What was Chevy's reason behind the L99 with automatic? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Cepak · 03-08-2015, 12:40 PM

just curious if anyone knows why Chevy put the LS3 with the stick, but used the L99 with the automatic? Why not the same engine with both manual and auto?

I did a search on this forum but couldn't find an answer.

PAUL SS · 03-08-2015, 12:41 PM

1. Fuel mileage

Rakito · 03-08-2015, 12:45 PM

from my understanding, they used the L99 because it had active fuel management, which could shut down cylinders and reduce fuel consumption, which works well with an Automatic Trans. Now with the LT1 engine doing the same thing with the 7 Speed Mans in the Corvette, I'm sure we'll see the same thing in the 6th Gen Camaro (I would love a V8 with 450 HP and do 28 MPG).

Number 3 · 03-08-2015, 12:52 PM

GM decreed there would be no GG tax on the Camaro. My SS with the LS3 and an automatic carried a $1,700 tax.

This would have put the Camaro at a HUGE disadvantage against the Mustang.

*mlee* · 03-08-2015, 12:52 PM

It kept you from having to pay a gas guzzler tax on the L99

Edit: #3 just beat me to it.

Number 3 · 03-08-2015, 01:00 PM

Quote:

Originally Posted by mlee

It kept you from having to pay a gas guzzler tax on the L99

Edit: #3 just beat me to it.

Ha haaaaaa, I win.

i2disturbedSS · 03-08-2015, 01:13 PM

Couldn't get the AFM to work well with the LS3-

1fastmf · 03-08-2015, 01:16 PM

Same reason the g8 gt came with a l76. Gas guzzler tax and cafe standards

Low Saturn · 03-08-2015, 01:21 PM

Quote:

Originally Posted by PAUL SS

1. Fuel mileage

Too bad it doesn't work the way it'sssupposed to. I get better MPG with AFM turned off.

JCunningham · 03-08-2015, 01:23 PM

i bet its because you would get a shutter with the stick cars when it went into 4cyl mode. The torque converter absorbs it on the autos. AFM is a scam. works on paper only. I dont know about the Camaros with afm but in the trucks you would get better mileage with it turned off.

Number 3 · 03-08-2015, 01:32 PM

Quote:

Originally Posted by Low Saturn

Too bad it doesn't work the way it'sssupposed to. I get better MPG with AFM turned off.

It works the way it's supposed to. It avoids the GG tax.

Real world is another story. But just think about what you posted.

You are saying you get better mpg when all 8 injectors are pumping fuel than when only 4 of them do.

You are reporting, shall I say, non scientific anecdotal results. So I would agree sometimes under certain conditions you could do better. But if you drove the EPA cycle the way it's driven, nope.

Number 3 · 03-08-2015, 01:33 PM

Quote:

Originally Posted by JCunningham

i bet its because you would get a shutter with the stick cars when it went into 4cyl mode. The torque converter absorbs it on the autos. AFM is a scam. works on paper only. I dont know about the Camaros with afm but in the trucks you would get better mileage with it turned off.

Sorry, but no. The government reports otherwise.

Also not sure how you guys are reporting, "with it turned off". You can't turn it off on the Camaro or FST. On the C7 I believe you can deselect ECO mode.

JCunningham · 03-08-2015, 01:36 PM

sorry but no my truck reports otherwise and low saturn's car reports otherwise. and many other people have the same results.

*mlee* · 03-08-2015, 01:37 PM

Quote:

Originally Posted by JCunningham

i bet its because you would get a shutter with the stick cars when it went into 4cyl mode. The torque converter absorbs it on the autos. AFM is a scam. works on paper only. I dont know about the Camaros with afm but in the trucks you would get better mileage with it turned off.

I've got it in my Tahoe and 2 Camaros and the only way it gets better MPG turned off is with a tune. And most are tuning at the same time they turn it off.

03-08-2015, 12:40 PM	#1
Cepak Purchase Date 2/17/2015 Drives: none Join Date: Feb 2015 Location: none Posts: 47	What was Chevy's reason behind the L99 with automatic? just curious if anyone knows why Chevy put the LS3 with the stick, but used the L99 with the automatic? Why not the same engine with both manual and auto? I did a search on this forum but couldn't find an answer. __________________ none

03-08-2015, 12:41 PM	#2
PAUL SS The Mark of Excellence Drives: 2010 ABM 1SS RS LS3 Join Date: Jan 2009 Location: Smallest State in the Union Posts: 8,690 View My Garage	1. Fuel mileage __________________ BMR, CAI, DynoMax, Elite Eng., Hurst, Jannetty, Clear Image Headers & Hi Flow cats, Jet Hot, LSR, TSW, VMax, Vredestein

03-08-2015, 12:52 PM	#4
Number 3 Hail to the King baby! Drives: '19 XT4 2.0T & '22 VW Atlas 2.0T Join Date: Dec 2008 Location: Illinois Posts: 12,184 View My Garage	GM decreed there would be no GG tax on the Camaro. My SS with the LS3 and an automatic carried a $1,700 tax. This would have put the Camaro at a HUGE disadvantage against the Mustang. __________________ "Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley

03-08-2015, 12:52 PM	#5
mlee CamaroFans.com Drives: ZLE & ZR2 Join Date: Oct 2008 Location: Conroe, TX Posts: 37,527 View My Garage	It kept you from having to pay a gas guzzler tax on the L99 Edit: #3 just beat me to it. __________________

03-08-2015, 01:13 PM	#7
i2disturbedSS Drives: 2010 SS L99 IOM Join Date: Aug 2012 Location: CA Posts: 1,923	Couldn't get the AFM to work well with the LS3- __________________ 369rwhp/392rwtq "Spending money I don't have, to buy parts I don't need, to impress people I don't know!" -Jenkins

03-08-2015, 12:45 PM	#3
Rakito Thunderfury Drives: 2013 Dusk Edition 2SS M6 1/205 Join Date: Mar 2014 Location: Matthews, NC Posts: 93 View My Garage	from my understanding, they used the L99 because it had active fuel management, which could shut down cylinders and reduce fuel consumption, which works well with an Automatic Trans. Now with the LT1 engine doing the same thing with the 7 Speed Mans in the Corvette, I'm sure we'll see the same thing in the 6th Gen Camaro (I would love a V8 with 450 HP and do 28 MPG). __________________ Current Car: 2013 Dusk Edition 2SS/RS M6 1 of 205!!! CAI Intake, GM Perf Exhaust, RX Catch Can "Thunderfury" Old Car: "Blu Bee" 2011 Camaro LS Imperial Blue HURST Short-Throw M6 --You will be missed good buddy--

03-08-2015, 01:16 PM	#8
1fastmf Drives: SBM G8 Gt Join Date: Jan 2014 Location: Chicago Posts: 206	Same reason the g8 gt came with a l76. Gas guzzler tax and cafe standards

03-08-2015, 01:23 PM	#10
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	i bet its because you would get a shutter with the stick cars when it went into 4cyl mode. The torque converter absorbs it on the autos. AFM is a scam. works on paper only. I dont know about the Camaros with afm but in the trucks you would get better mileage with it turned off. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1

03-08-2015, 01:36 PM	#13
JCunningham Drives: 2017 2SS M6 Join Date: Jun 2013 Location: WNY Posts: 7,070	sorry but no my truck reports otherwise and low saturn's car reports otherwise. and many other people have the same results. __________________ real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1