Performance between 89, 91 and 93 octane - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

IndeedSS1 · 06-30-2011, 07:23 AM

Quote:

Originally Posted by justa25thTA

so how exactly does the computer read the octane level of fuel?

My guess is it reads it as knock.

cmore · 06-30-2011, 07:38 AM

Here is a thread that has more info
http://www.camaro5.com/forums/showthread.php?t=38964

IndeedSS1 · 06-30-2011, 05:15 PM

This is the stock Octane tables.

GEEo · 07-07-2011, 09:18 PM

Quote:

Originally Posted by cmore

Has anyone done a study on the performance difference in using 89 Vs 91 Vs 93 octane gas?

I remember trying to put 87 on my car when it wus 2 months old and the car felt weird.

I got scared that I might break something so I've been putting 93 ever since.

bmorecam · 07-07-2011, 09:47 PM

This is what my car loves now..

IndeedSS1 · 07-08-2011, 06:42 AM

Quote:

Originally Posted by GEEo

I remember trying to put 87 on my car when it wus 2 months old and the car felt weird.

I got scared that I might break something so I've been putting 93 ever since.

Well at least you you learned early age, that when there is a minimum recommend octane, that's what you should use

.

My 72 Chevelle would tell me loud and clear when I wasn't running good enough gas. It had a thirst for the expensive stuff. It was a she.

Snidely Whiplash · 03-20-2014, 11:21 PM

Quote:

Originally Posted by IndeedSS1

Well at least you you learned early age, that when there is a minimum recommend octane, that's what you should use

.

My 72 Chevelle would tell me loud and clear when I wasn't running good enough gas. It had a thirst for the expensive stuff. It was a she.

You must have bumped the compression. Starting in 1971, the compression ratios took a BIG nosedive.

Cyber Gray · 03-21-2014, 01:29 AM

Guys, I'm getting L99 soon so would a fuse pull correct the fuel reading or will I still need to get a tune.

The octane were I live is 95 for premium and 91 for regular

Spartan01 · 03-21-2014, 06:26 AM

Quote:

Originally Posted by Cyber Gray

Guys, I'm getting L99 soon so would a fuse pull correct the fuel reading or will I still need to get a tune.

The octane were I live is 95 for premium and 91 for regular

Ok, here is how it works.

The car (ss) is designed to run on 93 octane. If anyone ever (most dealers, the cheap bastards) puts less than 93 octane into it, the computer switches the fuel map to run on lower octane.

The problem is that the fuel map does not switch back after running out of the low octane and replacing with 93.

You must manually reset the fuel map by doing a fuse pull or installing a tune.

to do the fuse pull properly, run the tank down to almost empty.
Fill up with the good stuff, run the car for another 50 or so miles to clear out the junk fuel, then do the fuse pull overnight.

eventually, maybe you could get a custom tune for the 95 octane, that would be a beast!

Where do you live that they have 95???

Tampa Tuning · 03-21-2014, 06:32 AM

From a calibration ballpark perspective, I cant add as much timing because knock pops up all the time with lower octane.

Lets say I can get for example 22 degrees of timing at WOT with 93 Octane, its about minus 2 or 3 degrees for 91 Octane, and about minus another 2-3 for 87 octane.

Josh @ Spartan LSX · 03-21-2014, 08:06 AM

As a non-tuner, you won't really see what's actually happening to the car. For us tuners, we see it all over the data log screen when knock retard starts showing up everywhere.

There is a significant change in the cars calibration with a lower octane, especially in these 4000lb beasts. I've tuned customers cars before that insist on running their 5th gen on 87 and was pulling OUT timing from the STOCK low octane timing table. I'd wager to say you lose 30'ish rwhp to efficiently run 87 octane with no knock retard in a large car like the 5th gen.

v8 · 03-21-2014, 08:34 AM

There is a huge difference on the ZL1. When I bought my 13 it had about 30miles on it. When I drove it I thought it was a dog. I ran the tank almost empty, put in 94 and drove around for a bit. I then did the fuse pull and it was a huge difference.

