Rear differential on S2
Discussion
Anyone have any ideas about the differential on the S2? I want to run a 'torque biasing diff' as opposed to an LSD as they do not require much maintenance or setting up. I have heard that the rear axle assembly is from a Sierra 2.3 diesel estate, but can't confirm and I can't imagine TVR would have a diff especially made to couple to Ford running gear when so many 'off the shelf' possibilities existed when the car was built.
I have a sneaking suspicion that the standard S2 diff is Sierra 7" which would be nice, as Quaife do a direct replacemant Torque Biaser, for half the price that TVR are asking!
Can anyone confirm this or has anyone done this conversion?
I have a sneaking suspicion that the standard S2 diff is Sierra 7" which would be nice, as Quaife do a direct replacemant Torque Biaser, for half the price that TVR are asking!
Can anyone confirm this or has anyone done this conversion?
quote:
Anyone have any ideas about the differential on the S2? I want to run a 'torque biasing diff' as opposed to an LSD as they do not require much maintenance or setting up. I have heard that the rear axle assembly is from a Sierra 2.3 diesel estate, but can't confirm and I can't imagine TVR would have a diff especially made to couple to Ford running gear when so many 'off the shelf' possibilities existed when the car was built.
I have a sneaking suspicion that the standard S2 diff is Sierra 7" which would be nice, as Quaife do a direct replacemant Torque Biaser, for half the price that TVR are asking!
Can anyone confirm this or has anyone done this conversion?
Yes it is a standard Ford 7" diff. Have you driven a Quaiffe/Torsen diff before? I was thinking about one of these for the V8S at one point, I was put off by the feedback I got from others who had tried them. Apparently they give quite different characteristics to conventional friction type diffs and take some getting used to. In the end Quaiffe couldn't do one to take the power in that casing so it was academic, so I ended up with the current R&D version made from Unobtainium/Kryptonite alloy.
Cheers,
Peter Humphries (and a green V8S)
Peter, Paceracing is Jason Watkins with the red S2 in case you were wondering. It's good to know you are still 'mixing it' with that V8S of yours! How is it going? The last time I spoke to you was early last year I think, when you were looking into suspension and roll bar rates. How is the V8S, have you developed it much further since then?
Thanks for the differential advice, I have driven Graham Richardson's 235BHP SBD Westfield in anger at Lydden and that runs a torque biasing diff as opposed to LSD and it drove quite well. I don't know what the affect would be on the 'S', but I suspect it to be similar. Reading Dave Walker in CCC, he seems to favour ATB's to LSD's as well, since aftermarket LSD's usually need to be set up specifically for the car/driver.
Thanks for the differential advice, I have driven Graham Richardson's 235BHP SBD Westfield in anger at Lydden and that runs a torque biasing diff as opposed to LSD and it drove quite well. I don't know what the affect would be on the 'S', but I suspect it to be similar. Reading Dave Walker in CCC, he seems to favour ATB's to LSD's as well, since aftermarket LSD's usually need to be set up specifically for the car/driver.
quote:
Peter, Paceracing is Jason Watkins with the red S2 in case you were wondering. It's good to know you are still 'mixing it' with that V8S of yours! How is it going?
Well hey there stranger! Still stock hatching? Yes the suspension has been drastically modified since you saw it. Gone to 600/400 with some fine tuning plus geometry and arb mods to counter the oversteer, now takes a very generous right foot in third to keep it neutral instead of feathering the throttle out of every corner. Not quite as much fun in the dry (still hoolies nicely in the rain
) but astounding traction out of the corners to match the awesome brakes on the way in. Totally transformed the car, easy two seconds a lap quicker at most places with far less drama than before. Very nearly got into the 95s standing lap at Goodwood, missed by six hundredths, this is roughly ten seconds quicker than the class win three or four years ago. Can you tell I like this? Unfortunately the only rubber between me and the road is the tyre so the ride quality has suffered but it is still acceptable (to me) for 25 k /year mostly A roads.
Wish somebody had made me do this years ago as it has made so much difference to the car. In fact there is so much traction it makes the car feel positively underpowered again.
Must do something about that as soon as I've finished paying for the latest round of transmission repairs, Hmmm! Cheers,
Peter Humphries (and a green V8S)
Peter, is that 600 front 400 rear? Mine runs 700 front 500 rear from memory. I could do with going softer on the front as I get a little bit of understeer on fast corners. I noticed it at Castle Coombe last year and haven't got round to fine tuning it.
