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Could this be part of the reason for "power loss"?!
Halltech made a great point that was brought up in a seperate thread that I feel like would bring a good discussion. I never heard about this before. Could this be a problem with "reduced power".
Originally Posted by Halltech
Having said that, we have all seen by now, the 3.1 sec data recorder video, which shows a M7 in first gear. The car bogged on launch and the tire temps and ground temp were probably not ideal.
Once a proper launch technique is mastered by one of the forum members, I guarantee we will see 2.8s and maybe better.
What some folks do not realize is that the C7 has Nannys that attenuate power when the tires are COLD (below 45F) and WARM (below 115F) that do not allow full power. I have tried to find that parameter in the Z06 program, but no luck yet. Imagine if one of the magazine testers tries a 0-60 on cold tires with the TCM and ECM fighting to keep TC from putting full power to the rear end.
Check out this article and think about all the tests that have been done so far, even roll on tests. Has anyone thought about this Nanny?
Full power only with the tire temps above 115F? Could this be why I saw 74% throttle position under full throttle on our C7 back in January? Some tuners have said that 90% means full throttle. Does it really mean that 90% means 90% because the interpolated tire temp is under 115F? It appears that this Patented Monitoring system is the ultimate Nanny! I have yet to find an algorithm in the ECM that shows these parameters, or a way to shut them off.
Let the tuners jump in here and speak to this. Patented Monitoring System means that GM has found a way to bypass the tuners with this one, if the Stabiltrak and ELSD could be attenuated. Obviously, this is a safety protocol, and why would you ever want to bypass it? How about the dyno? Drag racing, etc where your car has slicks onboard?
I'm not convinced that there really is a problem with the C7Z or that GM has varied the power available with tire temp. However, if that is the case it's actually fantastic to hear because now we just need someone to come up with a set of tire temp sensors that report always hot. No change to the tune so no warranty problems.
Halltech made a great point that was brought up in a seperate thread that I feel like would bring a good discussion. I never heard about this before. Could this be a problem with "reduced power".
Sure seems like it's one of them. There it is in black and white. Nice find. Tx Paul
"The car bogged on launch and the tire temps and ground temp were probably not ideal." If this patented monitoring system aka smart tire truly works the way as stated in the article, could this actually explain the "nose dive" between shifts (assuming that the shifts were done correctly), with the system acting in a way to prevent the "cold/warm" tires from spinning in between shifts? Would having "hot" tires prevent the "nose dive"?
I have seen them "hot" at the track but not on the street.
Thanks, I tried pretty hard on 7 miles of curvy back road with no success.
I have only been to one track event so far and it rained all day, so I couldn't push the car very hard.
Did you notice any difference in performance once the tires went from warm to hot?
Forgive the no0b question because I don't pick mine up till tomorrow ...
Assuming that this 'smart tire' variable is really there interacting with the stock tune ... is there a tire temp display/readout on the DIC or PDR (the way we have TPMS displayed) to know where the temps are at any given time?
Using the cosworth toolbox software I was able to see these parameters of my 3.1 sec run video. Again i ran maybe 25 runs 0-60 i felt like the tires were warm but didnt actually check till this idea was brought up. You may very well be on to something.
Forgive the no0b question because I don't pick mine up till tomorrow ...
Assuming that this 'smart tire' variable is really there interacting with the stock tune ... is there a tire temp display/readout on the DIC or PDR (the way we have TPMS displayed) to know where the temps are at any given time?
Thanks.
On my C7Z51 all you get is PSI for each tire or the cold- warm-hot as you see above. There is not a display to show actual individual tire temps by Fahrenheit. I sure wish there was but I don't think the tire pressure sensor/temp is that sophisticated yet.
Crap what would it take to get them that hot. We did at least 25 pulls. Spun the crap out of them. They are pretty warn down now. I could see us getting them hot enough on a road course but on the street is going to be darn near impossible
12-28-2014, 05:38 PM
Could this be part of the reason for "power loss"?!
