Dip in power at higher rpms

collinms · 05-27-2018, 10:10 AM

I just went out for a Sunday morning drive and was pushing the car hard and noticed sometimes at higher rpms, maybe 5500 there is a dip in power that happens. It's almost like a surge, it's pulling fine then a dip then it returns. I was in track mode PTM race and I did not break traction. Do any of you experience this? Also is it just me or does it seem pointless to Rev it out to 6500? It feels like the car is pulling power at over 6000. I assume this is torque management because it's really noticeable in first and 2nd gear.

Bill_76 · 05-27-2018, 10:32 AM

Yes same behavior in my A10

Chevy71 · 05-27-2018, 11:03 AM

a few quick questions; How many miles are on your car? Do you have factory plugs in it still? What fuel are you running and how long has it been in the car?

The TM system on these cars is very active, but tyipically the automatics are a little calmer because they aren't as hard on the driveline.

Your car makes max power around 5700 and that could be the biggest reason it falls on its face around and after 6k rpms

Gunkk · 05-27-2018, 02:48 PM

Rev limiter, perhaps?

collinms · 05-27-2018, 03:52 PM

Quote:

Originally Posted by Chevy71

a few quick questions; How many miles are on your car? Do you have factory plugs in it still? What fuel are you running and how long has it been in the car?

The TM system on these cars is very active, but tyipically the automatics are a little calmer because they aren't as hard on the driveline.

Your car makes max power around 5700 and that could be the biggest reason it falls on its face around and after 6k rpms

2500 miles, completely stock. Fuel is 93 and replace it often.

collinms · 05-27-2018, 03:53 PM

Quote:

Originally Posted by Gunkk

Rev limiter, perhaps?

No, not that I haven't revved it that high yet and it's an automatic.

SteveV · 05-27-2018, 04:25 PM

I noticed the EXACT same thing today with mine. I have a 2018 M6 with 1800 miles. I just did my second oil change yesterday.

I am glad to see I am not the only one seeing this. It is almost like it gets fuel starved for a second. But considering the amount of black soot I see on the outermost tail pipes, I believe she is running rich.

But this does look like a fuel curve issue... Or the fuel pump cannot keep up...

collinms · 05-27-2018, 04:51 PM

Quote:

Originally Posted by SteveV

I noticed the EXACT same thing today with mine. I have a 2018 M6 with 1800 miles. I just did my second oil change yesterday.

I am glad to see I am not the only one seeing this. It is almost like it gets fuel starved for a second. But considering the amount of black soot I see on the outermost tail pipes, I believe she is running rich.

But this does look like a fuel curve issue... Or the fuel pump cannot keep up...

I'm going to check my air filter tomorrow. Maybe there is a bunch of pollen in there or something. It might just be torque management though.

Chevy71 · 05-27-2018, 05:09 PM

Quote:

Originally Posted by collinms

2500 miles, completely stock. Fuel is 93 and replace it often.

That rules out your plugs and bad fuel from sitting through the winter. How hot was it outside ? The LT4 does pull top end power when its hot outside and your blower is pushing hot air in.. usually it's not real drastic though. With the detail you have given I would say the TM most likely.

Koldunic · 05-27-2018, 05:12 PM

Man..
First the M6 bog, second the left or right steer under WOT and now this?

I have a ZL1 coming in. I am afraid now.

I will follow this thread closely.

collinms · 05-27-2018, 05:16 PM

Quote:

Originally Posted by Koldunic

Man..
First the M6 bog, second the left or right steer under WOT and now this?

I have a ZL1 coming in. I am afraid now.

I will follow this thread closely.

No no don't worry my friend. Even though this happens it's not that big of a deal. I'm just being observant and picky I suppose. The car is amazing and you should not be concerned. My car is perfectly stable and does not go side to side.

nighttowl · 05-27-2018, 05:17 PM

most likely either timing is being pulled due to fuel octane or loss of traction was detected resulting in throttle being reduced.

collinms · 05-27-2018, 05:17 PM

Quote:

Originally Posted by Chevy71

That rules out your plugs and bad fuel from sitting through the winter. How hot was it outside ? The LT4 does pull top end power when its hot outside and your blower is pushing hot air in.. usually it's not real drastic though. With the detail you have given I would say the TM most likely.

