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It looks like you're using a little too much base timing. My own combination never runs more than 32deg total on the top end. I see yours around 37. I don't run that much timing even on E85. That's more for light cruise and trailing throttle.

I second this. If you set the IAM to 1 (100% coarse spark advance or all of your learned spark) and you get knock as you describe, you are running too much base spark advance. take 5 degrees out of your base map in the areas where the knock is detected, then try again.



3-4% of 15.3 ms doesn't seem like a meaningful amount to me. I would ignore it.



I'd recommend:

1) Keep IAM at 1
2) reduce base spark advance in areas where you got knock
3) keep logging
4) not get hung up on fine spark advance



good luck
 

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Cheers guys, I'm really tempted to copy the base timing map from the US Impreza EJ251 (well only the figures and locations that are LESS than mine AND say only above 75kPa and 3200RPM ). I compared almost all of the other EJ251 maps and mine does have more base timing in a lot of areas (maybe due to our fuel being 91, 95 or 98 octane? I only run 98 these days).

Even my learned spark table looks very odd in some places compared to the other EJ251's (even the USDM ej251 and ej253's match) but the AUD is very different! I've always been suss about that 11deg figure sitting in the middle of 4 and 5deg figures too.

I'll stick with the plan you suggested Hatecrew as step 1 and see what the logs are like! Will let you guys know how it goes.
 

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2000 2.5RS BRP
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Discussion Starter #163
I think your fuel is similar to ours. The rating systems are different, but the result is the same. Oz 98 is like US 91. You have the slow evap fuels like we have out west.

Japanese fuel is wild stuff, from what I've heard. Never been there to confirm that, though.
 

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Hey guys, been having some cold start issues, hoping someone can help.

ECU is 2002 RS
I'm on 440cc light blue injectors, with a gm 2 bar map and idle is set to 1200rpm.

When I first start the car it idles like normal cold start, but then you can see it starts getting really rich on the wideband (also as excepted). The strange thing is that my short term trim starts getting negative and my AF ratio starts going towards 14.7. Problem is it overshoots and I go really lean and the car stumbles. I basically give it throttle when it starts to get lean and its fine. Warm idle is fine as well.

If anyone can give a general "lesson" on tuning the cold start I'd appreciate it.
 

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2001 Impreza 2.5RS+T 2001 Legacy GT
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as excepted?

I'm using an Emanage Ultimate and I would have this problem too when I first got in to tuning it. The injector settings were way off, but that was going off of information I'd found around the board. "the scalar doesn't work so you have to fiddle with it". Nah, the scalar works perfectly. No longer have cold start issues.

So you have some settings that are incorrect but I don't know enough about ProjectLambda to help.
 

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Hey guys, been having some cold start issues, hoping someone can help.

ECU is 2002 RS
I'm on 440cc light blue injectors, with a gm 2 bar map and idle is set to 1200rpm.

When I first start the car it idles like normal cold start, but then you can see it starts getting really rich on the wideband (also as excepted). The strange thing is that my short term trim starts getting negative and my AF ratio starts going towards 14.7. Problem is it overshoots and I go really lean and the car stumbles. I basically give it throttle when it starts to get lean and its fine. Warm idle is fine as well.

If anyone can give a general "lesson" on tuning the cold start I'd appreciate it.
Are you using gm intake air temp sensor or the stock one thats integrated into the stock map sensor? If you are using gm, the scale could me messed up.

Perhaps try disabling o2 closed loop, see what the results are. It seems like once you hit a certain temp (like when the car activates o2 feedback) is when your situation begins.

Do you have any big exhaust leaks?

Whats your setup like?
Have you changed many parameters in your map?

Good luck!
 

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The "as expected" is cause it's supposed to run rich at cold start no?

I assume I do have some settings that could be tweaked a bit.

I have an 04 technically so it has a separate IAT. I will be replacing it with a GM IAT shortly.

I don't have any exhaust leaks. I can try turning of the O2 adjustment, just can't drive with it obviously since it turns off knock as well.

The only things I've changed is rescale for the MAP and the injectors, the idle, and my base fuel/power fuel and timing. I haven't been messing with the fuel warmup stuff.
 

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The "as expected" is cause it's supposed to run rich at cold start no?

I assume I do have some settings that could be tweaked a bit.

I have an 04 technically so it has a separate IAT. I will be replacing it with a GM IAT shortly.

I don't have any exhaust leaks. I can try turning of the O2 adjustment, just can't drive with it obviously since it turns off knock as well.

The only things I've changed is rescale for the MAP and the injectors, the idle, and my base fuel/power fuel and timing. I haven't been messing with the fuel warmup stuff.
Yea, normal to run rich on cold start.

04? With Project Lambda Tuner? I didn't know that was possible. I assume you just swapped out the 04 ecu with an 02 ecu, correct? Did you confirm everything pins out correctly?

