M12trans VS. MN6trans w/4.10 rear at the track questions
OK I've been looking for a built transmission to put in my 2000 FRC. Right now I have a MN6 in the car factory. I came across a member willing to sell me his M12 built tranny minus hardened main shaft. Curious as what peoples opinion of putting a M12 tranny in as opposed to the MN6 with 4.10 rear gears. Heres the gearing of the two transmissions.
Just give your opinion will it hurt at the track or help, pro's and con's of either will be helpful. Thanks
Bruce
__________________ My posts are to never be taken as Hostile or a Personal Attack
2008 A0 C6Z06 bolt ons only Best ET 10.34/ Best MPH 135.86/ Best 60ft 1.45-SOLD
2009 Cyber Grey ZR1-Just to piss people off!!! Drivetrain by RKT56.com
Monster clutches make me better than you cause my mom said so!
I'd imagine it would help, right? If it does you better get it, your gonna need every advantage you can get to keep up with me this year.
Please read the disclaimer in my sig sir.... and if you still think you're faster... please repeat step 1.
__________________ My posts are to never be taken as Hostile or a Personal Attack
2008 A0 C6Z06 bolt ons only Best ET 10.34/ Best MPH 135.86/ Best 60ft 1.45-SOLD
2009 Cyber Grey ZR1-Just to piss people off!!! Drivetrain by RKT56.com
Monster clutches make me better than you cause my mom said so!
I have the M6 with 4.10's and I LOVE it. The car revs fast! I get to about 40 in first, and 65 in second... so it isnt like you lose a lot in each gear. Obvisously the 4.10s are going to make the tranny work less so its easier on the clutch. I have heard the the MN12 wont handle what the M6 will. I dont know how true this is though. Why do you want to go to a MN12 anyways?
I have the M6 with 4.10's and I LOVE it. The car revs fast! I get to about 40 in first, and 65 in second... so it isnt like you lose a lot in each gear. Obvisously the 4.10s are going to make the tranny work less so its easier on the clutch. I have heard the the MN12 wont handle what the M6 will. I dont know how true this is though. Why do you want to go to a MN12 anyways?
I've been searching for a built RPM Level 5 transmission and may have found a M12 built transmission minus the hardened main shaft.
I'm also curious due to it was brought to my attention that the hardened main shaft is not recommended for avid dragracers with the 6speeds due to the flex in the regular shaft can be a good thing???
I've been searching for a built RPM Level 5 transmission and may have found a M12 built transmission minus the hardened main shaft.
I'm also curious due to it was brought to my attention that the hardened main shaft is not recommended for avid dragracers with the 6speeds due to the flex in the regular shaft can be a good thing???
I'm also curious due to it was brought to my attention that the hardened main shaft is not recommended for avid dragracers with the 6speeds due to the flex in the regular shaft can be a good thing???
OK I've been looking for a built transmission to put in my 2000 FRC. Right now I have a MN6 in the car factory. I came across a member willing to sell me his M12 built tranny minus hardened main shaft. Curious as what peoples opinion of putting a M12 tranny in as opposed to the MN6 with 4.10 rear gears. Heres the gearing of the two transmissions.
Just give your opinion will it hurt at the track or help, pro's and con's of either will be helpful. Thanks
Bruce
I have 4:10's with an MN6 and track my car.. I see only one disadvantage with my setup.. I will run out of gear in 4th at about 124mph.. so if you intend to trap higher (I dont trap more than 115).. Either go to a 3.73 or 3.90 with the MN6 or do the MN12
I have 4:10's with an MN6 and track my car.. I see only one disadvantage with my setup.. I will run out of gear in 4th at about 124mph.. so if you intend to trap higher (I dont trap more than 115).. Either go to a 3.73 or 3.90 with the MN6 or do the MN12
That theory is pending the RPM you are willing to rev the car to. I have a 7000rpm limiter set. I go through the traps around 6650rpms around 126-127mph. I shift at 6700-6800rpm. Going up to 6900rpm through the traps should result in approx 130-132mph. Keeping in mind the last 10ft are a averaging tool to determine your trap speed at a NHRA track. So you are going a tad faster through the trap. Both transmissions have the same 4th gear of 1:1. So final trap speed shouldnt' change but the shorter gearing in the 1st/2nd/3rd could either help or hurt the car at the track. So far I've only heard from 2 people that have the M12 and 4.10s and track results. Both have done well but feel the MN6 is superior final gear ratio with the 4.10s. I wish I had the money to put a 3.90 rear in the car and put the M12 trans in. I think that may be a nice combo. I'm starting to get really weary of running the 4.10s with the M12 gear ratios.
