An introduction

Old Colt · Post by **Old Colt** » Mon Dec 04, 2006 12:44 pm

I have been around the Mitsu drivelines for over thirty years now. Kind have learned a bit that has been of little interest to many until the web has been making the world smaller.
I run a fabrication shop and specialize in modifying most anything, cars,planes, anything. I have been doing engine swaps since the mid 70s and have a few going now. For one I am building a 6G75 DOHC. I expect there are not many of them around yet.
I have been lurking about on this site for a few months, It may be time to stick my nose in.

screemin eagle · Post by **screemin eagle** » Mon Dec 04, 2006 8:08 pm

ive seen your mirage before i must say that is some baddass stuff you got going on there

GRNDSM · Post by **GRNDSM** » Tue Dec 05, 2006 3:06 pm

Welcome to the site, Charlie!

Wow, finally someone who has been into Mitsus longer than myself! My first Mitsu was ’86 Starion ESIR, which I bought in ’89 (for $5500, talk about depreciation!). Since then, I had a two more Starions, but DSMs have became my passion!

But I have had my fill of racing DSMs, so for now, I am building a 4G63 powered TR7.

Where in Vermont are you? I am in northern Mass, which isn’t very far! Also, check out our local New England Club DSM: www.newengdsm.org/forums which is a pretty hardcore bunch of guys.

Old Colt · Post by **Old Colt** » Tue Dec 05, 2006 3:33 pm

Hi Leon,
I am in East Wallingford. Up the hill from Okemo Mt.
It will be interesting to see a good engine in a TR7, shoud not be a bad swap.
What rear axle you going for or are you going to wait and see before you swap it out.

GRNDSM · Post by **GRNDSM** » Tue Dec 05, 2006 4:04 pm

Looks like you are around two and a half hours away.

Originally, I looked into using Starion IRS (since I had one from my ’88 donor car and I wanted to keep things in the Mitsu family). But it was way too big and too heavy. So instead, I found a ’94 Miata rear end assembly:

That will give me IRS, rear disc brakes and an easy option for LSD.

Unfortunately, I have been expanding the scope of this project. So I am going to scale it down and focus on things that are really important: getting the car to run THIS spring!

I am going to delay roll cage and rear end construction until next winter. So for now, I am just going to use the existing TR7 rear end, which should give me one wheel drive

.

Why, what do you have in mind?

Old Colt · Post by **Old Colt** » Tue Dec 05, 2006 4:24 pm

A Miata rear is not a bad choice, they will take a moderate amount of power and are a nice package to work with. Do pay good atention to mounting the nose of the diff. I have both seen and heard of a few that scimp there and tear stuff apart. Plus you have the larger axles and diff from the Honda S2000 that drop in that housing.

GRNDSM · Post by **GRNDSM** » Tue Dec 05, 2006 5:28 pm

Soo... should I just skip a few steps and just get an S14 rear end?

BTW, Charlie I appologise for hi-jacking your thread

Old Colt · Post by **Old Colt** » Tue Dec 05, 2006 7:08 pm

Yah lets see a search find this one in the future.

How much diff to put in really gets down to a balance of how much torque. How much grip. And will in need to deal with full on standing starts.
I work with road course setups and we can get by with lighter bits even with standing starts at some of the events. For one our tires do not have full grip at a launch and the drivers no that an event with corners in it is never won at the start but can be lost there. My Mirage will come down a straight with all four tires spinning in third gear. But even hard launches are not a big issue even though the rear end is the same size as came in a 71 Colt.

So in the case of your car, are you going to be running 25psi boost into drag tires?