Technical question for the tuners out there - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

GMRULZ · 08-11-2009, 11:50 AM

Actually I have 2 questions I would love to have answered. Thanks in advance!

1. I just dynoed my car and I ran it 2 times and put down 319rwhp, I removed the ECM fuse to reset the LTFT`s and it immediatly put down 327rwhp. Thats a 8rwhp increase! So my question is can this adverse learning be turned off or at the very least have the sensitivity be turned down to the point where the ECM will stop making these corrections or greatly reduce the adverse hp reaction?

2. I noticed on my graph and on other L99`s that there is a dip in power around 5250rpm and then it picks back up. Is this a result of the VVT working until 5250rpm bringing power levels higher than they would have been w/ out it, and then the VVT doesn`t funtion over 5250?

Slowhawk · 08-12-2009, 12:47 PM

The car self learns itself.Expecially with exhaust or intake mods.Sad part is the car might learn itself to less power. #1 reason to have the car tuned by a professional tuner.That won't happen.

SK360 · 08-12-2009, 01:11 PM

Fuel trims are there for a reason and I am betting you are adding fuel at WOT due to positive trims, I would be interested to see the AF graph on the first run if you have it.

GMRULZ · 08-12-2009, 07:03 PM

Thanks for the reply guys. I`m trying toget the other runs from the dyno shop.

how about an answer to the questions i posted, any idea`s?

SK360 · 08-12-2009, 11:10 PM

The only way to lessen the need for fuel trims is to get the MAF/VE Table dialed in close enough that the correction % is not huge, if you are seeing positive fuel trims then the ECM is going to add those to WOT fueling, negative trims do not get added tho

E85LSX · 08-30-2009, 08:34 PM

Quote:

Originally Posted by GMRULZ

Actually I have 2 questions I would love to have answered. Thanks in advance!

1. I just dynoed my car and I ran it 2 times and put down 319rwhp, I removed the ECM fuse to reset the LTFT`s and it immediatly put down 327rwhp. Thats a 8rwhp increase! So my question is can this adverse learning be turned off or at the very least have the sensitivity be turned down to the point where the ECM will stop making these corrections or greatly reduce the adverse hp reaction?

2. I noticed on my graph and on other L99`s that there is a dip in power around 5250rpm and then it picks back up. Is this a result of the VVT working until 5250rpm bringing power levels higher than they would have been w/ out it, and then the VVT doesn`t funtion over 5250?

1. Yes. Removing the ECM fuse will reset more than just the LTFT's. Part of the problem could have been spark related as it seems this is the problem with other L99's. Their are two main spark tables in your computer, high and low, if your engine is seeing any knock it will pull spark toward the low octane table. To turn this "adverse learning" off you can just copy the high octane table to the low octane table. Also, the LTFT's can be disabled by altering the enable temps and speeds.

2. Not sure what this is.

08-12-2009, 07:03 PM	#4
GMRULZ Drives: 2010 SS & 2008 C6 Join Date: Mar 2008 Location: VA Posts: 1,819	Thanks for the reply guys. I`m trying toget the other runs from the dyno shop. how about an answer to the questions i posted, any idea`s? __________________ 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..

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08-11-2009, 11:50 AM	#1
GMRULZ Drives: 2010 SS & 2008 C6 Join Date: Mar 2008 Location: VA Posts: 1,819	Technical question for the tuners out there Actually I have 2 questions I would love to have answered. Thanks in advance! 1. I just dynoed my car and I ran it 2 times and put down 319rwhp, I removed the ECM fuse to reset the LTFT`s and it immediatly put down 327rwhp. Thats a 8rwhp increase! So my question is can this adverse learning be turned off or at the very least have the sensitivity be turned down to the point where the ECM will stop making these corrections or greatly reduce the adverse hp reaction? 2. I noticed on my graph and on other L99`s that there is a dip in power around 5250rpm and then it picks back up. Is this a result of the VVT working until 5250rpm bringing power levels higher than they would have been w/ out it, and then the VVT doesn`t funtion over 5250? __________________ 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..

08-12-2009, 12:47 PM	#2
Slowhawk Drives: 1999 Trans Am Join Date: Jul 2009 Location: Bridgewater,Ma Posts: 2,017	The car self learns itself.Expecially with exhaust or intake mods.Sad part is the car might learn itself to less power. #1 reason to have the car tuned by a professional tuner.That won't happen.

08-12-2009, 01:11 PM	#3
SK360 Account Suspended Drives: 2005 Pontiac GTO Join Date: Jun 2009 Location: Pittsburgh, PA Posts: 591	Fuel trims are there for a reason and I am betting you are adding fuel at WOT due to positive trims, I would be interested to see the AF graph on the first run if you have it.

08-12-2009, 11:10 PM	#5
SK360 Account Suspended Drives: 2005 Pontiac GTO Join Date: Jun 2009 Location: Pittsburgh, PA Posts: 591	The only way to lessen the need for fuel trims is to get the MAF/VE Table dialed in close enough that the correction % is not huge, if you are seeing positive fuel trims then the ECM is going to add those to WOT fueling, negative trims do not get added tho