That theory is pending the RPM you are willing to rev the car to. I have a 7000rpm limiter set. I go through the traps around 6650rpms around 126-127mph. I shift at 6700-6800rpm. Going up to 6900rpm through the traps should result in approx 130-132mph. Keeping in mind the last 10ft are a averaging tool to determine your trap speed at a NHRA track. So you are going a tad faster through the trap. Both transmissions have the same 4th gear of 1:1. So final trap speed shouldnt' change but the shorter gearing in the 1st/2nd/3rd could either help or hurt the car at the track. So far I've only heard from 2 people that have the M12 and 4.10s and track results. Both have done well but feel the MN6 is superior final gear ratio with the 4.10s. I wish I had the money to put a 3.90 rear in the car and put the M12 trans in. I think that may be a nice combo. I'm starting to get really weary of running the 4.10s with the M12 gear ratios.
Thats about right. I tap the rev limiter at 6900 rpms and im just a tad over 130 mph in 4th gear. Knowing what I know about the 4.10s and the M6... I dont think I would want a shorter gear with the 4.10's. That wouls just make it no fun to drive to me because you are shifting way too much.
That theory is pending the RPM you are willing to rev the car to. I have a 7000rpm limiter set. I go through the traps around 6650rpms around 126-127mph. I shift at 6700-6800rpm. Going up to 6900rpm through the traps should result in approx 130-132mph. Keeping in mind the last 10ft are a averaging tool to determine your trap speed at a NHRA track. So you are going a tad faster through the trap. Both transmissions have the same 4th gear of 1:1. So final trap speed shouldnt' change but the shorter gearing in the 1st/2nd/3rd could either help or hurt the car at the track. So far I've only heard from 2 people that have the M12 and 4.10s and track results. Both have done well but feel the MN6 is superior final gear ratio with the 4.10s. I wish I had the money to put a 3.90 rear in the car and put the M12 trans in. I think that may be a nice combo. I'm starting to get really weary of running the 4.10s with the M12 gear ratios.
Great Point.. I did not realize you redline at 7000...did you build up your motor? or beef up the springs? My redline is 6250 but I set it to 6500 with LS1edit so I can shift at 6250 and not bump into the rev limiter.
That theory is pending the RPM you are willing to rev the car to. I have a 7000rpm limiter set. I go through the traps around 6650rpms around 126-127mph. I shift at 6700-6800rpm. Going up to 6900rpm through the traps should result in approx 130-132mph. Keeping in mind the last 10ft are a averaging tool to determine your trap speed at a NHRA track. So you are going a tad faster through the trap. Both transmissions have the same 4th gear of 1:1. So final trap speed shouldnt' change but the shorter gearing in the 1st/2nd/3rd could either help or hurt the car at the track. So far I've only heard from 2 people that have the M12 and 4.10s and track results. Both have done well but feel the MN6 is superior final gear ratio with the 4.10s. I wish I had the money to put a 3.90 rear in the car and put the M12 trans in. I think that may be a nice combo. I'm starting to get really weary of running the 4.10s with the M12 gear ratios.
most people forget that your trap speed is an average of the last 6x' of the run and not the speed you cross the stripe at. you pretty much said what I was going to post. I was just going to ask you the following:
what gear/RPM are you crossing the traps @ now
what size is your tire
what RPM can you safely rev too
what are your normal/average trap speeds
what rear do you have now
and finally how much power do you plan to add in the future
answer those questions and using a little math its easy to figure out if the MN12 w/or w/o teh 4.10's will help or hurt you times.
what gear/RPM are you crossing the traps @ now
what size is your tire
what RPM can you safely rev too
what are your normal/average trap speeds
what rear do you have now
and finally how much power do you plan to add in the future
answer those questions and using a little math its easy to figure out if the MN12 w/or w/o teh 4.10's will help or hurt you times.
Going through the traps by the track 126.5xmph on average/normal
actual speed is around 127.xx MPH
can rev to 7000 limiter-not willing to rev any higher
i have a built 4.10 rear now
tire size is ET street 26x11.5x16in (this tire swells as it goes down the track though keeping that in mind)
i want the car to be trapping around 30's NA with around 480-500rwhp-but that wont happen for sometime though.
I hope you're not going to use the calculators to figure RPM/MPH online. I have yet to find one that is remotely close.
Corvette Store
M12trans VS. MN6trans w/4.10 rear at the track questions
