Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel.

[dustinwe1]

Thanks for the advice and info OP!

[L99BEN]

Originally Posted by Cruuzin LV

So I'm new to the forum and just got a 45th Anniversary SS Camaro L99. Traded in a 2008 Subaru WRX that had about 5k of mods done and it was very fast. I had been looking at the Camaro SS for quite some time now and really wanted a convertible car so this was the best choice in my opion and price range. "Not a fan of the mustang cheap interior and look."
Anyway I saw this thread and figured used car with 10k miles probably had a low octane fuel in the tank at some point. Did the fuse pull left it out for about 12 hours and put them back in. No noticable change in the way the car behaved. Took the car to the drag strip here in Las Vegas and ran a 14.6 at 98mph 1/4 mile with the car in sport and the nannies turned off. Ran it again with comp mode on in sport and ran a 15sec 1/4 mile. The car has flowmaster mufflers and no other modifacations however this seemed pretty lousy to me. The launches felt really good no wheel spin. So my question is this. Has anyone every just unhooked the two connections to the ECU under the hood to reset it?

I plan on getting a K&N intake and Diablosport programmer and running again in Jan/Feb when the track is open to compair the runs but I am honestly a little disapointed with the "almost stock" 1/4 mile time I ran.

14.6 @98 does sound pretty bad but:

1. Isn't Vegas like 2000 FT above sea level?
2. You have an auto vert which is heavy (4150lbs) 300 more than the L99 coupe...
3. What was your 60ft?

[Ace1USMC]

Guys, I wanted to get your opinions/thoughts on something I'm trying... So a little background first...

I've modified my 2011 SS LS3 quite a bit. Camsahft, valve springs, pushrods, timing chain, rocker trunions, billet flywheel and twin carbon ceramic clutch discs, 1 7/8" primary LT stainless headers, no cats, 3" mandrel bent exhaust into Flowmasters, ADM twin fuel pumps and FPCM, G-Force 9" rear and axles, 4.11 gears with Trac-Loc differential, Hotchkis chassis brace, Full treatment of every BMR rear suspension arms complete with rear suspension cradle bushings, and of course, a custom tune via HP Tuners. I've done everything myself (except for the tune which was done by the best LS tuner out here in CO) in my own home garage.

I recently bought HP Tuners (the pro version) for myself, and downloaded my tune from the Vehicle Control Module. I noticed when I opened up the VCM Editor, under "Spark" there are the two spark curve maps - one pair labeled "Low Octane" and the other pair labeled "High Octane".

Now, I KNOW my car will NEVER have low octane gas put in her. I don't take my car to a dealership EVER (obviously). No one but me will EVER drive her. Not no how, not no way.

I had noticed that sometimes, my exhaust pipes would rattle a bit under very specific circumstances. It would sometimes tap the crossmember just a bit - which the knock sensors translate that metallic sound into engine knock - and them immediately go to the "Low Octane Map". I even tried dropping the cross member a bit using spacers, but with the new Hotckis Chassis Brace, the bigger 3" pipes still hit the tabs (not the cross member) every now and then.

So with that all being said, I simply copied the High Octane tables and values, and pasted them into their corresponding Low Octane tables, so both maps now are identical, and are set for "High Octane".

What are your thoughts on this? Am I flirting with disaster, or do you think that I should be ok as long as not a single drop of low octane fuel finds its way into my tank? The difference between the low octane map and the high octane map is astounding - which is why there's such a marked difference in performance that everyone can instantly feel. At some spot, it pulls out as much as 20 degrees of timing (between the modified performance tune I had and the stock low-octane map).

Opinions/thoughts?

HAPPY NEW YEAR!

BLESSINGS!
Sam

[90503]

Originally Posted by Ace1USMC

Guys, I wanted to get your opinions/thoughts on something I'm trying... So a little background first...

