09-14-2010, 08:12 AM | #1 |
Motorhead Wannabe
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AFM Tuned Out, Gas Mileage?
To those with an L99 & that have had the AFM tuned out. How bad has this affected your gas mileage?
I have had my 2SS L99 for 2 1/2 weeks & am considering CAI, Headers & exhaust mods, but after reading about all the AFM drone issues am really considering the AFM delete. Currently with 2200 miles on the car I am averaging 20MPG (combined). So how far can I expect that to drop? 2nd question, Is there anyway to set-up the AFM Tune-out to activate it at will (select AFM On or Off while driving)? It would be good to have it available for long trips, etc. Thanks!
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2011 2SS/RS L99 RJT VIN# 116938 Del: 27AUG2010 "Veronica" is a wet dream on wheels! Former Ride: 2010 1LT RJT 15AUG2009 - 27AUG2010 "Victoria" was one fine lady! CamaroSouth - Columbia Chapter Member |
09-14-2010, 08:48 AM | #2 |
v It bites.
Drives: 2011 IBM 2SS/RS Join Date: May 2008
Location: Orlando, FL
Posts: 3,585
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I just bought a borla S type and I am waiting to see how the AFM really affects it before I make that jump...
However, almost EVERYONE I have talked to on here..actually said they had a MPG increase after tuning out. I don't know how that is possible, but my guess is most of them have mods like headers, CAI, tune, exhaust and are getting their improved MPGs from those products. The tune I am sure gives back what you lose honestly...
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2011 2SS/RS
Performance: 439 RWHP: 226/236 Comp Cam, Kooks 1-7/8, CAInc, Borla S type, Vmax TB, Rx Catch Can, Trans cooler, SLP 160 termo, Melling high volume, Eibach Springs/Sways 1" drop, Whiteline complete bushing kit. |
09-14-2010, 09:16 AM | #3 | |
100% Chevy & Harley Man
Drives: 2010 2SS: Blown LSX 376-B15 Join Date: Feb 2009
Location: Eldersburg,MD
Posts: 2,211
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Quote:
As far as I know, you can not have an on/off switch for this function. But never say never. AFM is a bonus if you do alot of long distance/highway driving. Otherwise, it doesn't activate.
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LSX 376-B15, TVS2300 SC, Harland Sharp Rockers w/ Trunion Bearings, ATI Balancer/keyed, AR LT Headers/Borla Catback Exhaust, DSS 1400 HP Axles, DSS aluminum driveshaft, 3.70, Hotchkis Springs/Sway bars, Forgeline SO3P Aluminum Wheels (20x9.5 F/20x11 R)w/ Hidden Titanium Hardware, Nitto NT05 Tires (27540ZR20 F/31535ZR20 R), Billet LPE brake/gas pedals, Escort 9500ci Radar Detector Laser Jammer, Roto Fab CAI with Ice Silver box, Carbon fiber tube/MAF Housing Assy, LPE Aluminum coil covers, SS9 Sleeper Fiber Glass Hood (ACS), Carbotech 1521 ceramic brake pads, Elite catch can.
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09-14-2010, 10:53 AM | #4 | |
v It bites.
Drives: 2011 IBM 2SS/RS Join Date: May 2008
Location: Orlando, FL
Posts: 3,585
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Quote:
There is no option to turn AFM on or off at will...(at least it has not been created yet..lol) AFM turns on ALL THE TIME. It is almost annoying...i was under the impression it was highway driving only. Apparently this is not the case and has a mind of its own. You could be cruising at 40-50 mph on a smaller state road and it comes on. If anyone intends to keep their stock system (which is a great system if you prefer the quieter hum) because it runs quiet and smooth on the interstate. However, I don't interstate drive very often so I wanted some gurgle...this is when anyone who has purchased aftermarket realizes AFM turns on anywhere at anytime as long as the RPM levels present itself. However, you can avoid this by utilizing the paddle shifters and keeping the RPM out of that range where the AFM kicks on...personally, my music is loud as hell at most given times so I avoid noticing drone...we will see how the Borla does for me with AFM in the next few months
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2011 2SS/RS
Performance: 439 RWHP: 226/236 Comp Cam, Kooks 1-7/8, CAInc, Borla S type, Vmax TB, Rx Catch Can, Trans cooler, SLP 160 termo, Melling high volume, Eibach Springs/Sways 1" drop, Whiteline complete bushing kit. |
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09-14-2010, 11:15 AM | #5 |
Well, I've got Pacesetter long tube headers, SLP Catback, Diablosport Trinity programmer, CAI and as long as I'm not romping on it my gas mileage hasnt changed much, Now it's very hard not to play
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09-15-2010, 10:32 PM | #6 |
Drives: 1SSRS RY L99 Join Date: Aug 2009
Location: Ontario
Posts: 1,329
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I think someone said with a diablo tuner you can set AFM to only come on when in certain gears. They had it programmed to only come on in 5 and 6th, so the sound was ok most of the time.
