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Old 03-04-2003, 02:26 PM   #1
WRXVII
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2002 WRX
VF34'd...

Lightbulb WRX's most common problem .... way to remedy it?

Hesitation, jerky motion.... most noticeably in low gears.... what can be done to remedy WRX's most common/major problem beside ECU reset, ground mod, which seem to work only temporarily. Can WRX be driven as smooth as let's say Acura CL-S 6sp?
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Old 03-04-2003, 02:34 PM   #2
bugnutty
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vishnu ( or your favorite tuner ) REFLASH!
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Old 03-04-2003, 02:43 PM   #3
WRXVII
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any other way? something inexpensive?
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Old 03-04-2003, 02:51 PM   #4
Sperm
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$750 for 40hp and new found smoothness doesn't really seem expensive. But, I know what you mean.
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Old 03-04-2003, 02:54 PM   #5
WRXVII
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VF34'd...

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that's after core exchange I will buy it for $750 though....
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Old 03-04-2003, 02:55 PM   #6
kenchan
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ive read in the past that the catless uppipes provide smoother
response. but this is just hearsay.
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Old 03-04-2003, 03:33 PM   #7
Kitt
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2015 WRX STi

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My car runs smoother than ever now that there are no cats. An uppipe was the first thing I installed in my car and it seemed to have smoothed things out a bit on my mostly stock car. Maybe you should try a different brand of gas. I use Sunoco 94. Hope this helps
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Old 03-04-2003, 04:16 PM   #8
tdxflex
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WRB

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looking at your specs in your sig, an uppipe will help you out in terms of driveability. you using an mbc? a better boost controller would help also - but might as well go with engine management because it's really not that much more
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Old 03-04-2003, 04:30 PM   #9
KJR
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if the MBC/EBC is causing the problem, i would recommend the Vishnu EMI adapter. it smoothed out the low rpm lean condition "jerkiness" for me. also, if you are running higher than stock boost, a catless uppipe is always a good idea.
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Old 03-04-2003, 07:44 PM   #10
mesaro
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IIRC, I've heard lightened crank pulley's also help the jerkiness. Pls correct me if I'm wrong.
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Old 03-04-2003, 11:38 PM   #11
Bolster
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I usually notice jerkyness when the car isn't warmed. The only other times I get it is in the 60% throttle changeover from ECU to UTEC operation. In some situations when I'm trying to smoothly apply throttle and gradually increasing application it will make the changeover abruptly and kinda jerks the car. -Bolster
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Old 03-04-2003, 11:46 PM   #12
tdxflex
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Quote:
Originally posted by mesaro
IIRC, I've heard lightened crank pulley's also help the jerkiness. Pls correct me if I'm wrong.
it helps in 1st and 2nd gear, can't really feel a difference otherwise, but in his info he's got a pulley already
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Old 03-05-2003, 12:29 AM   #13
amelnikov
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STI tranny and motor mounts make the jerkiness much less. Because there is much less slop, the engine torque gets transfered into forward motion much more efficiently instead of engine slopping to a stop and then the car moving.

Alex...
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Old 03-05-2003, 12:31 AM   #14
WRblue'02
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I have an ECUTek reflash, an up-pipe and a pulley. I still get a "jerking motion."

Maybe it's just part of the character of the car, one of the comprimises that we make for this level of performance at $25K.

Just a guess...
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Old 03-05-2003, 12:40 AM   #15
WRXVII
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I also have a jerkiness in 1st and 2nd gear with lightened crank pulley. Anyone out there with a WRX that drives as smooth as let's say Lexus ES300?
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Old 03-05-2003, 01:29 AM   #16
KIMUTAKU
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the jerkyness is cool!!

nah...j/k...it pisses me off sometime and especially when there are passengers on my car...haha...they would think i can't drive..
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Old 03-05-2003, 02:21 AM   #17
lenyx
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Figured I add that I have the reflash as well and the jerkiness is still there... although not as bad as before when I had my unichip and avc-r controlling things.
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Old 03-05-2003, 10:19 AM   #18
xstar
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Quote:
Originally posted by amelnikov
STI tranny and motor mounts make the jerkiness much less. Because there is much less slop, the engine torque gets transfered into forward motion much more efficiently instead of engine slopping to a stop and then the car moving.

Alex...
I agree with Alex here. I installed the 3 mount pieces and 1st + 2nd gears are smoother/less jerkiness on quick gas pedal releases.

IMO, another way to minimize the jerkiness is just use your gas pedal more gently...
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Old 03-05-2003, 12:34 PM   #19
lstepnio
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werd! uppipe, downpipe, pulley, STi motor, tranny and pitch(useless) mounts. The mounts really make the car a pleasure to drive.

Quote:
Originally posted by xstar

I agree with Alex here. I installed the 3 mount pieces and 1st + 2nd gears are smoother/less jerkiness on quick gas pedal releases.

IMO, another way to minimize the jerkiness is just use your gas pedal more gently...
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