just finished off my gearbox conversion(r33 gtr vspec) the otherday,got an mot ready for this years show season.
it was quite involved but its worth it as i have broken far too many mt75's in the past and this box is alot stronger and as a plus i can switch it to rwd if needs be or adjust the torque split via a potentiometer

 

it looks the bee`s m8
wots it knock ya?
pm me if u dont wana post

jay

 

anymore details on the car mate? looks great

 

sweet

 

good job have you any better pics of the box mods with dimensions so it helps other people to do this conversion ,me being one of them please

 

its an awesome conversion, After having a R33 GTR myself I would say the gearbox will be 1000 times better than the old one.

 

all built by me,originally mapped by dave walker at emerald

ENGINE

3.0ltr twin turbo cologne 12v v6
kentcams v6t45 cam kit
7.25 to 1 compression 94mm arias forged pistons
cosworth 24v crank
melling m328 high flow oil pump
world products re-worked heads
increase valve size with sodium filled exhaust valves
ported inlet manifold
12.9 headbolts and hardened washers
arp bolted rods and mains
all lightened and balance
garrett t2 60 trim turbos x2
grs intercooler
autocross boost hoses
t.a.s twin dump valves
turbosmart boost controller
re-cored copper rad
kenlowe twin fans
emerald k3 ecu
motorsport 3 bar map sensor
homemade 36-1 crank trigger wheel
24v cosworth coil pack
formula power ht leads with thermal velocity plug boot insulators
440cc siemens deka injectors
walbro 255 intank fuelpump
fse fuel adjustable 1 to 1.7 fuel pressure reg
homemade magnaflow 2.5" stainless 304 straight thru exhaust system 1 silencer

TRANSMISSION

nissan skyline r33 gtr vspec gearbox with input shaft modified and mt75 v6 bellhousing welded to it.
homemade torque split controller 4wd or 2wd
daikin r33 gtr twin plate pull type clutch
homemade hydraulic clutch pedal conversion with ap racing master
2 x nismo cooler pumps with oil coolers and inline 100 micron filters
custom front and rear propshafts
3.14 turbo technics front diff
3.14 lsd rear diff

SUSPENSION AND BRAKES

avo gtz coil overs 450ftlb front and 350ftlbs rear
compbrake compression struts
compbrake lower adjustable arms
powerflex polybushed rear beam
cheap hi-spec big front brake kit (will be changing asap)
grooved front and rear discs
ebc yellow stuff brake pads
goodridge brake lines
motorsport developments rear diff mount
escort cosworth rear anti roll bar
revoloution millenium 17x8 wheels
yokohama AO48 245 40 17 semi slick tyres

INTERIOR

stripped
safety devices bolt in roll cage
bimarco expert 6kg seats
4 point momo harnesses
homemade centre gauge pod
2x innovate lc-1 to xd16 wideband afr gauges
various autometer phantom II gauges

EXTERIOR

ford rs sideskirts
ford rs front and rear bumper aprons
ford rs rare but ugly front grill
comedy bonnet scoop
escort mk? fibreglass autocross wheel arch extensions



last rolling road graph,run at 21psi but now running upto 29psi
300bhp and 400ftlbs torque 236bhp atw

 

Awesome gearbox mods !

 

400ftlbs torque thats mint.

I like the gearbox conversion too.

 

any more pics of the conversion please mate,how much did you have to cut out where the centre diff is to clear the gearbox,im thinking of doing the same conversion to my mk4 escort estate over this winter but havnt got much space inside the car where the seat is to the tunnel and the hump for the centre diff

 

Nice mods

 

yeah you do have to cut a fair chunk out but the lump is still far from my seat edge,it may be tight if the mt75 lump is close to your current seat,you will have to fabricate your own craddle,the usaul drivers side mount point is completely removed







you can see here that i have used the standard ford lefthand mount point but made the craddle righthand mount meet the floorpan where it is still double skinned,that side is L shaped with 3 bolts.



if you want to see more then i have a project thread on the xroc, but i would start at the end and work backwards as there is quite a bit on the thread.
http://www.xrstyle.co.uk/forums/showthread.php?t=17340

 

cheers mate will have a look at mine when i go out to the garage,looking at it have you not had to cut the gear lever hole back just forward

 

just been on your post about this box some very good info there mate im very intrested in doing this mod one day to my focus cosworth

 

well you have to cut a little from the rear but more from the front.

