axle ratio

[green beastie]

Can any one tell me , what the axle ratio is on a 19198 1.6 MX 5

and also the gaer ratio for 5th gear,

regards GB

[green beastie]

Ohhh forgot to ask, what is the ..lowest ratio.. available, which will lower the rpm,

ratio,s and mph x rpm please

Marcus

[offroading.net]

don't know the ratios for the rear diff but I know a 1.6 auto has the lowest ratio

[green beastie]

Thanks for that,
But can any one say what the auto ratio is, and how many mph x 1000rpms

I need to get the revs down

Marcus

[MX-5 Lazza]

Why do you need to get the revs down?

[green beastie]

Hi Lazza, I want the revs doon , because I think it is vastly under geared for normal road use in 5 th gear

as I see it, I got 2 options,
1, lower the back axle ratio,
but this will lower the revs in every gear,, which in its self is no so bad,
as the torque of the engine will pull in the lower gears,

2, put in a 6 speed box,
but this will have to have a higher gear than the 5th has now, this will still leave all the other gears alone,.


if a corsa 1.2 can pull 21 mphx 1000rpm
and a 1300/1500 spitfire can pull 22 mph x 1000 rpm

both with a lot less GG,s than the MX, then I think the revs can be lower, also will get better cruising mpg

At the moment it just seems to be far to ..bizzy.. for my liking

regards Marcus

[the muppet]

I suspect that the diff you need will be the 'highest' available, gut feeling would be 18i with 5-speed box - - flame suit primed tho

[MX-5 Lazza]

When talking about gear ratios - longer gears and smaller numbers i.e. a 4.1 dif will be revier than a 3.6 dif.
It's a ratio to 1 i.e. 4.1 to 1 i.e. 4.1 turns input for 1 turn output.

I think what you aren't taking into account is the torque curve. A Corsa and maybe the Spit I suspect the torque curves put peak torque at lower revs than in the MX5. MX5s peak torque is over 5.5krpm and they don't really have a lot of torque below about 4krpm. If you make the gearing longer you might find you don't have enough torque to accelerate in top gear at motorway speeds.

[green beastie]

Thanks , well noted, ,

Im well aware of the the way it works, just did nae no the ratios avaiable,.

on me old GT there are 5 available !!!

from 3.27 to 4.55

so one to suit every thing

Marcus

[green beastie]

Found a site called fling miata, , and its got al the info i need

think a 3.63 is what im after, as this will give a bit more relaxed cruise.


so any body got one, and will it fit straight in !!!!!

Marcus