AFM L99 - 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 22 Old 03-23-2009, 11:53 AM Thread Starter
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AFM L99

Will the L99 have the ability to switch it to a constant 8 cylinder mode? If not, what happens when you do a hole shot? Is there any hessitation when going from 4 to 8 cylinder mode?
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post #2 of 22 Old 03-23-2009, 12:08 PM
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Just ask anyone who has an LS4 Monte, Impala, GCP of Lacross Super. There is no hesitation. I've had a LS4 Monte Carlo for almost 3 years, and I don't feel a hesitation under most circumstatnces. The only time I do is if I'm messing with the throttle on/off.

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post #3 of 22 Old 03-23-2009, 01:20 PM
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I have often wondered the same thing dan
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post #4 of 22 Old 03-23-2009, 02:38 PM
 
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Yes. Through tuning the AFM can be deleted.

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post #5 of 22 Old 03-23-2009, 03:23 PM
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Howard, it is possible to turn it all the way off? Wow, I was not aware of that. That's cool.

Personally I would like to turn it UP a bit.
Supposedly you can turn it up from 5% to 11% (meaning % of engine load needed for AFM to disengage) and gain 2-3MPG.
And supposedly this can be done in conjunction with a looking-for-more-horsepower tune.

I don't know these things to be fact, but going off what I've heard......

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post #6 of 22 Old 03-23-2009, 03:31 PM
 
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AFM is completely adjustable. It is based upon engine rpm, manifold pressure and gear. We have played it with a bit on the trucks but its kind of querky.

There is a paramater to turn it completely off.

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post #7 of 22 Old 03-23-2009, 03:57 PM
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very interesting!



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post #8 of 22 Old 03-23-2009, 05:03 PM
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For those asking about detecting the switch between 4 cylinders and 8 cylinders, it becomes more apparent with aftermarket exhaust through a noticeable change in tone. When cam/heads are added to the equation, it becomes easier to tell through slight 'surges' when applying more throttle at cruising speed, depending on throttle position and engine load.

AFM will not function (or I should say intervene) when in WOT or when in Manual Tap-Shift mode.

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post #9 of 22 Old 03-23-2009, 05:58 PM
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Great insight.

Thanks!

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post #10 of 22 Old 03-23-2009, 09:13 PM
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By Turning it off do you still have a L99 or basically a LS3 ?
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