Happy holidays, everyone!
As some of you may remember, a 3.3:1 gear set has been a pet project of mine since at least 2008. So I'm happy to announce that I've finally found a reputable and relatively affordable source to manufacture race-caliber 3.3:1 ring and pinion sets for the Miata market.
A minimum of 15 paid orders are required to make this happen, but based on the number of inquiries I've already received, this will happen.
If you're active on multiple forums, you'll see me promoting this group buy on all of the ones that MiataRoadster sponsors. If interested in participating, you need contact me only once!
This is a bit complicated, so please carefully read the following then email me if you'd like to place an order or want clarification on anything:
BENEFITS OF THE 3.3:1 RATIO:
See the attached chart comparing various final drive ratios and transmissions. (Thanks to Brian Kelley.)
The manufacturer will provide me with a sample gear set to install and test by approximately the end of February 2014. Once it's approved, it will take about one month for the production parts to be completed. So best case scenario, don't expect to receive your set before March-April 2014. If you don't think you're patient enough to pay up front and wait that long, then please don't.
GROUP BUY PRICE:
$550 (MSRP after this initial group buy is expected to be at least $650)
Dealers are welcomed to contact me for wholesale pricing for group buy orders and future orders assuming there's enough demand to make these gears available in an ongoing manner.
To participate in the group buy, your payment in full for the gears (payment for optional upgrades is not required initially) must be received by Monday morning 12/16/13.
As the actual parts have not been made yet, the next best thing I can show you for illustration is the image above of a 3.6:1 Mazda gear set, which looks identical to the planned 3.3:1 except for the number of teeth on the pinion and ring gears.
SPEEDOMETER & ODOMETER DISPLAYS:
There's no solution for displaying accurate speedometer and odometer readings for this gear ratio with the mechanical speedo drive system used on the NA, so consider this gear ratio as for "off road use only." For the electronic speedo drive system used on the NB and NC, there are aftermarket options like the YellowBox synchronizer to modify the signal between the stock sender and the instrument cluster display.
Location of manufacturer: Taiwan
Manufacturing process: forging, CNC milled
Material: 8620 Nickel-Chromium-Molybdenum Steel
Treatments: carburized (AKA case hardened) heat treatment
Hardness: ISO 6508-1 Rockwell C Scale HRC 60-63
Tensile strength range: 700-1100 MPa
When we're closer to the ship date for the gears, I'll post a menu of optional parts and services that can be ordered later, as a separate purchase from the gear set. I can supply genuine Mazda rebuild components and kits (bearings, seals, input flange/harmonic dampener, etc.), ARP fastener kits, machined billet crush tube, reinforcement saddle caps, YellowBox, WPC treatment, cryogenic treatment, coatings, and installation services for NA, NB, and NC.
These are competition parts and, as such, no warranties are implied or offered. No refunds or returns will be processed once parts are shipped. In the unlikely case of a manufacturing defect preventing proper setup of the gears, a replacement gear set will be provided ASAP at my expense once the original parts are returned to me for inspection and deemed defective by me.
Email me at Bill@MiataRoadster.com
with your complete real name, your forum name (so I can cross-reference your identities and not count you multiple times), your complete shipping address, and I'll send you a quote to review and approve. Once you approve your quote, I'll send you payment instructions.
Thanks for your interest!