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

Join the Grassroots Motorsports Dyno Day

2 days ago in News

Join us for a dyno day in Sterling, Virginia.

From the GRM Vault: The Art of Understatement

3 days ago in Articles

The Harvey brothers dominated autocross in an obsolete Datsun a couple decades ago.

2017 Volkswagen Golf TSI SE

3 days ago in New Car Reviews

The quintessential European hatchback continues to pour out of Volkswagen's plants. Our test car featured four doors, a turbocharged 4-cylinder ...

We're Giving Away a $500 Race Ramps Certificate

4 days ago in News

Joining the drawing is totally free.

25 Project Path

5 days ago in Articles

A walk through 25 of our favorite project cars from the past.

Our Turbo Miata Goes Boom

5 days ago in Project Cars

Engine swap and suspension revamp before our race in two weeks? Challenge accepted.

The Ultimate Weekend Getaway for Your Car Club

6 days ago in News

Save a corral space just for your club at the Mitty.

Reader's Ride of the Week: V8 Jag

6 days ago in News

It’s a long-wheelbase 1974 Jaguar XJ6 fitted with a 350-cubic-inch Chevy V8.

Honing Cylinders

6 days ago in Project Cars

We hone our LS1's cylinders

Break Maiden

1 week ago in Articles

Creating a turbocharged road racing champion from a vintage Ford Mustang.

Meet Us at Sebring

1 week ago in News

We'll be at the Mobil 1 Twelve Hours of Sebring. Will you?

2017 Honda Accord Coupe Touring

1 week ago in New Car Reviews

Honda has been pumping out Accords for over 40 years now. Obviously they have a recipe that just plain works. ...

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

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

Learn More
vfKq2Bv1vfQ02VB7hFoDulMuyZFClpBl