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Old 11-03-2004, 02:56 AM   #1
03twrx
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Default boost, no boost, more boost...***!!1!11

O.K. The other night on my way to work, I stoped and filled my tank up with gas. Mind you I ran it completely dry( but never stalled it) then filled it up. Anyway's, from the gas station I went to work. When I left work that night (car sat for 10 hours) I got into it pretty good. Now with my wrx, the turbo spools up around 3200-3400rpms and pulls to 7k at which point the rev limiter cuts you off. Well what was wierd was that at 3200-3400 the boost kicked in, pulled to maybe 4500rpms then stopped making power untill 5500rpms! ***. I figured maby water in the gas, but this happens all the time now. At the same rpms every time. ***!!1! If I had a boost gauge I could see if I'm loosing boost pressure, but stock wrx's lack factory boost gauges. Can anyone help? I don't think it could be the fuel pump or filter. Car has 30,000mi
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Old 11-03-2004, 12:24 PM   #2
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bump, need help.
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Old 11-03-2004, 12:44 PM   #3
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Bad tank of gas? Ran the car so low got all of that crap from the bottom of your gas tank that you shouldn't? Go try and fill up at another station with 91,92,93,94 what ever your highest grade is and see if that helps.
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Old 11-03-2004, 12:50 PM   #4
03twrx
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O.k. I'll do that. Also, I just got wind it could be the cluch slipping. We'll see.
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Old 11-03-2004, 01:02 PM   #5
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Clutch slip is when you'll notice your rpms rising without the car doing much. Put it in 3rd gear and stomp on it. If the rpm's shoot up and the car doesn't go anywhere, your clutch is likely toast... but from your description, I'm not sure that's your issue.
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Old 11-03-2004, 01:22 PM   #6
03twrx
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I really don't think its the cluch. This problem happend all of the sudden.
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Old 11-03-2004, 02:13 PM   #7
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Default gas troubles?

hopefully that's all it is...

maybe the ecu is pulling timing in that flat range of power to avoid knocking... add some toluene or race gas to the mix, reset your ecu, and start driving it like you mean it, if it doesn't pick back up in about 50 miles worth of mad gas pedal mashing... you might have bigger issues... Are you sure its spooling?

Does it have power, then loose it, then gain it again prior to redline, or just lose all power after certain rpm and never get it back?


if gets it, loses it, then gets it again before redline... that is strange.. sounds like ecu is backing the car off in that dead range.
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Old 11-03-2004, 04:11 PM   #8
ima5exyindo
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Quote:
Originally Posted by Eggas
Bad tank of gas? Ran the car so low got all of that crap from the bottom of your gas tank that you shouldn't? Go try and fill up at another station with 91,92,93,94 what ever your highest grade is and see if that helps.
Same thing happend to me with my car. Im runnin Cobb Stage 1 with a catback exhaust and one day after i filled up with gas the car would only pull to 5500 rpm and go nowhere after that. The car did not feel smooth at all, but after i ran that tank empty and filled up at another gas station the car seemed to pull like its regular self.
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Old 11-03-2004, 05:51 PM   #9
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FYI - if you need to see exactly what boost is, borrow someone's OBD-II scanner or delta dash -- you can read the ECU's "intake manifold pressure" signal in real time to calculate boost (though you need to back out ambient air pressure, say 14.7 lbs at sea level).
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Old 11-04-2004, 12:55 AM   #10
WRXRallyBlue
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Is the lag severe, or does it just kinda stop for a sec and then go again?
Reason I ask is cause the stock ecu mapping has got a bit of a flat spot between about 4500 and 5500 rpms and it can seem like you are losing boost for that second between the two points.
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Old 11-04-2004, 03:27 AM   #11
03twrx
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At 3200rpm the rpms climb like hell, then at 4500rpms it almost feels like theres no boost and the rpms climb slower then at 5500rpms it goes back to normal self. This may be a knock issue. Although, I have run 87 in it without this happening. Runs tits on 93. I think this may be the first time i've put 87 in it.
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Old 11-04-2004, 12:34 PM   #12
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it could be your boost solenoid...
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Old 11-05-2004, 03:16 AM   #13
03twrx
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Thanks everyone, at 1/4 tank of gas I filled it back up with 93 and all was good. Could have been a knowck problem I guess.
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