4.77 gear for 1.8 miata?

[madrabbit15]

After racing a 1.8 SM for two years I can say with much certainty that a 4.1 is not optimal on any of our tracks here in the SE. You want at aleast a 4.3 on any of the tracks we race in the SE I would think. You would want to go to a 4.77 at RA as it is straight drag race out of turn 7. Maybe even the same at VIR because of Oak Tree.

I agree with Bowie that with Roeblings long sweeping corners where you have to be smooth, you probably want a taller gear, but I still think that 4.1 is a little too tall. I have raced against a similarly prepped 1.8 with a 4.3 and the difference was noticable.

[pitbull113]

Thanks for all the input guys. I guess I'm searching for a 4.3 r&p.

[TStiles]

Bringing this back from the dead :

I currently have a 4.1 Torsen in my 95 ITA Miata , running a Stahl header that makes good HP up top , but gives up some TQ down low ... We're adding a MSPNP and Louie R is tuning this week help that.

My primary tracks are TWS 2.9 CCW , MSRH CW , MSRH CW

The 4.1 is terrible @ MSRH CW

The 4.1 is less terrible @ MSRH CCW

The 4.1 is less than perfect @ TWS 2.9 CCW

I've heard many conflicting opinions about which gear , but we all agree the 4.1 is less than optimal

Any other thoughts ?

[red986s]

I bought my 1.6 with a 4.10 and hated it! I was always above or below my power band in the corners and I ALWAYS got my butt kicked on the start. I switched to a 4.77 (Kia Sportage R&P), Megasquirt, and upgraded the header. It completely transformed the car!

Granted, it's a 1.6 and the MiDiv tracks I race are shorter and more technical. I shift a lot more but I've learned to adjust. My times have really improved and I'm getting podium finishes.

Don't forget there's a 4.44 R&P out there to.

[iambhooper]

Have I read everything correctly... if I have a 1.6 and want to change from the 4.3 to a 4.44, I can find a R&P from a 1st gen Rx7? I usually find myself at VIR or CMS, I think the 4.44 should help keep the rpms up in the slow corners.

Thanks in advance!

[Matt93SE]

The 1.6 diff is a smaller ring gear diameter- you'll need to use the 1.8 housing. At that point, lots of stuff will just bolt right in.
http://www.miataturbo.net/diy-turbo-...-post-4288/#13

[iambhooper]

But would that be IT legal?