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Old 10-30-2007, 08:53 PM   #1
subietumbler
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Default power loss

Just curious if anyone else has had a problem when accelerating past 4000 rpms if your car starts to act like it red lined. Everytime when I am accelerating past 4000 rpms my car feels like its hit a govenor and just bucks like crazy, then I shift to a higher gear and its fine until I hit 4000 rpms. I feels like if you were to unhook a hose or line going to the intercooler or something, not sure, I am totally lost any help would be greatly appreciated
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Old 10-30-2007, 09:05 PM   #2
gormonk
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possible overboost
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Old 10-30-2007, 09:06 PM   #3
M.Ehle
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No, That's not right at all. Once all the service guys see this thread they'll want to know what year, model and of course, what mods you have. List 'em now for their benefit. If you're still under warranty then just get it to one of our dealerships, N S E or W, just get it in. Good Luck Sir.
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Old 10-30-2007, 09:07 PM   #4
subietumbler
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is it possible to over boost on a stock turbo?
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Old 10-30-2007, 09:22 PM   #5
M.Ehle
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Possible, but still not right.
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Old 10-30-2007, 11:24 PM   #6
gormonk
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uhhh..... dude ive had this problem myself. AND i'm a tech.

but thats why i said "possible" overboost
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Old 10-30-2007, 11:25 PM   #7
subietumbler
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Well the car is an 02 wrx, not to many mods, just AER intake, GFB blow off valve, cat back exhaust, fidanza short throw shifter, tein lowering springs. The only thing that I can think of that would have any effect would be either the blow off valve tubing but thats all connected and no leaks, the other would be the mass air flow sensor might be failing but how would i check that aside from buying one and praying that it is it.
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Old 10-30-2007, 11:28 PM   #8
gormonk
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what codes is it throwing if any?
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Old 10-31-2007, 12:05 AM   #9
dubya05
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Anyone remember AZRALLY"S car doing this? Turbo inlet may have a tear in it...
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Old 10-31-2007, 12:21 AM   #10
02WRX06STI
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my dad's 02 is doing this same thing it is in stock form just has AP running stage 1 OTS map, and once he hits 14 lbs of boost, he get a sudden loss of power
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Old 10-31-2007, 04:36 AM   #11
treefrogaz
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Quote:
Originally Posted by dubya05 View Post
Anyone remember AZRALLY"S car doing this? Turbo inlet may have a tear in it...
Yes yes blackfalcons car was do it too
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Old 10-31-2007, 10:26 AM   #12
racingfish
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is it making any unusual noises under boost?
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Old 10-31-2007, 11:06 AM   #13
gormonk
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Quote:
Originally Posted by dubya05 View Post
Anyone remember AZRALLY"S car doing this? Turbo inlet may have a tear in it...
usually you can hear that once the car goes into boost
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Old 11-01-2007, 09:52 AM   #14
subietumbler
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no unusual noises at all, not throwing any codes just the power loss/sputering at 4000 rpms, I will check the inlet hose to the turbo and see if that may be it.
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Old 11-01-2007, 10:49 AM   #15
dubya05
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Quote:
Originally Posted by gormonk View Post
usually you can hear that once the car goes into boost
I drove the car and didn't hear anything.
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Old 11-01-2007, 11:32 AM   #16
gormonk
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check all your IC connectoins and your bpv as well. sounds to me like theres a possible boost leak somewhere
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Old 11-01-2007, 02:29 PM   #17
stimobetta
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Well if it feels like your hittin the govnor, its prolly overboostin.
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Old 11-01-2007, 04:07 PM   #18
subieyacht
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over boost will damn near shut the car down wont it? btw, do you have boost controller?
edit: if you are over boosting, You should have a C.E.L. as well

Last edited by subieyacht; 11-01-2007 at 04:13 PM.
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Old 11-01-2007, 04:36 PM   #19
Smoby
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Will it buck like crazy when you go over 4k no matter how much throttle? Be hard to overboost when only give it 30% throttle.

Have any check engine lights? Did you buy the car modded? I would see if you have any codes that are turned off. Good ol fashioned reset after that and see if you have the problem, if it doesnt come back right away then maybe you need tuned. You should be fine with those mods on an 02 tho. Do you have a stock intake? I would try that and see if you still have the problem. I have an extra if you need to borrow it. Do a boost leak test and see what comes up.

Where do you live? I can hook up my laptop and see wtf is going on. It wont be until Monday because I am going out of town today.
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Old 11-01-2007, 04:39 PM   #20
Black-Falcon
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Quote:
Originally Posted by treefrogaz View Post
Yes yes blackfalcons car was do it too
Yeah but mine didn't hit anything that felt like redline. Mine would just uncontrollably detonate at 3200 RPM, then be fine after that.
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Old 11-01-2007, 10:25 PM   #21
desmo750
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Take off your rad intake and revert to your stock air box.
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Old 11-01-2007, 10:30 PM   #22
whiteout06
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Quote:
Originally Posted by gormonk View Post
uhhh..... dude ive had this problem myself. AND i'm a tech.

haha then why cant you figure it out there MR. TECH
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Old 11-02-2007, 12:03 AM   #23
boosted20
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Maybe yer MAF has oil on it if you have an intake. But that wouldn't explain why it is fine until 4k. sounds like a boost control issue or a leak. probably a leak. yah der.

Last edited by boosted20; 11-02-2007 at 12:35 AM.
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Old 11-02-2007, 12:47 AM   #24
Kdub
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could be a major boost leak or you could be running wayyyyy lean. when my fpr went to **** i couldnt pass 4k because i was running so lean. check that and vacuum lines too.
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Old 11-02-2007, 01:54 PM   #25
SaabaruMike
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This is most likely something related to the MAF (bad MAF due to oiled filter or leak somewhere after), but I had this exact same issue on my old Porsche 924S and it turned out to be a loose ground cable bolt. I had a similar problem on my GN and it was also related to bad grounding. Just check your battery cables and ground connections. A good test is to take a set of jumper cables, connect one end to your negative battery terminal, and the other to the motor or the frame. Tuck it so you can close the hood and go for a drive. If the problem changes to a higher RPM or disappears, uoi found your issue.
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