omega0684
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| posted on 20/12/05 at 12:54 PM |
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mt75 vs type 9
hey guys and gals, im planning my build and intend to use a 2.1 litre pinto with fr32 cam and max flow head, with twin 40 dcoe webbers. i have got a
cossie rear axle with 3.62:1 ratio lsd.
i need help with my gear box choice, which is better the type 9 or the mt75, i have both in my garage at the moment but i dont know which to use, what
are the pro's and cons of each? and wot prop shaft do i use?
All help welcome
Kind regards
Alex
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smart51
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| posted on 20/12/05 at 12:57 PM |
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which weighs less? Less is better.
What speeds will you get in each gear, with each box? At what road speed will peak power be achieved in top gear?
Which can you sell for more money if you keep the other?
Which is in better condition (will be more reliable)?
Which will fit your kit?
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ditchlewis
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| posted on 20/12/05 at 01:45 PM |
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I believe that the type 9 is the smaller box so good if space is at a premium in the transmission tunnel, whilst the MT75 is the stronger box.
so if there is space use the stronger box.
ditch
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Mr G
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| posted on 20/12/05 at 02:04 PM |
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Try the SEARCH Facility.
http://www.locostbuilders.co.uk/viewthread.php?tid=27425
http://www.locostbuilders.co.uk/viewthread.php?tid=12493
http://www.locostbuilders.co.uk/viewthread.php?tid=10534
http://www.locostbuilders.co.uk/viewthread.php?tid=29477
http://www.locostbuilders.co.uk/viewthread.php?tid=22681
Normal is getting dressed in clothes that you buy for work and driving through traffic in a
car that you are still paying for - in order to get to the job you need to pay for the clothes
and the car, and the house you leave vacant all day so you can afford to live in it.
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mookaloid
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| posted on 20/12/05 at 02:08 PM |
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Either box will be strong enough for a pinto engine.
You may wish to build your chassis so that it will take either in case you want to upgrade to a more powerful motor later.
it would be worth checking the ratios as the standard Type 9 1st gear is a bit low so if the MT box ratio is a bit higher it might be worth going for
that box first.
HTH
Mark
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Liam
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| posted on 20/12/05 at 03:09 PM |
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I'd go for the MT. Stronger and a nicer gear change and should be lighter. Whatever you use you'll have to have a prop shaft made. The
prop company will ask what box, what diff and how long, and that's it.
liam
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Mr G
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| posted on 20/12/05 at 03:21 PM |
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quote:
Originally posted by Liam
I'd go for the MT. Stronger and a nicer gear change and should be lighter. Whatever you use you'll have to have a prop shaft made. The
prop company will ask what box, what diff and how long, and that's it.
liam
I hope they ask 'What postal address?' 
Normal is getting dressed in clothes that you buy for work and driving through traffic in a
car that you are still paying for - in order to get to the job you need to pay for the clothes
and the car, and the house you leave vacant all day so you can afford to live in it.
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zetec
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| posted on 20/12/05 at 04:44 PM |
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If it's of help I use a MT75 from a DOHC Sierra with a 3.62 diff and 15" 195/50 tyres.
Speeds @6500rpm 2nd = 60-65mph
3rd = 90-95mph
5th gives about 23mph per 1000rpm
1st is low in both 'boxs but still usable, snatch 2nd at about 20-25mph and 2nd drags you up to near the legal limit if need be.
Can't remember what 4th does.
The only way around the low 1st is to fit a modded type 9 with long first and close ratio gear set, this works out about £500 including new bearings
and a general freshen up. MT75 cannot have new gears fitted but of the two it is my choice as it is very robust, nice change and the gear lever is
very easy to extend back to get the correct place in the car.
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alan wheeldon
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| posted on 21/12/05 at 06:18 PM |
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Ive got a type-9 running my standard 2.0 pinto and on the motorway its horrible, im doing about 70mph and its reving its nuts off.
Is there different ratio type-9 boxes? ie. 1.6 1.8 2.0 engines. If so i think i might be using the wrong one??
