Upgrading Gearbox
Turbo Mini Forums

Hi all I was going to take my gearbox somewhere to have it upgraded to straight cut gears.

Take a look at this link on ebay would this be suitable for my 1989 turbo.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...:MEWA:IT&ih=019

I was going to take it somewhere to get it fitted to the engine, I have the Cross Pin Diff on my engine now as my daily driver and im running 8psi but want to run 10. I got advised to upgrade to straight cut gears because there stronger but dont real now what I am looking for.

Thanks for looking Chris

dont forget to buy some staight cut drop gears aswel.


mikey

Hi,
Beware, that company as far as I know from a previous post on here, just fit the gearset to an old box. They don't replace any of the bearings....
Cheers,
Gavin :)

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My Mini build diary

icklemini is somone that iv only heard good things about gearbox rebuilds, in fact does anyone know his email addy?

if so could you pm me please.

sorry for the thread hijack but it is sort of related!

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

Are you sure you need straight cuts at that boost? I'd personally spend the money on a properly built helical and the change on making the car handle a little better.

just my 2ps worth

Every day is a school day ...........

How fast and how expensive ...... the same question...

to be honest I dont realy know what gears are best for me I was just told buy the R+R Enginner that if I wanted to run 10psi as a daily driver I would need to upgrade the gearbox.

Now I have some spare cash I was going to buy one newly Built ready for when mine fails.

Can you recommend a gearbox and clutch for my standard engine and wheres best to buy from?

I got £700 to spend

I'd go straight cut, it will be better in the long term if you wish to up the boost and increase the power etc in the future.

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

i have straight cut box and drops. i've done long distances and dont mind the noise BUT they do wear out quick so in my opinion not a great idea for a daily drive. mine showed signs of wear after 5,000miles and its a JKD gear set

Id Say a rebuilt helical with a 4pin diff and SC Drops.

Ive asked the question before, i think this was the general consensus but ill stand corrected.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

If it is a daily driver I'd go for a fully (ie. properly by hogster or somebody similar) rebuilt gearbox using an MPi gearset or an S gearset (do a search for ratios and TurboDave and you'll find a good ratio chart).

Make sure the case and transfer case is all in good nick then use the standard drops with quality bearings and again make sure it's all as it should be.

A 4 pin diff is esential IMHO. Use a higher final drive if it's a true daily, I'm going for 2.7 in Candice's car but 2.95s are easier to get hold of and a good choice.

The box will be quiet, smooth and reliable. Anything upto around 140BHP will be fine so long as you don't launch it off every set of lights.

I personally find SC gears unbearable (to the point I get a headache after about 20 mins!!!!). Others say they can live with them.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Brilliant so Hoster can rebuild me a box I will send him a PM.

Will £700 be sufficent to buy the drops bearing and the rebuild? I already have a x pin diff I fitted it when I was putting the engine in.

I only want to run about 120 bhp but I have reconed the head and fitted an uprated alloy billet actuator and a calibra turbo charge cooler at the mo

Hi,
You should have plenty of change from £700 :)
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

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Edited by RogerM on 6th Sep, 2007.

Every day is a school day ...........

How fast and how expensive ...... the same question...

having just installed a mini its straight cut gear set in mine , i can definately say that its no louder in 4th than it was before ,1st 2nd and 3rd sound like a big supercharger , which i quite like ,and 4th is silent , so for cruising along it is no prob .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Shit Happen's

Really Rob ..... interesting .... mine were Min-Its supplied too (where else???) and they were LOUD!!!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

sc gears will show signs of ware but doesnt mean the are worn out though, my drops have looked the same for years with slight piting on the teeth but havnt got worse, they must be 10-11 years old now, but gear set is 7 years old and doen fair few miles but the same again pitting marks along the teeth but has been the same for years.

no probs about building you a box mate but i wont garentee a helical box on a turbo lump.

personaly i would save a few more pennies go sc right thorugh, because you will end up anyway with a engine running more boost than that after a few yaers if not quicker.

one lesson i learnt from mat woods is when you have so much you always want more and he is right.

first its 10 psi then 12 then 16 then 20.

but if you want one built then no probs.

labour cost is the same for either so its upto you mate.

always looking for them bigger bunches of bannanas

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I think s/c would be the ones I need because Im running 8psi now and I want to run 10psi so Im properly going to want to increase the boost further in the future.

I just need to know my limits if im going to be using the car daily.

What sort of boost would my standard engine cope with the s/c box.(as daily driver) and an upgraded clutch.

Everything seems to be in good order with the engine. I havnt had any problems other than having to set the timing.

are you running an intercooler yet?

and are you running a verto or a pre verto setup?

Im running a charge cooler from a calibra turbo. Im not sure what type of clutch setup it is. Its just standard 1989 metro turbo.

With that clutch set up I'd think you'd struggle to transmit more than about 130ft/lb of torque ...... you could do the mod robert has done if you need to carry a bit more than that.

I've always said that if your on the verto clutch there is no need for SC gears as the clutch will slip before the box goes!!!!

Every day is a school day ...........

How fast and how expensive ...... the same question...

So if I am going for the s/c gears I will have to upgrade to pre verto setup aswell. I will look into getting that done aswell just take my engine to hogster. I have pm him. Thanks for your advise guys.