Goodwood sounds like fun, I haven't been there with the TVR since I had the suspension done, so I don't know what it'll do. I was there last week testing the Fiesta getting ready for this season and nearly managed 99 secs! My FTD was 100.092 secs for a flying lap. Not bad for a standard XR2 engine! (that did involve taking 'No-Name', the right hander going into St Mary's at 120 MPH on the apex which was a laugh!)
The TVR doesn't handle quite as good as the XR2 but the power advantage should compensate somewhat. I recon the S2 could do a '98' 'round there though, which should fit with your '95' considering you have 'The Power' and we both drive like hooligans!
Jas.
Goodwood sounds like fun, I haven't been there with the TVR since I had the suspension done, so I don't know what it'll do. I was there last week testing the Fiesta getting ready for this season and nearly managed 99 secs! My FTD was 100.092 secs for a flying lap. Not bad for a standard XR2 engine! (that did involve taking 'No-Name', the right hander going into St Mary's at 120 MPH on the apex which was a laugh!)
The TVR doesn't handle quite as good as the XR2 but the power advantage should compensate somewhat. I recon the S2 could do a '98' 'round there though, which should fit with your '95' considering you have 'The Power' and we both drive like hooligans!
Jas.
Oops, sorry, forgot that others read this!
We were on about spring rates front and rear 400/600 refers to Lb Sq inch compression, so a 400Lb spring is the pressure required to compress a spring by 1 inch!
If memory serves me correctly the standard chocolate springs on my S2 were 200Lb rear 150Lb front, so it goes without saying that handling has improved somewhat!
We were on about spring rates front and rear 400/600 refers to Lb Sq inch compression, so a 400Lb spring is the pressure required to compress a spring by 1 inch!
If memory serves me correctly the standard chocolate springs on my S2 were 200Lb rear 150Lb front, so it goes without saying that handling has improved somewhat!
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Peter, is that 600 front 400 rear? Mine runs 700 front 500 rear from memory. I could do with going softer on the front as I get a little bit of understeer on fast corners.
Yes 600 front. Started with 500/400 which gave almost identical balance to the original (i.e. LOADS of power on oversteer in third and fourth!) so the spring calcs must have been about right. The arb mods helped a little but going to 600 on the front made more difference, high speed understeer unless the right foot is firmly planted, so I get plenty of drive out of corners. Understeer at lower speeds but I've got enough torque to cure that!
Been playing with the geometry too but probably not as wild as yours, after all it does a high road mileage too!
Cheers,
Peter Humphries (and a green V8S)
Peter or anyone else who can help,
I've had the offer of a 2 wheel drive Cossie diff for silly money but we think it is an LSD unfortunately (Oh well, beggars can't be choosers).
I understand that Cossie diffs use a larger crownwheel, something like 8.25" or 8.75" as opposed to the standard 7". I guess that this wouldn't fit in the standard 7" diff casing although I haven't seen it yet. Did you look at this alternative when you did yours? If so, did you look into the possibility of changing the entire diff and casing, and would it fit in your opinion?
Jas.
I've had the offer of a 2 wheel drive Cossie diff for silly money but we think it is an LSD unfortunately (Oh well, beggars can't be choosers).
I understand that Cossie diffs use a larger crownwheel, something like 8.25" or 8.75" as opposed to the standard 7". I guess that this wouldn't fit in the standard 7" diff casing although I haven't seen it yet. Did you look at this alternative when you did yours? If so, did you look into the possibility of changing the entire diff and casing, and would it fit in your opinion?
Jas.
quote:
Peter or anyone else who can help,
I've had the offer of a 2 wheel drive Cossie diff for silly money but we think it is an LSD unfortunately (Oh well, beggars can't be choosers).
I understand that Cossie diffs use a larger crownwheel, something like 8.25" or 8.75" as opposed to the standard 7". I guess that this wouldn't fit in the standard 7" diff casing although I haven't seen it yet. Did you look at this alternative when you did yours? If so, did you look into the possibility of changing the entire diff and casing, and would it fit in your opinion?
Jas.
Didn't look into it, not an option for me as I have to retain the original type casting to be elligible to sprint in the production categories.
Cheers,
Peter Humphries (and a green V8S)
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