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-   -   ECU/Stuttering Follow-Ups (http://legacygt.com/forums/showthread.php?t=16742)

smkscrn 08-08-2005 03:24 PM

ECU/Stuttering Follow-Ups
 
Post follow-ups to ECU issue/stuttering....since the other thread was closed.

dark_rex 08-08-2005 03:39 PM

Quote:

Originally Posted by smkscrn
Post follow-ups to ECU issue/stuttering....since the other thread was closed.

none of the other threads were closed...

why do we need 3 threads discussing the same issue open all at one time? isnt' two enough?

dR

smkscrn 08-08-2005 03:56 PM

^^
because I figured since MWIENER2 is starting a damn countdown to closing the other thread....as he said, that I would just open one that discusses the turnaround and results from LGT owners that have/are dealing with ECU issue.

*Jedimaster* 08-08-2005 04:08 PM

Good idea! The mods love it when you make another thread continuing one they intentionally closed!!!1

eles1 08-08-2005 04:26 PM

They're only closing it because it was getting way too lengthy to be useful. I already started another one with a poll in it (on down the list in this same forum) concerning how well the ECU fix worked for those who have tried it but it isn't getting much attention since the original one is still open.

dark_rex 08-08-2005 05:02 PM

Quote:

Originally Posted by jedimaster
Good idea! The mods love it when you make another thread continuing one they intentionally closed!!!1


:lol:

OCDetails 08-08-2005 05:03 PM

Has anyone tested to see if the minimal stutter that is left after the ECU fix has been applied will be removed after an AP reflash? I'm just curious since I've read that the AP sorts out the problem pretty well before the fix, so maybe it will do even better after the fix.

SBT 08-09-2005 01:23 AM

Two things for sure that I've noticed since my reflash (now at 850 miles post reflash)

1) The car is way smoother at idle and at just about any RPM range in any gear. Actually cannot induce stutter or buck.

2) My gas mileage has gone up at least 2 mpg around town and at least 3 mpg on the road. Definitely an added bonus.:)

SBT

cleansubaru 08-09-2005 02:25 AM

hi i like your info from all. this is my first add to any posts . i have a 97 legacy out and had 95 leg , both stuttered at 1800 -2500 rpm . does this co-realate ?
also it currently hums out of air box. any ideas? thanx

dark_rex 08-09-2005 09:00 AM

I had a conversation with KTR peroformance in MA yesterday, who has been flashing Subys with ECUtek for a couple years now.

He confirmed that most of the power they are extracting is not from simply increasing boost, then fuel accordingly. Instead, because that the car runs pig rich, particulary at WOT, they are primarily targeting leaner a/f ratios and adjusted timing tables.

where people are experiencing less severe "stuttering" after their aftermarket reflashes, I would suspect that some of the issue is related to the extra fuelling Subaru supplies in stock form. most of the graphs/data supplied here at LGT.com confirm this as well.

stock dyno run.
9.5:1 AFR from 3500rpms to redline.
http://www.legacygt.com/forums/atta...tachmentid=8578


final protuned dyno run
13:1 AFR falling to 11.5:1 at redline.
http://www.legacygt.com/forums/show...ght=dyno+charts

Stage I AFRs
about 2 points leaner again.
http://www.legacygt.com/forums/show...ght=dyno+charts

Dan at Mach IV
with his maps leaning out 2 pts to 11:1
http://www.legacygt.com/forums/show...yno+chart+graph

dR

SBT 08-09-2005 09:21 AM

Quote:

Originally Posted by cleansubaru
hi i like your info from all. this is my first add to any posts . i have a 97 legacy out and had 95 leg , both stuttered at 1800 -2500 rpm . does this co-realate ?
also it currently hums out of air box. any ideas? thanx

Your issues are likely different than the issues experienced by the 2005 Legacy GT and Outbacks Turbo motor owners for which there is a Subaru of America ECU reflash. That is the central topic in this thread.

Throttle body cleaning may help should resolve some of the stuttering your experiencing. Check this link...
http://forums.nasioc.com/forums/show...hreadid=375862

Also, the ground mod may also help with hesitation at the RPM range that you're experiencing problems. Here's another link... http://forums.nasioc.com/forums/showthread.php?t=183280

Believe you have the airbox (with filter inside) and a direct piece going from there to a torque box with a little stubby section sticking out of that airway between the filter box and the torque box. If so, and the initial part of the intake system (the plenum ahead of the filter box) has been removed, then the stubby is probably where you're getting the "hum" sound from.

Either re-install the initial intake piece (huge gob of plastic piping/boxes designed to reduce intake noise and smooth out the intake air turbulence) or replace the pipe (with stubby) between the filter box and the torque box with a direct pipe with no stubby. Air across the stubby (like blowing across the top of a bottle) is likely causing the hum.

If you are not setup like this, then check all of your piping connections between the filter box and the throttle body intake and use some carb cleaner spray along the length of your intake to see where the air leak is coming from. Just spray the carb cleaner on the intake and if the noise changes or the engine rpms increase/decrease, then you've located the leak. Also, check the carb cleaner on an out of the way spot first to ensure that it doesn't hurt the plastic on the intake.

Good luck!
SBT

NeedMoreBoost 08-09-2005 09:58 AM

Is there a reference number I can give to my local dealer so they know what I'm talking about? I heard a couple people are having a hard time getting their dealership to acknowledge there is a problem.

dark_rex 08-09-2005 12:14 PM

there is no TSB so far on this issue

cleansubaru 08-09-2005 08:33 PM

thanx ive done the ground, helped some . your right on about airbox. also i swapped out the egr transducer, that also helped. still kind of there. thank you.

mwiener2 08-09-2005 09:39 PM

I've now got over 1000 miles with the new programing. Still notice a difference...in a good way. Now that Subietonic mentions it.... i havn't noticed the grumbly idle anymore. Gas milage has gone down, but my floor it factor has gone up recently, so can't use that for anything. The car seems to get going from a stop much smoother as well.


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