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Changing Diff Ratio in SP
Posted: Sat Mar 18, 2017 3:32 pm
by roshmx5
Has anybody done this and their opinions. Just went in a friends NC with a 4.3 fitted and the torque was great.
Your advice would be appreciated.
Re: Changing Diff Ratio in SP
Posted: Sat Mar 18, 2017 5:23 pm
by smy0003
NC has an NA 2L engine and different gear ratios, you can't compare final drives between your car and his/hers. The Americans pay a lot of money to source 3.6 diffs (what you have) they suit the turbo torque nicely.
Re: Changing Diff Ratio in SP
Posted: Sat Mar 18, 2017 5:40 pm
by The American
If you have an SP, I can't imagine wanting less than 3.6. I already find first gear is too short.
Maybe you need more power!
Re: Changing Diff Ratio in S
Posted: Sat Mar 18, 2017 5:52 pm
by roshmx5
Thanks so much guys, really appreciate it. Sorry I have so many questions I am new to the MX5 scene.
Re: Changing Diff Ratio in SP
Posted: Sun Mar 19, 2017 12:13 am
by BadBong
Rosh, I've got an SP and I've dríven it with every diff ratio available.
On stock power, I would suggest that you change it to 4.1 LSD diff.
If you ever get more power, I would suggest that you go back to a 3.6.
4.3 is just too short (unless you really like to change gears...)
Re: Changing Diff Ratio in SP
Posted: Sun Mar 19, 2017 12:52 pm
by roshmx5
Thanks mate, I will be keeping stock power, glad to hear from someone that has done this. Great hat you have tried a few different diffs. Much appreciated.
Re: Changing Diff Ratio in SP
Posted: Sun Mar 19, 2017 6:02 pm
by Tezzax5
For what it's worth I've changed mine to a 3.9 torsen.... Helps keep the revs sensible for highway cruising. Don't forget to change the speedo sensor if you decide to change ratios.