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Old 08-08-2003, 10:17 PM   #1
wyowrx
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Default Utec tuning tip

Anyways at the track and got a knock event on my log while letting off throttle in 3rd gear at readline. TPS went to 0 and boost was still present and the ECU tried to run 38 deg timing!!!JustDSM figured it out and suggested the following:

Copy 5000 and down timing to 0% column. This way if you let off the throttle at high rpms with resident high map, you wont get det.
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Old 08-09-2003, 05:07 AM   #2
JustDSM
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So I take it, the knock issue cleared itself up?

I think you should also note that the ECU your using is reflashed by Vishnu (which runs excessive timing up top). I don't recall seeing advance numbers that high on stock ECU'd cars. I'll have to check some logs to verify however.
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Old 08-09-2003, 07:01 PM   #3
motoxphil
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11.96, 1.64, 115mph!

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wyowrx,

Nathan and I usually find that adding some fuel there is a "smoother" running option.

Thanks,
Phil
TurboXS
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Old 08-09-2003, 09:52 PM   #4
JustDSM
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Quote:
Originally posted by motoxphil
wyowrx,

Nathan and I usually find that adding some fuel there is a "smoother" running option.

Thanks,
Phil
TurboXS
Phil/Nathan,

I typically do as you suggest to eliminate knock in scenaro's like the above, however in Jack's particular case his ECU was reflashed by Vishnu. I've not paid very close attention to the ammount of advance that the OEM ECU spits out at these rpm/load points. But I've seen a few of Jack's logs where his reflash thew out 38+ degrees on the top end. I know that his setup is running grossly rich pretty much throughout the map (minus the 0% column) and believe that the knock he encountered was induced from overly advanced ignition timing.

I dont believe people with OEM ECU's will need to map timing into the 0% column's for the reasons you suggested, however Jack's case is a little "unique".
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Old 08-10-2003, 12:34 PM   #5
motoxphil
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JustDSM,

Try it, as adding + Maf will move the calculated load in the factory ecu, thus changing the ignition timing also (more MAF usually means a higher load calculation which can result in less ignition advance).

But, as you stated this is a reflashed ecu and I don't know what was altered. You can change the timing at the 0% load column but it just takes time to get it smooth and consistent.

Good luck.
Phil
TurboXS
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