Boost ok to taper even with bolt ons?
It's nice and warm (50f lol) so I went out and checked to see how the boost pattern was doing, i'm finding it makes 10psi to 4500, comes down to 8psi like it should, goes to ~11psi then after 6000 or so it comes down to ~8-9psi to redline, I think my last one acted like this too... only mods are apexi intakes/downpipe/greddy catback, stock cat in place
sound normal? i'm not using any methods of boost control other than stock |
I don't think it should drop off that much. How many miles on cat?
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Originally Posted by adam c
I don't think it should drop off that much. How many miles on cat?
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My car always did that with the stock cat until I got a boost controller, at which point it held 10 psi to redline.
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the dropoff to 8psi is normal
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^ Yep. Perfectly normal and how it's supposed to work.
Bone stock the boost pattern is 10-8-10 until about 6500 when it drops to 8 again. The ecu bleeds off a little boost at high rpm. You never hear it mentioned but in fact the stock boost pattern is 10-8-10-8. |
damn indecisive boost
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Mine did that too but it would drop around 5500-5800 rpm. It wasnt caused by exhaust restriction either... The stock ecu was consistantly dropping boost to exactly 8psi at those rpms. I patched into the wastegate control solenoid and monitored the pattern. Like rynberg, when I switched to a boost controller and took the solenoid out of the equation, the problem disapeared.
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