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Old 05-06-2003, 12:29 PM   #1
KINGSKY
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Default car bogs at 2500 rpm

i was wondering if any of u has a clue of what's going on. i have a GC8 w/ a WRX motor and tranny. when it hits 2500 rpm the car bogs. it feels like it will stall. it's like driving a stick for the 1st time.
after it passes 2700 rpm it's back to normal. any suggestions?
thankx.......



KINGSKY
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Old 05-06-2003, 07:22 PM   #2
RimRockaz
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what are your mods?

I had that experience when I first put in the BOV and LINK ECU. After getting rid of the BOV and tune the ECU, the car runs fine..
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Old 05-07-2003, 12:53 PM   #3
KINGSKY
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all i have is a jun flywheel, upgraded clutch, samco IC hoses, jic xhaust. i think the problem is in ECU. i also have a CEL, with the error code of MISFIRE on all cylinders. thankx 4 the info.......


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Old 05-07-2003, 01:12 PM   #4
Shag-e
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Sounds like bad gas..... Is this common or something new?
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Old 05-07-2003, 01:57 PM   #5
KINGSKY
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it's not the gas. my car recently had the swap done and it hesitated right off the bat.


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Old 05-07-2003, 02:03 PM   #6
Shag-e
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Well, I had a similar problem when I had my WRX, but it was bad till i hit 5K rpm. It was deduced down to bad grounding on the engine. Added bigger wiring and the problem went away.

Its worth a shot and it doesn't cost that much to fix.

Search under grounding mod to find out what I am talking about.
Hopefully that helps
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Old 05-07-2003, 07:00 PM   #7
RimRockaz
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Quote:
Originally posted by KINGSKY
all i have is a jun flywheel, upgraded clutch, samco IC hoses, jic xhaust. i think the problem is in ECU. i also have a CEL, with the error code of MISFIRE on all cylinders. thankx 4 the info.......


KINGSKY
ok..since you have CEL w/ the error code of Misfire on all cylinders, maybe you should check or change the sparkplugs. A colder heat range of sparkplugs will probably help if the stock ones have gone bad.

Take care!
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Old 05-08-2003, 01:22 PM   #8
Coati
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It's quite possible that the CEL is due to the JUN being very light (is is the lightweight or the ultralight?). This confuses the ECU, but there is no real misfire. This happened when I had a JUN in my WRX. For all I know, you have my old flywheel.
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Old 05-13-2003, 07:19 PM   #9
luvmyrs
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one of the Tri-State members over here just did the same swap, he had some of the same symptoms as you. What it eventually came down to was a bad ECU. Try to see if someone local is willing to let you test with theyre ECU. If you wanna see the whole saga do a search on the username "Nizz". Goodluck with your project.
Frank
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Old 05-14-2003, 09:36 AM   #10
Puckaveli
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What is your boost gauge showing at the time of the bog? Some VW's will actually boost faster than the ECU can keep up. The boost will surge then the ECU turns it back for a second. I doubt that's it but who knows.
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Old 05-14-2003, 05:07 PM   #11
stimpy
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Sounds kind of like the wiring may be suspect. I'd try to confirm the wiring first. If that looks ok, then see if you can borrow an ECU from somebody else and see if that is bad. I've also heard of a misfire being thrown due to a lightweight flywheel, but I haven't heard about it having adverse affects.

Did you do the swap or did you pay somebody to do it?

-Jon
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Old 05-17-2003, 10:00 PM   #12
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problem solved. changed the rear diff and changed out the whole tranny. no more CEL, no more hesitation. hey andrew, thankx dude...


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Old 05-18-2003, 05:16 AM   #13
STi-Nismo Dood
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how did the tranny make you pull CELs?
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Old 05-18-2003, 08:23 PM   #14
KINGSKY
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i had a JUN ultralight flywheel, i guess that's the cause.
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Old 05-19-2003, 01:07 PM   #15
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So are you still running the ultralight flywheel? It sounds odd that if you replaced the tranny/rear diff and kept the FW then your CEL was being caused by something other than the FW.

-Jon
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Old 05-19-2003, 04:20 PM   #16
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stock clutch/flywheel are being used.... no more JUN.
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Old 05-19-2003, 04:46 PM   #17
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Ah, ok. That makes sense then. Was this the 9lb flywheel or the 12lb flywheel? This is actually one of the mods I was seriously considering for my swap (the 12lb flywheel that is).

In a different post in the FFI forum, a vendor mentioned that they had to actually raise the idle rpm by a few hundred to resolve the issue. What was happening was the decel was happening too fast for the IAC valve to catch it properly. Stumbling was supposed to be one of the byproducts of this.

-Jon

Last edited by stimpy; 05-19-2003 at 06:08 PM.
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Old 05-19-2003, 07:07 PM   #18
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Is this for real?

I had an 11lb unorthodox racing flywheel in my 2.5RS and never had a problem.

Now that it's an STi V, there's a JUN ultralight in there. I don't have a stock ecu but I don't have any idle problems either...
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Old 05-19-2003, 07:11 PM   #19
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I hadn't heard of it on anything before recently. I know of a WRX and an RS using the 12lb JUN flywheels without a problem. If you remember the fellow on here by the name of efoo, well his Tec 2 couldn't handle his lightweight flywheel and the car would die due to the IAC not catching it quick enough. That is the only other time I can remember a problem.

I have heard of lightweight underdrive pulleys throwing misfire codes due to the lack of the balancer though. Could it be that the flywheel was causing misfire codes due to an imperfection in it? Just throwing out ideas here...

-Jon
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Old 05-20-2003, 04:15 AM   #20
STi-Nismo Dood
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my friend once told me that Sports Compact Car did an article on a stock pulley v. the Unorthodox pulley and found that the harmonic balancer did as well as the stock's through their tests... dunno what kind of car though.
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Old 05-20-2003, 06:43 PM   #21
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I've heard conflicting opinions on that. There are many proponants of the stock harmonic dampener on inline fours. However, the flat four is very well balanced. Last time I checked, Trey Cobb and Christian ( Modern Garage) both were against the underdrive pulleys. Shiv used to be against them but after about 2 years, he started selling his own version.

-Jon
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