Technical Gearbox help

[lg249]

hi guys just wondering if the 0.9 gearbox will bolt straight onto the 1.1 engine on a 1998 sei sporting

Any help would be grand

Thanks

Speedy

 

[bozothenutter]

won't it make your car short geared?
Or is that the point?

 

[craigb244]

as far as i know there is no chance. its a "fire" engine. the engine is also mounted the other way

 

[Pep0]

Hi Criag

Nearly on the same topic, have you made any progress on final drives and differentials?

Noel

 

[fingers99]

899 box won't fit 1108. Even if it did, you'd need the 899 half shafts.

 

[Pep0]

There are compatible gear box options for different ratios, the Sei Sx and Sei MPI all have different ratios... there are 6 speed boxes, and a LSD group buy...

Noel

 

[fingers99]

The MPI Abarth also has a different overall ratio (but -- although it will fit and offers a sightly higher final drive, stay away from the non - Sporting, non - Abarth 1108 boxes -- they have wet inner pot joints and are, consequently, pretty fragile).

 

[Pep0]

hi 99

I was going to try a MPI sporting or have a gbox man transplant a higher final drive into my spare SPI sporting box.

But independent of that you are saying the Sei Sx has 'wet' inner drive shaft gaiters?

Noel

 

[fingers99]

Yeah. So you need different driveshafts and cables. I've got both knocking about, but would advise avoiding.

Of course, the easy way to raise overall gearing is bigger wheels/tyres, but then you have to have the torque to turn them.

 

[Pep0]

Ta

 

[lg249]

hi guys thanks for the replies.
yer the general idea was to lower the gear ratios, drop the top speed off and gain the acceleration off the line, any alternative ideas?

thanks again

speedy

 

[fingers99]

You could try an Abarth (genuine -- MPI) gearbox. They lowered the final drive to enable it to cope with 14" wheels, so if you use it with 13s..........

Straight bolt on fit, will have speed sensor rather than cable drive, but that should just be bolt for bolt if required.

 

[lg249]

hi, i have the 14" arbarth alloys on mine already, so im not sure if changing from the spi to the mpi gearbox will effect it really?
not sure.

 

[gp3000000]

Seeing as the Abarth gearbox was designed with the 14" wheels in mind, whereas the one currently in yours was designed for 13s, by fitting 14s on yours you are raising the overall gearing as they have a bigger diameter. Fitting the Abarth gearbox as well would bring back the gearing to what it should be. By both fitting the box AND going back down to 13" alloys, you would end up with lower gearing.

 

[fingers99]

:yeahthat:

 

[lg249]

ok thanks guys not sure if i will go through with it just yet it was just a random idea, but thanks for all your help its much appreciated