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Old 01-13-2003, 03:45 AM   #1
Patrick Olsen
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Question Anyone using a Quaife front diff in their auto-x/open track beastie?

My '97 2.5GT has completely stock diffs, which means open diffs front and rear. I don't mind the rear open diff, but I think the front diff really hurts me. It's not at all uncommon to have the car spin the unweighted inside front tire severely coming out of slow, tight corners. I'm sure running the stock soft springs and struts isn't helping - that will be remedied later this year. But even when I was running DMS Golds, which aren't nearly as firm as some coil-overs out there but are significantly firmer than stock, I would get that inside front tire to light up.

So, I always hear great things about Quaife torque-biasing diffs, how they really "pull" FWD cars through the curves under power rather than understeering like a pig. And they're supposed to be quite nice on our cars, too, seeing as much of the cornering behavior is FWD-ish. But I have yet to read any actual testimonials about the Quaife.

In addition to the basic question about how well (or poorly) a front Quaife works, the other question I have is whether or not it would be a big mistake to have only a front TBD, leaving the rear a stock, open diff.

Thanks for any inputs...
Pat Olsen
'97 Legacy 2.5GT sedan
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Old 01-14-2003, 02:42 AM   #2
Patrick Olsen
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52 views and no replies? C'mon, someone has to know something about these diffs!

Pat
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Old 01-14-2003, 08:00 AM   #3
KC
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Quote:
Originally posted by Patrick Olsen
52 views and no replies? C'mon, someone has to know something about these diffs!

Pat
Maybe the VW Board? I'd love to have a front diff in the car... but the class I run in I can't.
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Old 01-14-2003, 08:59 AM   #4
IXLR8
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Quote:
Originally posted by Patrick Olsen
52 views and no replies? C'mon, someone has to know something about these diffs!

Pat
I know about Quaifes, but not in this (AWD) context... My track car is an ITA spec VW 16v Scirocco, with a Quaife...

Bottom line for racing FWD VW's of all sorts is that if you want to win you've pretty much gotta have a Quaife, period.

Just adding a Quaife and holding everything else constant can drop your times by whole seconds on some tracks.
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Old 01-14-2003, 11:11 AM   #5
Chris F
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We run a Quaife in the front of ConeBasher and it makes a huge difference! You are right, it does tend to pull you through the tighter corners. A note of caution though, to much power in a verytight corner will spin both fronts/and/or/all tires causing a big time push! In solo I find it makes a substantial difference in medium speed bends and transitions under power.

A lower CG, higher rate springs and more bar will also help reduce wheel spin induced understeer.

Make enough power and no diff will keep you from smoking all fours

Chris F
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Old 01-14-2003, 04:48 PM   #6
Jack
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I had a student in a pretty lowly Nissan flying at NHIS with one of these in the front. I was quite surprised to see him able to stick to the AWD line in turn 3....but he did. Having long ago campaigned an open diff CRX, I know that I had enough to keep the thing on the track without lifting or spinning like crazy.

For the AWD subie, analyze any potential problems. Hmmm, I can't think of any. You solve the hard corner under power problem in the front and....... (I'm still thinking for a "but..") uh... well, I guess it's a complete win situation. Anyone have an opposing viewpoint?

jack
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Old 01-14-2003, 05:57 PM   #7
MrAWD
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I am the one still against the front LSD and I have no plans of upgrading to it any time soon! The main reason to keep it the way it is comes through the unnecessary power that would be applied to the outside front cornering tire. That would take some of the available traction away and car would push more. The good thing is that you can compensate this with higher turning angles, but I am still not convinced that is the right way to go.

Also, if you have just an LSD (or other mechanical type diff in the center), than power would be distributed more evenly between the front and the rear, which would also cause car not to rotate as it would be with more difference between the opposite ends. DCCD (or EVOs ACD) is the great solution here with the 36/64 brake between the front and rear, which allows the car to have an extra momentum in the rear that is needed for the cars rear end rotation!

My $0.02!!


Fedja
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Old 01-15-2003, 12:08 AM   #8
Patrick Olsen
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Quote:
Originally posted by Chris F
We run a Quaife in the front of ConeBasher and it makes a huge difference! You are right, it does tend to pull you through the tighter corners. A note of caution though, to much power in a verytight corner will spin both fronts/and/or/all tires causing a big time push! In solo I find it makes a substantial difference in medium speed bends and transitions under power.

Make enough power and no diff will keep you from smoking all fours
Thanks for the info, Chris. No worries about "too much power" here - I'm N/A and intend to stay that way. I might eventually reach stock WRX power levels with some aftermarket engine management of some sort, but that's hardly earth-shaking. For now I'm in the 200-205hp range methinks.


Quote:
Originally posted by Chris F
A lower CG, higher rate springs and more bar will also help reduce wheel spin induced understeer.
Konis and Ground Controls will go on the car in the fall. I'm figuring spring rates in the 300f/250r range or something like that. I have a big rear bar, and depending on how the Koni/GC combo feels I might go with a bigger front bar, too. We shall see...

Pat
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Old 01-15-2003, 08:31 AM   #9
jmott
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Ah Chris-F! All of us should have such problems as you =)

spinning all 4 huge race tires...

the trials of 450+ hp

=)
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Old 01-16-2003, 04:08 AM   #10
Patrick Olsen
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I'd like to start taking collections now for the Olsen Upgrade-a-Diff Fund. Hopefully I'll raise the required funds so that I can do this come fall.

Pat
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Old 01-25-2003, 07:35 PM   #11
Storm
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Question

We're putting a Quaife in the rear of our 98RS and the unit didn't fit! The axle retaining clip on the gear side wouldn't allow the axle to go in. It seems that Quaife designed it for two different sized clips, and Subaru only uses one size.

After 8+hrs of dealer labor charges and numerous emails, we now have to send the unit back to Quaife, who will re-machine the groove to accept the correct clips.

Does anyone know for sure if open diff axles are the same on both sides? PN's or actual dimensions? I'd rather just ship the diff and instructions to make the grooves match, as opposed to sending the diff AND an axle while the car sits on stands for however long it's gonna take.

Sorry to hijack...it could just save you the extra $550 in labor charges to know this right off the bat.

Jay Storm
www.sourcemotorsports.com
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