got the car tuned, can't hold the boost
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Registered User
Joined: Apr 2003
Posts: 64
From: fremont ca
got the car tuned, can't hold the boost
hi all, just got a dynotuned by shiv for my VS stg2 wrx. the car put down 245 whp. shiv told me he could only get the boost up to 16.5 psi which seems lower than other stg wrx's, and the boost can't hold till redline. he said that the header I have ( gruppes v2 header) was the main reason that my car hits lower boost. he also mentioned my car got a better mid range torqe than others. why is that? the header gave me a better mid range and lose some top end? anyone have dyno'd stg2 with headers? what whp did you put out? can you guys post the dyno plot? I really want my car to have 17.5 psi and hold to the redline, so the car may make more power. anyway, big thank to shiv, my car is running much better and strong now
thanks
thanks
Originally posted by Daredevil
i have cobb stage 2.5 and i keep at 15.7 PSI til redline
i haev no idea how this helps
but im ****nidr nk drunk
i have cobb stage 2.5 and i keep at 15.7 PSI til redline
i haev no idea how this helps
but im ****nidr nk drunk
here is a dancing banana for you:banana:
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Posts: n/a
Headers tend to shift the torque curve more than add to it.
If they shift it towards the upper end you lose at the lower and vice versa. Not a hard fast rule, but in general.
Depending on the sizing of the primaries and the size, it's possible it could give you a nice midrange gain and a little less up top.
The fact that you're making the most power at a slightly lower boost is not necessarily a bad thing in my mind. Your power output is similar to other Stage 2 cars dynoed on that dyno, if lower only slightly. Plus you get a bump in the midrange.
Power is more than peak output.
If they shift it towards the upper end you lose at the lower and vice versa. Not a hard fast rule, but in general.
Depending on the sizing of the primaries and the size, it's possible it could give you a nice midrange gain and a little less up top.
The fact that you're making the most power at a slightly lower boost is not necessarily a bad thing in my mind. Your power output is similar to other Stage 2 cars dynoed on that dyno, if lower only slightly. Plus you get a bump in the midrange.
Power is more than peak output.
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From: Sacramento CA
Car Info: 02 Impreza WRX sedan
Yes, darkspeed's car may actually be quicker in acceleration than other Stage 2 cars without headers. It's all about the area under the curve...
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Thread Starter
Registered User
Joined: Apr 2003
Posts: 64
From: fremont ca
yes I really feel my car has a strong midrange acceleration and the car also pulls hard on top. the funny thing is my dyno plot shows my boost starts to drop at 4700 or 4800 rpm, but from reading the boost gauge, the car holds the boost till redline. maybe my boost gauge is not accurate . Shiv told me that my car is making same power with lower boost compared to other stg2 wrx's which means the car runs safer. I think I should be happy with this result .
Last edited by darkspeed; Nov 22, 2003 at 12:01 AM.
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Car Info: Evo X, 04 STI, 335i, Fit
I doubt the headers are effecting the ability of your car holding boost, we have seen them used on some fairly high HP cars (ESX locals can comment)
Mike
(510) 487-4447
www.mpjperformance.com
www.gb-motorsports.com
Mike
(510) 487-4447
www.mpjperformance.com
www.gb-motorsports.com
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