LSA Rev Limiter - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Blueclyde · 07-25-2013, 08:51 PM

Where is the rev limit set in the stock calibration and what specific action occurs when you hit it?

Just installed a data logger and wide range O2 and am seeing some weird things that I though was the rev limiter. After looking at data, I'm not so sure. Kind of looks like it might be misfire.

My car is 100% stock.

Blueclyde · 07-25-2013, 10:18 PM

I had TC turned off.

CanadianZL1#992 · 07-25-2013, 10:22 PM

6250RPM. It dumps the boost and cuts the fuel for a split second. The RPM only drops a few and the fuel comes back on. If you don't shift or let off the throttle it will just keep doing it, feels like the car is surging.

ZO6 Bryan · 07-25-2013, 10:22 PM

Quote:

Originally Posted by Blueclyde

Where is the rev limit set in the stock calibration and what specific action occurs when you hit it?

Just installed a data logger and wide range O2 and am seeing some weird things that I though was the rev limiter. After looking at data, I'm not so sure. Kind of looks like it might be misfire.

My car is 100% stock.

Stock calibration cuts the fuel at 6200 rpm then it will be re-enabled at 5975 rpm. I will feel like a big "pa-pow" and massive miss then it comes right back on.

Blueclyde · 07-25-2013, 10:32 PM

Engine speed was just over 6200. No change in foot pedal input or throttle but rpm started dropping. It dropped about 1000 rpm. I saw no change in injector pulse width. I need to go back and look at boost. The other strange thing is AFR went way lean, like 22:1. The AFR and logger are new. Today was the first time logging with the AFR. It all seems to be working right. I was thinking misfire. I think I'm going to look at the plugs.

CanadianZL1#992 · 07-25-2013, 10:57 PM

Quote:

Originally Posted by ZO6 Bryan

Stock calibration cuts the fuel at 6200 rpm then it will be re-enabled at 5975 rpm. I will feel like a big "pa-pow" and massive miss then it comes right back on.

Thought I read redline was 6200, fuel shutoff at 6250. Doesn't matter to me, mine is set at 6800 now lol. I haven't come up against it yet. I bumped the rev limiter a few times when the car was stock and didn't notice anything drastic just surging.

ZO6 Bryan · 07-25-2013, 11:37 PM

Quote:

Originally Posted by CanadianZL1#992

Thought I read redline was 6200, fuel shutoff at 6250. Doesn't matter to me, mine is set at 6800 now lol. I haven't come up against it yet. I bumped the rev limiter a few times when the car was stock and didn't notice anything drastic just surging.

I found the rev limit the first week I owned mine on the road course. It feels like a lot more than a surge. Feels like you shut the key off. And it was "Pa-Pow" when I hit it on the dyno that everyone in the shop went "WTF was that." Natural tendency when you feel it is get off the throttle immediately.

ZO6 Bryan · 07-25-2013, 11:40 PM

Quote:

Originally Posted by Blueclyde

Engine speed was just over 6200. No change in foot pedal input or throttle but rpm started dropping. It dropped about 1000 rpm. I saw no change in injector pulse width. I need to go back and look at boost. The other strange thing is AFR went way lean, like 22:1. The AFR and logger are new. Today was the first time logging with the AFR. It all seems to be working right. I was thinking misfire. I think I'm going to look at the plugs.

If you felt it at 6200 rpm there is nothing wrong with your plugs. It was the rev limit.

CanadianZL1#992 · 07-26-2013, 06:31 AM

Quote:

Originally Posted by ZO6 Bryan

I found the rev limit the first week I owned mine on the road course. It feels like a lot more than a surge. Feels like you shut the key off. And it was "Pa-Pow" when I hit it on the dyno that everyone in the shop went "WTF was that." Natural tendency when you feel it is get off the throttle immediately.

I've got a video I'll try to find and post today of my car doing a big burnout, as I went by the camera I was bouncing off the rev limiter several times. My car does nothing drastic. No pa-pow, just a small surge, nothing like shutting the key off.

djnice · 07-27-2013, 12:35 AM

Maybe the pa-pow changes with gear. I usually hit mine in 3rd and its not too crazy.