Cyber Gray · 03-21-2014, 08:39 AM

Quote:

Originally Posted by Spartan01

Ok, here is how it works.

The car (ss) is designed to run on 93 octane. If anyone ever (most dealers, the cheap bastards) puts less than 93 octane into it, the computer switches the fuel map to run on lower octane.

The problem is that the fuel map does not switch back after running out of the low octane and replacing with 93.

You must manually reset the fuel map by doing a fuse pull or installing a tune.

to do the fuse pull properly, run the tank down to almost empty.
Fill up with the good stuff, run the car for another 50 or so miles to clear out the junk fuel, then do the fuse pull overnight.

eventually, maybe you could get a custom tune for the 95 octane, that would be a beast!

Where do you live that they have 95???

Thanks for the advice man. It is always good to read your comments

Im not from the states actually. I live in Oman and work for its leading Oil company. Thats why we are good in producing high octane

It is very far to extend a pipeline to you

06-30-2011, 05:15 PM	#17
IndeedSS1 Drives: 2010 Camaro SS LS3 Join Date: Sep 2010 Location: Eastern MO Posts: 3,786	This is the stock Octane tables. Attached Images __________________ She is only memory now.

07-07-2011, 09:47 PM	#19
bmorecam Account Suspended Drives: jealous vendors mad!! HAHA!! Join Date: Jan 2011 Location: CYBERGMONSTER@GMAIL.COM Posts: 3,658 View My Garage	This is what my car loves now.. Attached Images

03-21-2014, 01:29 AM	#22
Cyber Gray Wind Rider Drives: ZL1 19 White; Jeep 5.7 GC 15 Join Date: Jan 2010 Location: Muscat Posts: 2,059 View My Garage	Guys, I'm getting L99 soon so would a fuse pull correct the fuel reading or will I still need to get a tune. The octane were I live is 95 for premium and 91 for regular __________________ Im not Gray any more !!

03-21-2014, 08:34 AM	#26
v8 Drives: 19 Z06 Join Date: Nov 2011 Location: Oakville Ont. Posts: 1,427	There is a huge difference on the ZL1. When I bought my 13 it had about 30miles on it. When I drove it I thought it was a dog. I ran the tank almost empty, put in 94 and drove around for a bit. I then did the fuse pull and it was a huge difference. __________________ Gone but not forgotten: 1974 Corvette Stingray 454 1986 Z28 2009 Mustang GT convertible 2012 45th 2SS Vert 2013 ZL1 M6 2014 Zl1 M6 2014 GT500 2016 Challenger Hellcat M6 www.youtube.com/c/garageking

06-30-2011, 07:38 AM	#16
cmore Drives: 2011 Victory Red Auto 2SS Join Date: Aug 2010 Location: West Tn Posts: 628	Here is a thread that has more info http://www.camaro5.com/forums/showthread.php?t=38964

03-21-2014, 06:32 AM	#24
Tampa Tuning Account Suspended Drives: TAMPA TUNING FACEBOOK & INSTAGRAM Join Date: Oct 2010 Location: Tampa, Fl Posts: 3,044	From a calibration ballpark perspective, I cant add as much timing because knock pops up all the time with lower octane. Lets say I can get for example 22 degrees of timing at WOT with 93 Octane, its about minus 2 or 3 degrees for 91 Octane, and about minus another 2-3 for 87 octane.

03-21-2014, 08:06 AM	#25
Josh @ Spartan LSX Drives: A wrench Join Date: Jan 2010 Location: East Atlanta Posts: 353	As a non-tuner, you won't really see what's actually happening to the car. For us tuners, we see it all over the data log screen when knock retard starts showing up everywhere. There is a significant change in the cars calibration with a lower octane, especially in these 4000lb beasts. I've tuned customers cars before that insist on running their 5th gen on 87 and was pulling OUT timing from the STOCK low octane timing table. I'd wager to say you lose 30'ish rwhp to efficiently run 87 octane with no knock retard in a large car like the 5th gen.