I've modified my 2011 SS LS3 quite a bit. Camsahft, valve springs, pushrods, timing chain, rocker trunions, billet flywheel and twin carbon ceramic clutch discs, 1 7/8" primary LT stainless headers, no cats, 3" mandrel bent exhaust into Flowmasters, ADM twin fuel pumps and FPCM, G-Force 9" rear and axles, 4.11 gears with Trac-Loc differential, Hotchkis chassis brace, Full treatment of every BMR rear suspension arms complete with rear suspension cradle bushings, and of course, a custom tune via HP Tuners. I've done everything myself (except for the tune which was done by the best LS tuner out here in CO) in my own home garage.

I recently bought HP Tuners (the pro version) for myself, and downloaded my tune from the Vehicle Control Module. I noticed when I opened up the VCM Editor, under "Spark" there are the two spark curve maps - one pair labeled "Low Octane" and the other pair labeled "High Octane".

Now, I KNOW my car will NEVER have low octane gas put in her. I don't take my car to a dealership EVER (obviously). No one but me will EVER drive her. Not no how, not no way.

I had noticed that sometimes, my exhaust pipes would rattle a bit under very specific circumstances. It would sometimes tap the crossmember just a bit - which the knock sensors translate that metallic sound into engine knock - and them immediately go to the "Low Octane Map". I even tried dropping the cross member a bit using spacers, but with the new Hotckis Chassis Brace, the bigger 3" pipes still hit the tabs (not the cross member) every now and then.

So with that all being said, I simply copied the High Octane tables and values, and pasted them into their corresponding Low Octane tables, so both maps now are identical, and are set for "High Octane".

What are your thoughts on this? Am I flirting with disaster, or do you think that I should be ok as long as not a single drop of low octane fuel finds its way into my tank? The difference between the low octane map and the high octane map is astounding - which is why there's such a marked difference in performance that everyone can instantly feel. At some spot, it pulls out as much as 20 degrees of timing (between the modified performance tune I had and the stock low-octane map).

Opinions/thoughts?

HAPPY NEW YEAR!

BLESSINGS!
Sam

I like your style...lol...Not sure, but map thing might be the same or similar to what tunes/tuners do....only "problem" for us stock types is the warranty gets voided...good luck...you might be on to something...

[Ace1USMC]

Originally Posted by 90503

I like your style...lol...Not sure, but map thing might be the same or similar to what tunes/tuners do....only "problem" for us stock types is the warranty gets voided...good luck...you might be on to something...

Thanks for your response! I thought the same thing about tuners - but what I found is that all the tuners modify just the high octane maps, and leave the low octane maps alone for the "just in case" scenario. And because of that, my car kept going to the low octane map.

On a follow-up note, I took the car out for the first time since doing it last night, and WOW! What a difference! I have been running on the low octane map for a while, and it was such a blast to drive on the big boy map!

[90503]

Originally Posted by Ace1USMC

Thanks for your response! I thought the same thing about tuners - but what I found is that all the tuners modify just the high octane maps, and leave the low octane maps alone for the "just in case" scenario. And because of that, my car kept going to the low octane map.

On a follow-up note, I took the car out for the first time since doing it last night, and WOW! What a difference! I have been running on the low octane map for a while, and it was such a blast to drive on the big boy map!

From what I've seen in this thread, most who have modified and tuned are under the belief that a fuse pull is no longer necessary...You may have dis-proved that theory...lol...

Only other thing as far as what you have done being bad, is that I sort of believe (being stock, basically) is that even with the simple fuse pull, the timing is set too high...and may cause a "knock" from that...but it is short lived as it will "learn down" as needed....

[Tampa Tuning]

I recently tuned a bone stock L99 2011 camaro with 20xxx miles on it. The owner from the start of owning the car only ran the car on 87 oct. Though this doesnt make sense to us performance minded guys, he wanted to save money on gas.

Although after tuning the L99, we had about a 7 RWHP gain on a completely bone stock camaro, the vehicle never defaulted to the low octane table. it had a good amount of knock before we started tuning, and we were able to minimize most of it, but it doesnt stay consistant with 87 octane.

