Active fuel management question - ModernCamaro.com - 5th Generation Camaro Enthusiasts
V8 Engine Discussion 6.2L LS3/L99 V8 | Exhaust | Ignition | Induction | Intakes

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post #1 of 15 Old 03-27-2015, 08:18 PM Thread Starter
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Active fuel management question

Hello all,
the AFM seems more noticeable on our '15 L99 than on the '14 L99.
At 45-55 mph cruising and then just touching the gas, i can feel it go from 4 to 8 cyl.
There is throttle lag and slight vibration as well as a sound difference during the transition.
Are some cars more noticeable with this condition than others or is it something else?

Thanks,
Bob


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post #2 of 15 Old 03-28-2015, 07:58 AM
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All are like this....very easy to tune out if it annoy's (does me). The fuel economy gain is negligible and I hate the feel and sound.

Contact Phil at Tampa Tuning (supporting vendor here) and he can hook you up if you dont have a good tuner near you.
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post #3 of 15 Old 03-28-2015, 08:29 AM
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If you're stock and don't want to do all that vendor tuning which potentially could void your warranty (if you care about that), try a Range AFM disabler.

v8 – Range Technology | AFM Solutions for GM Cars, Trucks & SUVs

Plugs in the diagnostic port under the dash. I have one in my GMC truck and it's great. Nice thing is, I can pull it out of the truck and plug it into my 2010 L99 Camaro if I want. All it does is make the car think it doesn't need to go to V4 mode. Ever.

There have been a few glitches when people with 2012-up cars, but nothing that would damage the car. Things like having to unplug it, start the car, then plug it back in.

Nice thing is, if you have issues with it, Range Technologies has pretty good customer service from what I've read. They've helped out folks that had the glitches. Not sure if they've corrected them in their products yet. For my 2010, never had an issue with it yet.


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post #4 of 15 Old 03-28-2015, 08:55 AM
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I love my Range AFM Killer, however there are two things to remember when you own and use one.

1. Never leave it plugged into the car if you leave the car for more than three days....it will drain the battery and it might not start. (like going on a trip from the airport)

2. If you receive OnStar reports each month, you must remember to unplug the Range unit two days before the scheduled report or else you will get nothing from OnStar. The diagnostics will not complete with this unit installed.


Just a friendly reminder learned from my experience.
JW


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post #5 of 15 Old 03-28-2015, 09:25 AM
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Good points. I don't have OhCrapStar activated on either the truck or the 2010 so I don't care.

I have left my Range in the GMC for over a week at a time without starting and no issues. Starts right up. But the battery drain potential is another watch out I've heard about. But it's easy to do to unplug it.

Again, the right way to do it is get a tune, but sometimes you want to keep your warranty intact without rolling the dice.

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post #6 of 15 Old 03-28-2015, 09:30 PM Thread Starter
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Yes AFM is annoying, would have been nice had GM found another way to pull another 1-2 mpg out of it without afm.

Still love this car, it's pretty impressive - power, handling, braking, looks. We receive many compliments on it.

I don't want to take a chance with the warranty so i may go with the Range. I know some things about it, most seem happy with it.
I will check into it further using it on this '15. Sometimes the car does sit for a while, i would probably unplug it in that situation.

Thanks to all for the replies and advice.

Bob
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post #7 of 15 Old 03-29-2015, 05:28 AM
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I guess I'm just not sensitive to this ... how do you tell?

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post #8 of 15 Old 03-29-2015, 05:30 PM Thread Starter
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I found cruising at 45-55 mph on a flat stretch of road and then Slightly touching the gas to accelerate i can feel the switch from 4-8. Slight throttle lag along with slight vibration accompanied by a change in sound is the way i can describe it.
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post #9 of 15 Old 03-29-2015, 06:16 PM
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Quote:
Originally Posted by 427cubicinches View Post
I found cruising at 45-55 mph on a flat stretch of road and then Slightly touching the gas to accelerate i can feel the switch from 4-8. Slight throttle lag along with slight vibration accompanied by a change in sound is the way i can describe it.
I'll have to give it a try ... maybe because I drive so many hills or at higher speeds when any where near flat is why I haven't noticed. Thanks

2012 2SS / RS CRT; Additional Options: Highwing Spoiler, Sunroof, Window Tint, Splash Guards, Wheels, Nitro, Heritage Grill, MRT Louvers, Ported Throttle Body, Cold Air Inductions CAI, RX Sport Hood, someone's splitter, River City Strut Bar
Born On: 13 April 2012; Purchased: 27 August 2012
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post #10 of 15 Old 03-31-2015, 11:55 AM
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Quote:
Originally Posted by JWD621 View Post
I love my Range AFM Killer, however there are two things to remember when you own and use one.

1. Never leave it plugged into the car if you leave the car for more than three days....it will drain the battery and it might not start. (like going on a trip from the airport)

2. If you receive OnStar reports each month, you must remember to unplug the Range unit two days before the scheduled report or else you will get nothing from OnStar. The diagnostics will not complete with this unit installed.


Just a friendly reminder learned from my experience.
JW
for the Range AFM delete option. I recently took the Camaro over the mountain to Spokane and back. Got 22 MPG with the Range plugged in and AFM was a distant memory the entire trip.


Who knew the fountain of youth came with 400+ HP!
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