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Old 03-11-2013, 04:12 PM   #1
Android287
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Default Quaife Front lsd looking for feedback

Is anyone out there rocking the Quaifle front diff? Just want to hear some feedback. I'm Condering this diff or the subaru helical as well if Japan has it instock. My transmission will already be out so now is the time.
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Old 03-11-2013, 10:52 PM   #2
Storm
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I ran it for several years. It's a great addition to the system. I didn't like it on snow or mud, but for tarmac use, it's awesome.

FWIW, I also gambled on an OBX helical front diff and it feels exactly the same....... My Quaife has moved on to a new owner and I still flog the ever loving crap out of this OBX. It just won't break.


Jay
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Old 03-11-2013, 11:26 PM   #3
Uncle Scotty
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Jay, what didnt you like about the Quaife diff for mud/snow and what would you think would be better???


im considering having a 5mt built with better gears and diffs and would like your input for somebody who would use it as an all around drive it anywhere/anywhen thing.....im thinking that 350-400ish whtq
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Old 03-12-2013, 10:15 AM   #4
FlatironsTuning.com
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Just guessing, but helical diff's will act as open diff's if one wheel has no traction. So if you drive a lot in very slick or low grip solutions, a clutch type LSD would offer more grip in those conditions. However, IMO they do not work well on the street or in high grip conditions.

I have been using a Modena front TBD for a couple years now and love it on the track. And I think it does fine in the snow (just drove in this morning in about 1" of slush as a matter of fact...) And it would be very similar the the Quaife FWIW.

One other thing to consider as you are looking at a higher Hp build is that if you have enough power to break the front inside wheel lose in a corner, then the TBD may not be ideal as again in that situation, the helical diff will act as an open diff.. At about 400 whp you are going to be on the fringe of where you might need the front LSD. But if you are using big sticky tires, you may be fine with the TBD.

Also FWIW, if you do decide to run a front LSD, you will have to change your driving style a bit, as that will tend to make the car understeer if you don't change your input to compensate.

Good luck with your build.
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Old 03-13-2013, 12:01 AM   #5
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I didn't like the hunting feeling through the steering wheel on ice and low-low grip situations. It wasn't just the Quaife that exibited this, the OBX diff does it too. As mentioned above, Very slick conditions or wheel in the air situations allow a helical diff to act as an open diff. On tarmac though, when you turn into the corner and apply power again, the front end pulls for the apex, instead of pushing out. You are able to get on the throttle much sooner, and increase your exit speed substantially.

For your power levels, you'd still be fine with the Quaife. It's made from very good materials. You will want to take advantage of the rear grip though, as that much power will likely spin both front wheels exiting low speed corners. A DCCD will exponentially transform the car and tie the front and rear diff setup together beautifully.

Jay
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Old 03-13-2013, 04:43 AM   #6
Android287
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During daily spirited driving when the torque hits during a turn, I get some wheels spin from the outside wheel. Will this helical diff help to prevent this at all then?
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Old 03-13-2013, 10:41 AM   #7
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Quote:
Originally Posted by Android287 View Post
During daily spirited driving when the torque hits during a turn, I get some wheels spin from the outside wheel. Will this helical diff help to prevent this at all then?
It is actually your inside wheel, and yes, the front helical diff will prevent this up to the point where you are completely overpowering the front inside tire again.

As Jay said, the helical front diff will allow you to apply power sooner in a corner, and the car will hold the line set by your steering input up to the limit of traction.

It is truly a great addition to any 5MT as it makes the car feel much more planted in a corner.
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Old 03-14-2013, 10:33 AM   #8
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Does so one have the correct part number they used? I contacted Quaife and they told me that QDH3Y is the one i want, but everywhere i look it says that this is for the six speed.

Thanks
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Old 03-14-2013, 09:31 PM   #9
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Tell them you need one for a 5MT. Specifically, this one..... QDH1Y

Jay

Last edited by Storm; 03-14-2013 at 10:19 PM. Reason: Part number correction
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Old 03-14-2013, 09:52 PM   #10
JarHarms
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I can confirm that QDH3Y is certainly the 6MT version.
http://i24.photobucket.com/albums/c2...T/IMAG1080.jpg
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Old 03-16-2013, 06:33 AM   #11
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Quote:
Originally Posted by FlatironsTuning.com View Post
Just guessing, but helical diff's will act as open diff's if one wheel has no traction. So if you drive a lot in very slick or low grip solutions, a clutch type LSD would offer more grip in those conditions. However, IMO they do not work well on the street or in high grip conditions.

I have been using a Modena front TBD for a couple years now and love it on the track. And I think it does fine in the snow (just drove in this morning in about 1" of slush as a matter of fact...) And it would be very similar the the Quaife FWIW.

One other thing to consider as you are looking at a higher Hp build is that if you have enough power to break the front inside wheel lose in a corner, then the TBD may not be ideal as again in that situation, the helical diff will act as an open diff.. At about 400 whp you are going to be on the fringe of where you might need the front LSD. But if you are using big sticky tires, you may be fine with the TBD.

