BigD New Reader
May 11, 2010 11:59 a.m.

Hi guys,

To summarize, I have an E30 with an S52 that's receiving a major power upgrade this season. I currently have an E28 3.25 in there and I'd like to change it out to something nicer. I'll be going with a custom unit from diffsonline but I'm curious what you guys would recommend. This is a track only car.

I'm going to change to a 2.93 gear and for the carrier, I'm thinking: 1) Quaife 2) OS Giken 3) custom 30/90 ramping

Any input, especially based on first hand experience, would be very appreciated.

Thanks! D

Woody SuperDork
May 11, 2010 12:35 p.m.

Wanna sell the old diff?

BigD New Reader
May 11, 2010 12:36 p.m.

I would but he'll want it as a core.

Woody SuperDork
May 11, 2010 12:40 p.m.

Thanks anyway. I just noticed the whole "Canada" thing and realized that it would probably be a customs hassle.

BigD New Reader
May 11, 2010 12:45 p.m.

Yeah, shipping + customs would probably be close to the diff price. Actually when I bought it, I had it shipped to a parcel place in Niagara Falls. It wasn't until I got there that I realized what I'd done. It's run by a pair of little old ladies. Thankfully they just left it where the poor UPS guy dumped it by the door, hah.

Brotus7 Reader
May 11, 2010 2:14 p.m.

Hey, Jeff. Do you want an E30 diff....?

My brother is pulling the 2.73 out of his car and putting in a 2.93 LSD. I'd expect him to be throwing out the old diff.

May 11, 2010 2:39 p.m.

A 2.93!? What trans are you running?

I have a track-only S52 with a ZF from an E36 M3 (1:1 5th) that I run a 3:46 LSD w/ 50% lockup squeezed in. It is an almost perfect combo for strong acceleration everywhere but with enough top end to pull all the way to the brake zone on the back stretch at the Glen or the front straight at Summit with a 7250 rpm redline.

A 2.93 would be awful IMO unless you had 500lb/ft of torque - and then it would break the axles.

BigD New Reader
May 11, 2010 2:42 p.m.

If everything pans out then it should be putting down 550-600 ft lbs to the wheels. My 3.6 M5 topped out at 230-240 at MoSport, I can see this car running out of gearing long before the end of the straight with the ZF (about 250). Axles hold up fine unless you're a drag racer/power shifter. But an MZ3 rear end will be joining the diff, although that's mainly for the wider wheelbase for the bigger meat, with fatter axles as bonus.

jstein77 HalfDork
May 11, 2010 2:53 p.m.

GRM (actually Ian Stewart) did a diff article last year on an S2000. Not sure, but I think the OS Giken was the one they chose. Somebody with a better memory than mine recall that one?

BigD New Reader
May 11, 2010 2:57 p.m.

I remember that write up, which is what made me think OS Giken is the only way to go. But a very respectable birdie told me that they're really not all that great and they all come with the same setup, regardless of model, so they need further development to work best in a given application. So now I'm not sure again. The same person told me that a stock carrier with a 30/90 ramping is actually best. So I'm curious what others think that take their cars to the track? If you chose a quaife or another torsen over a clutch pack, or vice versa - how come? (esp if you've tried both)

CLNSC3 Reader
May 17, 2010 5:05 a.m.

If you have the money you can't go wrong with OS Giken!

You'll need to log in to post.

Also on Grassroots Motorsports

Classic Motorsports Mitty Presented by Hagerty Celebrates Porsche

12 hours ago in News

Gearhead heaven? We think it looks something like this.

First Drive: Turbo ND MX-5

2 days ago in News

We hit the track with Flyin' Miata's latest power adder.

This Weekend at the Mitty: The Ultimate Auto Festival

3 days ago in News

Gates open this Friday for the Classic Motorsports Mitty at Road Atlanta.

ND Miata Turbo Kits Now Available!

3 days ago in News

Add 70 horsepower and 70 ft.-lbs!

What's the Plan, Man?

4 days ago in Articles

Thoughts on our racing plan for the year.

Meet the Rebels Who Started the Cannonball Run

5 days ago in News

Relive those desperado days through movie excerpts, and hear the real facts and wild stories from the legends themselves.

Up for Auction: All of Level 5 Motorsports's Hardware

5 days ago in News

It's a pro race team part out.

Can You Really Live With a Low-Buck Porsche 911?

5 days ago in News

For the past two years, on of our forum regulars has been chronicling his life with a Porsche 996.

Project Turbo Miata: Fire Fighting

6 days ago in Project Cars

We transfer the fire system to our new Miata.

Reader's Ride of the Week: Autocross Abomination

1 week ago in News

Classic British styling with a rotary engine?

AMX-Cessive

1 week ago in Articles

If you’re going to host the search for the ultimate street car, perhaps you should drive one yourself.

Chris Albin’s Flying VW Golf: What Really Happened?

1 week ago in News

What really happened to send Chris Albin's VW Golf flying?

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

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

Learn More
g3xTIjySewRGEDaQDmdlxcaJKG8vlyvc