M6 vs M12 for drag racing
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,836
Likes: 110
From: El Paso TX.
M6 vs M12 for drag racing
which is a better choice for the 1/4. i know the 1-3 are steeper on a m12 but is the 3rd to 4th drop off too much. the setup is heads, cam, and spray with 3:90 gears.
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,836
Likes: 110
From: El Paso TX.
Melting Slicks
Joined: Apr 2003
Posts: 2,285
Likes: 16
From: Nashville TN
I have been running a MN12 with 3.90 gears and recently swapped to a MN6. I have not been back to the track yet, but I feel the MN6 will be better. With the MN12 the first 2 shifts come so quickly, the car barely has time to stay in the power band. Plus I am in fourth before the 1/8 mile, so that is 3 shifts in 7 seconds. I think my new combination of the MN6 and 27" tires will be perfect for me. If you don't want to change trannies, you might consider going to a larger tire.
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Drifting
Joined: Dec 2005
Posts: 1,720
Likes: 3
From: East Hampton CT
Transmission ONLY, the M12 would be a better accelerating/drag racing tranny (besides the various weaknesses that have been discussed in the MN12, I think shift forks and synchro disks are part of them).However, if you have non oem ratio diff gears (3.73, 3.90, 4.10)...then the MM6 is your better bet due to the better 1-4th gear spacing and "sturdier" transmission.
Last edited by Billdog350; May 7, 2008 at 02:57 PM.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
You people are driving me nuts (
) with your mis-use of the transmission RPO codes .......
MM6 is the "standard" six speed manual transmission
M12 is the "Z06" six speed transmission
There is no MN12 transmission ..... there is no MN6 transmission .......
MN6 is an RPO that is ordered for ANY Corvette built with a manual transmission. It means the car is equipped with a clutch pedal, a clutch master cylinder ... etc.
If you have the M12 transmission you have RPO MN6
If you have the MM6 transmission you have RPO MN6
If you keep your RPO data correct, then the SEARCH function in products like Google or AltaVista will return more accurate data.
) with your mis-use of the transmission RPO codes .......MM6 is the "standard" six speed manual transmission
M12 is the "Z06" six speed transmission
There is no MN12 transmission ..... there is no MN6 transmission .......
MN6 is an RPO that is ordered for ANY Corvette built with a manual transmission. It means the car is equipped with a clutch pedal, a clutch master cylinder ... etc.
If you have the M12 transmission you have RPO MN6
If you have the MM6 transmission you have RPO MN6
If you keep your RPO data correct, then the SEARCH function in products like Google or AltaVista will return more accurate data.
Race Director
Joined: Jul 2007
Posts: 10,961
Likes: 2,643
From: Texas Hill Country
pics won't load over my work network so I will have to see the graph at home. if the curves are flat then get a 6 and if they are peaky then get a 12. if you are spraying then the tq curve should be flat and long. 6.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
Yes ... it is a direct swap ... the M12 has a temperature sensor screwed in where the FILL plug is located .... you can leave it in place and just not wire it .... or put the plug in place and leave off the temperature sensor ....
And your Dyno ...... something wrong with it .... the torque and HP curves are crossing in the wrong location .... by definition they have to cross at 5252 RPM ... that chart looks way closer to 6000 RPM .... bogus ......
Last edited by BlackZ06; May 8, 2008 at 02:17 PM.
Race Director
Joined: Jul 2007
Posts: 10,961
Likes: 2,643
From: Texas Hill Country
I can't see the pic but make sure the HP and TQ are on the same scale (on the sides). If they are not they won't cross at 5252. Classic observatory mistake. Again, I can't see the pic from work so I am not sure.
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
I talked to Rodney at RPM Trans about this last summer when I was getting my Trans done on my Coupe. His opinion was that the MN6 is much better suited for Drag Racing, but I forget his explanation...however since RPM knows their stuff and specializes in Trans, I tend to follow their advice.
You might want to give them a call
You might want to give them a call
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,836
Likes: 110
From: El Paso TX.
Geeez .... it is a FREAKIN M12 and MM6 ... as posted above ....
Yes ... it is a direct swap ... the M12 has a temperature sensor screwed in where the FILL plug is located .... you can leave it in place and just not wire it .... or put the plug in place and leave off the temperature sensor ....
And your Dyno ...... something wrong with it .... the torque and HP curves are crossing in the wrong location .... by definition they have to cross at 5252 RPM ... that chart looks way closer to 6000 RPM .... bogus ......
Yes ... it is a direct swap ... the M12 has a temperature sensor screwed in where the FILL plug is located .... you can leave it in place and just not wire it .... or put the plug in place and leave off the temperature sensor ....
And your Dyno ...... something wrong with it .... the torque and HP curves are crossing in the wrong location .... by definition they have to cross at 5252 RPM ... that chart looks way closer to 6000 RPM .... bogus ......