Also FWIW, if you do decide to run a front LSD, you will have to change your driving style a bit, as that will tend to make the car understeer if you don't change your input to compensate.

Good luck with your build.
Quote:
Originally Posted by Storm View Post
I didn't like the hunting feeling through the steering wheel on ice and low-low grip situations. It wasn't just the Quaife that exibited this, the OBX diff does it too. As mentioned above, Very slick conditions or wheel in the air situations allow a helical diff to act as an open diff. On tarmac though, when you turn into the corner and apply power again, the front end pulls for the apex, instead of pushing out. You are able to get on the throttle much sooner, and increase your exit speed substantially.

For your power levels, you'd still be fine with the Quaife. It's made from very good materials. You will want to take advantage of the rear grip though, as that much power will likely spin both front wheels exiting low speed corners. A DCCD will exponentially transform the car and tie the front and rear diff setup together beautifully.

Jay

thank you both for your input on this......i do appreciate it
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Old 03-16-2013, 08:44 PM   #12
RoidRage
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Quote:
Originally Posted by Uncle Scotty View Post
Jay, what didnt you like about the Quaife diff for mud/snow and what would you think would be better???


im considering having a 5mt built with better gears and diffs and would like your input for somebody who would use it as an all around drive it anywhere/anywhen thing.....im thinking that 350-400ish whtq

Yeah I've had the Quaife unit recommended to me a number of times for the front on a 5 speed build, and a 1.5 clutch type seems to be the way to go for the rear. But the center, what to do about the center!?!

Did you have any plans?
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Old 03-16-2013, 11:17 PM   #13
Storm
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I've used the Cusco Tarmac center diff to alter the bias % F/R from 50/50 to 65/35. It was nice, and on a roadcourse, would be close to ideal. For my needs, it showed a weakness in the lack of limiting wheelspin. If the rear wheels broke loose, they would continue to spin until I pedalled the throttle and costing time. In the wet it was worse for times, but stupid fun.

I've since installed a spec-UK DCCD unit paired with a DCCDPro controller. The maps programmed into the controller exceeded my expectations in every way. That would be my reccomendation to anyone wanting to maximize the AWD platform.

Jay
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Old 03-17-2013, 12:39 AM   #14
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^^ May I ask how you acquired the dccd unit? Ive been looking for a supplier that can get a hold of them fairly reliably. Or some sort of rebuild kit solution.

The cusco tarmac is intresting (though I think it was discontinued), Ive also been eying the ppg torsen unit, but I think the dccd + a good controller would be ideal.
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Old 03-17-2013, 12:14 PM   #15
Storm
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I found it used on scoobynet.uk. Every now and then, they come up FS over there. I recently saw one come up here stateside for a very reasonable price. I'm kicking myself hard for not snapping it up as a spare.

I do not have any direct experience with the PPG torsen unit. The DCCD is the ideal solution in my humble opinion.


Jay
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Old 03-17-2013, 06:18 PM   #16
RoidRage
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Thanks, I appreciate it!
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Old 03-18-2013, 10:25 AM   #17
gsrcrxsi
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Quote:
Originally Posted by FlatironsTuning.com View Post
a clutch type LSD would offer more grip in those conditions. However, IMO they do not work well on the street or in high grip conditions.
curious about this statement. i agree that a clutch type will be a nuisance on the street. ive driven cars with pretty aggressive clutch diffs on the street and low speed turning is brutal. lots of popping and clunking.

but i would disagree that they do not work well in high grip conditions. they are preferred to gear types in tarmac/road course racing. they perform better than the gear types in these racing types. they also will wear out a lot faster than a gear type though, and will need rebuilds.

just my .02
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Old 05-25-2013, 11:40 AM   #18
tmoretta
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Default front LSD diff.

Does anyone know if the Tomioka brand torsen type LSD for WRX front differential ia any better/more robust than the OBX? Guys say that you must modify the OBX to correct factory defects.
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Old 05-25-2013, 10:34 PM   #19
Storm
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Never heard of that particular diff......I did nothing to my OBX besides disassembling to have a look. To say you MUST change the hardware is incorrect.

Jay
Quote:
Originally Posted by tmoretta View Post
Does anyone know if the Tomioka brand torsen type LSD for WRX front differential ia any better/more robust than the OBX? Guys say that you must modify the OBX to correct factory defects.
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Old 05-26-2013, 01:59 AM   #20
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Tomikoa is a similar enough brand to OBX that they're probably the same product in a different box. I think the kit was only like $30 shipped, it's not like it was going to break the bank, so I did it just for peace of mind.

The OBX screws I had were already stamped with 12.9, but one had a really tough time in the threads. Not sure why. I cleaned out the hole and the retro kit screw went in fine. I installed the retro kit bolts just because they'd all be the same. The belleville washers who knows, but I used the retro kit ones.
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