Built black pinto MK, black blackbird MK, yellow pinto MK. Now working on a Sierra.
logicaltuning.com (a new web site about cars and bikes)
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iank
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| posted on 21/12/05 at 07:27 PM |
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quote:
Originally posted by alan wheeldon
Ive got a type-9 running my standard 2.0 pinto and on the motorway its horrible, im doing about 70mph and its reving its nuts off.
Is there different ratio type-9 boxes? ie. 1.6 1.8 2.0 engines. If so i think i might be using the wrong one??
What ratio diff and what wheels/tyres are you using as that sounds like be the problem.
I don't think changing the gearbox ratios would help (4th is 1:1 on both I think and 5th won't be much different 0.82 on type 9 IIRC).
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alan wheeldon
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| posted on 23/12/05 at 07:15 PM |
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15" alloys and a 4x4 lsd
Built black pinto MK, black blackbird MK, yellow pinto MK. Now working on a Sierra.
logicaltuning.com (a new web site about cars and bikes)
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NS Dev
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| posted on 27/12/05 at 05:29 PM |
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maybe revcounter wrong then!!!!
I have used a stock sierra 2.0 type 9 in my old rally car on a 4.6:1 ratio atlas axle and that was fine at 70 (ok was revving but not that bad!) and
you only have a 3.62:1 diff....................
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britishtrident
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| posted on 27/12/05 at 11:02 PM |
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quote:
Originally posted by alan wheeldon
Ive got a type-9 running my standard 2.0 pinto and on the motorway its horrible, im doing about 70mph and its reving its nuts off.
snip
You must be running much too short a final drive ratio ---
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locost_bryan
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| posted on 28/12/05 at 02:29 AM |
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quote:
Originally posted by britishtrident
quote:
Originally posted by alan wheeldon
Ive got a type-9 running my standard 2.0 pinto and on the motorway its horrible, im doing about 70mph and its reving its nuts off.
snip
You must be running much too short a final drive ratio ---
... or your speedo's not calibrated right - maybe you're doing more than 70? 
Find out your tyre size, diff ratio, and gear ratios, then visit this site
http://www.customspeedparts.de/content/en/technic/getriebeberechnung3.php to calculate the road speed for each gear.
Bryan Miller
Auckland NZ
Bruce McLaren - "Where's my F1 car?"
John Cooper - "In that rack of tubes, son"
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alan wheeldon
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| posted on 28/12/05 at 03:10 PM |
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the speedo and rev counter are fine, it wouldnt have got through the SVA otherwise??
I think i must just be running the wrong gearbox for the engine??
Built black pinto MK, black blackbird MK, yellow pinto MK. Now working on a Sierra.
logicaltuning.com (a new web site about cars and bikes)
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rusty nuts
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| posted on 28/12/05 at 03:24 PM |
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4th gear in all type 9 boxes is a 1 to 1 ratio 5th is in effect an overdrive around .9 to 1 . Changing the gearbox will have no effect on revs/road
speed . The final drive ratio / rolling radius of tyres will have an affect .
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Peteff
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| posted on 28/12/05 at 04:37 PM |
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You notice it because the silencer is next to you and it sounds busy. What revs are you actually doing at 70mph in 5th? There should be plenty left to
go at.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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alan wheeldon
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| posted on 30/12/05 at 04:38 PM |
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it does about 4 to 4.5 revs in 5th gear about 70mph. I thought that was high or is that about right for a 2.0 pinto??
your right about the exhaust as well being right next to you, it sounds much louder
Built black pinto MK, black blackbird MK, yellow pinto MK. Now working on a Sierra.
logicaltuning.com (a new web site about cars and bikes)
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zetec
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| posted on 30/12/05 at 10:50 PM |
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That does sound high, I would have thought you shound be aiming at 20-23mph per 1K at least. The Pinto being a torque engine for this car, you should
be looking for 25mph per 1000rpm.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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MikeRJ
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| posted on 31/12/05 at 01:51 AM |
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quote:
Originally posted by alan wheeldon
the speedo and rev counter are fine, it wouldnt have got through the SVA otherwise??
I think i must just be running the wrong gearbox for the engine??
SVA dosen't check the accuracy of your rev counter!
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