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Old 02-26-2007, 01:57 AM   #1
pseudosport
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Default Just went stage 2, now car is jerky and I can hear flutter when it spools

Ok here is what I did to the car tonight.

catless uppipe
Mad Dad catless downpipe
Borla hush
stage 2 reflash (open ecu)

My problem is when I go to drive the car I can hear it spool up more but when it spools its not smooth. Just giving the car light throttle the spooling noise has a flutter. If i try and give the car more throttle the acceleration is jerky. It was 12:30 am when I finished but I tried to check for exhaust leaks and loose vacuum lines. So far I found nothing. Also I did not remove the intercooler during the install. Three weeks ago I just installed the same parts on my buddys 02 WRX and there have been no problems.
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Old 02-26-2007, 08:02 AM   #2
PrecisionPB
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Which map did you use when flashing? I've found a couple of the freebie maps to not provide very smooth power. Try paying a couple bucks for a decent map. A fella over on the OpenECU forums sells one for $25.00 that has provided very smooth power for me, both at Stg1.5 and Stg2.
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Old 02-26-2007, 08:56 AM   #3
REXtard04
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Stupid question, but after you did the re-flash, did you remember to disconnect the GREEN connector you need to hook up before the re-flash? Some people forget this needs to be done to take it out of "test mode".
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Old 02-26-2007, 10:34 AM   #4
pseudosport
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Yes the test connector is disconnected. I'm running the same map my friend is using. His car is very smooth.
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Old 02-26-2007, 10:41 AM   #5
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the free stage 2 map on osecurom site is great. also, wut he said^
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Old 02-26-2007, 12:35 PM   #6
MF-DIF
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This is normal to hear more fluttering. As far as it being jerky...are you refering to when boost comes on?

With OTS maps, power generally seems to come on as one big surge. Get custom tuned if this bothers you. The boost delievery can be smoothed out so it doesn't "kick" as much. Maybe you are not used to the response yet, you could be giving it too much throttle with the new power. Your friend might roll into the throttle lighter than you since he is used to this power level .
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Old 02-26-2007, 01:52 PM   #7
AlexGeez
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Check out this thread. See post #71. I did this on my old WRX with a TXS DP and it went away. The fluttering, at least...

http://forums.nasioc.com/forums/show...hlight=flutter
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Old 02-26-2007, 02:38 PM   #8
pseudosport
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I took the car on the highway to work this morning. It was snowing so with all the ice, road salt, sand, and the new exhaust it was difficult to hear anything. When cruising on the highway and lean into the throttle the acceleration is still not smooth. I have yet to give the car a lot of throttle and have not gone over 3000 rpms. When i drive my friends car it feels nothing like this. Could this be cause by a boost leak?
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Old 02-26-2007, 03:47 PM   #9
REXtard04
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Any problems at idle? Maybe a bad spark plug (or multiple)?
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Old 02-26-2007, 08:32 PM   #10
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Quote:
Originally Posted by pseudosport View Post
Ok here is what I did to the car tonight.

catless uppipe
Mad Dad catless downpipe
Borla hush
stage 2 reflash (open ecu)

getting ready to do the same mod this weekend with different brand UP and DP. I have the Borla Hush and the accessport. Besides the jerkiness and the flutter sound, what is your take on the power gains? Are you still having the flutter sound problem?
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Old 02-26-2007, 08:47 PM   #11
burton2323
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look into an accessport man, very good bang for the buck
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Old 02-27-2007, 12:46 AM   #12
pseudosport
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I don't think its the spark plugs. It does not have a miss, CEL, or any idle problems. The car only had problems after i installed that list of mods but i'm not going to rule out anything yet.. Before all this the car was flashed stage 1 and ran awesome. Acceleration was smooth and no flutter noises. Now with the uppipe and downpipe I understand I'm going to hear the car spool more. What I'm hearing sounds like the car is struggling to spool. Also it does not feel like its making full boost. Once I finish installing my gauges I can get some readings or I can do some data logs by the end of the week. I'd rather trouble shoot the car and not just throw $$ at the problem.
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Old 02-27-2007, 10:10 AM   #13
Six Stars
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Did you reset the ECU after you completed the mods?
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Old 02-27-2007, 10:38 AM   #14
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Or gave it a 50-75 mile ecu learning curve?
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Old 02-27-2007, 10:47 AM   #15
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and are you getting any wierd sounds when the rough spool comes on? did you use new gaskets on the uppipe? not saying for sure but could be an uppipe leak.
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Old 02-27-2007, 10:58 AM   #16
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Quote:
Originally Posted by PrecisionPB View Post
A fella over on the OpenECU forums sells one for $25.00 that has provided very smooth power for me, both at Stg1.5 and Stg2.
What the hell is stage 1.5?

