ZZP Builds The Best LNF Mod Ever!
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Joined: 02-09-09
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From: Tejas
Actually, I remember GM "magically" re-rating the tranny when GMS1 came out, so it may not be rated at 260 ft-lbs anymore.
Not saying it'd make much of a difference, but it may raise the rated+safety margin number, considering GMS1 makes like 340 ft-lbs at the crank on paper I think it was.
Not saying it'd make much of a difference, but it may raise the rated+safety margin number, considering GMS1 makes like 340 ft-lbs at the crank on paper I think it was.
What do you mean by *capable*? Sure, it can handle that torque for a while, but at some point it WILL succumb to the excessive forces. Let me ask you this...at what point then, is the tranny being stressed? Common sense tells me a tranny *rated* around 240 ft lbs WHEEL torque is good for another 50% MAX as a margin of safety. Ya, I pulled that outa my ****...but it makes good sense to me. You can't use a *forgiving* clutch with that power..certainly not stock. That alone will transmit more stress and you can't do anything about it. All that torque has to go some where...and that's to the tranny, axels and wheels. You wanna roll the dice at 400 ft lbs on a stock tranny? Go for it.
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Joined: 05-13-09
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From: Davie, Fl
What do you mean by *capable*? Sure, it can handle that torque for a while, but at some point it WILL succumb to the excessive forces. Let me ask you this...at what point then, is the tranny being stressed? Common sense tells me a tranny *rated* around 240 ft lbs WHEEL torque is good for another 50% MAX as a margin of safety. Ya, I pulled that outa my ****...but it makes good sense to me. You can't use a *forgiving* clutch with that power..certainly not stock. That alone will transmit more stress and you can't do anything about it. All that torque has to go some where...and that's to the tranny, axels and wheels. You wanna roll the dice at 400 ft lbs on a stock tranny? Go for it.
TWIN DISC CLUTCH INFO
Excessive torque will not only damage gears in your transmission but nearly everything that transmits power to the pavement. You can usually get away with shoving a ton of torque into a transmission that wasn't designed for it but eventually you're going to find that nothing is truly bulletproof.
When choosing your clutch make sure that you choose a clutch that has an appropriate torque capacity for the application. This value should be about 20% more torque than what your engine makes at the crankshaft. but no more than 50% higher than the fatigue/endurance limit of the transmission. Using a clutch that is past the recommended torque capacity will greatly reduce the service life of certain drivetrain parts.
Listed below are the fatigue limits for some of the Mitsubishi transmissions. The fatigue limit is also known as the endurance limit and it is considered to be where fatigue related failures will not happen for at least 100 million cycles as long as the transmission is in good working order with proper bearing preloads, correct oil and with gears that aren't worn out or making abnormal contact patterns. It is important to note that while most automotive transmissions can be subjected to loads that are 50% greater than their rated capacity these shock loads must be kept to a minimum for long life
Yep..50% greater than LNF rated at 240 ft lbs (wheels)= 360 FT LBS TO THE WHEELS.
Second.... using and aggressive clutch can also cause problems too..a *Catch 22*. Stock clutch won't hold and clutch rated at 500 WHP may transmit too much into the tranny!
Last edited by ronn; Mar 27, 2011 at 11:37 PM.
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Joined: 10-31-09
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From: the darkness
Staying with stock tranny and 400+WHP? Why would anyone want to put the tranny at risk for another 50-100HP? Bragging rights? I'd rather have 100 HP less knowing I can hammer it whenever I please...rather than grit my teeth and pray every time I get on the gas with 425 Ft lbs being unleashed on a tranny *rated* at 240ft lbs and maxed at 360ft lbs (wheel torque).
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Joined: 06-03-08
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From: Grand Rapids, MI
Staying with stock tranny and 400+WHP? Why would anyone want to put the tranny at risk for another 50-100HP? Bragging rights? I'd rather have 100 HP less knowing I can hammer it whenever I please...rather than grit my teeth and pray every time I get on the gas with 425 Ft lbs being unleashed on a tranny *rated* at 240ft lbs and maxed at 360ft lbs (wheel torque).
hmmm....
ya mean you play you pay
I think a lot of people looking to get this mod need to *get that*.
I saw responses here that had people thinking they could bolt this on a relatively stock car and go on their merry way with no consequences..in fact I was one of em (lurking
). It's now apparent that a tranny update is a must. I see you guys are set to provide that as well....to those who can afford it of course.
ya mean you play you pay
I think a lot of people looking to get this mod need to *get that*.
I saw responses here that had people thinking they could bolt this on a relatively stock car and go on their merry way with no consequences..in fact I was one of em (lurking
). It's now apparent that a tranny update is a must. I see you guys are set to provide that as well....to those who can afford it of course.
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Joined: 05-27-09
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From: In the mountains
Let me just say ---
This thing is just nasty on E ..
Thats all
We have a Sweden Tranny, **** is bullet proof already. NOTE: On my last car (2004 SVT Focus) with 430 Whp and close to 460 lb/tq I daily drove her for nearly 2 years and never did the tranny took a crap. Only thing I ever had to change was the cluth to a stg 3 and that was all.
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Joined: 03-02-09
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From: The Buckeye State
We have a Sweden Tranny, **** is bullet proof already. NOTE: On my last car (2004 SVT Focus) with 430 Whp and close to 460 lb/tq I daily drove her for nearly 2 years and never did the tranny took a crap. Only thing I ever had to change was the cluth to a stg 3 and that was all.
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Joined: 01-13-09
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From: South Carolina
So, why not get the selectable tune - You can have 360 lb/ft tq for daily driving and 400-425 lb/ft tq for short spirited runs??? If you are not constantly ******* on it I don’t think that it would tax it all that much. If you have sticky tires and are hard launching at every red light then yea, it’s going to shorten its life but not everyone drives like that.
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From: The Buckeye State
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From: Scottsdale, AZ