Z06 2000 mile performance change?
Thread Starter
Instructor
Joined: Aug 2000
Posts: 160
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From: Jamesport, NY
Z06 2000 mile performance change?
When my 2024 Z06 passed 2000 miles I almost immediately noticed a performance change. Throttle response and torque increased. Does anyone know if GM had an ECU limitation that was removed at 2000 miles? Never heard of such.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.
Last edited by B-52; Mar 12, 2025 at 08:42 AM.
Race Director
Joined: Mar 2007
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When my 2024 Z06 passed 2000 miles I almost immediately noticed a performance change. Throttle response and torque increased. Does anyone know if GM had an ECU limitation that was removed at 2000 miles? Never heard of such.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.
The settings, of course, affect throttle and engine response. So it will become more aggressive when the engine/shift parameter is set to Sport or Track, rather than Tour or Weather. That setting can be selected in Z-mode. Or it defaults in Tour, Sport, and Track Driver modes to the respective settings. I believe available PTM settings can also affect performance.
Instructor
Joined: Oct 2024
Posts: 132
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I should cross the 2K mark on Saturday and I'll let you know if I notice a difference. I think I'm around 1980 as of today so I might even break 2k tomorrow if the car goes out after work but it definitely will on Saturday. I am hoping there is something but am not super optimistic about that. I didn't really notice the difference at 500 miles because I had been taking it so easy and it was therefore hard to tell what performance difference was from actually being able to rev it out a bit and drive more aggressively versus limitations going away.
I noticed with my Supra that the exhaust got a bit more throaty with more pops over time (i.e., over 5k miles) but that was about it.
I noticed with my Supra that the exhaust got a bit more throaty with more pops over time (i.e., over 5k miles) but that was about it.
Burning Brakes
Joined: May 2023
Posts: 1,026
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From: Ontario
I have a Stingray Z51 and not a Z06 so I do not follow the Z06 specific forum. But the Owner's Manual is the same for both isn't it? The 2025 manual has details for both models. And the only limitation it mentions in the manual is a torque limit in low gears, but that is lifted at 500 miles. Where does the 1500 mile limit that you mentioned come from? I know there is a requirement not to participate in track events, sport driving schools, or similar activities for 1500 miles, but as far as I know, its on the operator to observe that. It does not say there is any built-in performance limit.
The settings, of course, affect throttle and engine response. So it will become more aggressive when the engine/shift parameter is set to Sport or Track, rather than Tour or Weather. That setting can be selected in Z-mode. Or it defaults in Tour, Sport, and Track Driver modes to the respective settings. I believe available PTM settings can also affect performance.
The settings, of course, affect throttle and engine response. So it will become more aggressive when the engine/shift parameter is set to Sport or Track, rather than Tour or Weather. That setting can be selected in Z-mode. Or it defaults in Tour, Sport, and Track Driver modes to the respective settings. I believe available PTM settings can also affect performance.
If there's a Y/O/R line limiter when the break in period is over, like on my tach now, yellow is at 5500 rpms when engine is at operating temp, orange at 6000rpms, and red at 6500rpms, might it also have a lower limiter range when the rpm Y/O/R limits are lower during break in? Perhaps?
Race Director
Joined: Mar 2007
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My 2024 SR Z51 had reduced yellow/orange/red range indicators on the tach until 500 miles, IIRC.
If there's a Y/O/R line limiter when the break in period is over, like on my tach now, yellow is at 5500 rpms when engine is at operating temp, orange at 6000rpms, and red at 6500rpms, might it also have a lower limiter range when the rpm Y/O/R limits are lower during break in? Perhaps?
If there's a Y/O/R line limiter when the break in period is over, like on my tach now, yellow is at 5500 rpms when engine is at operating temp, orange at 6000rpms, and red at 6500rpms, might it also have a lower limiter range when the rpm Y/O/R limits are lower during break in? Perhaps?
Le Mans Master
Joined: Mar 2001
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From: Omaha
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
I noticed zero difference on my 24 Z06 at 1500 or 2000 miles. No difference in throttle response, torque, sound, anything. Did you maybe switch to a different gas station with different octane level (i.e. going 91 to 93), or maybe just one with better gas?
Burning Brakes
Joined: May 2023
Posts: 1,026
Likes: 369
From: Ontario
If I follow your question correctly the answer is no. The software limiter never changes - and its at (or very near) the published redline. Prior to 500 miles, the red region on the tach will show the lower limit shown in the "break in" procedure in the manual. But its up to the operator to observe that, and its easy (too eaay?) to exceed it. And...as you noticed....even after the 500 miles, the car will show a lower red area on the tach when the engine is cold. As it warms up the red area moves back to the published red line. But the hard limiter in software never changes.
They can reduce engine torque, but not prevent excessive rpms? Seems odd.
"During the first 800 km (500 mi), engine
torque will be limited in low gears."
Race Director
Joined: Mar 2007
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Several, including me, accidentally exceeded the brake-in limit - its easy to do just with moderate pressure on the accelerator - in my case it quickly downshifted, and zoomed up to something above 4500 RPM. Its easier when the engine/shift is set to Sport, or Track, rather than Tour, because it wants to downshift sooner in those setting. It does not require full throttle acceleration to do so. But...no harm done for brief excursion.
Torque is reduced in first and second gear, probably by pulling timing a bit. I've seen suggestions that its to protect the transmission for the first 500 miles.
I've seen speculation on why they chose not to limit RPM to the lower number with software - but really can't recall the exact reasoning.
Last edited by Andybump; Mar 21, 2025 at 05:30 PM.
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Safety Car
Joined: Jun 2006
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From: Ashland, OH
When my 2024 Z06 passed 2000 miles I almost immediately noticed a performance change. Throttle response and torque increased. Does anyone know if GM had an ECU limitation that was removed at 2000 miles? Never heard of such.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.
yes I am aware of the 1500 mile limitation , etc . and been driving sports cars for many years. I thought it was my imagination, but I also might just be nuts and my wife can attest to that.