MX5Ireland

will 1993 1.8 diff and shafts fit into a mk1 1990?

im looking for more strength and reliability out of the diff as ive gone turbo.

also would the ratio be any different in the 1.8 diff to the 1.6?

cheers

yep, I have a 1.8 LSD (had a 1.8 open previously and kinda mangled 3 or 4 1.6 diffs), you'll also need the prop shaft (different length)... and thats it.
Ratios didn't change, am not sure which are lower/higher (6 speed cars def have different ratio), but you'll figure out your current one by rotating the prop shaft.

We have a few types of LSD and maybe a 6 speed type diff {ratio different} and shaft etc 086 8226506

rhysmate wrote:will 1993 1.8 diff and shafts fit into a mk1 1990?

im looking for more strength and reliability out of the diff as ive gone turbo.

also would the ratio be any different in the 1.8 diff to the 1.6?

cheers

ratios are different - 1.6 cars are all geared 4.3:1 , 1.8 car had 2 different gear types 4.1 or 4.3 depending what model it was.

If you fit a 4.1 or one from a 6 speed ( 3.6 or 3.9:1) then your speedo will not be accurate

Im pretty sure its only a 5 speed.. Did the 93s have a 6speed?

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Sorry for writing here, but ad I saw the topic i have a few questions as well:
I have a 97 jap import 1.8. The B2 Limited. How do i check if i have LSD? The other strange thing the logbook says automatic. I have a 5 gear manual. Can it happen they have changed the gearbox? The rev for the different gears very high. It does 4000 at 128 kmh in 5th gear. Thats more than my girl's 1.4 Astra... Any ideas? Thanks!


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rhysmate wrote:Im pretty sure its only a 5 speed.. Did the 93s have a 6speed?

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no...only 1.8 mk2 cars have the 6 speed box but these can be retro fitted to a mk1 as can the diffs

dont touch a diff from a 2001 onwards...they are fuji units and break easily

tiggerl82 wrote:Sorry for writing here, but ad I saw the topic i have a few questions as well:
I have a 97 jap import 1.8. The B2 Limited. How do i check if i have LSD? The other strange thing the logbook says automatic. I have a 5 gear manual. Can it happen they have changed the gearbox? The rev for the different gears very high. It does 4000 at 128 kmh in 5th gear. Thats more than my girl's 1.4 Astra... Any ideas? Thanks!


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auto to manual conversions can be done although its an arse of a job , ecu ,throttlebody , icv, loom gearbox etc all needs changed

Auto converted cars do tend to idle high if not done properly

charged_rs wrote:

rhysmate wrote:Im pretty sure its only a 5 speed.. Did the 93s have a 6speed?

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no...only 1.8 mk2 cars have the 6 speed box but these can be retro fitted to a mk1 as can the diffs

dont touch a diff from a 2001 onwards...they are fuji units and break easily

Cheers, the reason i ask is i have a diff from an earlier 1.8 and just needed to know if A) is there any point and B) will it fit.. and i think i got my answers

thanks again lads

You are probably going to want a Torsen diff too. Here is a guide that shows you how to tell the difference:

http://www.miata.net/garage/diffguide/index.html