L99 active fuel management system - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Buick1959 · 03-16-2011, 01:01 PM

The L99 engine has an active fuel management system that drops the used cylinders from 8 to 4 under light loads. Are there any concerns out there over this AFM system? I am not a fan and plan to order an LS3 6 speed to avoid it. Would like to hear thoughts from others...

SLEDMASTER · 03-16-2011, 01:13 PM

Get the ls3 no afm. I got rid of my car because of AFM. You can buy a programer and turn it off along with your power tran warranty.

Rock-It Man · 03-16-2011, 01:21 PM

There have been several threads about sticky AFM lifters, and some people don't like the sound of the switches between 8 and 4.

I have found that as the engine breaks in, these symptoms reduce, and the A6 transmission is a pleasure to drive after 40 years of shifting cars and trucks.

But, when I was younger, driving an auto by choice was out of the question, so do what you like!

axis · 03-16-2011, 01:23 PM

Why are you worried about it? There are no adverse affects of AFM as it's encorporated into many other GM vehicles.

SGOS252382 · 03-16-2011, 04:32 PM

You can turn off AFM with a tune. But if your planning on an LS3 M6, you don't have to worry about it.

But if you would rather have an automatic, then you'll want to read up on AFM/DOD. Most of us love our automatics. The L99 A6 hauls axx with just a few basic mods. So if you do want an automatic don't let the AFM/DOD scare you away.

Darth_Emma · 03-16-2011, 04:48 PM

I had it tuned out very early on. No problems here! I love my L99.

camaro1 · 03-16-2011, 06:38 PM

first thing many l99 and truck owners do is have the afm/dod turned off,, most with no noticeable loss in fuel mileage,,

2010 SSRS · 03-16-2011, 06:40 PM

Quote:

Originally Posted by Darth_Emma

I had it tuned out very early on. No problems here! I love my L99.

+1

daveagogo1 · 03-16-2011, 06:56 PM

Quote:

Originally Posted by SGOS252382

You can turn off AFM with a tune. But if your planning on an LS3 M6, you don't have to worry about it.

But if you would rather have an automatic, then you'll want to read up on AFM/DOD. Most of us love our automatics. The L99 A6 hauls axx with just a few basic mods. So if you do want an automatic don't let the AFM/DOD scare you away.

+1 I love my L99. It is very potent and has more than enough to hang tough. One of my first mods was the CAI Inc induction and at WOT It just sounds like an angry machine begging to chew up asphalt.

y2k king · 03-16-2011, 08:57 PM

had it tuned...i bought a v8, not a part time v4. the difference is very dramatic.

CruiseControl · 03-16-2011, 09:09 PM

No problems and no tunes for me. I enjoy sipping a little less fuel on highway cruises. I also enjoy my warranty.

kmcd · 03-16-2011, 09:30 PM

You can turn off the AFM by simply changing the parameters on the stock tune if you want. I've talked to three different service managers who say this will not void your power train warranty. They know people don't like it, and the only reason it's there is so the car won't be subject to the gas guzzler tax. It's easy to do with a hand-held tuner, and your mileage won't suffer unless you plan to only drive on a perfectly flat surface without accelerating. That's how they validate the EPA mileage rating, but that's not how people drive in the real world.

1Camaro2SS · 03-16-2011, 09:45 PM

Quote:

Originally Posted by 2010 SSRS

+1

+2

shortstop4 · 03-16-2011, 11:00 PM

will tune out at 100,001 miles

03-16-2011, 01:01 PM	#1
Buick1959 Drives: '11 SS RS LS3 IOM conv Join Date: Mar 2011 Location: Long Island, New York Posts: 23	L99 active fuel management system The L99 engine has an active fuel management system that drops the used cylinders from 8 to 4 under light loads. Are there any concerns out there over this AFM system? I am not a fan and plan to order an LS3 6 speed to avoid it. Would like to hear thoughts from others...

