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Old 09-10-2003, 12:55 PM   #1
big_adventure
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Member#: 40501
Join Date: Jul 2003
Location: Paris, FR
Vehicle:
2005 Decathalon 21sp
One WheelSeanPower

Exclamation EcuTek experts or ECU experts - HELP!

Does anyone know, for certain, the conditions under which the 04 ECU will switch from closed-loop fueling to open-loop fueling?

I know that the 02-03s switch at 63% TPS or, apparantly, 5500 revs. My 04 does NOT do this, even at WOT, it seems to take it 2-3 seconds to make the switch. This leads me to believe that it can't be based just on TPS.

If anyone has access to the ROM file for the 04, I'd really, truly appreciate this information.

Also, if anyone knows how to fix this, I'd also love that information. My ideas are to either get a reflash if it will fix it, or use an 02-03 ECU, if it's possible and if a reflash won't fix it.

I stress, I really want knowledge here, not just guesses. I can't tune around this problem with my UTEC, because the UTEC has very limited effects on CL fueling. Check this thread for vastly more information:

http://forums.nasioc.com/forums/show...hreadid=418321

Thanks in advance,

Sean
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Old 09-10-2003, 11:35 PM   #2
turboICE
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WRB & Black/Silver

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Sorry if this is not exactly what you were looking for - but XEDE gives you great control over transition to OL through their TPS intercept, it works great with 02-03. Check with Vishnu on the stock ECU switch overs.
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Old 09-11-2003, 01:27 AM   #3
big_adventure
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Thanks. I think that what I'm going to do is get the ECU reflashed, both for the switchover point and to control fueling for my STi injectors on pump gas. I'll probably combine, and use my UTEC to provide timing, knock control and boost, and also to provide a race-gas map.

I'm waiting for a TXS response to my concerns, and I'm working with Clark in AZ.

Thanks,

Sean
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Old 09-11-2003, 03:45 AM   #4
skywalker
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Location: San Diego, CA
Default Re: EcuTek experts or ECU experts - HELP!

Quote:
Originally posted by big_adventure
Does anyone know, for certain, the conditions under which the 04 ECU will switch from closed-loop fueling to open-loop fueling?

I know that the 02-03s switch at 63% TPS or, apparantly, 5500 revs. My 04 does NOT do this, even at WOT, it seems to take it 2-3 seconds to make the switch. This leads me to believe that it can't be based just on TPS.

If anyone has access to the ROM file for the 04, I'd really, truly appreciate this information.

Also, if anyone knows how to fix this, I'd also love that information. My ideas are to either get a reflash if it will fix it, or use an 02-03 ECU, if it's possible and if a reflash won't fix it.

I stress, I really want knowledge here, not just guesses. I can't tune around this problem with my UTEC, because the UTEC has very limited effects on CL fueling. Check this thread for vastly more information:

http://forums.nasioc.com/forums/show...hreadid=418321

Thanks in advance,

Sean
This is something I have not looked at as of yet. But from what is in the EcuTeK software I can see there is a Open/Closed Loop Fueling at a Throttle Theshold of 25% and Open/Closed Loop Fueling at a Load Threshold of 6ms.

This gives me the impression that at least 25% throttle and under a consistent load for more then 6ms then the Closed Loop will switch over. So my guesses are it will come on when you are cruising down the highway at a consistent load for 6ms, which will give you better fuel economy but under quick accelerations at any throttle, load and boost the values it will run in open loop mode.

Here are my reasons for this design, which is actually sheer genius by Subaru.

1. It takes up less space on the board, so other cool features can be added.
2. This is a common problem on how to resolve the pinging and knock issues under quick changes in loads, which are #1 reason for pinging and knocking. Subaru solved this problem with the ECU by using some amazing thinking. So simple but yet works so well.
3. A possible idea under full boost at a consistent load level, which happens while the car is already in full boost and the load is dropping slowly, the ECU can actually retune the car for optimal performance. Possible, what amount of time would be required for this though?

Bill Knose
I-SpeedUSA

Last edited by skywalker; 09-11-2003 at 03:56 AM.
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Old 09-11-2003, 12:33 PM   #5
big_adventure
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sorry for all the double posting. See my reply, with more information that I've seen, at:

http://forums.nasioc.com/forums/show...7&goto=newpost


Thanks,

Sean
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Old 09-11-2003, 12:46 PM   #6
big_adventure
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2005 Decathalon 21sp
One WheelSeanPower

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I didn't really finish that, not enough of a teaser...

Basically, my car will transition to OL, as tested, as low as 30%. I've not tried 25%. However, it ALWAYS takes 2-3 seconds to make the transition.

Check out more at the link above...

-Sean
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Old 09-13-2003, 01:52 PM   #7
hao
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Location: Bay Area, CA
Default

Hey Sean,

Glad you fixed that uppipe leak the last time I saw you at bamboo hut.

Sounds like you still have a problem, but I think you are on the right track. For $hits and giggles I have an 03 WRX ECU if you want to try that out in your car. I will however need to verify the pinouts are exactly the same before just slapping that puppy in there.

And if you need a COBB reflash I can defintely help you out on that.

drop me an email or PM me

Hao

hao@dss-racing.com
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