Similar example. My wife drives a 2006 Chevy uplander 3900 V6. God only knows what brand fuel she fills the car with, but I can assure you it never gets filled with an octane grade above 87. Its was throwing a evap canister code, so rather than replace the evap canister, I figured Id tune the family van, and just turn off the code. I wanted to tune the van for better fuel mileage, which has differant stratigies then tuning for performance. I was able to pick up 3 more MPG city driving on the van with the new tune, cant do a heck of alot with 87 octane performance wise, but again, the family van did not default to the low octane table and originally it would pull 9 degrees of spark just driving around and at WOT.

now my wife's family van can beat the other soccer moms vans to our kids games lol.

[L99BEN]

Although after tuning the L99, we had about a 7 RWHP gain on a completely bone stock camaro, the vehicle never defaulted to the low octane table.

Are you saying that the vehicle never defaulted to the low octane table when he was running 87 or after you tuned it?

7 RWHP from a tune that's it?

[CRTZL1]

Originally Posted by L99BEN

Are you saying that the vehicle never defaulted to the low octane table when he was running 87 or after you tuned it?

7 RWHP from a tune that's it?

On a bone stock car 7 rwhp is pretty standard from a tune alone.
From my experience and the tuners I have spoke to, they claim 5-10 rwhp with just a tune...

[L99BEN]

Originally Posted by SSRS55

On a bone stock car 7 rwhp is pretty standard from a tune alone.
From my experience and the tuners I have spoke to, they claim 5-10 rwhp with just a tune...

Why would one jeopardize their warranty for 5-10 horse

I have heard however that there is nice power and torque gained under the curve as well has nice tranny and torque management improvements?

[SRT10KLLR]

Originally Posted by Cruuzin LV

http://www.camaro5.com/forums/showth...=1#post5885902

Let the verbal beatings begin.

Originally Posted by L99BEN

14.6 @98 does sound pretty bad but:

1. Isn't Vegas like 2000 FT above sea level?
2. You have an auto vert which is heavy (4150lbs) 300 more than the L99 coupe...
3. What was your 60ft?

The DA was 3009 that day so add that to the weight dissadvantage also. Who know what octane gas the previous person put in too or how he took care of it.

[Tampa Tuning]

Originally Posted by L99BEN

Are you saying that the vehicle never defaulted to the low octane table when he was running 87 or after you tuned it?

7 RWHP from a tune that's it?

Correct. We did a tranny tune and corrected spark from the high octane and fueling. We left the low octane stock in case it did default to the low, but it was reading timing from the high octane table.

[AbsoluteMayheM]

OK so tonight I pulled my 5&20 fuses. I live in Ontario and we have access to 94 octane here. I have only had the car for a few weeks (New to me Dec 21) and I have put nothing in the car but 94. I have gone through at least 2 full tanks of gas .. due to the weather other wise I might have gone through more!

The car had about a half tank of gas when I bought it. I asked the dealer about the fuel and they said it had premium which in ontario typical means 91. My Dad has an 06 SSR 6.2L and only runs 94 octane since he had it tuned. We had a few talks about fuel since I take his car to some auto shows during the summers. Anyways, I already planed to take my Camaro to get a professional performance tuning in the spring.

I knew I would be using 94, so I ran the car pretty deep into empty before my next first fill. It was really fun burning down that first new camaro owner 1/2 tank of gas!!

Tomorrow I will put the fuses back and take it out for a run. Since I am still new to the car in general, I am not likely to notice a huge difference to some long time owners. I am not much of a mechanic, more of a driver! So if anything, it will be mentally faster for me now!! I will let you know how it goes ... of course depending on the weather here in ontario.

[CRTZL1]

Originally Posted by L99BEN

Why would one jeopardize their warranty for 5-10for exampleorse

I have heard however that there is nice power and torque gained under the curve as well has nice tranny and torque management improvements?

Just cause it's 5 -10 horse doesn't mean it doesn't do other things ..for example, it reduces torque management, gives better throttle response and better shift points, it disengages fuel management in the autos and gets rid of the skip shift in the standard, it also clears check engine lights for other mods such as long tubes.... and most of all the tune incorporated with all the basic bolt ons just allows for the car to run right and to it's best potential.
So Yeah I'll throw the dam warranty in the garbage all day for all that shit, especially in a tried and true and reliable engine!!!