Can't Chirp 3rd gear?
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by MJMJ
...And what is TM?
The short answer is that the Stock Engine Control Module is programmed to reduce engine power during strong launches and shifts in order to protect the drive train. TM manifests itself in other conditions too, but its effect under strong acceleration is where owners focus.
TM is the primary reason why the C6 (400 HP) accelerates a bit slower than the 2002+ C5Z (405 hp). Generally the TM penalty in the quarter-mile is 2-3 tenths. That is, all other things being the same, a car with just TM tuned out will run the quarter 2-3 tenths faster.
Be aware that TM is a controversial topic. There are many doubter that it even exists. But they are wrong.
Here is a fairly typical Torque Management thread. Not a pleasant read. The facts are in there; but you have to squint a lot to find them.
Ranger
Last edited by Ranger; Jul 18, 2006 at 08:10 AM.
Burning Brakes
Joined: Oct 2005
Posts: 791
Likes: 2
From: Stafford Virginia
Originally Posted by MJMJ
You hit the nail in the head, it is deffinetly more like a belt squeal. What is that?
The tensioner also relaxes instantaneously between shifts from the decreased load being placed on the belt, which compunds the the issue.
Team Owner
Joined: Apr 2005
Posts: 35,769
Likes: 148
From: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
Originally Posted by CYA-Vett
The non Z51 mn6 cars will run through the traps in 3rd (stock). Which is why I believe that non Z51 cars are just as quick in the quarter mile (one less shift). 
Normally the first 2 gears are all that’s needed. I think that goes a long way towards promoting that tranny. I tend to call that box the street racers delight.Not me of course I out grew that sport in the early 70s.
Race Director
Joined: Apr 2005
Posts: 10,436
Likes: 4
From: Everett Wa
I have had mine break loose shifting into third at the track. But this was in early spring track temps where in the 40's. This is stock but I think it really had to do with managing engine temps and having max power when the run was made. That first day we had 2 hour waits between runs more than enough time for cool down. Of course at the time I did not know that is what I was doing.
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Melting Slicks
Joined: Jun 2005
Posts: 2,858
Likes: 1
From: Burlington County NJ
I am surprised at how many people can chirp 3rd and break tires loose??
let me ask this:
If you stomp on the gas in 1st, from a 5mph roll, do the tires spin (with traction control off)? mine sure don't - well they did when i needed new tires....
let me ask this:
If you stomp on the gas in 1st, from a 5mph roll, do the tires spin (with traction control off)? mine sure don't - well they did when i needed new tires....
Team Owner
Joined: Apr 2005
Posts: 35,769
Likes: 148
From: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
Originally Posted by vette-oholic
I am surprised at how many people can chirp 3rd and break tires loose??
let me ask this:
If you stomp on the gas in 1st, from a 5mph roll, do the tires spin (with traction control off)? mine sure don't - well they did when i needed new tires....
let me ask this:
If you stomp on the gas in 1st, from a 5mph roll, do the tires spin (with traction control off)? mine sure don't - well they did when i needed new tires....
O yeah with or without TC on.
FWIW I have hit at 20 with TC off and they will spin nicel
y
Melting Slicks
Joined: Jun 2005
Posts: 2,858
Likes: 1
From: Burlington County NJ
If i didnt already have my car to the track, I'd be concerned that mines not as "fast" as it should be... but I got the right numbers there.
i wonder if TM is more evasive in some cars then others...
O yeah with or without TC on.
FWIW I have hit at 20 with TC off and they will spin nicel y
edit: oops, i meant invasive, not evasive.
i wonder if TM is more evasive in some cars then others...
Originally Posted by 6spdC6
O yeah with or without TC on.
FWIW I have hit at 20 with TC off and they will spin nicel
yLast edited by vette-oholic; Jul 19, 2006 at 02:50 PM.
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by vette-oholic
...i wonder if TM is more evasive in some cars then others...
I've invested about 20 passes trying to find ways to minimize the effect of TM. But that's still a work in progress. The TM toll on the 1-2 and 2-3 shifts seems reasonably consistent. But the toll on launch is difficult to precisely differentiate from variation in launch rpm, clutch release, throttle squeeze and rack prep. But I certainly can feel TM cut power on the launch.
Ranger
