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Quaife ATB diff
- Thread starter zman240uk
- Start date
Yes indeedy
I ran a plate LSD for about 8 or so months and whilst it worked perfectly well to get me off the line, but it tended to give a little to much understeer when pushing on into tight corners, and there is a slack zone as the clutch begins to act giving a sort of false backlash wheel to wheel, yes this will be reduced with more aggressive torque settings however these traits took a little while to diagnose and understand.
I went to the Autosport show in Jan of this year and had chance to speak to the Quaife guys in detail and was very impressed by the engineering solution that they provide, including the "you wont beak it " approach
In Spring I sent them a 3.9 open R200 and they fitted the ATB unit and shimmed it correctly, taking all but the smallest amount of backlash out, whole process took about 2 weeks and all through it they were very helpful and informative (they charged an extra £80 for fitting
)
What's it like to drive
Fantastic, car is more forgiving on the handing setup, there is no noticeable transition between one wheel/two wheel drive that you tend to get on the plate LSD's (clutch action) and the tendency to push on induced understeer has all but gone. Under normal road conditions you wouldn't notice that you had anything other than a normal diff, however once the back end does move its in a very controlled and predictable manner
The diff will use any diff oil as long as it is quality, no wearing parts to replace, one setting suits all operations
Also there are no heat issues as with plate LSD's (which can get really REALLY hot)
Downsides
A little noisy with a solid diff mount (what isn't)
I have heard that in extreme circumstances such as rallying that they don't work as well due when a wheel is fully lifted, the diff still tries to apply full torque evenly and confusion reigns, however that is in extreme circumstances.
Hopefully I will be doing a magazine comparison in the near future as I managed to get some data from my accelerometer whilst doing decreasing circles in a car park (got told off by the manager of the COOP) one set using the plate LSD and a few weeks later using the Quaife ATB the results were significantly different
0.78 lateral G' with the LSD
0.98 lateral G's with the Quaiffe
Both tests were done whilst using Kumho KU15 tyres (before moving to the toyo's I have now)
There is a debatably point as to what setting the LSD was using etc but the very fact that you need to have a plate LSD set up for the type of driving/car handling is a point in favour of the Quaife where as mentioned "one setting suits all"
Interestingly enough, whilst at Bruntingthorpe this year (with J tuner) after a horrendous 9000rpm over rev (selected 2nd instead of 4th) my car developed a horrendous clunk upon take up, instinctively I thought "I have bu**ered my lovely diff up" and immediately phoned quaife who repeatedly said "you haven't broken it, other things will break first" convinced they were wrong I began taking things apart, only to find that it was the solid mount its self that had been ripped apart.....
so at 105 mph I had exposed the entire drive train to unthinkable forces...(enough to tear a solid diff mount apart) and quaife were still adamant that their diff was fine....as it happens they were indeed correct. To be that confident in your product inspires huge confidence from the end user
If you are interested Mike (MJP) has a business relationship with them
I ran a plate LSD for about 8 or so months and whilst it worked perfectly well to get me off the line, but it tended to give a little to much understeer when pushing on into tight corners, and there is a slack zone as the clutch begins to act giving a sort of false backlash wheel to wheel, yes this will be reduced with more aggressive torque settings however these traits took a little while to diagnose and understand.
I went to the Autosport show in Jan of this year and had chance to speak to the Quaife guys in detail and was very impressed by the engineering solution that they provide, including the "you wont beak it " approach
In Spring I sent them a 3.9 open R200 and they fitted the ATB unit and shimmed it correctly, taking all but the smallest amount of backlash out, whole process took about 2 weeks and all through it they were very helpful and informative (they charged an extra £80 for fitting
)What's it like to drive
Fantastic, car is more forgiving on the handing setup, there is no noticeable transition between one wheel/two wheel drive that you tend to get on the plate LSD's (clutch action) and the tendency to push on induced understeer has all but gone. Under normal road conditions you wouldn't notice that you had anything other than a normal diff, however once the back end does move its in a very controlled and predictable manner
The diff will use any diff oil as long as it is quality, no wearing parts to replace, one setting suits all operations
Also there are no heat issues as with plate LSD's (which can get really REALLY hot)
Downsides
A little noisy with a solid diff mount (what isn't)
I have heard that in extreme circumstances such as rallying that they don't work as well due when a wheel is fully lifted, the diff still tries to apply full torque evenly and confusion reigns, however that is in extreme circumstances.
Hopefully I will be doing a magazine comparison in the near future as I managed to get some data from my accelerometer whilst doing decreasing circles in a car park (got told off by the manager of the COOP) one set using the plate LSD and a few weeks later using the Quaife ATB the results were significantly different
0.78 lateral G' with the LSD
0.98 lateral G's with the Quaiffe
Both tests were done whilst using Kumho KU15 tyres (before moving to the toyo's I have now)
There is a debatably point as to what setting the LSD was using etc but the very fact that you need to have a plate LSD set up for the type of driving/car handling is a point in favour of the Quaife where as mentioned "one setting suits all"
Interestingly enough, whilst at Bruntingthorpe this year (with J tuner) after a horrendous 9000rpm over rev (selected 2nd instead of 4th) my car developed a horrendous clunk upon take up, instinctively I thought "I have bu**ered my lovely diff up" and immediately phoned quaife who repeatedly said "you haven't broken it, other things will break first" convinced they were wrong I began taking things apart, only to find that it was the solid mount its self that had been ripped apart.....
so at 105 mph I had exposed the entire drive train to unthinkable forces...(enough to tear a solid diff mount apart) and quaife were still adamant that their diff was fine....as it happens they were indeed correct. To be that confident in your product inspires huge confidence from the end user If you are interested Mike (MJP) has a business relationship with them
zman240uk
Club Member
Car is still liveried and credited to DJR (see pic). However, it does bear a striking resemblence to the BRE IMSA GTU cars, does it not...
Hence the comment in my profile, which is not an attempt to deny the builder the credit that is due.
Hence the comment in my profile, which is not an attempt to deny the builder the credit that is due.
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datsun dave
Club Member
Mr.F said:
Mike i hope you washed your mouth out with soap after that
Albrecht
Well-Known Forum User
Mr.F said:
If the component parts of said 'G-nose' were genuine ( Nissan ) factory items, then the term would be correct. Anything else - no matter how close a copy of the original parts - would be just that ( a copy ).
The big no-no is to call such a car a "ZG" or a "240ZG" ( or even a "260ZG"
) which is a factory term, and should not be used with gay abandon.