eles1

Actually, you can also control your A/F ratio on a carbureted engine, you just have to re-jet the carburetor. It is true that you can't do it electronically like you can in an EFI equipped car. You'll also get more fluctuation in your A/F ratio since the system can't monitor and make real-time adjustments.

Ummmm. I think you're confused. Typically when increasing boost, tuners will alter the fuel tables to add more fuel to specifically avoid a lean condition. A/F ratio and boost target tables can be controlled and manipulated independently from each other. If you were silly enough to increase boost without also increasing fuel delivery, the engine would, in fact, run lean... At least for a few minutes before your pistons burn. Back on topic: Sounds like we've had a couple of semi-success stories with this "fix". Anyone else had any luck with it??

How many miles have you put on since the "fix". Simply resetting the ECU seems to make it better for a little while on mine but then it comes back. Please let us know if it gets worse again as you put more miles on.

+1 I've said all along that mine didn't start surging until summer rolled around. Hot weather makes it bad, hot weather + AC on makes it worse. It's barely noticeable in sub 80° temps.

The increased power comes from increasing the boost, not changing the A/F ratio. Also, I have Cobb stage 1/91 and, while the stutter is improved, it's not gone completely.

WRX's do have a cat in the uppipe, at least throught the 2005 model year. STi's do not.

I didn't notice the stuttering on mine until the weather turned warmer (bought the car last spring). Even now, on cool evenings, it's less noticeable. Once it began stuttering on a regular basis, I noticed it immediately.

Anytime. Just PM me a few days ahead and we'll get together and compare notes. ...but only if you promise to spell my username correctly next time...

I've also read that Vishnu claimed to have been successful at eliminating the stutter completly, but I haven't heard of any first person testimonials (from LGT.com or otherwise), so I never investigated further. Cobb's stage 1 tuning makes it significantly better. I'm sure a talented tuner could get rid of it completely if that was their main focus..

+1

That's exactly what I was afraid of... Thanks for the info.

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If Cobb came out with a map that focused on getting rid of the stutter, I would be very interested in that. Even if it didn't put out as much power as their current stage 1 map, I think I'd go with it anyhow. As long as it was putting out at least factory power.

Thanks for the update.. I hate to sound pessimistic, but it will probably only get worse as the ECU re-learns. My stuttering is always better immediately following an ECU reset, but it always comes back within a couple hundred miles. On the bright side, I think your rough idle should go away as the ECU re-learns. That seems to be a side effect of an ECU reset that goes away over time.

I have an AP, and I plan on trying the dealer fix. The AP makes the stuttering a little better, but still doesn't get rid of it to my satisfaction. I'll be "divorcing" the AP before my car goes for any service. I'll decide if I want to reinstall the stage 1 programming afterwards.

BigBen, Did they pull your ECU and send it out, or just perform a reflash while still in the car? Just curious to see if the solution they gave you (which apparently didn't work) was the same as the one Opie bought to our attention with this thread. Has anyone had success with this new "fix" yet???

I got the same thing from my dealer when I mentioned it but that was before I got the info from this thread. Now that I know that SOA is aware, I'll be taking it back as soon as I can to try again.

Good info. I'm interested to see if anyone actually has success with this new "fix". Keep us posted...

It's much more noticeable when driving as opposed to riding along. Also, I didn't notice it myself throughout the first few weeks of ownership. It's subtle, but annoying...

This is great... Now I just have to get my dealership to "duplicate" the problem. We'll see how that goes.