TSB 18-NA-355 - After effects

neo85 · 08-19-2020, 02:47 PM

Just recently had the 18-NA-355 service bulletin for my 17 SS A8 and noticing the transmission is acting much better but slightly different? The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB.

Other than that I am noting the exhaust isn't as loud as it used to be (can barely hear the crackles/pops even in track mode - although this could be my imagination). I am wondering if they did any tuning updates along with just the mobil 1 fluid swap?

All in all glad its shifting smoothly for now - I can at least hold off from going aftermarket for a while until the TC gives out (had the swap around 20k miles so hope I caught it early enough).

Anyone else with noticeable differences couple thousand miles out after doing the most recent TSB??

HCI2000SS · 08-19-2020, 03:07 PM

Mine seems to have slightly different shift patterns, but it was just very slight.

arpad_m · 08-19-2020, 06:09 PM

They probably set the transmission to relearn mode and it is now re-adapting to your driving style (rpm, throttle modulation).

Not sure about the exhaust noise, as far as I know that would require a calibration change, which is not part of this TSB.

ABM1SSSG3 · 08-19-2020, 08:28 PM

Quote: The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB.

Quote:Other than that I am noting the exhaust isn't as loud as it used to be (can barely hear the crackles/pops even in track mode - although this could be my imagination). I am wondering if they did any tuning updates along with just the mobil 1 fluid swap?

Seems like the converter may not be locking up, at least in 8th gear. Can't think of anything that may be causing the difference in exhaust note.
Drive the 200miles(or however many miles they told you to drive it). It may be just a relearn issue. If it doesn't change to your liking, take it back in, and voice your concerns.

SSport16 · 08-20-2020, 10:45 AM

Mine was the way, they told me the TCM was reprogrammed/reset and put back into learning mode.

neo85 · 08-20-2020, 10:49 AM

Quote:

Originally Posted by ABM1SSSG3

Quote: The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB.

Quote:Other than that I am noting the exhaust isn't as loud as it used to be (can barely hear the crackles/pops even in track mode - although this could be my imagination). I am wondering if they did any tuning updates along with just the mobil 1 fluid swap?

Seems like the converter may not be locking up, at least in 8th gear. Can't think of anything that may be causing the difference in exhaust note.
Drive the 200miles(or however many miles they told you to drive it). It may be just a relearn issue. If it doesn't change to your liking, take it back in, and voice your concerns.

One thing I was noting yesterday - the tach was stuttering back and forth at normal highway speeds on flat roads - found it interesting but no weird vibrations etc when driving. Like you said I'll drive it 200 mi and see how it feels.

neo85 · 08-24-2020, 09:05 AM

Put a good 400 miles on this weekend ( central Washington to Portland to Seattle) and no issues or shuddering - feels like new car. Now my new problem- trying to save gas lol.

08-19-2020, 02:47 PM	#1
neo85 Drives: camaro ss Join Date: Jun 2018 Location: washington Posts: 26	TSB 18-NA-355 - After effects Just recently had the 18-NA-355 service bulletin for my 17 SS A8 and noticing the transmission is acting much better but slightly different? The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB. Other than that I am noting the exhaust isn't as loud as it used to be (can barely hear the crackles/pops even in track mode - although this could be my imagination). I am wondering if they did any tuning updates along with just the mobil 1 fluid swap? All in all glad its shifting smoothly for now - I can at least hold off from going aftermarket for a while until the TC gives out (had the swap around 20k miles so hope I caught it early enough). Anyone else with noticeable differences couple thousand miles out after doing the most recent TSB??

08-19-2020, 06:09 PM	#3
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 11,616 View My Garage	They probably set the transmission to relearn mode and it is now re-adapting to your driving style (rpm, throttle modulation). Not sure about the exhaust noise, as far as I know that would require a calibration change, which is not part of this TSB. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

08-20-2020, 10:45 AM	#5
SSport16 Drives: 2016 Garnet Red Camaro 2SS Join Date: Jul 2015 Location: North Carolina Posts: 5,435	Mine was the way, they told me the TCM was reprogrammed/reset and put back into learning mode. __________________ 2SS Camaro, Garnet Red, Adrenaline Red, NPP, MRC, A8, 5 Split Spoke Bright Silver Wheels (56W) 1100 Status - 7/24/15 (Ordered) 3800 Status - 10/13/15 (Built) 6000 Status - 12/22/15 (Delivered)

08-19-2020, 03:07 PM	#2
HCI2000SS Drives: 2018 Camaro V6/RS Join Date: Nov 2018 Location: MI Posts: 1,596	Mine seems to have slightly different shift patterns, but it was just very slight.

08-19-2020, 08:28 PM	#4
ABM1SSSG3 Drives: 2017 Arctic Blue Metallic A8 SS Join Date: Mar 2017 Location: Mission Viejo SoCal Posts: 78	Quote: The shudder is gone completely which is awesome but i am noticing the RPMs are idling a bit higher around 1800-2000 rpm in 8th at 65-70 vs 1500ish prior to the TSB. Quote:Other than that I am noting the exhaust isn't as loud as it used to be (can barely hear the crackles/pops even in track mode - although this could be my imagination). I am wondering if they did any tuning updates along with just the mobil 1 fluid swap? Seems like the converter may not be locking up, at least in 8th gear. Can't think of anything that may be causing the difference in exhaust note. Drive the 200miles(or however many miles they told you to drive it). It may be just a relearn issue. If it doesn't change to your liking, take it back in, and voice your concerns.

08-24-2020, 09:05 AM	#7
neo85 Drives: camaro ss Join Date: Jun 2018 Location: washington Posts: 26	Put a good 400 miles on this weekend ( central Washington to Portland to Seattle) and no issues or shuddering - feels like new car. Now my new problem- trying to save gas lol.

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