It was 80 this morning here.

FASTNUF · 05-27-2018, 09:12 PM

Mines a 2017 A10, no issue with mine except that according to the tach, it shifts slightly early from 1st to 2nd because it revs so fast and the tach can't keep up, lol. All other gears shift at redline like clockwork! No power dips. Only mod is RotoFab as an FYI.

05-27-2018, 10:10 AM	#1
collinms Drives: 2017 ZL1 A10 Summit White Join Date: Apr 2018 Location: Cumming, Georgia Posts: 511	Dip in power at higher rpms I just went out for a Sunday morning drive and was pushing the car hard and noticed sometimes at higher rpms, maybe 5500 there is a dip in power that happens. It's almost like a surge, it's pulling fine then a dip then it returns. I was in track mode PTM race and I did not break traction. Do any of you experience this? Also is it just me or does it seem pointless to Rev it out to 6500? It feels like the car is pulling power at over 6000. I assume this is torque management because it's really noticeable in first and 2nd gear.

05-27-2018, 11:03 AM	#3
Chevy71 Drives: 2016 2SS Join Date: Feb 2017 Location: Pittsburgh PA Posts: 977 View My Garage	a few quick questions; How many miles are on your car? Do you have factory plugs in it still? What fuel are you running and how long has it been in the car? The TM system on these cars is very active, but tyipically the automatics are a little calmer because they aren't as hard on the driveline. Your car makes max power around 5700 and that could be the biggest reason it falls on its face around and after 6k rpms __________________ 2016 2SS/Hyper Blue/M6/NPP/Navi Forged pistons Custom cut Brian Tooley Cam SW long tube headers 3" stainless mid pipe - Secondary Cat delete - High flow cats Port and polished heads-Double valve springs-platinum lifters & push rods Cam phaser limiter - DOD delete P1SC-1 Pro Charger 3.7 pulley Stage II intercooler 667rwhp 577ft lbs

05-27-2018, 04:25 PM	#7
SteveV Drives: 2018 ZL1 Camaro 6M Red Hot Join Date: Aug 2013 Location: Cary, NC Posts: 1,137 View My Garage	I noticed the EXACT same thing today with mine. I have a 2018 M6 with 1800 miles. I just did my second oil change yesterday. I am glad to see I am not the only one seeing this. It is almost like it gets fuel starved for a second. But considering the amount of black soot I see on the outermost tail pipes, I believe she is running rich. But this does look like a fuel curve issue... Or the fuel pump cannot keep up... __________________ People are a lot like slinky's: not very helpful most of the time, but they bring a smile to your face when pushed down the stairs...

05-27-2018, 05:17 PM	#12
nighttowl Sarcasm loading -------- Drives: 2018 ZL1 1LE Join Date: Dec 2011 Location: TX Posts: 1,806 View My Garage	most likely either timing is being pulled due to fuel octane or loss of traction was detected resulting in throttle being reduced. __________________ "The salesman actually told me to stop getting it sideways during the test drive" 2018 MBM ZL1 1LE - Stock 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD

05-27-2018, 10:32 AM	#2
Bill_76 Drives: Camaro ZL1 2018 Join Date: Aug 2017 Location: Hollywood Posts: 135	Yes same behavior in my A10

05-27-2018, 02:48 PM	#4
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	Rev limiter, perhaps?

05-27-2018, 05:12 PM	#10
Koldunic Drives: 2018 ZL1 1LE Join Date: Jan 2018 Location: Canada Posts: 189	Man.. First the M6 bog, second the left or right steer under WOT and now this? I have a ZL1 coming in. I am afraid now. I will follow this thread closely.

05-27-2018, 09:12 PM	#14
FASTNUF Drives: 2017 ZL1 A10 White Vert Join Date: Aug 2017 Location: Katy Tx Posts: 151	Mines a 2017 A10, no issue with mine except that according to the tach, it shifts slightly early from 1st to 2nd because it revs so fast and the tach can't keep up, lol. All other gears shift at redline like clockwork! No power dips. Only mod is RotoFab as an FYI.

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