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Author: Subject: Which MX5 gearbox for a Duratec?
John G

posted on 20/11/19 at 05:48 PM Reply With Quote
Which MX5 gearbox for a Duratec?

Having read a few threads on the MX5 mkIII gearbox, can anyone advise on the difference between the 1.8 bad 2.0 litre engine gearbox? Ratios strength etc.
Regards,Jon

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sdh2903

posted on 20/11/19 at 07:30 PM Reply With Quote
Needs to be a 5 speed. It's the same box in the 1.8 and 2.0. Designated the mk3 NC gearbox and the box is an N7 gearbox.

Ratios and more info here

http://www.roadster.blog/2013/07/roadster-transmission-drivetrain.html?m=1

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peter030371

posted on 20/11/19 at 10:17 PM Reply With Quote
I thought opinion was go for the 6 speed but don't bother using 1st. If 1st is 3.something with a duratec in a light weight car it's no use unless you are towing with it
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sdh2903

posted on 20/11/19 at 11:02 PM Reply With Quote
I had the 5 speed mated to a 2.0 ecoboost and a 3.62 diff and the 1st gear was absolutely fine, infact its a very well matched box to a duratec/ecoboost. the long first versions of the type 9 start at 2.98 so its hardly a million miles away, and the mazda box is around 1500 quid cheaper.

The 6 speed is bigger therefore slightly heavier, more expensive and not as strong as the 5 speed.

Ive also never been a fan of using compromised gear boxes and missing out 1st.

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peter030371

posted on 21/11/19 at 08:50 AM Reply With Quote
Just checked and I was thinking of the RX8 6 speed box, seems others have used this as a '5 speed' box as again 1st is not a suitable ratio.

Without knowing your tyre sizes and diff ratios plus your intended use (road, track or mix of both) its difficult to say 100% what will suit you only you can work that out

For your information I have a road legal but track focused Striker with a Duratec engine producing 189bhp on the rolling road. My gearbox is a type 9 with 2.39/1.56/1.26/1.00/0.87 ratios and a 3.92 diff. Tyres are 205/60/13 and it is just fine driving it in traffic and pulling away.

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