2010 SS slow shifts when not WOT all gears - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

MSM6928 · 03-05-2023, 12:28 PM

My son and I did an engine build up together. Heads, stage 1 TPS cam, exhaust and tune. PCM of NC did the tune for engine and trans. First time out it after build and tune, it shifted firm and quick in all gears even under light throttle. Then all of the sudden next time out, it was slow to shift between all gears and hits kinda hard when it does engage. Shifting points seem normal but just like 3 seconds in between gears. Under WOT, it shifts fast and firm. It’s just mid range throttle it acts weird. I loaded the stock trans tune and seemed to be worse so reloaded the PCM teams tune and still doing it.

Any suggestions?

Thanks

Michael

bottletalk · 03-05-2023, 01:43 PM

try posting in the tuning section but it doesn't sound like a tune issue anymore. I take it u checked the trans oil? slow acting solenoid/sticky valve?
drive the car and monitor the shift with ur tuning software, at least u can determine if the ecu has an output to shift and the action is delayed or if its shifting when the ecu calls for a shift.

pyroguy · 03-05-2023, 01:58 PM

Take it back to the shop who originally tuned it and see what they have to say.

MSM6928 · 03-05-2023, 09:02 PM

Quote:

Originally Posted by bottletalk

try posting in the tuning section but it doesn't sound like a tune issue anymore. I take it u checked the trans oil? slow acting solenoid/sticky valve?
drive the car and monitor the shift with ur tuning software, at least u can determine if the ecu has an output to shift and the action is delayed or if its shifting when the ecu calls for a shift.

Thanks. I did check and the oil level is fine. Thanks for your input.

PaulsSS · 03-05-2023, 10:03 PM

Just a guess but its probably a problem with the pressure regulator. Low line pressure will cause delayed slow shifts BUT you should be seeing a code for it pop up. I doubt its the tune. Maybe the throttle position is being reported wrong? MAF info is used to set the pressure in the trans maybe thats reporting wrong? Could be a bunch of things. Probably best to seek pro help with something like this before the trans gets hurt.

morepowerjoe · 03-06-2023, 01:58 AM

I would think that it has something to do with your adaptive pressures in the tranny tune. I would take it back to the tuner and tell him what it is doing and how you would like it to shift and make sure he resets the adaptive presets in the scanner each time he changes the pressures in the tranny tune.

MSM6928 · 03-06-2023, 05:59 AM

Ok. Thank you.

theflea42 · 03-08-2023, 07:50 PM

Sounds like you're getting some pretty good info on your problem!

Let me throw my 2 cents into the mix: Put a manual transmission in there! I guarantee it will fix your shifting issues! That monster engine probably has rediculous amounts of power already, swap transmissions and it'll have ludicrous amounts of power!

MSM6928 · 03-09-2023, 07:15 AM

Quote:

Originally Posted by theflea42

Sounds like you're getting some pretty good info on your problem!

Let me throw my 2 cents into the mix: Put a manual transmission in there! I guarantee it will fix your shifting issues! That monster engine probably has rediculous amounts of power already, swap transmissions and it'll have ludicrous amounts of power!

That’s a good idea. 😁

03-05-2023, 12:28 PM	#1
MSM6928 Drives: 2010 Camaro SS Join Date: Jun 2022 Location: Dublin, Ohio Posts: 4	2010 SS slow shifts when not WOT all gears My son and I did an engine build up together. Heads, stage 1 TPS cam, exhaust and tune. PCM of NC did the tune for engine and trans. First time out it after build and tune, it shifted firm and quick in all gears even under light throttle. Then all of the sudden next time out, it was slow to shift between all gears and hits kinda hard when it does engage. Shifting points seem normal but just like 3 seconds in between gears. Under WOT, it shifts fast and firm. It’s just mid range throttle it acts weird. I loaded the stock trans tune and seemed to be worse so reloaded the PCM teams tune and still doing it. Any suggestions? Thanks Michael

03-05-2023, 01:58 PM	#3
pyroguy Started#gottalovethatblue Drives: ABM #831 Join Date: Apr 2013 Location: TN Posts: 6,943 View My Garage	Take it back to the shop who originally tuned it and see what they have to say. __________________ '10 Camaro 2SS/RS \| Aqua Blue #831 of 3,903 \| Silver Stripes Check out my build thread

03-05-2023, 10:03 PM	#5
PaulsSS Drives: 15SS Camaro Join Date: Dec 2020 Location: US Posts: 348	Just a guess but its probably a problem with the pressure regulator. Low line pressure will cause delayed slow shifts BUT you should be seeing a code for it pop up. I doubt its the tune. Maybe the throttle position is being reported wrong? MAF info is used to set the pressure in the trans maybe thats reporting wrong? Could be a bunch of things. Probably best to seek pro help with something like this before the trans gets hurt. Last edited by PaulsSS; 03-05-2023 at 10:14 PM.

03-06-2023, 01:58 AM	#6
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,166	I would think that it has something to do with your adaptive pressures in the tranny tune. I would take it back to the tuner and tell him what it is doing and how you would like it to shift and make sure he resets the adaptive presets in the scanner each time he changes the pressures in the tranny tune. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

03-05-2023, 01:43 PM	#2
bottletalk Drives: 15 Camaro 2SS M6 Join Date: Jan 2020 Location: BC Posts: 732	try posting in the tuning section but it doesn't sound like a tune issue anymore. I take it u checked the trans oil? slow acting solenoid/sticky valve? drive the car and monitor the shift with ur tuning software, at least u can determine if the ecu has an output to shift and the action is delayed or if its shifting when the ecu calls for a shift.

03-06-2023, 05:59 AM	#7
MSM6928 Drives: 2010 Camaro SS Join Date: Jun 2022 Location: Dublin, Ohio Posts: 4	Ok. Thank you.

03-08-2023, 07:50 PM	#8
theflea42 #938 of 1524 Drives: 2013 Hot Wheels Edition Camaro Join Date: Mar 2017 Location: West Virginia Posts: 182	Sounds like you're getting some pretty good info on your problem! Let me throw my 2 cents into the mix: Put a manual transmission in there! I guarantee it will fix your shifting issues! That monster engine probably has rediculous amounts of power already, swap transmissions and it'll have ludicrous amounts of power!