fifty Reader
May 5, 2010 1:52 p.m.

EDIT: or would that be LOCOST... pardon the typo.

I've got a line on a complete Miata 1.6L drivetrain - it includes the rear subframe, diff and axles.

My first thought was "Locost!". I read the Ron Champion and Keith Tanner books several years ago and I'm familiar with the stock frame and the plus sized McSorley frames.

I've been perusing the www.locostusa.com forums to get some frame ideas - if someone info on a frame that is 2 inches wider than the "book" frame and incorporates the Miata subframe, I'd like to hear about it. Also, if you have some tips for stiffening the frame, such as using round DOM tubing to make the transmission tunnel, I'd like to hear it also.

I'll be welding this myself, just looking to get some good ideas before I dive into it.

Thanks, Iain

Dr. Hess SuperDork
May 5, 2010 2:05 p.m.

Do the Aussie Mods to stiffen it up.

Keith SuperDork
May 5, 2010 2:09 p.m.

I think the Gibbs book has a Miata-friendly option. I'm not sure.

Keep in mind that a "book" frame is already larger than a Lotus Seven, and a +2 is a really big car by these standards. The smaller frames are stiffer.

fifty Reader
May 5, 2010 2:21 p.m.

Thanks guys. Being an ex-pat Aussie, I like the doctor's prescription!

Keith - what dimensions are the CMC frame that you have? Same as the Ron Champion book frame?

Keith SuperDork
May 5, 2010 2:24 p.m.

Yes, my frame is a "book" frame with some alterations at the rear for the IRS and a (poorly) widened front track.

kreb Dork
May 5, 2010 2:45 p.m.

Bear in mind that even a generously sized Seveneque like the Stalker has rather narrow butt wells. Make sure that you fit what you build. That sounds basic, but I can think of a couple of builders who couldn't

Dr. Hess SuperDork
May 5, 2010 3:07 p.m.

Iain, if you venture west a few hours, you're welcome to come look at my build. From what I understand, a Miata drivetrain should fit a book chassis, no problem, with no need to go "plus size." My build is a book frame with Aussie Mods, up to the back end, then my own IRS design, plus my own suspension location points at the front. Dave Hempy did a Miata based build and just kinda hung the rear end up in the air and built frame around it until it all tied in, from what I understand. I saw his car in KC a couple years ago. The CMC Miata based frame "had issues." Of course, CMC "had issues" and that's why there's no CMC anymore.

You'll need to log in to post.

Also on Grassroots Motorsports

Born In Brooklyn: A Championship RX-7 From an Unlikely Place

4 hours ago in Articles

A Mazda RX-7 autocrosser from the middle of New York City.

GRM Live Tonight on Wednesday, June 28: The Science Behind Fasteners

13 hours ago in News

They hold all of your work together, but do you know when to use each type of fastener?

Your Projects: E46 M3 Transformation

17 hours ago in News

Watch this E46 M3 go from tuned street car to winged time trial racer in just one page.

You Need This: Indian Flat-Track Race Bike, Front Brake Optional

18 hours ago in News

We know, it's not a car but, still, it’s cool.

Autocross: It's a Jeep Thing

1 day ago in Articles

What’s a yellow Jeep doing on an autocross course?

Tech Tips: 2005-'14 Ford Mustang GT

1 day ago in Articles

Want to learn some speed tricks for the S197 Ford Mustang GT? We brought in an expert.

Removing Clear Bra From Project Rallycross Focus

1 day ago in Project Cars

Our latest to-do item was motivated by self-respect rather than speed.

2017 Ram 1500 Night Edition Crew Cab

1 day ago in New Car Reviews

Half-ton trucks are just getting bigger and bigger, aren't they. This Ram 150, dubbed "Night Edition," is really an optioned-out ...

Get Your Subscription Combo Deals!

1 day ago in News

Get both our magazines for the price of one!

Action Cam Guide

2 days ago in Articles

Capture your on-track memories with today’s latest and greatest

Reader's Ride of the Week: Troyer Modified Hillclimber

2 days ago in News

It's a circle track car that's been convinced to turn left and right, and go up hills.

You Need This: Track-Ready 1991 Mazda Miata for $5500

2 days ago in News

What’s better than a Miata? How about a Miata that’s ready for the track?

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
bTzuoysv4HGioWDTg53i8XQmYBvrKOWB