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Old 03-31-2010, 08:30 AM   #1
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Exclamation GM Fix: High/Low Octane Map!

Can anyone validate whether GM fixed the problem of the low octane map & the fuse reset to assist in correcting the problem?

Also, those of you with early VIN #'s & performed the fuse reset, did the problem (drop in horsepower) eventually return? Did the dealer admit the problem & reflash to permanently correct???

According to Livernois Motorsports, stock baseline dyno for the SS are showing 360-370 rwhp, some of you are reporting 320 rwhp & you accept there is nothing wrong with you car?
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Old 03-31-2010, 08:35 AM   #2
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Originally Posted by Smirnoff View Post
Can anyone validate whether GM fixed the problem of the low octane map & the fuse reset to assist in correcting the problem?

Also, those of you with early VIN #'s & performed the fuse reset, did the problem (drop in horsepower) eventually return? Did the dealer admit the problem & reflash to permanently correct???

According to Livernois Motorsports, stock baseline dyno for the SS are showing 360-370 rwhp, some of you are reporting 320 rwhp & you accept there is nothing wrong with you car?
I guess you don't know that the SS comes in two different engines. LS3 equals manual 6, 426hp, typically dyno's in the 360+ range. L99 equals automatic 6, 400hp, typically dyno's in the 320-330 range.
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Old 03-31-2010, 10:02 AM   #3
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Thanks for keeping me honest - yes I know of the LS3 & L99 & the HP difference, for clarification many on this board with the LS3 claimed 320 RWHP was valid & is a good number.....?

But, the BIGGER issue is whether GM has a permanent fix or not? I would hate to keep pulling fuses to get the car to run right, what type of quality is that???
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Old 03-31-2010, 10:22 AM   #4
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Thanks for keeping me honest - yes I know of the LS3 & L99 & the HP difference, for clarification many on this board with the LS3 claimed 320 RWHP was valid & is a good number.....?

But, the BIGGER issue is whether GM has a permanent fix or not? I would hate to keep pulling fuses to get the car to run right, what type of quality is that???
To be honest, I do notice a difference in fuel tables. But that difference is realized based on what gas I use. Premium from Speedway, for example, is noticeably slower than Premium from Shell. Just my observation.
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Old 03-31-2010, 11:46 AM   #5
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i only use shell 93.it is a "top tier" gas.the fuse pull is simply a method to reset your computer for the high octane gas.the dealer put 87 octane in my car.this does not void your warranty
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Old 03-31-2010, 11:52 AM   #6
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Premium from Speedway, for example, is noticeably slower than Premium from Shell. Just my observation.


Circle K/QT premium is same way; I only use Chevron or Shell premium.
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Old 03-31-2010, 12:03 PM   #7
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Yup..Switched to Chevron from Costco...Big difference in price but the mileage and hp gain was even better...18+ mpg around town with my foot in it constantly.

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Circle K/QT premium is same way; I only use Chevron or Shell premium.
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Old 03-31-2010, 12:20 PM   #8
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Yup..Switched to Chevron from Costco...Big difference in price but the mileage and hp gain was even better...18+ mpg around town with my foot in it constantly.
Damn! I can't even get that on the highway.
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Old 03-31-2010, 12:22 PM   #9
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Damn! I can't even get that on the highway.
Checked my DIC and I am averaging 18.5 here. City driving for the most part.
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Old 03-31-2010, 12:22 PM   #10
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the octane map your referring to is just from the dealer you bought the car from putting their 87 octane they keep on the lot cuz they're too lazy to drive down the street and put the proper fuel in it
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Old 03-31-2010, 12:54 PM   #11
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the octane map your referring to is just from the dealer you bought the car from putting their 87 octane they keep on the lot cuz they're too lazy to drive down the street and put the proper fuel in it
Right -- the problem is when 91 or 93 octane is then poured into the tank, the low octane map doesn't convert to the high octane map....my question is, did or does GM have a permanent fix?????????????????

