UPDATE! 5000 RPM Limit MYSTERY SOLVED!?!? - Page 12

Evolvedx27 · 05-23-2017, 11:13 PM

Roto fab looks like a very good option. Sooner rather than later.

ELS1 · 05-24-2017, 12:02 AM

Quote:

Originally Posted by hawk02

Found this over on the HP Tuners forum. It's a 2016 SS with a magnuson supercharger that repeatedly hits a limiter at 5700 rpm. The cause turned out to be the rubber inlet tube collapsing.

https://www.hptuners.com/forum/showt...r-at-5-700-rpm

If this is the case, perhaps there is a manufacturing defect on certain batches? I wonder what the short term fix from GM will be if that's not the case...maybe they'll release their "performance" intake to solve the issue. Nice find!

dcosta · 05-25-2017, 03:22 PM

We have found the problem with these two cars that is cutting out at wot!!!
The op with chime in to inform you soon to what GM has said..
But we both already knew just needed confirmed..

cwebster · 05-25-2017, 03:56 PM

Quote:

Originally Posted by dcosta

We have found the problem with these two cars that is cutting out at wot!!!
The op with chime in to inform you soon to what GM has said..
But we both already knew just needed confirmed..

ssrallyred · 05-25-2017, 04:15 PM

Quote:

Originally Posted by dcosta

We have found the problem with these two cars that is cutting out at wot!!!
The op with chime in to inform you soon to what GM has said..
But we both already knew just needed confirmed..

Just spill it brother

ZL1 1LE · 05-25-2017, 04:17 PM

Is there a YouTube video that we're going to have to click on to find out the answer?

Zepp · 05-25-2017, 04:21 PM

Quote:

Originally Posted by dcosta

We have found the problem with these two cars that is cutting out at wot!!!
The op with chime in to inform you soon to what GM has said..
But we both already knew just needed confirmed..

dcosta · 05-25-2017, 04:49 PM

Quote:

Originally Posted by ssrallyred

Just spill it brother

No this is his post and he is a very nice person..
I could do it on mine but I will let him inform you all.
We found it before the dealer did or a least my dealer for sure.

VAZL1 · 05-25-2017, 04:50 PM

ORLYHPD · 05-25-2017, 05:00 PM

Quote:

Originally Posted by dcosta

No this is his post and he is a very nice person..
I could do it on mine but I will let him inform you all.
We found it before the dealer did or a least my dealer for sure.

lol

dcosta · 05-25-2017, 05:21 PM

Quote:

Originally Posted by ORLYHPD

lol

I do already
Rev limiter hits at 5000 to 6000 rpm,,,,,

lol

Evolvedx27 · 05-25-2017, 05:34 PM

Just say it... Not a big deal

SkunkJunk420 · 05-25-2017, 05:45 PM

Quote:

Originally Posted by dcosta

We have found the problem with these two cars that is cutting out at wot!!!
The op with chime in to inform you soon to what GM has said..
But we both already knew just needed confirmed..

Sooner Cole · 05-25-2017, 05:49 PM

Well, I think we have solved the problem. After having the "black box data recorder" for the last couple of days and duplicating the issue, here is what the engineers have found. There is a sensor in the clutch pedal that will cut the spark to the engine if your foot touches it while under WOT. It is apparently VERY sensitive and you CANNOT touch the pedal with your foot while under WOT or the sensor will cut power at 5100 RPM's. The engineers have designed this as a safety measure to keep from over revving the engine. He explained that this a very powerful engine and very expensive to warranty. So they made this safety feature very sensitive. An over revved engine would NOT be covered by warranty. So you must keep your foot off of the clutch until you are about to shift, the slightest of contact with the clutch pedal while at full throttle over 93% depressed will cut the spark and power to engine. You don't even have to press the pedal at all, just resting your foot on clutch pedal in anticipation of next shift will activate sensor and cut power. I wasn't sure I believed them at first because I have had multiple stick shift cars over the years and I am driving the same as always. They said they understood, but most cars are not set up like the ZL1. So I went out and tested the car and put it through multiple hard 0-60 pulls with my foot OFF of the pedal and it never cut power. I tested again resting foot on clutch pedal and bingo, cut the power at 5100 RPM's. He said it was the third known case recently that they have put a data box on and all had the same results. It makes me wonder if it is TOO sensitive? I would like to thank the dealer, GM Field Engineer and the GM engineers who analyzed the data. The were very courteous and determined to get to the bottom of it. Also, Dcosta, on this forum for figuring out the issue before the engineers could confirm. I guess I will need to adjust my driving technique from here on out.