429 · 07-27-2013, 01:31 AM

The pcm can cut fuel, spark, or throttle % in any combination it sees fit.

DrkPhx · 07-27-2013, 08:15 AM

From what I've seen in all LSA ECM M6 tunes (V and Z) rev limiting is only controlled by fuel cuff off; not spark or ETC. The rev limiter by gear for the M6 is 6200 rpms; but there are also is a Main Rev Limiter Upper of 6300 and a Main Rev Limiter Lower of 6220 rpms.

white ZL1 · 07-27-2013, 09:19 AM

Quote:

Originally Posted by DrkPhx

From what I've seen in all LSA ECM M6 tunes (V and Z) rev limiting is only controlled by fuel cuff off; not spark or ETC. The rev limiter by gear for the M6 is 6200 rpms; but there are also is a Main Rev Limiter Upper of 6300 and a Main Rev Limiter Lower of 6220 rpms.

Look again. After 5 seconds on the "main" limiter, it switches over from fuel/spark cut to ETC.

Blueclyde · 07-27-2013, 04:14 PM

Yes, it had to be fuel cut. I'm not logging any parameters that confirms that but seeing AFR go to 22:1 is somewhat confirming. This thing goes right to fuel cut at 6200. I find myself pulling 2nd right at 6000. If I let it go an past 6000, it's too late.

07-25-2013, 08:51 PM	#1
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	LSA Rev Limiter Where is the rev limit set in the stock calibration and what specific action occurs when you hit it? Just installed a data logger and wide range O2 and am seeing some weird things that I though was the rev limiter. After looking at data, I'm not so sure. Kind of looks like it might be misfire. My car is 100% stock.

07-27-2013, 12:35 AM	#10
djnice Drives: 13 ZL1 SIM, 99 Z28 Black Join Date: Feb 2013 Location: Spokane, WA Posts: 708	Maybe the pa-pow changes with gear. I usually hit mine in 3rd and its not too crazy. __________________ 2018 C7 Z06 - WGG, M7. / 2013 ZL1 - SIM, 6 spd, RotoFab CAI, Can. / 1999 Z28 - Black, 6 spd, K&N, Subframe. / More Fun Stuff - www.inlandspeed.com

07-25-2013, 10:18 PM	#2
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	I had TC turned off.

07-25-2013, 10:22 PM	#3
CanadianZL1#992 ANGRY Z Drives: 2015 Camaro ZL1 Join Date: May 2012 Location: Alberta, Canada Posts: 1,406	6250RPM. It dumps the boost and cuts the fuel for a split second. The RPM only drops a few and the fuel comes back on. If you don't shift or let off the throttle it will just keep doing it, feels like the car is surging.

07-25-2013, 10:32 PM	#5
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	Engine speed was just over 6200. No change in foot pedal input or throttle but rpm started dropping. It dropped about 1000 rpm. I saw no change in injector pulse width. I need to go back and look at boost. The other strange thing is AFR went way lean, like 22:1. The AFR and logger are new. Today was the first time logging with the AFR. It all seems to be working right. I was thinking misfire. I think I'm going to look at the plugs.

07-27-2013, 01:31 AM	#11
429 Account Suspended Drives: 2010 camaro ss Join Date: Nov 2012 Location: Richmond Hill, GA Posts: 726	The pcm can cut fuel, spark, or throttle % in any combination it sees fit.

07-27-2013, 08:15 AM	#12
DrkPhx Drives: 2013 Triple Black ZL1 / 2006 TB SS Join Date: Feb 2011 Location: MN Posts: 2,250	From what I've seen in all LSA ECM M6 tunes (V and Z) rev limiting is only controlled by fuel cuff off; not spark or ETC. The rev limiter by gear for the M6 is 6200 rpms; but there are also is a Main Rev Limiter Upper of 6300 and a Main Rev Limiter Lower of 6220 rpms.

07-27-2013, 04:14 PM	#14
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	Yes, it had to be fuel cut. I'm not logging any parameters that confirms that but seeing AFR go to 22:1 is somewhat confirming. This thing goes right to fuel cut at 6200. I find myself pulling 2nd right at 6000. If I let it go an past 6000, it's too late.