I have not done a 2000 rpm launch since I had it at the track last year. Yes, It will spin them on the 1-2 shift. But I also know that spinning tires is based upon an awful lot of variables. In the winter, with cold weather producing more horsepower and colder tires and pavement, they spin a lot. In the heat of Houstons summers, it's not unusual for them to not spin unless really provoked with some fancy clutchwork.

I'd love to meet you in Dallas, but when I get up there it's always on business and the Corvette stays at home

 

Jim did you use a suicide shifter

 

We're having fun now! No, I tried. I was sponsored by the Hawg club of America and they really wanted me to use one, but I was up against some pretty stiff competition, so I elected to use a conventional shifter......

Just kidding, of course. I raced a 750 Honda for the most part. But at least I know what a "suicide shifter" is

 

thats what its all about Jim fun

 

OK, if you were speed shifting during both runs, then I am a firm believer that there is TM.

Thanks,
Glenn

 

Thank you for posting the chart it is a graphic representation of what I felt at the track! My car just seemed to lay down and die!

Ok we were having a discussion about "TM", GM abuse mode call it what ever you want. I am reading all these posts and we are all trying to describe what we feel our car is doing as we drag race. At this point I think that we all can agree that there is an "GM abuse mode" that really does not always protect our driveline. The problem as I see it is that some of us have actually felt it kick in and others of us have not.

To those of us who have felt it we know something is going on while others think we're crazy. It is my firm belief that driving ability, more seat time or whatever you want to call it has allowed some of us to "drive around it" and others like me to run disappointing times as it kicks in. (of course when you always have been the wrench and then you get drive......... well most of you guys know my story)

Once again we have beat the livin hell of of an issue. Thank you Boosted & Ranger for the tech info

Now it is time for a

 

Tommy, I agree with you there. One think I would love to know is this. How many of the people who have felt it "die" had Traction Control and/or Active Handling on (or even in competition mode)? That is the one variable that I truly think makes a difference, based on my experiences. I just find it too odd that I"ve had two C6's, and have never experienced the "lay down and die" - but I alway turn AH & TC off when I run hard.

 

Jim as i have said many times i believe in driving the car. i get in start car when dic is clear hold button down till tc & ah are off.then if their is a 360, 720 0r fishtail witch there isn't, maybe a fishtail or wiggle it was because of my driving. not because i relied on a computer to do it and it failed then an accident happened.at the track i have ran with nothing off only 1/10th difference. that's with good traction like always of course.

 

Dennis - you and I are "old school". Some day we are going to find work because we know what a "Dwell Meter" is, we know about the window to set the dwell on GM distributors, and we have this thing called a "timing light" tucked away in our tool kits. And what about those old dual point Chrysler distributors?

Anyway, my main question regarding the AH/TC has to do with manual transmission cars, and how they react. I guess the same could be asked on an automatic car, but I have no experience there.

 

OK Jim now I see. your like the z51 and z06 guys ,come on its a 3800 converter thats almost like a clutch.

 

As for the automatic something is there but it is intermitent. I have yet to get under a 2sec 60ft time so for me that feels normal. I have also never felt the car lay down in the first to second gear shift. Maybe it happens all the time and just feels normal to me. But the 2nd to 3rd gear shift I have felt it happen many times. In all cases I was at the track with both TC and AH off. Just got a tune though and we will see what happens next week. Still have to finish my vacation.

 

All my passes have been made with 33 psi cold all around. Temps mid 70's to low 80's, humidity in the 70's. Never heated my tires, just "cleaned" them before launch (unproven tranny strength). Experimented in all modes, settings, combinations, launch techniques, TM always present. Left lane flattest and faster. Found running to the RIGHT of the tracks of previous cars (more slippery) to provide consistent better times, because if I ran over the tracks I'd encounter mini bumps under left tires during shifting that consistently provided the worst passes. Running literally one inch from the cones where it is flattest, consistently gave me the fastest slips. In my car, it's that sensitive.

My theory, documented in 1/4 mile perf, I speculated that TM values vary among our cars. Thus, it could explain in part why some have TM and some don't or think they don't? Or to what degree. Of course there are some of us that CAN feel a 10hp difference and others that could not feel a 20hp difference.

On a stock 'vette A6, you will be able to "drive around it" only so much. In essence, the car will drive you. GM intended it that way.

Edit; This is my last contribution to this thread.

 

Dennis - with your 3800 converter, that thing has to come out of the hole like a raped ape. You leave us "manual" guys for dead at the line!

 

Jim i have to baby it off the start about 1/8 to 1/4 throttle till 100 ft. than roll the rest of the way in to it and still 1.764 60ft stock tires. just haven't decided what rims and drag tires yet

 

I just can’t get the Physics thing out of my mind on this TM, maybe I’m blinded by this. I remember when I was really active in the race mode and we ran a 55 chev, 327cuin, 780 Holly, 12.5:1 pistons, 5:38 rear end gears and a cam we joked only fully closed on Wed afternoons. We launched 8Krpms, 6500 and it bogged and it made sense do to the car weighed more than a house. We minimized the problem by getting rid of the aluminum flywheel and returned to a heavy steel one. Now there was no TM involved with that car, timing was curved via being creative with Malory and their distributor. Then when I talk to my contacts at GM and they say that this power train with Fuel injection computer controlled electronics Fed regulations and tons of other things going on is nothing more than tuned to meet all the requirements. They also told me that there is concern that the algorithms are being compromised with aftermarket turners not being aware of why it was tuned that way in the first place. Then when I got mine tuned there was no reference to any TM as in any simplistic read me file other than just adjust and run dyno pull. Then when we find that the car developed more Hp by reducing timing I wonder why it only worked with my car. They also discussed the old days when one had limited control on ignition and how it now can be so precisely control and their main concern is with internal engine problems caused by inappropriate timing scenarios.

 

NICE CAR. but how fast could it go?even at 12.50 to 1 you cant compare the hp and tq. and i bet the duration of the 3/4 cam made it bog and be a real chevy dog.

 

My buddy launched his car with ET Streets off of the rev limiter and it bogged. I'm sure the LS2 has enough power to spin the tires, even ET Streets. If it is not TM what else could it be? I'm shocked the car still has a rear.

 

Set the Wayback, Peabody, that shoebox is making me want to run to my video shelf for a "Two Lane Black Top" + "American Graffitti" impromptu double feature film festival.

Nice!

But as another poster asked, what ET did you get, and at what cost (29 MPG? 186 top end? start when cold or hot instantly? work from sea level to 10,000 feet on same trip? Cali emissions sniffer?)

I am not saying our cars should not be tunable, but indeed there is a lot of activity and interaction and complexity, so TM may be so deeply intwined (remember knowledgable tuner who said it is not a setting or a piece of code or a program but a system) that there is only so much we can extract...

Be interested to know what goes with a LS2 (or LS7) crate motor set up, with expected limited external sensor support, and what would happen if that system got... transplanted... into a C6....

[maniacial laugh]

 

DITTO -

 

Jim
On that run I had both off & nothing appeared on the DIC...... The car just laid down like I took my foot out of it. It was a very different feeling then the time I smoked them really bad out of the hole on got all sideways. (also with both off & you should remember that post ). I really have to play some more while it is still stock. I want to try flashing the converter and heating the tires in the fall and see what happens.