esc cos gearbox what power and torque will it take
#2
Thats depends a great deal on the confition of the box itself, and how long its subejected to the loads for and how its driven.
There isnt a specific value at which it will suddenly break but at 1 lbft less it wont do that applies to all boxes.
Most people seem to consider them on their realistic limit at around 350-400bhp though.
There isnt a specific value at which it will suddenly break but at 1 lbft less it wont do that applies to all boxes.
Most people seem to consider them on their realistic limit at around 350-400bhp though.
#7
Originally Posted by Redkop
Agree with Dave and Alvyn.... I have about 370bhp on my Esc Cos and have had 2 rebuilds. The last one was after totally destroying the box.
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Originally Posted by chip-3door
Originally Posted by Redkop
Agree with Dave and Alvyn.... I have about 370bhp on my Esc Cos and have had 2 rebuilds. The last one was after totally destroying the box.
I've driven an Escos on standard gearbox with 400+bhp and very agressive antilag and after 2 hours of trashing around the track sideways and kicking the clutch it was still there. It broke it once or twice but only whenracing from lights.
Depends very much how much mechanical sympathy you have during shifts and a bit on luck. AFAIK MT-75 usually fails due to flex of one of the shafts on 3rd gear bearing. It used to be big problem on grp.N rallycars, so 3rd gear wheel and bearing was rebuild after each rally, but in a road car it can last a while or nothing depending on your style.
I wonder if someone found a limit at which mere aplication of full throttle will brake the box?
Bythe way - it's not the power but torque thatbrakes the box so you can have quite a lot of power but further up the rev range and still get away with that.
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Originally Posted by Turbosystems
The only guarantee that can be offered with an mt75 is that it will break
-Mazda 323 GT-R (brakes gearbox every time you depress throtle pedal)
-Subaru Impreza Turbo 94 spec
-Nissan Sunny/Pulsar GTi-R (niearly same as Mazda)
-Lancia Delta HF Integrale (same as others, lots of transmission failures)
You cannot compare it to very modern gearboxes like Evo gearbox or 6MT Subaru one. Escos one can be run at 400Nm range and last for many many miles - that is something!
#15
Originally Posted by Redkop
Azrael
Let's be honest.... the MT75 boxes are utter crap.
Let's be honest.... the MT75 boxes are utter crap.
Skyline? yeah
Evo? yeah
RWD cars? yeah
Most other 4wd cars? no
(see those listed by azreal for examples)
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Originally Posted by Redkop
Azrael
Let's be honest.... the MT75 boxes are utter crap.
Let's be honest.... the MT75 boxes are utter crap.
Gearshift quality is incredibly tractor-like but ou can live with that.
As I say - in early 90's homologation specials (remember they weren't designed like proper road cars are!!!) I'm quite fond of MT-75. Compared to Evo or STI gearbox it's utter crap.
#20
You won't change my mind on thinking they're crap, after all I've had to live with mine for 6 years and if I had enough money to get an uprated box.... I'd bin it tomorrow! They are sloppy long reach boxes with a huge weakness for stripping 3rd gear.
Hope no-one has the trouble I did a few years ago in trying to get a new 3rd gear, there wasn't one available in this country anywhere. My car was off the road for 2 months until I eventually sourced some in Germany and got a mate who lives there to get 2 for me.
Hope no-one has the trouble I did a few years ago in trying to get a new 3rd gear, there wasn't one available in this country anywhere. My car was off the road for 2 months until I eventually sourced some in Germany and got a mate who lives there to get 2 for me.
#21
Originally Posted by Bosch-Man
I think they break beyond there time because the driver cant drive properly
#22
Originally Posted by Redkop
You won't change my mind on thinking they're crap, after all I've had to live with mine for 6 years and if I had enough money to get an uprated box.... I'd bin it tomorrow! They are sloppy long reach boxes with a huge weakness for stripping 3rd gear.
Hope no-one has the trouble I did a few years ago in trying to get a new 3rd gear, there wasn't one available in this country anywhere. My car was off the road for 2 months until I eventually sourced some in Germany and got a mate who lives there to get 2 for me.
Hope no-one has the trouble I did a few years ago in trying to get a new 3rd gear, there wasn't one available in this country anywhere. My car was off the road for 2 months until I eventually sourced some in Germany and got a mate who lives there to get 2 for me.
#24
Originally Posted by Turbosystems
The failure of third gear main and layshaft is a fundamental design floor.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
So again, its not really anyworse than the other homologation specials.
Just ford forgot to install chocolate pistons to protect it
#25
Tony...it is more than adequate for the standard engine!!...In theory an engine/transmission part should have a certain over engineered aspect and that 4x4 box diffs etc are just that around 50% over engineered..i think people forget the 2wd was rediculously engineered but then it was built around a touring car.
So to say the box is crap is rediculous!
So to say the box is crap is rediculous!
#26
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Originally Posted by Turbosystems
The failure of third gear main and layshaft is a fundamental design floor.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
what kind of floor Tony?
Laminate?
Real wood?
Carpet?
you old c*nt!
