scan on my aeroforce scan gauge

Ok..where in the RPM range? Low...high..only high at WOT?

its at WOT that i see KR from 3 to 5 sec then it drop off to zero but that on a hot and humid day .i will need to see on a cold evening if it the same

Not only that, every point of KR equals 2 degrees of timing advance drop...

If you can get your 1-2 shift point up a bit (e.g., with reprogrammed PCM) , you may find you go through the traps in 2nd gear at a bit lower than 5900 rpm (i.e., closer to 2nd gear hp peak). That should be helpful to your 1/4 mile times.

Were your 70 and 84 degree readings ambient temperature or IAT readings?

I don't have access to a 98 Regal n/a .bin file; but looking at a 98 Grand Prix n/a file, timing advance starts to be pulled at 122 F. On a 98 LeSabre n/a file, timing advance starts to be pulled at 104 F. In my experience, IAT temps on a "stock-ish" intake system can easily be 30 to 40 degrees F higher than ambient if you're idling and heat-soaking...typically not more than 5 to 10 degrees F above ambient while running. Your sig says you have a shielded intake...you should be even less affected.

Unless your testing involved alot of sitting around idling, I doubt the 70 to 84 degree F change made any difference to commanded timing...fuel/air charge density, perhaps.

P.*., on both the GP and LeSabre files, the PCM starts to add timing advance at 50 degrees F.

P.P.*., can you expand on your answer to Bill'* question...at what rpm(*) and gear(*) under WOT does the KR show?

OK wait here, so your mods are:

intake
180 tstat
no ubend/res
plugs
front pem
and ported lower intake

You have stock PCM still, correct? And your car gets up to 4* of KR?

If what im reading here is correct, I dont see the problem? L36s have KR stock, usually lots of it. That is about exactly what I would expect for KR out of that setup.

What do you run for gas? 87 octane or do u run higher?

yes i have the stock pcm and i run 87 octane for normal driving .at the track i stop at the gaz station and add 10$ of 93 octane and bump my air pressure for the back tires .But i think the hot and humid air is what the major problem i will see if the ER rockers helps


and yes those 70 and 84 temp reading are IAT [/quote]

Don,

At what rpm(*) and gear(*) under WOT does your KR show up?

low RPM when i leave full throttle and after when it shift in second but i saw that only on the street at the track i did not take time to watch it .i know also that i always have some in high gear the time the tranny kick into lower gear but i think that normal