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09-16-2010, 05:13 AM | #7 |
Drives: SuperSport's Join Date: May 2009
Location: Michigan
Posts: 382
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Im sorry to be a dick but who cares about miles per gallon, you bought a SS camaro not a ford Fiesta. When the tank is empty fill it, you obviously have a good job to have an SS camaro ($35k+) so just do the mods and don't look back !!!
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2002 Chevy CamaroSS MN6
'08 Chevy TBSS AWD "DD" Plans : 2013 CamaroSS 1LE |
09-16-2010, 08:42 AM | #8 | |
Psssssssssshhhhhhhhhhhhh!
Drives: under contruction Join Date: Nov 2009
Location: Marysville, Ohio
Posts: 12,996
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Quote:
I have headers, cai, full exhaust, and a tune. (I also added a supercharger this week, but I haven't gotten it back from the shop yet, so I can't comment on that). When the headers went on and I got the first tune, I had AFM tuned out and my fuel economy improved because of the tune. The car runs much more efficiently with a good tune. Your car will have more power at the same rpms so it will use less gas. A tuner can program you car so that when you're in D the car behaves one way, for example you might want it to be similar to how it drives when stock. I think they should be able to leave AFM on when in D. Then they can create a different tune for M mode (a more sport tune for example) and turn AFM off when in M. You'd need to ask your tuner for sure, but I don't see why not. IMHO, just turn off AFM! I think it is just a gimmick by GM to get past the gas guzzler tax and actually does very little if anything to improve overall fuel economy. The biggest factor that will affect your fuel economy is the weight of your right foot on that long pedal on the right. |
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09-16-2010, 08:46 AM | #9 |
Drives: 2010 IBM Camaro SS Join Date: Jun 2007
Location: DFW, Tx
Posts: 1,157
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I'd love to tune out AFM but I'm not willing to risk warranty issues right now. Considering that when I'm driving, even when maintaining speed I can hear/feel the AFM kick on and off constantly as I roll down the road I dont see how it is saving enough fuel to even account for 1 mpg.
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2010 Camaro SS Imperial Blue | CAI Inc, CAI | Solo Hi Flow Cats | X-Pipe | Backup Camera | PDIM
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09-16-2010, 09:04 AM | #10 | |
CamaroFans.com
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Quote:
I did plenty of tests on and off and you DO lose ~3mpg in mixed driving. Since most people turn off AFM at the same time they are tuning it's basically a wash. The tune alone will get you some nice MPG gains and you lose it back by turning off AFM. |
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09-16-2010, 10:10 AM | #11 | |
Drives: Transformers Edition Camaro 2SS/RS Join Date: Jan 2010
Location: Mass
Posts: 1,048
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AFM Tuning ??
Quote:
The vacuum tables look more slightly more complicated to me because they are numbers I can't relate to, but the RPMs are easy be understood. So if you wanted to keep your AFM you could just tune out the areas that bother you like say at a certain RPM in a certain gear or the more complicated way at a certain vacuum at a certain RPM at a certain gear. You could also change the range of the whole thing to say between 675-1500 RPMs or 675-1100 RPMs and still keep it. That way it would only activate mostly when you are off the throttle. AMF used to bug me, but it doesn't anymore. When it did it was usually on a back road around 30-35 MPH. So if I figured out what gear I was in and what RPMs I could just lower the RPM factor for that gear..
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09-16-2010, 10:19 AM | #12 |
CamaroFans.com
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I looked through the RPM ranges and just decided doing it gear by gear was best. RPMs are set at a good range anyway.
5th and 6th gear has worked well and I don't even notice AFM anymore. Like you said... 30-35 mph or slow speeds is where it is annoying to turning if off in the low gears works great. |
09-16-2010, 04:26 PM | #13 |
Drives: 1985 IROC, 2011 Camaro Join Date: Oct 2008
Location: Lemont, IL
Posts: 284
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I tuned mine to only come on in 5th and 6th gear and made it more agressive. I get 4mpg more on the highway vs it off and its not annoying or noticeable. anyone who says they gain by turning it off is full of it.
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09-16-2010, 05:45 PM | #14 |
Hail to the King baby!
Drives: '19 XT4 2.0T & '22 VW Atlas 2.0T Join Date: Dec 2008
Location: Illinois
Posts: 12,214
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FYI the exhaust drone is made much worse with the aftermarket exhaust. The stock exhaust on the L99 has several flex couplings that are specially engineered to isolate the exhaust from the body when the 4 cylinderodes are present. The after market systems don't have these so you feel and hear much more.
I understand that late 2010 cars had an enhancement to the flex couplings to improve NVH
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