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#1
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Quaife ATB Differential, a possibly good modification?
Whilst looking up information on the Ford Focus RS. I discovered some things behind its technical specs and how it makes such a great handling car with plenty of punch. From a video review I saw about it on Top Gear they talked about a special differential that gave it improved acceleration, handling and throttle response. However the trade off seemed to be some major torque steer during a daily drive up a windy road in Scotland. So when looking up information on a proof of a probable Cosworth Focus being put into production I found some technical tidbits on the Focus RS. One which caught my eye was the special differential it used is the Quaife Differential, which is actually found factory equipped in some in some cars while you for others you can order it from their in-house aftermarket supplier such as Mopar for the SRT-4. This page explains some of the technical details behind how it works and what it does.
When I looked up the list of which cars Quaife supplies diffs for, it sell both front and rear diffs for the Subaru WRX (since WRX have AWD), but interestingly enough it says it is not compatible with STis. Since the SVX is capable of using tranny parts from almost any other Subaru in their production from 1990+ (Has there been any successful transplant of the 5 speed auto?) so I figured this should work as well. One of the things that peaked my interest towards the application of thing in the SVX is the fact that this diff actively applies traction to the wheel that has stronger grip without retarding the other. In other words it would not only give the SVX more whp but also the affect of our transfer clutch AWD SVX having VTD without that traction retarded stuff. So what this means is that this might be great for your average SVX, but also even better for any SVX that has Stage II and whom somebody who has it has been typing about getting even better drag times if it is not for wheel slippage (I am not good with remember names, not even usernames ). And to longassname, perhaps this may reduce your tire spinning time for the Stage III SVX to perhaps half a second at least. Or even SVXRide's Auto-X SVX might see improvement, if this doesn't mess with SCCA rules of course . As for it having the torque steer issued that seem plague the Focus RS, I don't think there would be too much torque steer since I am talking about the AWD SVX. But you can always try it with a FWD SVX and it might not be as affected as much either since it is larger than a Focus with a larger N/A engine as well that probably has a more balanced torque curve. So what da ya think? Last edited by Weebitob; 04-23-2005 at 12:07 AM. |
#2
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Unfortunately, there are no aftermarket front LSDs for the 4eat tranny. The Quaife unit only works in the 5MT (which is why it doesn't work in the STi).
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#3
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Than I guess this would be an option for any SVXer that opted for the 5 speed tranny swap.
Not for our 4eat transmission but obviously there is one for the Pontiac Grand Prix. So there is hope just yet. The good news is at least we can put a Quaife rear diff on and this might be to give somewhat of a traction advantage, and since it is in the rear there would be still not as much direct torque steer. Is it a good idea to have a different diff in the rear than in the front for an AWD vehicle or do you think that would screw things up? Perhaps a petition or letter of a kind demand for a one compatible with a Subaru 4EAT tranny is in order. Some of us on the forum have become quite accustomed and good at persuading aftermarket parts for the SVX, and in this case it may be easier since it would be for most Subaru autos in general. Last edited by Weebitob; 04-23-2005 at 12:57 AM. |
#4
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Different diff in the rear? The car already has a LSD in back and an open diff in the front. How would the Quaife be any different?
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#5
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i'm pretty sure tq steer is more from fwd cars not rwd
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92 LS-L been sitting for 6 years. 86 fiero gt, t-tops, 3800sc, headers, intercooler, p&p blower and lower intake, 3.0 pulley, 1.6RR's, double roller timing chain, xp cam, 130lb valve springs and hooisers :P 87 starion- currently rides on jackstands. |
#6
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#7
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I believe someone said that the SVX LSD is rather weak and if this is true then it's possible the Quaife LSD would be beneficial.
I believe the LSD is weak (I've been able to spin 2 opposite tires on many occasions). If I had the time and could afford it I would change both diffs on my SVX with Quaife diffs.
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
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