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Originally Posted by chip-3door
They are crap compared to the engine they are mated to, thats the problem i think!
One can dare without problems to to full throttle launch in Escos, tune engine, use antilag and still get away with it. You won't get away with it on other similar cars of the era.
Because it's Granada/Transit gearbox it's simple and quite reliable if you know it's limits. Also you don' brake centre differentials, transfer gears, they don't split casings. Shifting is terrible quality but that's the price.
#28
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Originally Posted by chip-3door
Originally Posted by Turbosystems
The failure of third gear main and layshaft is a fundamental design floor.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
The box is nothing more than a old ford granada gearbox and is cheap for ford and not up to the job.
So again, its not really anyworse than the other homologation specials.
Just ford forgot to install chocolate pistons to protect it
Just ford forgot to install chocolate pistons to protect it
They only set this funny boost preassure and mapping...to protect it
#29
The original poster asked "what kind of bhp/torque will the 4x4 mt75 box take before it explodes" I think by the comments made so far that 350bhp is realistically the max, so Phil I don't think anyone is questioning that it's not suitable for a standard 220/227bhp car.
Anything over 350bhp is just a lottery really.
Anything over 350bhp is just a lottery really.
#30
Originally Posted by Redkop
The original poster asked "what kind of bhp/torque will the 4x4 mt75 box take before it explodes" I think by the comments made so far that 350bhp is realistically the max, so Phil I don't think anyone is questioning that it's not suitable for a standard 220/227bhp car.
Anything over 350bhp is just a lottery really.
Anything over 350bhp is just a lottery really.
And the more tickets (bhp) you buy, the greater your chance of winning a broken box!
#31
Originally Posted by chip-3door
Originally Posted by Redkop
The original poster asked "what kind of bhp/torque will the 4x4 mt75 box take before it explodes" I think by the comments made so far that 350bhp is realistically the max, so Phil I don't think anyone is questioning that it's not suitable for a standard 220/227bhp car.
Anything over 350bhp is just a lottery really.
Anything over 350bhp is just a lottery really.
And the more tickets (bhp) you buy, the greater your chance of winning a broken box!
#33
Regular Contributor
Thread Starter
thanks for all your help
the car has 400+ bhp and around 440 lbs of torque so ill be getting another box for a spare
still i cant belive the price for an up-rated gear kit thats just stupid, what makes them so expensive?
the car has 400+ bhp and around 440 lbs of torque so ill be getting another box for a spare
still i cant belive the price for an up-rated gear kit thats just stupid, what makes them so expensive?
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Small production volume and the fact that they are hand-made not mass produced. Material and machining prices are a factor too.
You can keep buying standard boxes, but at this power if you want to have any fun fromt he car I don't think it's good idea. You will be wondering with each change from 1st to 2nd if THIS is the last time or not yet...
You can keep buying standard boxes, but at this power if you want to have any fun fromt he car I don't think it's good idea. You will be wondering with each change from 1st to 2nd if THIS is the last time or not yet...
#35
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MT75
I replaced my box in my car because third gear started to crunch, i got a replacement mt75 box from ford and had it fitted, it lasted just over 5k and just over a year so i was fooked with the warranty, third gear completely shreaded, i have put another mt75 in the car from ford and i,m scared to boot the car now incase it eats the box, big horsie power in 4x4 cosworths=drive train headaches, quaife box is the long term solution its just costs a lot money
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#36
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Originally Posted by esccossie666
still i cant belive the price for an up-rated gear kit thats just stupid, what makes them so expensive?
#37
Regular Contributor
Thread Starter
also is there anyway to make 1st longer without messing with g/box ratios?
can you change the step off gear or diffs to do this?
as its a big turbo first just seems sh@t
maybe i just need to launch it
can you change the step off gear or diffs to do this?
as its a big turbo first just seems sh@t
maybe i just need to launch it
#38
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the cost of an uprated box is not alot of money really if people only think about it, its such a shame people see the engine as the heart of the car, then all the hard earned goes on the motor, the people whinge because the gearbox shits it self
for the region of £2500 buys you a decent used quaife big tooth box, some people will spend that on a fookin turbo ffs, as for the shift being bad, thats just a design to aid drivability i,e reduce noise and nvh
if you want decent shift quality you need one of these
as for the box ability to handle power , i would say it takes a midges over 330 ft/lb in a quick boost time to shred 3rd gear, which is not surprising when you see its profile
for the region of £2500 buys you a decent used quaife big tooth box, some people will spend that on a fookin turbo ffs, as for the shift being bad, thats just a design to aid drivability i,e reduce noise and nvh
if you want decent shift quality you need one of these
as for the box ability to handle power , i would say it takes a midges over 330 ft/lb in a quick boost time to shred 3rd gear, which is not surprising when you see its profile
#39
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Originally Posted by esccossie666
also is there anyway to make 1st longer without messing with g/box ratios?
can you change the step off gear or diffs to do this?
as its a big turbo first just seems sh@t
maybe i just need to launch it
can you change the step off gear or diffs to do this?
as its a big turbo first just seems sh@t
maybe i just need to launch it