03-16-2011, 01:23 PM	#4
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	Why are you worried about it? There are no adverse affects of AFM as it's encorporated into many other GM vehicles. __________________ 2010 Black 2SS/RS A6 Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train.

03-16-2011, 06:38 PM	#7
camaro1 Drives: 550+RWHP 2010 camaro Join Date: Sep 2007 Location: wisconsin Posts: 1,588	first thing many l99 and truck owners do is have the afm/dod turned off,, most with no noticeable loss in fuel mileage,, __________________ 415ci stroker, TVS 2300 Magnacharger, cnc heads, cam, yank ss3200 converter, Kooks long tubes, Bwoody true cold air kit, ZL1 Pump, magnaflow 3" cat-back, lowering springs,BMR control arms and tie rod bars, 3.73 gears, diff mounts, RX can, ADM fuel controller

03-16-2011, 08:57 PM	#10
y2k king Drives: 2011 ss camaro Join Date: Aug 2010 Location: spring hill, fl Posts: 1,705	had it tuned...i bought a v8, not a part time v4. the difference is very dramatic. __________________ 10/28/2010 got it

03-16-2011, 09:30 PM	#12
kmcd 1,425 hp / supercharged Drives: (2010 2SS/L99) (1999 Corvette) Join Date: Oct 2009 Location: Austin, TX Posts: 1,104	You can turn off the AFM by simply changing the parameters on the stock tune if you want. I've talked to three different service managers who say this will not void your power train warranty. They know people don't like it, and the only reason it's there is so the car won't be subject to the gas guzzler tax. It's easy to do with a hand-held tuner, and your mileage won't suffer unless you plan to only drive on a perfectly flat surface without accelerating. That's how they validate the EPA mileage rating, but that's not how people drive in the real world. __________________ "If it's too loud...well, you know the rest."

03-16-2011, 01:13 PM	#2
SLEDMASTER Drives: 2011 corvette coupe Join Date: May 2010 Location: SOUTH LOUISIANA Posts: 27 View My Garage	Get the ls3 no afm. I got rid of my car because of AFM. You can buy a programer and turn it off along with your power tran warranty.

03-16-2011, 01:21 PM	#3
Rock-It Man 376 cubic inches of fun Drives: 2023 Camaro ZL1 A10 Join Date: Jul 2010 Location: MA Posts: 4,031 View My Garage	There have been several threads about sticky AFM lifters, and some people don't like the sound of the switches between 8 and 4. I have found that as the engine breaks in, these symptoms reduce, and the A6 transmission is a pleasure to drive after 40 years of shifting cars and trucks. But, when I was younger, driving an auto by choice was out of the question, so do what you like!

03-16-2011, 04:32 PM	#5
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	You can turn off AFM with a tune. But if your planning on an LS3 M6, you don't have to worry about it. But if you would rather have an automatic, then you'll want to read up on AFM/DOD. Most of us love our automatics. The L99 A6 hauls axx with just a few basic mods. So if you do want an automatic don't let the AFM/DOD scare you away.

03-16-2011, 04:48 PM	#6
Darth_Emma Psssssssssshhhhhhhhhhhhh! Drives: under contruction Join Date: Nov 2009 Location: Marysville, Ohio Posts: 12,996 View My Garage	I had it tuned out very early on. No problems here! I love my L99.

03-16-2011, 09:09 PM	#11
CruiseControl Drives: 2010 Camaro 2SS/RS L99 Join Date: Mar 2010 Location: Edmonton, Alberta Posts: 73	No problems and no tunes for me. I enjoy sipping a little less fuel on highway cruises. I also enjoy my warranty.

03-16-2011, 11:00 PM	#14
shortstop4 Drives: '13 Summit White ZL1 M6 Join Date: Dec 2010 Location: Georgia Posts: 235 View My Garage	will tune out at 100,001 miles __________________ Cold Air Inductions Intake

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