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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 01-27-2011, 06:48 AM   #1
brantley847
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L99 lag

I am new to the moding group and trying to educate myself on the camaro through C5...it has been a blast thanks to the help of all the users here...

But I gotta ask....I know this has been addressed that the L99 lag does exist, but what the hell causes it? When I first noticed it I thought there was an issue with my transmission (I know I am setting myself up for the "the only issue with the tranny is the L99 comments)....however, I noticed previous posts on here stated they were experiencing the same lag or occasional "hop". I only notice a hop, jolt, or any type of lag when I am accelerating at a slow rate during rush hour.

Is this an AFM issue and what is the easiest solution? Tune or additional mods? I will be purchasing LTs and CAI within the next few months...

I hate to say I "regret" going A6, because I don't..it was the most sensible option living in a well populated area of Orlando.
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Old 01-27-2011, 07:07 AM   #2
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well almost every automatic transmission i have driven, has some type of lag. i think its just the automatic transmission and its normal. have you done a fuse pull?

anyways the AFM issue is only a issue when you have an exhaust and you can hear your car turn off 4 pistons at cursing. its sounds really bad from what i have heard.

when you get your CAI and headers make sure you get a tune. and you can will dive allot better all around.
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Old 01-27-2011, 07:49 AM   #3
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Nah, I haven't done that yet, figured it wouldn't be necessary for the 2011, but I may have to give that a try.

When I accelerate a modest or steady rate no lag is present and it is very smooth. It is only when I am babying the vehicle because it is bumper to bumper to a feel a quick chop.
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2011 2SS/RS
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Appearance:Smoked side markers and black bowties. Blk / Blue Carbon Fiber interior trim.

Next in order: F14s, 3.70 gears, DSS Axles, End links/Toe rods/trailing arms, Ported heads, S/C.







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Old 01-27-2011, 07:55 AM   #4
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The VMax CNC Spiral ported TB does a ton to improve the throttle response and driveability.
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Old 01-27-2011, 07:59 AM   #5
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The VMax CNC Spiral ported TB does a ton to improve the throttle response and driveability.
Would an intake and/or headers help at all? I got some gift cert for kooks, so I am trying to use that first....obviously I plan on getting a tune done once those are installed...
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Appearance:Smoked side markers and black bowties. Blk / Blue Carbon Fiber interior trim.

Next in order: F14s, 3.70 gears, DSS Axles, End links/Toe rods/trailing arms, Ported heads, S/C.







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Old 01-27-2011, 08:12 AM   #6
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Quote:
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Would an intake and/or headers help at all? I got some gift cert for kooks, so I am trying to use that first....obviously I plan on getting a tune done once those are installed...
No on intake and headers, but the tune part will fix you up...
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Old 01-27-2011, 10:31 AM   #7
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I have a tuned 2011 SS and have yet to find a good tuner to resolve the lag. I absolutely HATE local driving or driving in traffic. I have to constantly slowly roll into the throttle to allow the tranny to play catch-up.

Last night I was coming up to a red light, before coming to a complete stop the light turned green so I hit the throttle too fast. When it caught the gear It felt like someone slammed into me.
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Old 01-27-2011, 10:56 AM   #8
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Originally Posted by Quartermile View Post
I have a tuned 2011 SS and have yet to find a good tuner to resolve the lag. I absolutely HATE local driving or driving in traffic. I have to constantly slowly roll into the throttle to allow the tranny to play catch-up.

Last night I was coming up to a red light, before coming to a complete stop the light turned green so I hit the throttle too fast. When it caught the gear It felt like someone slammed into me.
Yikes... are you sure the tranny got tuned along w/ your engine? If so that's NOT the way it's supposed to work...
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Old 01-27-2011, 11:16 AM   #9
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Ya mine doesn't do anything like that.
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Old 01-27-2011, 11:48 AM   #10
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Yikes... are you sure the tranny got tuned along w/ you engine? If so that's NOT the way it's supposed to work...
Yup, the tranny was tuned but I still didn't like the way it was shifting. It was a bit to agressive. It was great on the track but not for local driving. Right now the tune I'm using is the bone stock shifting points with the AFM delete.
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Old 01-27-2011, 11:54 AM   #11
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I get a bit of delay before the car downshifts sometimes but not really anything that bugs me too much. The only time I really notice it is when I make a right turn. I either dont get the acceleration I wanted when I first hit the gas, or I end up hitting it harder than I realized since it did not grab right away.
None of that is AFM related, AFM would not likely be engaged at such a slow speed anyway.
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Old 01-27-2011, 01:27 PM   #12
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After I installed my Vararam intake, I noticed a BIG
improvement in lag. It's still present slightly when
flooring it fro stop or a slow role, but is virtually
gone when flooring it from a higher rate of speed.
I can't wait until I add a nice ported TB.
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Old 01-27-2011, 01:30 PM   #13
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I thought it had to do with traction control.
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Old 01-27-2011, 01:32 PM   #14
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I thought it had to do with traction control.
Not sure how TC would be involved at slower speeds.. plus I've had mine off (as far off as it gets anyway) and did not notice any change in behavior of the transmission.
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Old 01-27-2011, 02:12 PM   #15
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Quote:
Originally Posted by Quartermile View Post
Yup, the tranny was tuned but I still didn't like the way it was shifting. It was a bit to agressive. It was great on the track but not for local driving. Right now the tune I'm using is the bone stock shifting points with the AFM delete.
Sounds like you need to take it back again... Each Gear in both D and M upshift and downshift can be adjusted. You should have zero lag and still drive smooth around town.