Other than pulling the fuses?????????????????????????????????????
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Old 03-31-2010, 01:43 PM   #12
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Damn! I can't even get that on the highway.

Same here, think I'm getting 14 and change ... and 17 and change on my LT ...
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Old 03-31-2010, 01:50 PM   #13
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Checked my DIC and I am averaging 18.5 here. City driving for the most part.
I know I shouldn't but....

Show-off!
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Old 03-31-2010, 01:52 PM   #14
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Could the fuel have come from the factory? When I bought my car, my salesmen let me take the car to fuel it up myself. Put 91 in it and I still had to do the fuse pull.
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Old 03-31-2010, 04:29 PM   #15
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I haven't seen an LS3's dyno lower than 345 rwhp or so. Most are dynoing in the 350 - 370 rwhp range depending on dyno. Some dynos are a little more generous.

The L99's are dynoing (low octane map) as low as 290s - 315 rwhp or so. The "normal" L99s are dynoing around 320 - 330 rwhp. We've seen a few stock L99 dyno higher than that but thats just because of the dyno they were running on.
On the local dyno in my town the stock L99s make around 320 rwhp, and these are good running L99s pulling low 13s (bone stock) at the track.
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Old 03-31-2010, 05:11 PM   #16
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Quote:
Originally Posted by Smirnoff View Post
Right -- the problem is when 91 or 93 octane is then poured into the tank, the low octane map doesn't convert to the high octane map....my question is, did or does GM have a permanent fix?????????????????

Other than pulling the fuses?????????????????????????????????????

I get what you are asking 100%...agreed you shouldn't have to pull fuses to reset the tables..sorry I haven't seen any concrete info either way about whether or not the the LS3s go back to the high octane table on their own. I will say I reset mine after I the first time I ran down the dealer fill and noticed nothing...
Recently I got gas in a pinch,93 but on base,..who knows whose gas it is and shortly thereafter noticed a pretty noticable reduction in performance..I ran that down and re-filled with Shell 93..no change within 50 miles so I did a fuse pull overnight and the power was back. Maybe I didn't give it enough time? I wonder how often it attemps the high octane spark table after knock...I would think it should try the high table at least eveytime the fuel level increases...
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Old 03-31-2010, 05:28 PM   #17
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GM needs to fix the low octane map. Some guys have no choice but to run lower octane. The L99's should run fast even on the low octane tune. There's no reason cars should run .7 tenths slower at the track just because they're on the low octane map.
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Old 03-31-2010, 05:32 PM   #18
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GM needs to fix the low octane map. Some guys have no choice but to run lower octane. The L99's should run fast even on the low octane tune. There's no reason cars should run .7 tenths slower at the track just because they're on the low octane map.

It is called spark knock/detonation/pre-ignition ect.....timing has to be retarded as octane decreases to prevent damage to the engine,the retarding of the ignition timing can make a big difference in power.....and I would imagine that being a production vehicle under warranty that GM is erring on the side of caution with the timing retard...just the way it is...you want to run timing on the ragged edge void your warranty and get a tune. JMO
I do think that the programming should switch back and forth between low and high octane tables without a fuse pull...if it does not already.
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Old 03-31-2010, 09:30 PM   #19
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Originally Posted by SGOS252382 View Post
GM needs to fix the low octane map. Some guys have no choice but to run lower octane. The L99's should run fast even on the low octane tune. There's no reason cars should run .7 tenths slower at the track just because they're on the low octane map.
I have a Hyptertech that has a 87 octane tune that is pretty close to the OEM high octane tune. It's not that the car can't make HP on 87 octane, but that GM won't let it.
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Old 03-31-2010, 11:08 PM   #20
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I know I shouldn't but....

Show-off!

Hahaha!!! Did not realize how that came out until you pointed it out. Maybe it is pointing out.....oh dear.
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