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Old 08-03-2003, 01:02 AM   #1
Tap
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Default Reflash to remove lean map

Can any of the various reflashes available totally remove the lean map and only leave the rich map?? I love using the UTEC but once I get a good set up with no knocks the ECU will eventually switch to a leaner map. Then I get det. which I have to tune out. If I get to many det events the map goes rich again and I am back where I started. If I put maps in more of the switch positions of the UTEC that would be a start. But right now the UTEC is filled with the different octane maps and the "wife" map.

I am running a TurboXS stage 4 with FMIC and perrin fuel rails.
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Old 08-03-2003, 01:54 PM   #2
PaulRex
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Does this happen to all UTEC equiped cars? I don't have a wideband a/f gauge with me all the time, but I havn't been having large detonation problems after I get a good tune a week later either.
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Old 08-03-2003, 03:11 PM   #3
Tap
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The ECU itself is what does it. It manipulates two different maps basically for good vs. bad gas. If the ECU record X number of knock events in Y time period it changes to the richer map (what X and Y is I haven't figured out). What I experience is the ecu adding fuel which I take slowly out via the UTEC then the ECU sees the engine running well and starts taking out fuel itself then bam, knock again. Why don't I leave it rich you say?? When I start hitting 98-100 IDC I have no choice but to lean it out some. I can feel the car hesitate when I start maxing out the IDC, feels like the UTEC taking out timing for a knock but no flashing CEL. Do a data log and 98-100 IDC. If I could reflash the ECU to stop it from manipulating or switching between two maps I think I could get a more consistant tune.
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Old 08-03-2003, 05:06 PM   #4
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You need to first make sure the ECU is in the lean map, then tune your UTEC. That way, the ECU shouldn't switch over to the rich map unless something is wrong (ie bad gas). Tuning while the ECU is on the rich map doesn't make sense because of the very issue you're describing. Why would you want to pay for a reflash and then the UTEC on top of that? A reflash could take care of everything for you, or spend the same amount of money on a link+ or something and leave the piggy back world.

-- Ed
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Old 08-03-2003, 05:58 PM   #5
Tap
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I want the UTEC for the ability to tune for different gas, funtions and conditions. A reflash will not do that for me. I just don't want to continually fight the ECU for control of the fuel. If I get knock events I want to take it out not have the ECU try and correct. Tuning in either the rich or lean map doesn't make a difference to me I just don't want to make two maps for each setup I want to run (not to mention there are a limited number of positions on the UTEC).
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Old 08-03-2003, 08:48 PM   #6
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the point is that if you tune the UTEC while the ecu is runing the lean map, and tune properly with no knock, then there is no reason for the ecu to ever switch to the rich map, making things consistent. A reflash WILL hangle different conditions. The different fuel is an issue for now though.


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Old 08-03-2003, 10:31 PM   #7
Tap
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It shouldn't switch over to the rich map with a good tune but lord knows I get a good tune on the lean map, it runs well for a couple of days then CEL flashes between a hard shift and back to the rich map I go.
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Old 08-03-2003, 10:39 PM   #8
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Do you really have to make changes to your map every couple of days?? That's insane. I still say make sure that you're running the lean map and only tune with that. I guess the real question for you is how to get the ECU to switch to the lean map quickly so you can do your tuning. Upon reset, which map does the ECU run?

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Old 08-05-2003, 07:39 AM   #9
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I have a UTEC and I am not experiencing this. Neither have 3 of my buddies with them.
When did your problem start? Where are you located? Do you happen to know what allocation# your car was? (just for my own tracking purposes
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Old 08-05-2003, 07:49 AM   #10
x99percent
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Quote:
Originally posted by Tap
It shouldn't switch over to the rich map with a good tune but lord knows I get a good tune on the lean map, it runs well for a couple of days then CEL flashes between a hard shift and back to the rich map I go.
You have gotta be knocking an *awful* lot for the ECU to switch to the high-det (rich) fuel map.

The stock ECU switches to the high-det fuel map when the Ignition Advance Multiplier is at 4 or less. Have you verified that this is what is happening with DeltaDash? If not, then you really don't know...

The car should be tuned to run knock-free on the low-det (lean) fuel map. Even the infamous "shift-knock" can be eliminated with the UTEC.
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