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Kaaz Diff?!?!?!

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Old 23-08-2013, 08:50 PM
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Pardeep
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Default Kaaz Diff?!?!?!
Anyone running this in their Focus RS MK1?

As i'm currently sorting a Fast Road/Track Car, whats this diff like on the road?

I've heard it's better than the ATB, doesn't torque steer viciously and is a nice drive. However, I would like to hear opinions from people running them.

Much Appreciated!

Cheers
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Old 23-08-2013, 09:37 PM
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we run a gripper in our mtx75, its really good.
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Old 23-08-2013, 09:41 PM
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Originally Posted by nevsrevs
we run a gripper in our mtx75, its really good.
How much better is it on the road?

As i'm aiming for 360/380bhp, I know on the standard ATB has its limits and can be darn right terrifying on the road as the diff become very unpredictable.
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Old 23-08-2013, 10:00 PM
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not sure about road really as only done about 10 miles off the track, but compared to my old atb its night and day, plus you can change ramp angles to suit your needs.
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Old 23-08-2013, 10:46 PM
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Kazz is a plated diff afaik, personally I would use a Gripper unit
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Old 23-08-2013, 10:48 PM
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I had a kazz in my skyline it was brilliant I would use the gripper but in a fwd they can be very snatchy
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Old 23-08-2013, 10:53 PM
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The kazz will be no different, its just that the gripper unit is uk built so easier for servicing etc.

Ive driven a lot of rwd stuff with 2 way plated diffs and really good to use, just in some cases a little noisy
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Old 23-08-2013, 11:21 PM
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If you read the Focus MK1 RS development info thread I posted on here, it mentions that It's more the suspension geometry that makes them torque steer rather than the diff alone. I've used Quaife ATB (and Peloquin, the US copy) in 200 ish hp Golfs and they don't suffer the same torque steer.

FRS mk1 development info thread :

https://passionford.com/forum/genera...info-pics.html
Last edited by GVK.; 23-08-2013 at 11:40 PM.
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Old 24-08-2013, 07:22 AM
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Originally Posted by JonnyBravo
Kazz is a plated diff afaik, personally I would use a Gripper unit

Both are plate diff's,

John
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Old 24-08-2013, 07:45 AM
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Originally Posted by johnny99
Both are plate diff's,

John
I know
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Old 24-08-2013, 07:49 AM
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just speak to gripper good lads, they make batches of 10. so some time your lucky some time yougot to wait.
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Old 24-08-2013, 08:54 AM
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i didn't have twitching issues with my atb in my old mtx75 box, and i reckoned on over 400bhp with 2BAR through the gt3071r.
kaaz will just be better for straight line, not as forgiving in the corners though.
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Old 24-08-2013, 09:33 AM
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I have two boxes for my new engine one has the atb the other has a kaaz ,not drove on the kaaz yet tho
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Old 25-08-2013, 10:47 AM
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Well, after reading the development thread, I'll get the geometry set up correctly and see what happens. Would prefer to keep the ATB diff.

Thanks lads!
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Old 25-08-2013, 11:53 AM
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Plated diff on a FWD road car is horrible..
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Old 25-08-2013, 01:52 PM
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It's not a case of simply setting up the geometry, it's a design fault from widening the track on FRS from stock Focus.

Originally Posted by AER

As the (non-Ford) guy responsible for the RS calibration, the guy who developed the boost controller rework for the EEC and personally did all the boost control calibration, let me say again, the press cars were very close to standard production in this regard. I say 'very close' because from my feeble memory, I think we were still fine tuning the 1st and 2nd gear boost limiter so there may have been some very subtle changes on the final production calibration. I can't be 100% sure. The torque steer problem was, as far as I heard from people who likely weren't being very charitable about it, a geometry stuff up when the track was widened from the standard C170. The guy doing the design apparently held the scrub radius fixed, instead of the king pin offset. I'm not a chassis guy myself, but the kinematics of such a suggestion makes sense, although I'm sure there's always a compromise to be reached in all of this.
(c170 is Ford's internal code for mk1 Focus)
Last edited by GVK.; 25-08-2013 at 01:54 PM.
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Old 25-08-2013, 03:42 PM
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Originally Posted by Rick
Plated diff on a FWD road car is horrible..
bit of a sweeping statement, I have owned and driven and still use a fwd with a plated diff, and they are great, better than my old atb in fact.
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Old 25-08-2013, 04:24 PM
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Originally Posted by GVK.
It's not a case of simply setting up the geometry, it's a design fault from widening the track on FRS from stock Focus.



(c170 is Ford's internal code for mk1 Focus)
I have asked a few owners and the best way to lower the torque steer through the steering is to have the car 4 wheel aligned. Most cars that left the factory were not aligned correctly due to the track being widened. Which is why the torque steer effected some and not all. Some cars were as bad as 12mm out.

So will have everything setup correctly and see how I get on. Can't be too bad if others have set their ones up this way.
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