Alright guys no screaming and yelling at the new guy. Has GM had any power loss issues with these cars? The past weekend I really started to lean on the car a bit and it's just doesn't feel like it's all there. I hear all of the guys on the forum talking about blowing off the tires in 1st and 2nd and my car just doesn't do it.
Don't get me wrong the car feels good and powerful but just not a strong as I think it should. With the TC off, If I walk the car out of the hole and hammer 2nd it spins a little but not that bad. I've seen video of guys on a prepped surface lose the rear at this point. If I stomp it in 1st from 25MPH it doesn't really spin at all either. So I'm wondering, do they have these things on limited power before x miles(my car is an 08 with low miles still)? Is most of the guys on here trying to light up the tires instead of just the raw power taking over?
I would love to hook up with some of the local MD guys to compare if any are willing. No race or anything but a ride in each others car to compare I guess? Let me know your thoughts.
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2008 2LZ Z06 Black on Black
1967 Mustang Convertible 408 Stroker w/NX Fogger Kit
1972 Bronco Sport w/302
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These cars are sensitive to warm weather. If you're having a heat wave locally, you'll notice a power drop because of it. I feel the same when it's pretty hot out. Also, be sure and keep your car up-to-date with tune-ups (plugs, wires, filters, etc).
DJZ, Your car has an "adaptive computer." It learns how you drive and sets performance parameters for that. If you just cruise around, then your car will become "lazy." If you haul ass everywhere, it'll set the parameters a bit more "aggressive." You have 2 choices at this point.
1. Get it tuned by someone with HPtuners or
2. Take it to the dealership and have them "reflash" your computer. This will set the values to the most aggressive.
Remember 90% of the values are set with the first 5 heat cycles. The last 10% take about 50 heat cycles.
One other thing~ how do you have the AH/TC button set? Chances are, you're seeing others with the TC off. This makes a difference.
The difference between a lazy Z and a healthy Z on the dyno can be 430hp vs. 475hp. That's a lot!
(I did everthing I could and got 468hp out of mine!)
Thanks for the reply Norty. For the most part, I have driven the piss out of the car since day one. It does feel strong but not as strong as others that I've been in. I wish we had a way to reset the ECU ourselves. In my E55 we have a method that can reset your ECU back to 0. Is there a way to reset the computer on this car without taking it into the dealer?
Is there a way to reset the computer on this car without taking it into the dealer?
Yes, you can have someone use HPTuners or LS2 edit to change the parameters for your car.(It's best to use a dynomometer for this.) These are "DOS" so they're kind of "approximate" whereas the other tune is "Windows" and is said to be more "exact." I wish I could think of the name of it now. Anyone remember the name of the windows tune? It's hell getting old, I tell ya!
The PCM (Powertrain Control Module), which is the cars main computer so to speak, is only "adaptive" in that it determines timing, injector flow rate, injector pulse width and many other parameters based mainly on current environmental conditions, thottle position and RPM, etc. That is, the only thing adaptive about the PCM is the manner in which short and long term fuel trims are calculated for instance based on environmental conditions. In addition, many of the PCM's calculations are table based and thus unchanging. However, since environmental conditions are continuously changing and affecting the cars performance the PCM is constantly determining those things mentioned above.
For example, when you go to full throttle the PCM uses a lookup table that determines how much fuel to inject into the cylinders based on thottle position and RPM among other factors. This table, again among others, does not change based on how one drives and never changes unless edited by someone.
The PCM is not an artificial intelligence capable of learning how one drives and predicting what will be needed based on who is in the drivers seat. It simply reacts to the environmental conditions as well as current driver actions and if possible the drivers intentions will be realized.
Both LS2 Edit and HPTuners are Windows based applications and as such require the Windows O/S. For example, per Carputing the creators of LS2 Edit: "LS2-edit runs on Windows 98 (Second Edition), Windows NT, Windows XP, and Windows Vista operating systems." And the HP Tuners VCM suite, per HPTuners requires: "Windows 98SE or Better" as a minimum with "Windows 2000/XP or Better recommended".
Perhaps you are thinking of a scanner only application that runs under DOS.
