high low octane timing degree

[cuffnstuff1]

Ok I have a ultra gauge that tells me the timing degree while i drive.

how would i use it to tell if im in low octane mode or high octane mode.

The dealer and I put 87 in my 2012 2SS/RS, I then let the tank run down to 4 gallons and filled up with 90 (93 not avalible) I did the fuse pull for 2 hours and I did not see a change with my timming degree numbers.


Am I looking for high degree numbers when its in high octane mode and low number even in negative with low octane mode, or vise versa?


I hope theres someone that could answer this.

[gmen09]

I would be interested to here any responses

[cuffnstuff1]

HMMMMM wonder if anybody really knows, theres so much talk about the fuse pull

[3rdgen3]

Originally Posted by cuffnstuff1

Ok I have a ultra gauge that tells me the timing degree while i drive.

how would i use it to tell if im in low octane mode or high octane mode.

The dealer and I put 87 in my 2012 2SS/RS, I then let the tank run down to 4 gallons and filled up with 90 (93 not avalible) I did the fuse pull for 2 hours and I did not see a change with my timming degree numbers.


Am I looking for high degree numbers when its in high octane mode and low number even in negative with low octane mode, or vise versa?


I hope theres someone that could answer this.

How did you drive your car when you had the tank of 87 in it? If the car spent most of its time idling or just cruising around, chances are your knock sensor did not pick up enough ping/knock retard to set the ECU into low octane mode, unless you were going WOT for a bit and got the revs up, it most likely didnt make a difference.

Generally speaking though, if its in low octane mode, you will have less overall ignition timing (lower numbers) throughout the RPM range then you would if it was in high octane mode (high numbers).

[Rhino79]

The stock high octane timing will run mid to high 20's, low octane will be 5-8* lower.

[cuffnstuff1]

Originally Posted by Rhino79

The stock high octane timing will run mid to high 20's, low octane will be 5-8* lower.

so is this at idle or WOT

[Motion427]

At WOT.

[cuffnstuff1]

Originally Posted by Motion427

At WOT.

Ok then i am in high octane level. it running at 28-30. the two tanks or 87 octanine was real lighlty ran interstate bringing it home at some in town, did not want to open it up to much to break it in.

[JANNETTYRACING]

Originally Posted by cuffnstuff1

Ok I have a ultra gauge that tells me the timing degree while i drive.

how would i use it to tell if im in low octane mode or high octane mode.

The dealer and I put 87 in my 2012 2SS/RS, I then let the tank run down to 4 gallons and filled up with 90 (93 not avalible) I did the fuse pull for 2 hours and I did not see a change with my timming degree numbers.


Am I looking for high degree numbers when its in high octane mode and low number even in negative with low octane mode, or vise versa?


I hope theres someone that could answer this.

Unless you had a spread sheet of the high and low octane timing maps and were able to pick out the Cylinder grams per second and RPM to find the cell it is pulling from on both maps at the same time it would be nearly impossible to see while driving.

You would have to log then go back and review having all this data available at the same time.

Much Like I do while tuning.

Ted.