Quaife (Torsen style) LSD?
Originally Posted by RickyJay52
(Post 2149428)
Please do not give any ideas, or goad, our wonderful Unhingd into yet another mod...he already has enough ideas in his head and on his plate.
https://cimg3.ibsrv.net/gimg/www.jag...a2ca1ce52c.jpg |
Are there any electronics that would be affected by such an upgrade?
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Yes my only question is with the electronics of the sport diff, how will that work? Other than that, I am in. I need this asap. How long do you think it will take them to make it? I have a 15 R.
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Will work with a base model?
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*drool*
I am very interested, but this year I am unlikely to be able to afford the expense of a custom-built differential. The last time I looked into one, it was $5,000 CAD and up. |
Will this work with the base (non factory LSD)?
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All good questions, yet to be answered. We are dealing with at least 3 different diffs. Open diff, mechanical LSD & ELSD.
1. I suspect installing a Quaife in the ELSD will throw a code that will require some type of programming if you don’t want to see the “ELSD not available” warning. 2. The 3 varieties of diffs probably have different cases, creating an additional challenge as well. 3. Final drive ratios vary, which will require some thought and even additional programming to keep the speedo accurate. Will keep you posted. Development on the short shifter took 18 months. This project will take a similar amount of time. |
Someone on this forum had installed a V6s LSD on a base and had no issues whatsoever despite the different final drive ratios. It *might* just be that you would need one version for both
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Following, i have the ELSD and its been solid thus far so im not in on the group buy, but this is interesting. Do we know the factory ratios? and is it stored in the CCF? all good info for down the road.
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Originally Posted by ss23
(Post 2149762)
Someone on this forum had installed a V6s LSD on a base and had no issues whatsoever despite the different final drive ratios. It *might* just be that you would need one version for both
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Originally Posted by Jaggyx
(Post 2149935)
If that's the case, it'd be much cheaper to simply install a used LSD.
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Originally Posted by ss23
(Post 2149762)
Someone on this forum had installed a V6s LSD on a base and had no issues whatsoever despite the different final drive ratios. It *might* just be that you would need one version for both
Originally Posted by Itismejoshy
(Post 2149862)
Following, i have the ELSD and its been solid thus far so im not in on the group buy, but this is interesting. Do we know the factory ratios? and is it stored in the CCF? all good info for down the road.
Originally Posted by SinF
(Post 2150071)
Yes, but a) they are rare, as only some V6S have them b) they are fragile, and nowhere near as robust as Torsen. Unhingd's isn't doing this just because and his V6S already has OEM LSD.
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Originally Posted by Unhingd
(Post 2150194)
Maybe Cambo has some insight as to how to recalibrate the speedometer.
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Originally Posted by Stohlen
(Post 2150207)
Most normal cars use wheel speed reference for speedo; you wouldn't have to recalibrate for a gear ratio change, only a tire size change. Do we know the F-type doesn't work this way? Or was everyone just assuming there would be an issue?
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Speedo drive is almost always off the gearbox output, I don’t think I’ve ever seen one taken from
a wheel speed sensor. Kind if she’s sense when you think about it but I’ve been wrong before (several times just today in fact. Ive used Quaife units in a few cars before now and have always been happy. They’re a racing family company, they know what they are doing. If mine was a 6-cylinder I’d be very interested. i do suspect with the electronics on the v8 models though that this is going to have drastic consequences on the stability program. I personally wouldn’t care as I think the stability software is more or less classic British black humour but it may bother some folks. I wouldn’t want codes flagged every time I drive hard either. Unhingd, if having them examine a ELSD car is helpful to the process I can volunteer mine (v8s, rwd) for them to examine as they are only a couple of hours drive from my home and I would be a potential customer as I find the latency of reaction in the ELSD distracting compared to the analog feelings I usually get from a mechanical slipper |
OK i'll give you my 2 cents...
