VQ35DE (2002-2003) Ignition Timing Question

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Sep 17, 2012 | 06:58 PM
  #1  
When the base timing is set using the Consult, does the ECU make changes to the setting on its own?
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Sep 18, 2012 | 07:52 AM
  #2  
The ECU won't change base timing, base timing is base timing.

Are you talking about the 2* advance? Or just in general?
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Sep 18, 2012 | 10:16 PM
  #3  
Quote: The ECU won't change base timing, base timing is base timing.

Are you talking about the 2* advance? Or just in general?
I'm referring to the timing that is adjustable +/- 5-degrees using the Consult or equivalent.
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Sep 19, 2012 | 08:46 AM
  #4  
it is adjustable to 17 degrees with consult. With the utec and haltech you can advance further.
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Sep 19, 2012 | 08:52 AM
  #5  
Quote: it is adjustable to 17 degrees with consult. With the utec and haltech you can advance further.
So my question is... once the timing is adjusted to whatever setting, does the stock ecu adjust the base setting on its own?
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Sep 19, 2012 | 09:21 AM
  #6  
Quote: So my question is... once the timing is adjusted to whatever setting, does the stock ecu adjust the base setting on its own?
The ECU calculates the amount of timing to give based on a bunch of conditions. The base timing is a constant that is applied to the calculated value.
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Sep 19, 2012 | 02:58 PM
  #7  
Quote: The ECU calculates the amount of timing to give based on a bunch of conditions. The base timing is a constant that is applied to the calculated value.
This is what I was trying to say earlier.

Your base is YOUR BASE. It's adjusted from there depending on a whack of stuff, load, temp, rpm, knock levels, and so forth.
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Sep 19, 2012 | 10:42 PM
  #8  
Yes, I totally understand that the ECU is constantly making adjustments to the timing advance/retard as needed.

So when I hook up the Consult (or equivalent) to make an adjustment to the timing (say 17 degrees for example) and drive the car for several thousand miles, will the 17 degree setting still be unchanged in the ECU or will the ECU have made adjustments as needed? In other words, if I were to hook up the Consult several thousand miles down the road, will the 17 degree setting still be there?

Thanks guys.
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Sep 20, 2012 | 06:02 AM
  #9  
If it's properly 'flashed' then yes, it will.
I've heard that if you run incorrect gas for the 2* advance though (89 and especially 87) then it can 'revert' back to the stock timing. Not sure about this though
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Sep 20, 2012 | 10:19 AM
  #10  
Quote: If it's properly 'flashed' then yes, it will.
I've heard that if you run incorrect gas for the 2* advance though (89 and especially 87) then it can 'revert' back to the stock timing. Not sure about this though
i should check that, I had mine advanced 2* and was running 89 with it for...about 10k miles. since april I switched to 91-93.

I was under the impression it would never change back though.
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Sep 20, 2012 | 10:19 PM
  #11  
So earlier today I had the diagnostic computer hooked up and played around with various timing values. Unfortunately, the adjusted timing values do not retain in the memory of the ECU. Bummer.
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