What ecu are you using? I.e. AE850x, AH966, AF408, etc

I am assuming you are on AF408. To disable closed loop in PL Tuner, go to O2 sensor>Closed Loop Min Temp: Set to max

Is you your IAT in the plastic intake tube (normal for 04), with map sensor on the throttlebody? In 2002, IAT was integrated with the map sensor, and located on the intake manifold. The wiring is a little different, maybe the pin outs are too (at the ecu). Youd probably have a cel if something was setup wrong here, so I'm guessing everything is ok.

When you datalog, does the IAT temps seem accurate?
 

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You changed your injector scaling, but did you also change your load and airflow scalers?
I only ask because I didnt realize that load and airflow scalers needed to be changed when I changed my injectors.
 

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Yea, normal to run rich on cold start.

04? With Project Lambda Tuner? I didn't know that was possible. I assume you just swapped out the 04 ecu with an 02 ecu, correct? Did you confirm everything pins out correctly?

What ecu are you using? I.e. AE850x, AH966, AF408, etc

I am assuming you are on AF408. To disable closed loop in PL Tuner, go to O2 sensor>Closed Loop Min Temp: Set to max

Is you your IAT in the plastic intake tube (normal for 04), with map sensor on the throttlebody? In 2002, IAT was integrated with the map sensor, and located on the intake manifold. The wiring is a little different, maybe the pin outs are too (at the ecu). Youd probably have a cel if something was setup wrong here, so I'm guessing everything is ok.

When you datalog, does the IAT temps seem accurate?
Hey, should have had more detail, my bad. The wiring is converted from the body harness of an 02. The engine harness is still from an 04 so I do have the plastic IAT and the MAP in the throttle (that one is blocked off with a line going from the manifold to the GM map). AF408 is my ECU.

Oddly enough the closed loop minimum coolant temp default for the AF408 is 5 degrees. Seems like it'd put me into closed loop prematurely which would explain the fueling adjustments?

IAT seems accurate based on the scangauge. I haven't logged it but I can't imagine the scangauge and the ecu having different readings.


Impreza Boy, I did. Sorry should have mentioned that as well. I followed the parameters in this thread.


Not sure if there's some parameters I should change based on the higher idle setting (although my warm idle is fine).
 

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Discussion Starter #171 (Edited)
I never updated info on the newer tables that are available, like IAC functions and warm-up fueling. I think you'll find the answer in your warmup IAC & fuel settings. I had to take out some fuel and introduce some air at idle. It wasn't just all working in the main VE tables.

I had to blip the gas or hold the throttles open when cold at first until these tables were dialed in. If you have a minor tuning issue with the car like stalling or overly rich running, there's usually a side table in here that will help out for that condition.
 

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hey guys hope everyone is still having fun with this software, what have we been up to?

I haven't been up to a lot, mainly sourcing bits for the turbo conversion (td04, 450x300 fmic, 250lph fuel pump, blue 550cc injectors...) and I just ordered a bosch map sensor that I believe is actually 4bar rated, not 3 that I thought.

Do you think this will be an issue as I'll only ever really go near 15psi/1bar gauge max boost? Ie, being that its a 4bar sensor and we only have 16 columns to play with, the resolution might not be all that great (unless the ecu does some sweet interpolation between kPa columns??).

OR could I just set the VE table (for example), be tuned for 20kPa (vacuum) up to to say 200kPa (15ish PSI boost) and forget about the excess 200kPa that the map sensor is capable of and which I don't need..


The sensor I ordered is a bosch 0281002576, 4 wire with the IAT bit,
 

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Same boat. Building a setup for a rotated 16g, bought a core for a TMIC, 550cc blues, etc. Hoping to dial in the cold idle this time, and make sure I don't run out of fuel like on the td04 with 440cc light blues.

I've only got a tune up to 12 PSI on my 2 bar GM map sensor. Was worried about the exact same thing you were saying about the resolution. Realistically its not an issue as long as you watch for any spikes.
 

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yea, the last bit i'm worried about is that it might not be any good at the high vacuum and idle areas, its only rated to 50kPa whereas my engine idles at 33kPa (hot) and about 40kPa cold.
 

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How come you guys aren't using gm 3 bar map sensor and gm iat? These are tried and true parts. Ive used them on multiple setups.

I'm pretty sure the ecu interpolates between boxes in the tables.

If you are maxing out 440cc light blues, decap them.

just my 2 cents.



Good luck guys!
 

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2001 Impreza 2.5RS+T 2001 Legacy GT
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Sorry if this has already been answered. How do the flash licenses work? Do I need to buy one for each ecu I want to flash, or does one need to be purchased every time I want to flash my one ecu?
 

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2001 Impreza 2.5RS+T 2001 Legacy GT
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What's the most common way to communicate with the bluessm? laptop with Bluetooth functionality? flashing anything over Bluetooth seems scary, is there a way to do it with a cable? I already have a VAGCOM..
 
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