I've fitted Quaifes to both my XKR and my XJR. Having an LSD is a million times better than a crappy open diff. But to be honest the ATB design of differential is not perfect for every occasion. Quaife makes a big deal about their diffs "never locking" but honestly sometimes a locked diff is preferable... don't get me wrong i'm a big fan of the Quaife diffs, but part of that is because there is no other option for the 4.2L cars... Anyhow, back to the F-Type... The F-Types without E-Diff are; 3.15:1 V6 non-S, 8-speed auto (open) 3.31:1 V6 non-S, 6-speed manual (open) 3.31:1 V6S, 6-speed manual & 8-speed auto RWD (LSD) The E-Diff cars; 2.56:1 (V8S, R, RWD & AWD) 3.31:1 (V6S AWD) Frankly I would forget about the E-Diff cars, because unless you have a means of editing the CCF, you have to keep the E-Diff functioning, or have a dashboard full of fault messages (can't recall if power is reduced with an E-Diff fault or not). The manual transmission cars simply do not care what the diff ratio is. Automatics have the diff ratio programmed in, and if the ratio is determined to be outside of an allowable tolerance, you get fault codes and the transmission will go into limp home mode. I don't know what the allowable tolerance is, but we suspect it's an arbitrary 10%, why 10%? If you have a 3.31, then you can put in a 3.58 and there is no problem. If you have a 3.15, and put in a 3.31, there is no problem. If you have a 3.07, and put in a 3.31, there is no problem. If you have a 2.87, and put in a 3.07, there is no problem All these have been done & tested (in F-Type, XF, XJ and XK) and the change in ratio is not more than 7.8% If you have a 2.87, and put in a 3.31, fault codes & limp mode... If you have a 2.56, and put in a 3.31, fault codes & limp mode... So something like 15% variation, is just too much. For the F-Type V6 non-S owners, going from 3.15 to 3.31 is not a problem. i.e. bolting in a V6S diff, as others have done in the past. For the F-Type V8 owners it's pretty much irrelevant, because of needing to keep the E-Diff, or finding someone to take care of the programming. The factory diffs are made by GKN Driveline in the UK, they also make the diffs in the Land Rovers. And it's ironic (to me) that GKN says that they have a helical/atb differential in their product range. But GKN has absolutely ZERO interest in aftermarket sales/support/service. You can't even buy seals or bearings from them. There are some guys in the US who have rebuild kits for the GKN diffs in the Land Rovers, but nothing for the Jags (different diffs, of course). GKN is not just an OEM to JLR, no doubt their diffs are in other makes too. But I haven't had the incentive to investigate it further, I don't have a GKN diff in my cars... Now, if you get a Quaife unit made to suit the F-Type V6... keep in mind that unit will fit in other models too, that are really in need of LSD... XK 5.0L naturally aspirated V8 (people have put the F-Type V6S diff in) XF 3.0L V6 supercharged XE 3.0L V6 supercharged Those all have open diffs, and the "same" diffs as the F-Type V6s, although not the same ratios in the XE & XF. If you need 10x units, then find some XE and XF supercharged owners to make up the numbers. As I recall there was one guy with an XF V6 supercharged who went nuts with pulleys & tunes and was going out of his mind because of no traction with the open diff...
Originally Posted by xrix4096
(Post 2150773)
...the stability software is more or less classic British black humour ....
We fixed this in our cars, the TRAC-DSC mode is altered, you still have the Stability Control functions, however it will not cut power in the event of wheelspin, if you mess up, understeer, are out of control and are going to crash, the DSC will still save you, but if you just want to put power down coming out of a corner or off the line, now you can because it will not cut power anymore. This little tweak is why my 4.2L XKR was only 4/10ths of a second slower on a 1min 20s lap around Sydney Motorsport Park than an F-Type R, the standard TRAC-DSC was holding him up all the time. |
Cambo,
Exactly the info I was looking for. Thank you! What other models might use the same differential.? I’ll go on those forums and see if I can get some folks over there to help with the 10 minimum order count. |
Originally Posted by xrix4096
(Post 2150773)
Speedo drive is almost always off the gearbox output, I don’t think I’ve ever seen one taken from
a wheel speed sensor. Kind if she’s sense when you think about it but I’ve been wrong before (several times just today in fact. |
Originally Posted by Unhingd
(Post 2150227)
Just assuming an issue. I still have this vision in my head of a cable coming off the tranny tail shaft.
In any case, I was not shopping for a diff but the Quaife is the diff of choice for my previous car and would be interested. I'm not sure how many variants there might end up for the F-Type, but I know that you have the same one I do, so know that if it fits yours it'll fit mine. You can put me on the list. If the price is generally in line with their standard offerings it seems a good opportunity. |
I'd like to revive this thread. I am very interested in a Quaife (or even retrofitted V6S LSD) for a base V6 manual.
What happened here, did it ever get ordered from Quaife? |
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