boosting pressure - Subaru WRX Forum
 
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#1 Old 09-19-2010, 02:07 PM
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boosting pressure

my car is normally boosting 18 psi but when i put it to the floor the psi goes up to 18 then decreases to 10. not a big jump right to 10 but after a few seconds it does. any ideas?
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#2 Old 09-20-2010, 10:00 AM
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Normally I'd say that's just boost tapering off like it should, but that's a bit of a big taper... You could check for a boost leak, but also see what your tuner did to the boost and how he has it taper off.

I'm running 19psi peak, tapering to 14ish at redline for example.

-Chris
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#3 Old 09-20-2010, 10:03 AM
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35 tapering to 28

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#4 Old 09-20-2010, 10:33 AM
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Lol...just have to gloat don't you Matt.

24 tapering to 21.

Kirt
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#5 Old 09-20-2010, 12:57 PM
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On my previous car I had a road tune done and to heighten the feeling of more power the tuner spiked boost. So it felt great and hit boost high and quick, but then boost tapered severely because he had to pull timing after the spike. So it was a lousy tune but initial impressions were great.

18 to 10 is pretty severe though. What kind of tune does the car have?
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#6 Old 09-20-2010, 01:46 PM
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haha Kirt...I've got to gloat...my daily is 0 tapering to well 0

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#7 Old 09-20-2010, 01:56 PM
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What gear is the OP doing these pulls in?

Paul
2002 WRX Sold
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2007 STi totaled
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#8 Old 09-20-2010, 07:13 PM
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Quote:
Originally Posted by basco View Post
haha Kirt...I've got to gloat...my daily is 0 tapering to well 0
Haha, ok...you win. I just wanted to poke fun at you for gloating. OT

Kirt
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"When in doubt...flat out" - Colin McRae
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