The PCM (Powertrain Control Module), which is the cars main computer so to speak, is only "adaptive" in that it determines timing, injector flow rate, injector pulse width and many other parameters based mainly on current environmental conditions, thottle position and RPM, etc. That is, the only thing adaptive about the PCM is the manner in which short and long term fuel trims are calculated for instance based on environmental conditions. In addition, many of the PCM's calculations are table based and thus unchanging. However, since environmental conditions are continuously changing and affecting the cars performance the PCM is constantly determining those things mentioned above.
For example, when you go to full throttle the PCM uses a lookup table that determines how much fuel to inject into the cylinders based on thottle position and RPM among other factors. This table, again among others, does not change based on how one drives and never changes unless edited by someone.
The PCM is not an artificial intelligence capable of learning how one drives and predicting what will be needed based on who is in the drivers seat. It simply reacts to the environmental conditions as well as current driver actions and if possible the drivers intentions will be realized.
Both LS2 Edit and HPTuners are Windows based applications and as such require the Windows O/S. For example, per Carputing the creators of LS2 Edit: "LS2-edit runs on Windows 98 (Second Edition), Windows NT, Windows XP, and Windows Vista operating systems." And the HP Tuners VCM suite, per HPTuners requires: "Windows 98SE or Better" as a minimum with "Windows 2000/XP or Better recommended".
Perhaps you are thinking of a scanner only application that runs under DOS.
Good post No Doubt,
Don't know what NORTY is smokin?
Maybe his Z in not broken in yet? I think it'll make more power with a couple or 3,000 miles on it.
Thanks a lot for the info guys. I haven't posted that much lately but since the weather has cooled off the car does feel much better. I can't believe this car is as sensitive to heat as my old E55. I took the car to the track this weekend and ran 11.58 at 126.7. Not the best and I know it will do better but I was happy with the MPH.
Don't get me wrong the car feels good and powerful but just not a strong as I think it should. With the TC off, If I walk the car out of the hole and hammer 2nd it spins a little but not that bad. I've seen video of guys on a prepped surface lose the rear at this point. If I stomp it in 1st from 25MPH it doesn't really spin at all either. So I'm wondering, do they have these things on limited power before x miles(my car is an 08 with low miles still)? Is most of the guys on here trying to light up the tires instead of just the raw power taking over?
First off, the heat may make a measurable difference, but not huge. Any time you floor it in first with TC off it should spin easily. If that doesn't happen, you have a problem--don't blame it on the heat... Second gear is more iffy--depends on RPM and how abruptly you hit it and especially on the road surface. This is one significant difference between C6Z and C5Z--the C5 is geared lower, and will always spin in second, but the C6 will generally spin in second. Third gear is safer to use all the power, but beware of little hills, corners, gravel, etc.
__________________
2006 Corvette Z06--DSOM
1968 Dodge Charger RT 440--Red
2007 Kawasaki ZZR 600--Black
I think, therefore I am
--Rene Descartes
I am, therefore I think
--Gersh Lundberg
Maybe his Z in not broken in yet? I think it'll make more power with a couple or 3,000 miles on it.
Norty doesn't smoke. Norty also knows the ECM is adaptive. Not only that you floor the throttle,but "how fast it's done" makes a difference. So I got HPtuners & LS2Edit mixed up. Oh well. Carry on, gentlemen.
Norty doesn't smoke. Norty also knows the ECM is adaptive. Not only that you floor the throttle,but "how fast it's done" makes a difference. So I got HPtuners & LS2Edit mixed up. Oh well. Carry on, gentlemen.
If the system is truely "adaptive" then there will be no need to get it "reflashed to stock", just beat on it for a while and it will wake up again - right?
Or are you suggesting that once this "trend" is established, thats it?
Norty also knows the ECM is adaptive. Not only that you floor the throttle,but "how fast it's done" makes a difference. So I got HPtuners & LS2Edit mixed up. Oh well. Carry on, gentlemen.
It should be VERY EASY for you to post some PROOF from an OFFICIAL GM document/publication/dealer brochure that mentions what you claim about the ECM being adaptive.
Could not find it mentioned in my 2004 factory service manual.
In some circles this would be called "Put up, or shut up".
No offense meant, but there are many extremely knowledgable members owning multiple Z06's, who work on their own cars, who have not heard of this "feature".
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