 19psi of boost with just a 17% pulley.
#13
#16
+1
Sounds about right...maybe 2 psi higher than expected...but likely well within the accuracy of the guage...they can be pretty bad...
Remember, a "jcw" will show LESS BOOST WITH THE SAME PULLEY...this is due to porting...
My gut says you T-MAP is bad.....but just a guess.
How sure are you that cold side map sensor repair you did is leakfree? That picture you have makes me wonder.....
Sounds about right...maybe 2 psi higher than expected...but likely well within the accuracy of the guage...they can be pretty bad...
Remember, a "jcw" will show LESS BOOST WITH THE SAME PULLEY...this is due to porting...
My gut says you T-MAP is bad.....but just a guess.
How sure are you that cold side map sensor repair you did is leakfree? That picture you have makes me wonder.....
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kjd186
R56 :: Hatch Talk (2007+)
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09-09-2015 10:02 AM