Quaife now installed... with LSD-flavour pix
- Thread starter PerryGunn
- Start date
By the seaside...
The Quaife is a gear-based torque sensing diff - pretty much the same as your MFactory one - no maintenance required and a lifetime guaranteeMachine monkey said:What type of LSD is the Quaife? It looks great love the insides of engines gearboxes and diffs
Are they re-using the bearing from the old diff?? I did mine where tip top and i couldn't get new ones. Just interested how they get top bearing off (as you look at your picture) I had to put mine on a lathe and machine the diff housing to get a set of pullers on it!!
I've just been inspecting the underside and bushings with the mechanic - all tip top and no need to replace anything
When I took the photo of the dismantled OEM diff, I mentioned your 'fun' removing the bearing - got a couple of smiles - then, while inspecting the underside, I asked him how they remove the diff bearing and it appears that there's a 'special puller' for the job that makes life much easier
Its nice to know its fitted and you can leave it!! Life time guarantees are not that common either are they!!
Mine where perfect as well
I am sure they have made a tool or brought a special puller. There is no room at all for a normal type of tool. I just happen to have a lathe and it was a s quick. In fact quicker and cheaper to machine it.
Looks great keep us all posted
Mine where perfect as well
I am sure they have made a tool or brought a special puller. There is no room at all for a normal type of tool. I just happen to have a lathe and it was a s quick. In fact quicker and cheaper to machine it.
Looks great keep us all posted
srhutch said:I did a double-take when I first noticed the plate - I thought another b*gger had cloned yours... :lol:PerryGunn said:Even found a new DD for Steve - he won't even have to change the plate :lol:
I could live with that as my DD. Plate only one character different to mine.
It started off as an 840i but it's been worked on - amongst other enhancements, it's been supercharged :evil:
About 4 1/2 hours - including the gearbox oil change - guess you get pretty quick if you do lots of them and have all the tools in place...hopz121 said:They did that pretty fast
... that said, the guy doing it did say that there were no 'issues' so I guess that they're not all that easy
Good stuff Perry when do you get to drive her??? We want a full review!!
I've just driven her 65 miles to get home - it was a reasonable comparison as I took the same route this morning just did it in reverse to get homeMachine monkey said:
Birds is very close to the M4\M25 junction so, after getting out of Iver, the first 25-or-so miles were motorway, which was good as Quaife say that you should take things easy for the first 10 miles - I guess this is to ensure that everything is well lubricated - but there were no audible indications that an LSD had been fitted, no whines, clunks or clonks, it was perfectly behaved in town and with, brisk, straight-line acceleration up to motorway speeds and during motorway cruising it was all but invisible - I did dive into Cobham services though, and straight back out again, just so I could try the fast curves that Cobham has on the entrance/exit roads :lol:
Once off the motorway, DTC was selected (I didn't want to go balls-deep and turn everything off immediately) as the rest of the journey home was a combination of twisty B-roads and fast A-roads with lots of roundabouts. The car felt different, but in a good way, it seemed much more eager to turn into bends and didn't need quite as much steering input, the tighter the bend the more it tucked itself in. The twisties were definitely more fun and when the A-road roundabouts were empty allowing a fast entry, and faster exit, I could feel the extra traction 8)
I don't know if it's real or I'm just looking for things but on some of the crap roads with a badly broken up top layer, the car just felt better. I wondered if wheels spin small amounts as they get a bit of 'air' while going over sections of broken tarmac and the LSD is compensating for this? Anyone?
As it's been a nice, dry, Spring day, there weren't really any damp/greasy surfaces which I think would have created a bigger contrast but, overall, I'm very pleased,
All-in-all, I don't think I'll be swapping back to an open diff....
Exactly what i found with turn in. I am very please you like it and think its worth the cash.
PerryGunn said:
Ironically, with a torsen diff (like your quaife) as opposed to a clutch pack type (like Mdiff) the only major relative disadvantage is in the scenario you describe where one wheel looses grip completely (i.e. in the air, or on ice). When 0 torque is sensed on one of the axles the diff is unable to lock and you will get no drive at all.
Other than that I'm sure you'll enjoy the many benefits of the diff
That 840 looks lush. Might have to get a second car...
Stevo
Stevo
Yes, I understand that about torsen diffs but, in those situations, they behave just like a standard open diff - which should mean the car would feel the same as with an open diff, but it didn't seem to, it felt 'better' and less skittish.TomK said:
Perhaps I'll be able to explain it better once I've driven over some more roads with bad tarmac
as an aside, apparantly the newer Quaife diffs only need a very small amount of resistance to start to bias the torque and shouldn't act like an open diff on ice unless you get a film of water between the rubber and the ice - a wheel up in the air is a different matter but I try not to drive over kerbs and don't intend to take #320 off-roading :lol:
TomK said:
Actually that is often said, but not quite true in many cases (maybe prejudgemental theoretical deduction?). If you look at a diff like wavetrack they have a cone system that prevents 0 load. That is how they say 'their diff' is different.
But here comes the funny bit. Quaife diffs have 6 belleville washers inside (not many people know this.. and quaife is not unique in this type of build), creating a pretention on the sun gears (sun gearcogs pushing against the the planetary gear cogs).
So they have system inside that always locks the gears to a certain extend.
This is one of quaife's patents (over 30 years old....) that adresses this type of build (they have more variations on this in different patents):https://www.google.com/patents/EP0130806B1?cl=en
I never had any problems with lockup on potholes etc. One of the reasons I installed the quaife was even for that reason. 1 road I drive often has a lot of manhole covers (those iron lids for sewage and seperated rain drainage), every 30M or so 2 of those :thumbsdown: , and I didn't like the way the normal diff was skidding on the bumps etc. I did my homework and the quaife solved all beyond my expectations. People think I'm crazy and think I did this mod because of manhole covers in the road, but they miss the point :wink:
Maybe it's wise to practice on a wide piece of tarmac when it's moist, to get the feel.PerryGunn said:
With dtc off, the way an lsd reacts is very different than with a normal diff. Normally the inner wheel will start to spin and the car is in basis understeered. With dtc off and lsd, when cornering, you'll have more grip, but there is a point that it locks and oversteers. (with dtc on you probably wont reach this point). You have to get a feel for this and expecience spinning etc.(and that you don't want to expenience this on a normal road
)The LSD doesn't make it a safer car, but a better/faster car. So keep that in mind when switching off dtc.
edit
You beat me to it, your feel/experience on the roadholding of the car is correct. The quaife doesnt act like an open diff.PerryGunn said:
There is maybe less lockup than with full grip, but less lockup is still lockup and that creates more friction=more lockup.
There is a preload so to say (in most atb style lsd's from high quality manufacturers. quaife has it, but also brands like obx etc).
My thoughts exactly - which is why I didn't turn everything off... When I was younger I might have said 'sod it! Let's give it a go', but I'm an old(er) fart now and much more sensible (some of the time, anyway :lol: ) - which is probably why young drivers have so much trouble getting insured on powerful carsGuidoK said:...You have to get a feel for this and expecience spinning etc.(and that you don't want to expenience this on a normal road
The LSD doesn't make it a safer car, but a better/faster car. So keep that in mind when switching off dtc.
So then .. if I get this diff fitted to my e89 35is (as they do one for my car)
Am I correct in assuming I would have a better diff then a z4m has as standard :innocent:
So the little S badge becomes one step closer to a M car
... same engine as the 1m and factory fitted M badges
... so naughty
Am I correct in assuming I would have a better diff then a z4m has as standard :innocent:
So the little S badge becomes one step closer to a M car
... same engine as the 1m and factory fitted M badges... so naughty
