08-25-2009, 08:38 AM | #15 |
Drives: 2010 Cyber Grey 2SS/RS LS3 Join Date: Jul 2009
Location: Albuquerque
Posts: 153
|
If you have a custom tune and are happy I wouldn't try this. It may reset the computer and your out a custom tune.
|
08-25-2009, 09:25 AM | #16 | ||
Petro-sexual
|
Quote:
Quote:
See above...
__________________
'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // TooHighPSI Port Injection // FF // Katech Dual In-Tank // Soler 103 // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
||
08-25-2009, 09:33 AM | #17 |
Driving daily
|
All the buzz about this so I figured why not try it. I pulled mine last night. No change in my car at all this morning. None. Zero. Zip. Nada. My L99 launched like a rocket from day one so I didn't expect anything.
__________________
Art in Missouri
Last edited by monza66mo; 08-25-2009 at 10:51 AM. |
08-25-2009, 09:36 AM | #18 | |
Petro-sexual
|
Quote:
Thanks for sharing
__________________
'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // TooHighPSI Port Injection // FF // Katech Dual In-Tank // Soler 103 // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
|
08-25-2009, 09:42 AM | #19 |
formerly "wh0rsep0wer"
Drives: 2016 1SS Summit White Join Date: Oct 2008
Location: Myrtle Beach, SC
Posts: 489
|
I tuned in HPTuners on my LS1 and if it is the same for an L99/LS3, this is what happens when you pull the fuses:
There are two tables values used for spark timing - high octane table and low octane table. If you use 93 octane from day one, your computer is using spark timing from the high octane table. If you got a tank of 87 from the dealer, the engine experienced premature detonation and the knock sensors went crazy, and told the computer to use the low octane timing table. What is supposed to happen is after a while of not seeing detonation from the knock sensors, the computer (ECU)tries the high octane spark timing table again. (This doesn't appear to be happening - THIS IS THE PROBLEM!!!!). The values in the high octane and low octane tables are NON-VOLATILE MEMORY (meaning they are there even if you lose power -like when you do the fuse pull). These tables are usually adjusted when you get a custom tune, and burned into the non-volatile memory. So therefore if you get a custom tune YOU WILL NOT LOSE THESE "TUNED" VALUES with the fuse pull. What WILL happen with the fuse pull is your volatile memory will be reset. This includes long term + short term fuel trims, knock retard, etc... but what is important in this case is the little parameter that determines which spark table to use will reset...meaning if you were running from the low octane tables before (safe + slow mode), after the fuse pull it will force the computer to try the high octane table again (super giggle fun happy rockin' mode). However it is important to note that you shouldn't need to try the fuse pull if you've only used high octane gas since getting a custom tune, because burning the tune to the ECU resets all volatile memory. This is why it will go through the idle re-learn process and may run a little weird for the first 20 minutes or so after burning a tune or pulling the fuses. Pulling the fuses is no different from recovering from a dead battery. The only reason I could see that it would be a problem to pull the fuses is if GM wanted to run diagnostics on the cars with the problem and needed to see the volatile values.
__________________
2010 1SS/RS - CGM/Gray Interior - M6 (SOLD) Kooks 1 7/8" headers, Solo Mach-X, Vararam.
2012 2LS - Black A6 (SOLD) 2016 1SS Summit White A8 Last edited by Camar0wn3d; 08-25-2009 at 09:53 AM. |
08-25-2009, 09:50 AM | #20 | |
Drives: 2010 RY 2SS with Custom Stripes Join Date: Mar 2009
Location: Jennings, La.
Posts: 2,220
|
Quote:
|
|
08-25-2009, 10:04 AM | #21 |
Camaro SL,UTs
Drives: 2010 Camaro SS/RS #16429 Join Date: Sep 2006
Location: South Jordan, UT
Posts: 7,358
|
If you use 91 octane (it's the highest available in my area) will the computer use the high octane tables? Anybody?
