4x4 mt75 gearboxes realistically how week?
12-12-2008, 06:25 PM
#1
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4x4 mt75 gearboxes realistically how week?
whats the most bhp people have run without banging one.. with the odd launch, no dounuts or track days just avarage fast driving? and for how long.. is a t38 a good turbo to use with one.... as its less harsh than a t34?
just wondering what bhp i should run in my escort, ive got full in car 2 stage adjustable boost so i can go anywhere from 300bhp to 440bhp with my engine build.
cheers
weak... lol bad typing
just wondering what bhp i should run in my escort, ive got full in car 2 stage adjustable boost so i can go anywhere from 300bhp to 440bhp with my engine build.
cheers
weak... lol bad typing
Last edited by dom123; 12-12-2008 at 06:27 PM.
i know this because my mum just said so!
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12-12-2008, 06:41 PM
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Think on stage 3 it depends what other work has been done like head work i.e polished and porting etc,injectors, which will make a bit of difference on power outputs tbh think the gearbox will last to about 400bhp just depends how you drive,if your gonna lauch it hard ad give it a week tops lol
lol
12-12-2008, 07:27 PM
#27
my own 4b runs 380bhp and has a shot peened box by gordon spooner ,i dont launch the car to be honest and let it buildup a bit before giving it some .Is shotpeening the answer for a good stage 3,and what kinda power do you need to be running before you have to go to a bara box?
cheers james
cheers james
12-12-2008, 07:36 PM
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my own 4b runs 380bhp and has a shot peened box by gordon spooner ,i dont launch the car to be honest and let it buildup a bit before giving it some .Is shotpeening the answer for a good stage 3,and what kinda power do you need to be running before you have to go to a bara box?
cheers james
cheers james
shot peening can make a massive difference if done properly but most people who do shot peening dont really do it properly tbh. if i can find someone to take apart and rebuild my box im going to shot peen and superfinish my gears
12-12-2008, 07:40 PM
#31
i am amazed that shot peining makes such a difference, shot peining essentially work hardens the surface of the material, increasing brittleness, but also offers a certain degree of stress relief and possibly aids lubrication due to surface finish
12-12-2008, 07:42 PM
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Think a good map might prolong ya box a little n all nice smooth progressive wivout a massive boost spike a think thats what its called anyways lol 
12-12-2008, 07:48 PM
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my own 4b runs 380bhp and has a shot peened box by gordon spooner ,i dont launch the car to be honest and let it buildup a bit before giving it some .Is shotpeening the answer for a good stage 3,and what kinda power do you need to be running before you have to go to a bara box?
cheers james
cheers james
best 4x4 box i've ever had and gotta remember that car was used on track also by its original owner & he busted endless gearboxs before he had that 1 rebuilt and shot peened
12-12-2008, 07:51 PM
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your pretty much spot on there, i do shot peening for a living. F1, oil industy and aerospace though so proper shot peening.
not sure i agree with brittleness, by shot peening you are reducing residual stress to the surface by applying compressive stress which increases fatigue resistance and stops cracking etc. the surface finish you end up with is dependant on the intensity and shot size, i sometimes batter things to make the surface finish rougher.
12-12-2008, 08:03 PM
#38
your pretty much spot on there, i do shot peening for a living. F1, oil industy and aerospace though so proper shot peening.
not sure i agree with brittleness, by shot peening you are reducing residual stress to the surface by applying compressive stress which increases fatigue resistance and stops cracking etc. the surface finish you end up with is dependant on the intensity and shot size, i sometimes batter things to make the surface finish rougher.
not sure i agree with brittleness, by shot peening you are reducing residual stress to the surface by applying compressive stress which increases fatigue resistance and stops cracking etc. the surface finish you end up with is dependant on the intensity and shot size, i sometimes batter things to make the surface finish rougher.
i hope i am pretty close to the mark as i have worked in aerospace for the last 11 years, lol
with hardness comes brittleness, i have seen components that have cracked off the surface effected by the peening
p.s. just out of interest, who do you work for, we currently use a company in Derby who shall remain nameless who are shite!
Last edited by Twellsie; 12-12-2008 at 08:06 PM.
12-12-2008, 08:12 PM
#39
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