Dip in power at higher rpms - Page 2

arpad_m · 05-27-2018, 09:36 PM

This is a bit of a stab in the dark, as I have the SS and don't know how severe the dip is in your case, but I recall a thread here about the LT4 wire harness rubbing and temporarily shorting wires, which may cause intermittent power reduction at high RPM's. There is an associated TSB as well. Still searching for the thread, perhaps someone with a ZL1 can beat me to it.

collinms · 05-31-2018, 09:34 AM

I did a little some more testing on this yesterday and I think I narrowed it down to being in manual mode. I don't think it dips in power when leaving it in D. I will do more testing though. I think it's TQ management. I will try different gas next go round as well.

barnesbr · 05-31-2018, 08:28 PM

I noticed the exact same thing today coming home from work. I was downshifting with the paddles to pass cars in 3rd and it almost seemed like it skipped a tooth in the rear end. Of course, that’s not the case and there was no noise associated, that is just the best way I can explain the feeling. I pushed the shifter back over to “D” and it wouldn’t do it again. Strange.

ninetres · 05-31-2018, 10:35 PM

No felt power dips here, or on the dyno graph......outside of the car going into cat over temp and going extra rich.

collinms · 05-31-2018, 11:10 PM

Quote:

Originally Posted by barnesbr

I noticed the exact same thing today coming home from work. I was downshifting with the paddles to pass cars in 3rd and it almost seemed like it skipped a tooth in the rear end. Of course, that’s not the case and there was no noise associated, that is just the best way I can explain the feeling. I pushed the shifter back over to “D” and it wouldn’t do it again. Strange.

Maybe it's a 3rd gear quirk, I'll do more testing on this if it would ever stop storming here. I think I noticed it in third gear as well.

barnesbr · 06-01-2018, 06:52 AM

Quote:

Originally Posted by collinms

Maybe it's a 3rd gear quirk, I'll do more testing on this if it would ever stop storming here. I think I noticed it in third gear as well.

Yeah, I’m in Florida so we’re getting all the rain too. Unfortunately my other DD is a motorcycle so that doesn’t help 😂

7WSM · 06-01-2018, 07:25 AM

Mine has done this 1 time on the 3-4 shift at the track. I am almost sure it has something to do with the factory PTM that is causing it to pull power for that split second.

GarnetRedJuan · 06-01-2018, 01:52 PM

Mine does this on long freeway pulls usually in 3rd or 4th gear. it feels like a hiccup from timing being pulled or Torque management or traction control. Its usually when its seen a pull or 2 before and its seeing warmer IAT's.

I chalk it up to a combination of crappy 91 fuel in CA and extra heat from performance driving.

05-27-2018, 09:36 PM	#15
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,476 View My Garage	This is a bit of a stab in the dark, as I have the SS and don't know how severe the dip is in your case, but I recall a thread here about the LT4 wire harness rubbing and temporarily shorting wires, which may cause intermittent power reduction at high RPM's. There is an associated TSB as well. Still searching for the thread, perhaps someone with a ZL1 can beat me to it. __________________ 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

05-31-2018, 09:34 AM	#16
collinms Drives: 2017 ZL1 A10 Summit White Join Date: Apr 2018 Location: Cumming, Georgia Posts: 511	I did a little some more testing on this yesterday and I think I narrowed it down to being in manual mode. I don't think it dips in power when leaving it in D. I will do more testing though. I think it's TQ management. I will try different gas next go round as well.

05-31-2018, 08:28 PM	#17
barnesbr Drives: 2018 ZL1 10 spd Join Date: Jul 2011 Location: Tampa, FL Posts: 87 View My Garage	I noticed the exact same thing today coming home from work. I was downshifting with the paddles to pass cars in 3rd and it almost seemed like it skipped a tooth in the rear end. Of course, that’s not the case and there was no noise associated, that is just the best way I can explain the feeling. I pushed the shifter back over to “D” and it wouldn’t do it again. Strange.

05-31-2018, 10:35 PM	#18
ninetres Drives: Crush ZLE M6 \| 2000 Corvette FRC Join Date: Jun 2010 Location: Cencal Posts: 1,659	No felt power dips here, or on the dyno graph......outside of the car going into cat over temp and going extra rich.

06-01-2018, 07:25 AM	#21
7WSM Drives: 2017 ZL1 A10 Join Date: Nov 2009 Location: Pearland, TX Posts: 465	Mine has done this 1 time on the 3-4 shift at the track. I am almost sure it has something to do with the factory PTM that is causing it to pull power for that split second.

06-01-2018, 01:52 PM	#22
GarnetRedJuan Drives: 2017 garnet red zl1 2022 AT4 HD Join Date: Nov 2016 Location: San diego Posts: 117	Mine does this on long freeway pulls usually in 3rd or 4th gear. it feels like a hiccup from timing being pulled or Torque management or traction control. Its usually when its seen a pull or 2 before and its seeing warmer IAT's. I chalk it up to a combination of crappy 91 fuel in CA and extra heat from performance driving.

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