__________________
|
08-25-2009, 10:14 AM | #22 | |
Drives: 2020 ZLE 67 SS350 Join Date: Jul 2008
Location: Kentucky
Posts: 537
|
Quote:
|
|
08-25-2009, 10:21 AM | #23 |
Drives: never fast enough Join Date: Apr 2009
Location: CO
Posts: 59
|
You only have 91 octane because you live in a higher elevation. the same is true for where i live. You don't need the higher octane at higher elevations. I am gonna go further on this speculation, as i believe what wh0rsep0wer said is correct and the cause for the cars to run better, but since no one has logged data from before and after the fuse pull....
Some are saying they have filled up with premium (91 or 93) gas since day one. Well if you got old gas that wasn't up to standards with the high compression of these engines it will easily cause the engine to knock thus kicking you into the low octane spark table, even though you have filled with premium since day one. Always fill up from a good fuel source that gets fresh fuel often, as it doesn't take long for gas to go bad. |
08-25-2009, 11:51 AM | #24 | |
Blessed
Drives: 2013 Sonic RS MT Join Date: Dec 2007
Location: Saint Augustine FL
Posts: 28,444
|
Quote:
Obviously this isn't a GM approved thing. But there shouldn't be any real risk. FWIW.
__________________
Click image to see build thread. PQ - "the love of cars. It's a boys first step toward manhood and a mans last hold on boyhood." Fbodfather - "We do not want to use the Z28 moniker on a car that does not deserve this hallowed name." The_Blur - "Let's not confuse competitors with equals." |
|
08-25-2009, 01:15 PM | #25 |
Drives: 2010 SS & 2008 C6 Join Date: Mar 2008
Location: VA
Posts: 1,819
|
I have dynoed mine before fuse pull 319rwhp 2 pulls back to back, and after fuse pull w/ in 5 minutes of the other 2 runs and picked up 8rwhp, 327rwhp.
__________________
2010 SS L99, 536rwhp 10.843@126.72. Whipple Supercharger stock pulley, ARH 1 7/8 longtubes w/ catted xpipe, magnaflow 3" mufflers, ADM Race CAI, 3:70 gears, lightweight wheels and nitto drag radials. Stock internal L99, stock converter.
Bolt on best before blower 12.22@113.29 w/ nothing but ARH headers, catted x-pipe, ADM CAI and a tune on stock Pzero`s! Other car 2008 C6 Ls3, z51, A6, Npp Exhaust, best bonestock pass 11.80@118.82, Number 2 on the Corvette Forums Bonestock fastest list.. |
08-25-2009, 01:26 PM | #26 |
I am the internets.
|
I'd also like to hear someone's take on this. 91 is the highest available (other than 100+ race fuel) here in California.
__________________
|
08-25-2009, 01:27 PM | #27 | |
Drives: never fast enough Join Date: Apr 2009
Location: CO
Posts: 59
|
Quote:
Also i could be the variance in the dyno. heck from airing up tires and positioning tires differently on the drum I have seen an 8 hp increase on the dyno. |
|
08-25-2009, 05:57 PM | #28 |
Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008
Location: S.W. Florida
Posts: 6,294
|
You guys are crazy. Your car quickly adjusts back to its original settings.
If you want your car to run faster, get some mods and get it tuned by a professional. That will give you real peformance gains that are permanent. |
|
|
Thread Tools | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel. | radz28 | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 2837 | 07-22-2023 09:07 AM |
LS3 engine specifications | Tran | Wiki | 3 | 10-06-2010 10:56 PM |
LS3 vs L99? | SGOS252382 | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 34 | 09-18-2010 03:55 PM |
Check your Order here | bvonscott | Camaro Price | Ordering | Tracking | Dealers Discussions | 665 | 06-29-2009 01:00 PM |
L99 engine specifications | Tran | Wiki | 0 | 10-19-2008 11:40 AM |