Timing Advance Question...

[Andy]

Does anybody else get readings of negative degrees on the autotap for the timing advance?

I seem to always be in the range of -42 thru -3. It is always in there somewhere. Typically -24 when at WOT. Is this bad, good, O ****? Anybody else see these numbers. Are they hurting performance? Should I try to fix them?

Like I have mentioned before I am in the process of getting n2o and if this is something that needs to be looked at first then I gotta do it.

Side note: Anyone know of or are looking to sell a kit, part of a kit, bottle, FSS, etc. I am trying to get this stuff but damn its expensive. I dont want to do it all without being as careful as possible.

thanx
Andy

[DEE97GTP]

Your car is going to blow up!!! j/k Well for some reason '97 grand prixs show negative timing, but later models display it correctly. I guess fbodies are the same way?

Just pretend the (-) isn't there. ;)


DEE

[Jason McCallister]

This was posted on Autotap's forum...

<blockquote>quote:</font><hr>I believe on your vehicle (and most GM's)that a negative number indicates before TDC (advance).
It should be described that way in the service manual also.
<hr></blockquote>


HTH! :D

[Andy]

is that a bad thing or a ok thing? I just want to make sure it isnt bad. Anybody else seeing this and what does it actually mean. Bad plugs, wires?

What can I do to change these numbers, if they are bad. Anyone have a link to a more explanitory article?

Got the n2o all lined up. Just need to set everything else up straight.

Thanx
Andy

[Magnus]

24 degrees of advance at WOT is normal. Shouldn't be that bad for nitrous either.

Mike Huff saw 29 with the Jet Chip.
I saw 28 with no Jet Chip and use a MAF Translator Plus to increase it 2 degrees for NA.

More advance is not a good thing with Nitrous. You could get away with 10 degrees of advance on nitrous and still run fast.

[Andy]

so the negative is just for specifiying advance or retard. right.

40 at some points and 8 at some points are fine as long as it is around 24 at wot?

If it is then I am ready to roll.

Wish me luck with the n2o

Andy

[Andy]

checked the autotap logs again and I am running an average of -22.9 in timing.

Andy

[Magnus]

The - signal is an error or something.. just pretend its not there.

the higher the RPM's go, the more advance you will see at WOT..

[Ironman24]

Your timing is fine to run the nitrous but the ecm will probly pick up a little knock on the bottle and retard the timing. If going with a 75 or higher shot I would suggest getting something to retard the timing a little. Either the MSD DIS4 unit or the MAFT+ will work. I would suggest the MAFT+ unit, it's cheaper and provides more tuning options for base and WOT fuel settings. I'm going to be doing a little nitrous testing tonight with the MAFT+ and dyno with it on Saturday.