LSD + Exhaust

Steve84N said:
Think what you like but you haven't tried both so...

My C63 suffered more wheelspin before the Wavetrac so it's not naturally got more traction than the Z4.

They both multiply torque so x times virtually zero friction on ice will give little back. It's still able to transfer more torque than a Quaife so when the wheel is light but not actually in the air it's more effective.
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With respect you've never tried both on an identical car running an otherwise identical setup so.....

Afraid I'm inclined to side with Guido based on the fact he appears to actually know what he's talking about from an objective rather than subjective point of view.
 
Mind you I'm not saying the wavetrac is worse. They only differ from the quaife with that wavy ring construction in combination with those fiber end plates (at the end of the helix gear to provide the extra friction in zero grip situations). Thats a construction to get more preload/friction in zero traction situations. They say that themselves.
In the video I posted you can exactly see how much traction that gives in that specific situation, and I'm not very overwhelmed by it. The car gets barely moving. Its not the holy grail.
For the rest its exactly the same as the quaife; a 1:1 copy (quaife's patent on that design has long expired, thats why you see so many competitors like wavetrac mfactory etc with the same basic design)
The thing where I think the wavetrac is more appealing is that (from what I understand in the UK at least) they have a transferrable limited lifetime guarantee and I think Quaife only gives the original owner a limited lifetime guarantee. But I dont know the exact conditions to that. How much thats worth everyone can decide for themselves.
 
I'd wager that arguing the toss on what you've read versus actually driving both is far more speculative.

At the end of the day I'm comparing two RWD cars with no electronic intervention turned on and the car with double the power gets it down better. I also drove both cars for some time with open differentials so I know what improvements they are giving.

The Wavetrac is a bit more aggressive which feels like more torque is being transferred across the axle. Here are some views of Quaife versus Wavetrac on the same car... They all agree with me that it's close but the Wavetrac is notably better.

https://www.focusst.org/forum/focus...d-slip-differential.html#/topics/21053?page=1
http://www.vxronline.co.uk/forum/showthread.php?102214-Quaife-v-wavetrac
http://www.shonutperformance.com/Wavetrac.htm
 
two of them are sponsored reviews.
I now see what you do and what you dont mean under 'speculative'.
And from the 3rd, not sponsored link:
"The wavetrac diffs have an entirely different operation to any other, and unlike other diffs they allow transfer of power even if the axle is not loaded..."
We've seen how well that works in the video I've posted. I wasnt impressed by that 'unique selling point'. It gets the car moving, but barely.
In fact I could hardly see any improvement in acceleration between 1 wheel on ice and both wheels on ice (and that improvement in acceleration is the difference the locking mechanism makes)
I wonder if it has enough zero load lockup to get you from a standing start up an overpass.


First of all you post characteristics on your former car that my car hast displayed at all, despite the 40+% power and torque advantage my car has over your previous one (so this is not 'something I've read'), plus I show a video on how effective it is in the conditions wavetrac claims to target and solve, with featuring a car that has the same rear axle/drivetrain setup as a z4.
How is that in any way speculative?
If my car doesnt display the miscomings you descibe what happened on your car (and mind you, I've had the quaife for 8(!) years, a LOT longer than you've had yours), and you claim its not the setup. Isnt that speculative?
 
I don't disagree that it's not perfect in zero load but I do agree that zero load hardly ever occurs.

The Quaife is good enough that I don't doubt you're happy with it, I liked mine too. I'm also convinced the Wavetrac is more effective at torque multiplying across the axle and until you've tried it you're just stabbing in the dark dismissing all other views based on an ice video. You won't see the benefit of the extra feature there as much because you're trying to multiply virtually bugger all, yet in reality you've got more friction to play with. I didn't buy it to drive in the snow, I got it to stop inside wheelspin at T-junctions as you go over the crest in the road where you get close to zero load and it deals with it very well whereas the Quaife would still give more slip.

At the end of the day it's a moot point as you're happy and so am I.
 
Steve84N said:
I got it to stop inside wheelspin at T-junctions as you go over the crest in the road where you get close to zero load and it deals with it very well whereas the Quaife would still give more slip.
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My car doesnt give any slip on one wheel in those situations. And thats with over 40% more power and torque than your previous car. If that isnt due to the setup of your car like you claim, your previous diff must have been faulty. There's no other explanation.
Since I've got my quaife (like I said: 8 years ago), I've never had an inner wheel spinning anymore on the road, in dry or wet conditions (I dont drive on ice). When I break traction, which is fairly easy with the twinscrew compressor, its always on both wheels. Also in cambered corners (like alpine hairpins) or on T junctions.
It works flawlessly.
 
Ed Doe said:
I have a Quaife LSD. Fitted by Birds into the existing diff housing (as with all differentials) with a lifetime warranty. In my opinion it's a must have. You can do without it for most road driving but it does make a noticeable difference. It's in a totally different league on track though. Definitely recommended depending how you drive the car.

Exhaust I believe is 50mm diameter for each pipe.
Personally I had a backbox delete on my car for all of 2 weeks - I couldn't bear it as a daily, it was ridiculously boomy between 1500-3000rpm.

I've had my mid-box deleted now and replaced with straight piped for the princely sum of £50 - makes it a bit louder but not intrusive - perfect for me with noise limits on tracks, and for daily driving,
Click to expand...

Got a video of it now? I did a backbox delete on my last 2.5si and loved it. However this time around I’ve done a backbox mod so is half way in between, and I’d like just that little bit extra.
 
Doddsy said:
Ed Doe said:
I have a Quaife LSD. Fitted by Birds into the existing diff housing (as with all differentials) with a lifetime warranty. In my opinion it's a must have. You can do without it for most road driving but it does make a noticeable difference. It's in a totally different league on track though. Definitely recommended depending how you drive the car.

Exhaust I believe is 50mm diameter for each pipe.
Personally I had a backbox delete on my car for all of 2 weeks - I couldn't bear it as a daily, it was ridiculously boomy between 1500-3000rpm.

I've had my mid-box deleted now and replaced with straight piped for the princely sum of £50 - makes it a bit louder but not intrusive - perfect for me with noise limits on tracks, and for daily driving,
Click to expand...

Got a video of it now? I did a backbox delete on my last 2.5si and loved it. However this time around I’ve done a backbox mod so is half way in between, and I’d like just that little bit extra.
Click to expand...

Sorry I'm afraid I don't - I've sold the car now :(

It was a bit louder than oem but with no boom is the best I can describe it!
 
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