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Home > Help Needed / General Tech Chat > fitting 1300gt gearset into a later a+ box

welshdan

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s wales

5th Jul, 2009 at 07:03:12pm

hi does anyyone know whats involved in this conversion?

would be looking at doing this, what would the benifits be?

would this be suitable on a fast road mpi cooper with a 3:1/3:2 diff?

help apreciated, cheers

Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

5th Jul, 2009 at 07:06:54pm

I belive the MPI has a close ratio gearset,

i think the 1300gt came witha close ratio gearset too, if it did the lay gear will be marked 22g1040.

esentially theres not much point.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Vegard

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Chief ancient post excavator

Norway

5th Jul, 2009 at 09:55:30pm

GREAT MOD!! It's extremely easy as all the GT bits will fit straight into the A+ casing.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

welshdan

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Member #: 1111
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s wales

7th Jul, 2009 at 12:52:22am

what difference would be noticed with the cr gearset?

would it make that much difference?

hopefully will be using a 1360 engine, around 80-90 bhp

cheers

paul wiginton
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9 times Avon Park Class C winner

Milton Keynes

7th Jul, 2009 at 07:26:04am

The only real benefit is a stronger gearset.
Its not a straight swap though. The centre main web needs relieving to make clearance for putting in the main shaft.

Paul

I seriously doubt it!

fab

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Parisien Turbo Expert

Paris\' suburb

7th Jul, 2009 at 08:22:21am

as Paul stronger gearset,
though, the clearance will depend which 1275gt gearset you have, the older14mm input shaft will need as the main shaft is longer, if it is the later 18mm input the main shaft is the same as an A+, so will fit straight.

Fabrice


On 7th Jul, 2009 paul wiginton said:
The only real benefit is a stronger gearset.
Its not a straight swap though. The centre main web needs relieving to make clearance for putting in the main shaft.

Paul

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

7th Jul, 2009 at 08:42:47am




On 7th Jul, 2009 paul wiginton said:
The only real benefit is a stronger gearset.
Its not a straight swap though. The centre main web needs relieving to make clearance for putting in the main shaft.

Paul


Please elaborate? I've fitted several A gearsets in A+ boxes and have never relieved anything.

The best with this conversion is not the stronger gears but the closer ratios. The A+ ratios are junk for a modified car, including forced induction ones.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

paul wiginton
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9 times Avon Park Class C winner

Milton Keynes

7th Jul, 2009 at 09:40:45am

Ive had to relieve the case a few times to do it, I believe Fastcarl did too.
I dont know about the Mpi ratios but it was quoted earlier theyre similar

Paul

I seriously doubt it!

fab

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Parisien Turbo Expert

Paris\' suburb

7th Jul, 2009 at 10:35:02am

Veg just read:
as said, depend which gearset you have, their is two possiblilitys, earlier have 14mm input shaft inner bearing with lond main shaft which need casing mod to fit, later gearset have 18mm input gear bearing with short (A+) main shaft,
then their is NO benefit over mpi gearset which is already a close ration (gt/s type ) one.
Appart from the fact that it is much stronger (then I should shut this as they are already a pain to source), than the later a+ one, I run one from over one year whith regularly, 15/18 psi, and it continu to go just fine, Jukka did use this gearset too, and some racing guys use it when straight cut aren't allowed


On 7th Jul, 2009 Vegard said:


On 7th Jul, 2009 paul wiginton said:
The only real benefit is a stronger gearset.
Its not a straight swap though. The centre main web needs relieving to make clearance for putting in the main shaft.

Paul


Please elaborate? I've fitted several A gearsets in A+ boxes and have never relieved anything.

The best with this conversion is not the stronger gears but the closer ratios. The A+ ratios are junk for a modified car, including forced induction ones.

Vegard

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Chief ancient post excavator

Norway

7th Jul, 2009 at 10:54:03pm

Ah, at the first motion shaft end.. Yes, possibly.

I've rebuilt some Mpi boxes, and none have been CR. I believe this is bollox. Imagine how tall 1st would be if this was the case.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

fab

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Parisien Turbo Expert

Paris\' suburb

8th Jul, 2009 at 08:03:22pm

No vegard it isn't possible, it's for SURE.
then the mpi gearset, although the ones I have ( perhaps they made a special danish one ??? *happy*) are close ratio


On 7th Jul, 2009 Vegard said:
Ah, at the first motion shaft end.. Yes, possibly.

I've rebuilt some Mpi boxes, and none have been CR. I believe this is bollox. Imagine how tall 1st would be if this was the case.
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