RPM spike
09-11-2003, 01:08 AM
#1
Guest
Posts: n/a
RPM spike
Hi guys,
I'm new to subaru cars. I got a 2002 wrx wagon. the problem is
-- whenever i drive up to 3500-4000 rpm, i press on the clutch, try to shift, i notice that the rpm spike a bit , say gas to 3500 rpm, ease off the gas, press the clutch, rpm spike to 4000 rpm right after the clutch was depressed, i shift to the next gear.....
someone told me that it's because i have samco hoses and the boost goes back to the turbo so i don't lose too much boost throught the HKS SSQ BOV. Is that true? or my clutch is busted?
I got all sorta weird things with my wrx. Maybe it's because I drive a bmw before, and it's NA, it's smooth and luxury.
Another weird thing is -- my wrx sound like a Mustang V8. I have zerosport header, STi intake manifold, samco hoses, AEM CAI, HKS SSQ BOV, zero sport exhaust, etc....
Is this normal?? please help me out !
I'm new to subaru cars. I got a 2002 wrx wagon. the problem is
-- whenever i drive up to 3500-4000 rpm, i press on the clutch, try to shift, i notice that the rpm spike a bit , say gas to 3500 rpm, ease off the gas, press the clutch, rpm spike to 4000 rpm right after the clutch was depressed, i shift to the next gear.....
someone told me that it's because i have samco hoses and the boost goes back to the turbo so i don't lose too much boost throught the HKS SSQ BOV. Is that true? or my clutch is busted?
I got all sorta weird things with my wrx. Maybe it's because I drive a bmw before, and it's NA, it's smooth and luxury.
Another weird thing is -- my wrx sound like a Mustang V8. I have zerosport header, STi intake manifold, samco hoses, AEM CAI, HKS SSQ BOV, zero sport exhaust, etc....
Is this normal?? please help me out !
09-11-2003, 04:11 PM
#2
Registered User
Join Date: Nov 2002
Location: Bay Area
Posts: 1,402
Car Info: 02 WRX wagon=dead; rollin' in a Craptastic Camry!
It's normal for the rpm's to rise and for the H4 to have a sound similar (but not the same) as a V8.
You will learn to start rolling off the throttle and "unloading" the gear your in right before an upshift to avoid the rpm blip. It has been theorized that it is emissions programming that causes this. If fuel is still being sent to the combustion chamber, it gets burned rather than shot out the tail pipe. The same phenomenon has been reported a lot on the VW 1.8 turbo.
You will learn to start rolling off the throttle and "unloading" the gear your in right before an upshift to avoid the rpm blip. It has been theorized that it is emissions programming that causes this. If fuel is still being sent to the combustion chamber, it gets burned rather than shot out the tail pipe. The same phenomenon has been reported a lot on the VW 1.8 turbo.
09-12-2003, 02:24 AM
#4
Guest
Posts: n/a
Thanks sooooo much......
i thought theres something hooked up wrong with my samco hoses, cause the hose that ran from the AEM intake to the turbo inlet, and some of the branches were blocked off. And I thought it was installed incorrectly !
about the V8 sound, I thought it's that my valve was ticking or it's about the aftermarket header.
Thanks for clearing up my mind. Your help is greatly appreciated !
i thought theres something hooked up wrong with my samco hoses, cause the hose that ran from the AEM intake to the turbo inlet, and some of the branches were blocked off. And I thought it was installed incorrectly !
about the V8 sound, I thought it's that my valve was ticking or it's about the aftermarket header.
Thanks for clearing up my mind. Your help is greatly appreciated !
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