How many of you guys run 400+ bhp on std. MT75 box?
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How many of you guys run 400+ bhp on std. MT75 box?
And how long time have you been doing that without issues?
Personally i think the durability and lifespan of the gearbox, has a lot to do with the way the car is driven, but i would like to hear your experience about this.
Maybe i'm totally wrong? I have not covered enough miles in my own car to have any experience with this, but i am aware of the problems i could or should i say will get? when running 400-450 ish on a standard box. So honestly i'm thinking about running with a lower boostpressure until i can afford a decent gearkit upgrade.
Personally i think the durability and lifespan of the gearbox, has a lot to do with the way the car is driven, but i would like to hear your experience about this.
Maybe i'm totally wrong? I have not covered enough miles in my own car to have any experience with this, but i am aware of the problems i could or should i say will get? when running 400-450 ish on a standard box. So honestly i'm thinking about running with a lower boostpressure until i can afford a decent gearkit upgrade.
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I'm running around 380 bhp / 450 Nm torque and no problems or strange noises. Don't know how the previous owner driven the car, but I'm always very carefull while shifting and NO launching starts and everything is still working.
Beside this I'm also thinking about a stronger gearkit for my future plans.
Beside this I'm also thinking about a stronger gearkit for my future plans.
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I ran mine on a t38 for 6mth then then went to a t4 with sweedish plenum etc car made 478hp and used it like that for another 6-7mth all with standard box and diffs and was fine.
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I had a re-built standard box. Fitted a gt30 turbo look it down the road and 2nd gear went BANG. Bit the bullet it the end and got a Fix-it gear kit built up by Bara. Not cheap but it's stayed in one piece so far.Just the diffs to do now
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mine is 375bhp and 375ft/lb and i bust my box about 2 weeks ago 3d went bang when i was given her a lot of beans tho
Last edited by paddyrs; 04-01-2011 at 12:55 AM.
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over 400 for 4 years and always had std trans....the box went bang not long after but the car had been running a t34.....this box has been in for over 3 years and (fingers x'd) is fine ...........ps it's the ft/lbs that kill the box but mine's doing ok at 390ft/lbs
Last edited by pete mcrash; 03-01-2011 at 10:18 PM. Reason: too add
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i run 345bhp and 400lb done 8 lanches at pod last time i was there and rear diff went but box still good, done 18000 miles that i no off. And no problems so far
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420 BHP/400 FT/LBS of torque in my car, standard box and diffs in my car with a front diff strengthening plate fitted, just over a year since I done my power upgrade, I had a t34.48 previously which made 326BHP/312 FT/LBS of torque and I blew two boxes
a lot of it is down to how the car is driven, if you drive any cosworth like an animal sooner rather than later something will break, standing launches at the pod will kill the diffs and large boost spikes will kill the gearbox particulaly 3rd gear.
as already said its not bhp that kills 4x4 boxes its the ft/lbs of torque that does it, any thing more than 300 ft/lbs of torque and you're living on borrowed time.
Big tooth gear kit is what is needed if you have a big power 4x4 to drive the car to its full potential, one will be going in my car as soon as the funds are available to me until then its applying a bit of TLC whenever I drive the car
Luciano
a lot of it is down to how the car is driven, if you drive any cosworth like an animal sooner rather than later something will break, standing launches at the pod will kill the diffs and large boost spikes will kill the gearbox particulaly 3rd gear.
as already said its not bhp that kills 4x4 boxes its the ft/lbs of torque that does it, any thing more than 300 ft/lbs of torque and you're living on borrowed time.
Big tooth gear kit is what is needed if you have a big power 4x4 to drive the car to its full potential, one will be going in my car as soon as the funds are available to me until then its applying a bit of TLC whenever I drive the car
Luciano
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420 BHP/400 FT/LBS of torque in my car, standard box and diffs in my car with a front diff strengthening plate fitted, just over a year since I done my power upgrade, I had a t34.48 previously which made 326BHP/312 FT/LBS of torque and I blew two boxes
a lot of it is down to how the car is driven, if you drive any cosworth like an animal sooner rather than later something will break, standing launches at the pod will kill the diffs and large boost spikes will kill the gearbox particulaly 3rd gear.
as already said its not bhp that kills 4x4 boxes its the ft/lbs of torque that does it, any thing more than 300 ft/lbs of torque and you're living on borrowed time.
Big tooth gear kit is what is needed if you have a big power 4x4 to drive the car to its full potential, one will be going in my car as soon as the funds are available to me until then its applying a bit of TLC whenever I drive the car
Luciano
a lot of it is down to how the car is driven, if you drive any cosworth like an animal sooner rather than later something will break, standing launches at the pod will kill the diffs and large boost spikes will kill the gearbox particulaly 3rd gear.
as already said its not bhp that kills 4x4 boxes its the ft/lbs of torque that does it, any thing more than 300 ft/lbs of torque and you're living on borrowed time.
Big tooth gear kit is what is needed if you have a big power 4x4 to drive the car to its full potential, one will be going in my car as soon as the funds are available to me until then its applying a bit of TLC whenever I drive the car
Luciano
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