Quote:
Originally Posted by dayamdave View Post
Or gave it a 50-75 mile ecu learning curve?
I agree. When I flashed to stage II I had the same jerkiness while accelerating for a few days. Then one day I drove to work and It felt completely different. It was smooth and felt I felt a lot more powaaaa.

To the OP, wait a few miles and see if it gets better. Mine sure as hell did. I still want a pro tune to get that few extra ponies.
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Old 02-27-2007, 12:26 PM   #17
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can you log your car ?
not smooth is hard to understand - everyone has a different experience.
is your boost gauge fluctuating ?
did you adjust your WG arm before ?
woodpecking sound is normal (to some)
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Old 02-27-2007, 02:05 PM   #18
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would adjusting the wastegate cause this type of problem?
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Old 02-27-2007, 04:10 PM   #19
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the xpt map is awesome
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Old 02-27-2007, 05:07 PM   #20
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The OTS map on osecuroms.org is meant to be a starting point. It is there so you have a baseline to start from but that map needs fine tuning to make it work well for your car. It is NOT set it and forget it map. Will your car run OK on it? Possibly. Some cars reposnd better to it than others due to various reasons. Geographical location is 1, general humidity, quality of gas, atmospheric pressure, etc. IMHO, there are some things on that map that should be revised before anybody starts to seriously use it. The timing, fueling and boost all need smoothing out for solid power delivery. Some of the knock tables should be adjusted for higher loads since stage 2 car will easily surpass stock levels. Same goes map scaling. My map looks nothing like the one posted on that site. I did start off with it but once you start customizing it, it changes drastically.

You need to start datalogging the car to figure out what is not up to par in your standards. I usually do thing in this order:

- boost
- fueling
- timing

Some buy the XPT map but I am not a big fan of those maps, at least the ones for 16bit WRXs. I disagree with the general tuning approach used by the author of those maps. I hear lots of complaints from people that purchased those maps, datalogged the cars and realized the car knocking all over the RPM range. The same author did do great service to the community by developing the free maps though. Good luck.
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Old 02-27-2007, 07:34 PM   #21
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Yeah they are a great starting point. Even with the stage 1 map running 93 octane I had to pull some timing and smooth it out. I started to rescale the map but then decided to go stage 2. This weekend the EGT and boost gauges are going in then I'm going to do some data logging. Next thing on the list is a wideband.
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Old 02-28-2007, 01:27 PM   #22
Nughuffer
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Go find good gas (Mobil) and let the ECU learn. My 04 was like that somewhat but didnt actually smooth out until after 250 miles or so. Also, you getting used to throttling the car and the new boost response will help as well, or go find a better map.
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Old 02-28-2007, 02:15 PM   #23
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Quote:
Originally Posted by Nughuffer View Post
Go find good gas (Mobil) and let the ECU learn. My 04 was like that somewhat but didnt actually smooth out until after 250 miles or so. Also, you getting used to throttling the car and the new boost response will help as well, or go find a better map.
He does get good gas already He gets what I get. As far as octane is concerned, brand does not matter. If it says 93, it's 93. Gas can vary between individual gas stations based on how much traffic they see and how old the gas is in the tanks. Certain brands do carry different additives but generally, gas in New England is pretty good.

You can allow the ECU to do its fine ignition adjustments but I prefer do dial in good base and knock correction numbers myself and take as much ECU learning out of the equation as possible. You'll get more consistant results this way.
There is no 'boost learning' tables in the ECU that we know of. If the boost delivery is not up to par, it needs to be adjusted. The ECU will not learn to do it better over time. It may seem that way sometimes since the compensation maps can alter the behavior temporarily but the problem will return eventually. PM me if you need help.
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