05-25-2017, 03:22 PM	#157
dcosta Drives: 17 ZL1 6M Join Date: Aug 2009 Location: peoria,az Posts: 204 View My Garage	Found it!!!!!!!!! We have found the problem with these two cars that is cutting out at wot!!! The op with chime in to inform you soon to what GM has said.. But we both already knew just needed confirmed.. __________________ DCosta9

05-25-2017, 04:17 PM	#160
ZL1 1LE @zle_blackwing Drives: 2018 ZL1 1LE Join Date: Mar 2017 Location: S OC Posts: 1,390	Is there a YouTube video that we're going to have to click on to find out the answer? __________________ 2018 ZL1 1LE - Red Hot, Nav, PDR

05-25-2017, 04:50 PM	#163
VAZL1 Drives: 17 ZL1 Join Date: Mar 2017 Location: VA Posts: 1,075	__________________ 2017 ZL1 Coupe M6, Red Hot Mods; AFE Pro 5R CAI, Kong Ported Blower and Snout, NW 103 TB, Griptech 2.31 Upper, Kooks 2",JMS Voltage Booster, Flex Fuel, Mighty Mouse CC,Jannetty Racing Tune, 680 rwhp

05-25-2017, 05:49 PM	#168
Sooner Cole Drives: 2019 ZL1-1LE A10 Join Date: Jan 2017 Location: Oklahoma Posts: 512	Mystery Solved Well, I think we have solved the problem. After having the "black box data recorder" for the last couple of days and duplicating the issue, here is what the engineers have found. There is a sensor in the clutch pedal that will cut the spark to the engine if your foot touches it while under WOT. It is apparently VERY sensitive and you CANNOT touch the pedal with your foot while under WOT or the sensor will cut power at 5100 RPM's. The engineers have designed this as a safety measure to keep from over revving the engine. He explained that this a very powerful engine and very expensive to warranty. So they made this safety feature very sensitive. An over revved engine would NOT be covered by warranty. So you must keep your foot off of the clutch until you are about to shift, the slightest of contact with the clutch pedal while at full throttle over 93% depressed will cut the spark and power to engine. You don't even have to press the pedal at all, just resting your foot on clutch pedal in anticipation of next shift will activate sensor and cut power. I wasn't sure I believed them at first because I have had multiple stick shift cars over the years and I am driving the same as always. They said they understood, but most cars are not set up like the ZL1. So I went out and tested the car and put it through multiple hard 0-60 pulls with my foot OFF of the pedal and it never cut power. I tested again resting foot on clutch pedal and bingo, cut the power at 5100 RPM's. He said it was the third known case recently that they have put a data box on and all had the same results. It makes me wonder if it is TOO sensitive? I would like to thank the dealer, GM Field Engineer and the GM engineers who analyzed the data. The were very courteous and determined to get to the bottom of it. Also, Dcosta, on this forum for figuring out the issue before the engineers could confirm. I guess I will need to adjust my driving technique from here on out. __________________ 19 ZL1-1LE A10

05-23-2017, 11:13 PM	#155
Evolvedx27 Drives: 2017 ZL1 Join Date: Aug 2016 Location: Long Island, New York Posts: 1,036	Roto fab looks like a very good option. Sooner rather than later.

05-25-2017, 05:34 PM	#166
Evolvedx27 Drives: 2017 ZL1 Join Date: Aug 2016 Location: Long Island, New York Posts: 1,036	Just say it... Not a big deal

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