Before I was tuned I could feel and even more so "hear" the lag. It's totally gone now and I barely feel the shifts... In fact my downshifts are probably more firm than upshifts.

Sometimes the tranny work takes some adjusting if your tuner hasn't done a bunch of them. Normally they nail down a good tune and copy/paste it to the next one.
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Old 01-27-2011, 02:19 PM   #16
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Quote:
Originally Posted by Quartermile View Post
I have a tuned 2011 SS and have yet to find a good tuner to resolve the lag. I absolutely HATE local driving or driving in traffic. I have to constantly slowly roll into the throttle to allow the tranny to play catch-up.

Last night I was coming up to a red light, before coming to a complete stop the light turned green so I hit the throttle too fast. When it caught the gear It felt like someone slammed into me.
Good Lord...I don't get thrown around like a pinball, but damn lol.

It does happen at the same times for me as well. Usually it is between 10-30 mph when slowing or babying the throttle. It is odd because it feels like the car wants to GO and is being held down.... buuuuuuuuut it also feels alot like my truck did when the transmission went to apple sauce. So I freaked at first thinking my biffel was having issues, did some research and noticed it is common among the A6 and users on this forum. I am shocked your tune didn't resolve the issue however...

Quote:
Originally Posted by mlee View Post
Before I was tuned I could feel and even more so "hear" the lag.
EXACTLY
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Appearance:Smoked side markers and black bowties. Blk / Blue Carbon Fiber interior trim.

Next in order: F14s, 3.70 gears, DSS Axles, End links/Toe rods/trailing arms, Ported heads, S/C.







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Old 01-27-2011, 02:27 PM   #17
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It's the AFM...

In a normal, auto car there's always that split second delay between the time you hit the gas and the time the powers arrives, because most auto cars go striaght to their highest gear under a light load and need to downshift when you get on the gas.

The AFM just adds one more step to the process of power delivery. In the L99, you have to wait not only for the downshift, but for the AFM to deactivate as well. Thus, lag.

I'd say tune out the AFM, or try driving around in "M" mode This will at least allow you to control your gearing, and eliminate the downshift lag...
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Old 01-27-2011, 03:21 PM   #18
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Not sure how TC would be involved at slower speeds.. plus I've had mine off (as far off as it gets anyway) and did not notice any change in behavior of the transmission.
I haven't presonally driven an L99, but that was my understanding. I'm probably wrong though.
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Old 01-27-2011, 03:27 PM   #19
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I have the same problem when going easy on the throttle as others have said. But, I do not remember if it acts the same way in M as it does it D. I'll try that out later tonight to see what happens!
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Old 01-27-2011, 03:33 PM   #20
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I have the same problem when going easy on the throttle as others have said. But, I do not remember if it acts the same way in M as it does it D. I'll try that out later tonight to see what happens!
"it seems" that it is not nearly as bad in M if you run in sport mode WITHOUT the paddle shifters.. Like Revo said, if you ARE using the shifters you should be able to avoid it almost completely.
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Appearance:Smoked side markers and black bowties. Blk / Blue Carbon Fiber interior trim.

Next in order: F14s, 3.70 gears, DSS Axles, End links/Toe rods/trailing arms, Ported heads, S/C.







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Old 01-27-2011, 03:34 PM   #21
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I have the same problem when going easy on the throttle as others have said. But, I do not remember if it acts the same way in M as it does it D. I'll try that out later tonight to see what happens!
Same in either M or D...
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Old 01-27-2011, 03:34 PM   #22
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"it seems" that it is not nearly as bad in M if you run in sport mode WITHOUT the paddle shifters.. Like Revo said, if you ARE using the shifters you should be able to avoid it almost completely.
Agreed, it is better in "S" mode but not completely gone.
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Old 01-27-2011, 04:23 PM   #23
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Can a tune be made specifically for "M" mode thus leaving "D" mode the way it came from the factory?
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Old 01-27-2011, 04:50 PM   #24
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Can a tune be made specifically for "M" mode thus leaving "D" mode the way it came from the factory?
i got the tranny tune and haven't bothered with the paddles since.
i just can't believe the difference in the smooth operation after the tune.
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Old 01-27-2011, 04:58 PM   #25
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i got the tranny tune and haven't bothered with the paddles since.
i just can't believe the difference in the smooth operation after the tune.
thats what i was thinking. i don't have a auto thats why i didn't say anything. but with a tune shouldn't that car drive smoother ?
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