has anyone ever used a mazda mx5 diff in there kit car powered by a bike engine? will this work i dont know what ratio these diffs are its out of a 2003 car.

Triple Post!

sorry new to this im a cluts with computers! wont happen again.

the mx5 diff, i think the ratio is around 4.10, as far as i am aware off.

but i am sure people with more mx5 background will be a long.

i think most bec cars go for 3.18 or 3.34

hope that helps

and welcome to the forum

stuart

does the higher the ratio in numbers 4.10ratio make it easyer to turn than a 3.18 ratio diff? or harder to turn.

I have a couple of diffs from a 90 and 91 mx5 and "I think" they are 3.4

Are you talking about a differential or a steering rack? Or does a diff affect how the front wheels steer?

yes im talking about a rear differential wich drives the back wheels does the higher the ratio number mean its easyer or harder for the engine to turn the prop shaft round?

hi, i think the lower the diff ratio the quicker acceleration, and the higher the diff, more top speed but less acceleration, i think.

can some one confirm or shot me down.lol

i just had a mental block

thanks stuart sounds right to me hope my diff will be ok as ive got best part of my build done i know it seem a bit silly asking questions this late in my build but i only found this fourum about 3 weeks ago thanks again from mick.

Differentials

The higher the ratio number the greater is the number of turns of the tail shaft to turn the wheels once. For example, a 4.3:1 ratio, as in the NA6A models, requires 4.3 turns of the tail shaft to turn the wheels once. The 1.8 litre cars in the NA and early NB models had a 4.1:1 ratio; the NB8B had a 3.636:1 ratio. Once again the NB8A anniversary models were different; having a limited slip differential with a 3.909:1 ratio. Limited Slip Differentials available in the 1.6 litre models were viscous LSD's. The viscous LSD contained a silicone fluid. When one wheel began to spin it caused the fluid on that side to spin and in doing so becomes thick and transfers the motion to the other side of the differential. The 1.8 litre cars came with Torsen type differentials (4.1:1 in NA8A models and 3.909:1 in the NB Anniversary 6 speed models). A Torsen LSD uses parallel helix gears to keep the torque balanced to each drive wheel.
This might help

When I was choosing parts for my MX5 based car (not the engine), I was told that anything less than 4:1 wasn't going to work. An MX5 diff, out of a first generation, and a Nissan CA18DET engine works just fine!! Acceleration is incredible.

BEC? I would assume that you want less than a 4:1 ratio, or the gearing doesn't give you a very high top speed. I could be totally wrong, not that it could happen.