 

on reflection after doing this conversion,i would say the most important and most hassle is just making the box fit the engine correctly,actually fitting the box is easy part of the job.I have done a few miles in it now and rwd is somewhat fun, but i need to do get down to a rolling road and measure the torque split versus ets pressure then i can get to a track and see if its actually any better than the mt75 viscous coupling.

 

Ditto Ditto !!!!!

 

cool

 

me to got my box just need to save some cash now

 

excellent news mr.c
i have been out tonight testing my new vw egt set-up which links into the emerald k3,works a treat,i'm still dizzy from seeing how fast i can go round a big roundabout in an industrial area near me,playing with the torque split to see how it handles and its good.

 

excelent job mate.

 

I had a bit noise from the rear diff after some traffic light grand prix the other day so I had a spare couple of hours this morning,i pulled the rear diff apart,only to be faced with broken planet gear teeth!!........bugger

good news though as the rare and exspensive 3.14 crown wheel and pinion are ok its just the rest thats fubared,I have been giving some stick in rwd since i have put the skyline box in,and the planets gears have decided they dont want to play anymore.

there is also a bit too much play on the rear driveshaft to cv joint splines,so these will get changed aswell,not to sure which way i will go with the diff rebuild but a quaife atb would be great to stop it happening again, but they are Ł550+vat on top off a seal/bearing kit.







the case has a bit of damage,but is re-useable its just witness marks from broken teeth being wedged up the side of the crown wheel.

 

Next step, new diffs?

 

Or dear.....You have made a mess of that.

 

tvr rear diff ?

 

I may look into a different rear diff but being 4wd I would have to match my current 3.14 ratio,or play with the transfer box ratio,I have not really looked but it is easier to stick with a ford 7 inch,car will be back on the road quicker,even if i have to rebuild with standard lsd again.

 

you can run a 2wd rear diff in a 4x4 the viscous will take the diffence up

 

hes on a 3.14 ratio graham, so any std diff will not do unless its the same ratio.

 

 

yep correct if i run a different ratio diff then i would soon wear out the skyline transfer clutch plates,I think ford did produce a 3.14 7.5 inch but its probably even more difficult getting hold of one of those's than the 3.14 7 inch,the kit car v8 guys love these 3.14's and it has pushed the price up on 2nd hand units,there's one on ebay at the moment,bog standard old open 7 inch 3.14 diff Ł475!!!

 

remember this diff has had a lot of abuse over the years and 2wd probably pushed it over the edge.
is it worth trying another 7" std ford diff? can you swap the crownwheel?

 

what car did they put the.3.14 diff into mate?

 

yeah its old,the 3.14 crown and pinion can be swapped onto any 7 inch diff, but I think there's no point replacing with standard planet gears and an atb is much stronger, double the bhp and almost triple the torque,I would be worried everytime I push the car that i would break it again.its just as i'm making things stronger the weak components show up.

 

mainly 2.3 diesel sierra's

 

Great conversion there.

 

cheers,its always an ongoing project!

 

Turbo Technics used the 3.1 diffs in the Minkers

 

yep i believe they where an option on the 280's and standard on the minkers,turbo technics had the front crown and pinions custom made as ford did not produce a 3.14 front diff,the rear diff was off the shelf from ford.

 

woops
i had 1 last month well my mum did till i crached it
it was a sierre estate went like s~~~ of a shuvel

Nice mod with the box i got to send this off to mu dad

 

my car on the rollers setting the torque split and testing the 2wd mode