Weird Problem w/ L99 shifting - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

upSSman · 04-25-2014, 10:36 AM

When driving in [D] mode the shifts are very sluggish and make the car buck. I can drive it in [M] mode and shift manually using the buttons and make it react how I desire but I prefer it to shift automatically. Well on accident I realized that if you switch into [M] but you don't touch the tap-shift it will continue to shift automatically but it does so with NO BUCKING at all, just smooth shifts.

What wire/coding/tuning is responsible for controlling the shifts during [D] mode and why is that different from the automatic mode you experience in [M] mode prior to pressing a tap-shift button?

Electrical experts please help!!

CFD · 04-25-2014, 10:48 AM

The shift points and line pressure for "D and "M" are tuned seperately and can be adjusted according to your preference. From the factory "M" is tuned more aggressively than"D".

upSSman · 04-25-2014, 10:58 AM

So I should be able to tell my tuner to match the settings for "M" onto "D"? Its weird because in "D" after I got it tuned the shifts were super hard and crisp for 2 days but then after that they went back to being hesitant and awkward. I went back a couple days ago and they reset it to stock transmission tune but the problem remained. I was having this problem prior to the the tune, but since the tune put a bandaid on it for a day or two I'm puzzled.

tohper · 04-25-2014, 11:14 AM

I have never used D in mine

Sent from my DROID RAZR using Tapatalk

upSSman · 04-25-2014, 11:43 AM

I've been reading some other posts and people refer to "Sport" mode. Is that "M" without paddle shifting?

CFD · 04-25-2014, 11:57 AM

Quote:

Originally Posted by upSSman

I've been reading some other posts and people refer to "Sport" mode. Is that "M" without paddle shifting?

Yes, "M" is sport mode, why not "S" ? No clue, lol

JamesMyBoy · 04-25-2014, 12:46 PM

When I put mine in "M", "S" shows on the DIC and HUD, unless I use a paddle, then they shift to "M".

Mando2776 · 05-05-2014, 10:42 PM

Quote:

Originally Posted by upSSman

When driving in [D] mode the shifts are very sluggish and make the car buck. I can drive it in [M] mode and shift manually using the buttons and make it react how I desire but I prefer it to shift automatically. Well on accident I realized that if you switch into [M] but you don't touch the tap-shift it will continue to shift automatically but it does so with NO BUCKING at all, just smooth shifts.

What wire/coding/tuning is responsible for controlling the shifts during [D] mode and why is that different from the automatic mode you experience in [M] mode prior to pressing a tap-shift button?

Electrical experts please help!!

I believe the sluggish in “D” is caused by AFM kicking in? Or have u tuned AFM out? I personally use M gear on Sport mode, without paddles better shifting in IMO. From what I’ve read, AFM will still kick in when using “S” mode. Im Using Range v8, which disables AFM. Great product, and u get to keep your power train warranty. permagrin

04-25-2014, 10:36 AM	#1
upSSman Do what now? Drives: 2021 Wild Cherry 1LE Join Date: Feb 2014 Location: Spring, TX Posts: 107	Weird Problem w/ L99 shifting When driving in [D] mode the shifts are very sluggish and make the car buck. I can drive it in [M] mode and shift manually using the buttons and make it react how I desire but I prefer it to shift automatically. Well on accident I realized that if you switch into [M] but you don't touch the tap-shift it will continue to shift automatically but it does so with NO BUCKING at all, just smooth shifts. What wire/coding/tuning is responsible for controlling the shifts during [D] mode and why is that different from the automatic mode you experience in [M] mode prior to pressing a tap-shift button? Electrical experts please help!! __________________

04-25-2014, 10:58 AM	#3
upSSman Do what now? Drives: 2021 Wild Cherry 1LE Join Date: Feb 2014 Location: Spring, TX Posts: 107	So I should be able to tell my tuner to match the settings for "M" onto "D"? Its weird because in "D" after I got it tuned the shifts were super hard and crisp for 2 days but then after that they went back to being hesitant and awkward. I went back a couple days ago and they reset it to stock transmission tune but the problem remained. I was having this problem prior to the the tune, but since the tune put a bandaid on it for a day or two I'm puzzled. __________________

04-25-2014, 11:14 AM	#4
tohper Drives: 2010 2SS/RS Join Date: May 2013 Location: Gainesville, Texas Posts: 413 View My Garage	I have never used D in mine Sent from my DROID RAZR using Tapatalk __________________ Mods- Top Speed 3" LT headers catless, 3" Top Speed Catback, Tuned at ADM, Cold Air Inductions CAI, Elite catch can, ADM racing scoop Interior-(amber) interior dome, trunk, port custom sub box, 10" sub, 1000watt kenwood amp, sumbthump harness, CDF short shifter, epco shift knob, vitesse paddle shifters Exterior (amber)-mailslot scanner, grill illumnation kit, halos, fog halos, drl nightime harness, Rear Led bowtie. Painted Heritage grill, hex vents Body-removed stock decals had painted in inferno orange

04-25-2014, 11:43 AM	#5
upSSman Do what now? Drives: 2021 Wild Cherry 1LE Join Date: Feb 2014 Location: Spring, TX Posts: 107	I've been reading some other posts and people refer to "Sport" mode. Is that "M" without paddle shifting? __________________

04-25-2014, 12:46 PM	#7
JamesMyBoy Drives: 2014 2SS/RS Join Date: Jan 2014 Location: Eastern Nebraska Posts: 452	When I put mine in "M", "S" shows on the DIC and HUD, unless I use a paddle, then they shift to "M". __________________

04-25-2014, 10:48 AM	#2
CFD Drives: 2SS/RS L99 BLACK Join Date: Apr 2010 Location: Franklin , MA Posts: 6,696	The shift points and line pressure for "D and "M" are tuned seperately and can be adjusted according to your preference. From the factory "M" is tuned more aggressively than"D".