3.54:1 Powerlock Differential for a Tasmin

[wellyone]

Have any of you got a good 3.54:1 powerlock differential for a Tasmin you want to sell?. My current 4.1:1 diff is too low geared with the g/box ratios and wheels that I run.

Regards

Dave Welton

[Graham]

We used to run a powerlocker in the taz years ago and std it really fecks up the handling as its designed for a car with twice the power and twice the weight.. If you do get one it needs to be modifed to suit the car.

[sarbec]

i do have a standard diff spare & also a l s diff unit can check them out see what they are if you want

[wellyone]

Hi Ivor,

Please would you check the lsd to see what ratio it is and let me know. I have 4.01 LSD fitted now and I'm not and expert on diffs but I wonder if the crown wheel and pinion from the std (open) diff can be fitted to the LSD unit if it is the wrong ratio.

Many thanks

Dave

Edited by wellyone on Wednesday 17th September 15:41

[Dollyman1850]

Dave.
I run a 3.31 in the Griffy which is a little too tall for the car I am also going to switch to a 3.54 at some stage but I am 4sp and 6500 rev limit.

If you are going to stick to a std 4HU internal locker then the ramp angles need careful setting up. I run a Quaiff ATB in mine, Not as severe as the std plate type and allows you to get the power down in a much more controlled manner.

3.54 are getting quite hard to find because all the cobra builders want them. There used to be a Jag Breaker Between Bury and Bolton. Your looking for an early 3.6 XJS. If you want to retrofit with an ATB then you could build into a std diff and open up your options. CWP's are all interchangeable on the early 4HU BE CAREFUL though since the later jag diffs beyond mid 80's are not 4HU they are DANA and not very good.

I think you can also get a 3.7 ratio (s type) which may suit you more with a 5 speed. A 3.54 may dull the performance a little too much with a 5 speed especially if you can take the revs a little further up the range..Just found this chart which may help you via the jag breaker route. The old daimler limos were a 3.54 powerlok as well from memory.

Model Year Gear ratio Width
E Type 61-75 3.07,3.31,3.54 * 52"
Mk 10 61-75 3.54,3.77 * 60.5"
S Type 63-68 3.54,3.77 * 55"
420 66-68 3.54 55"
420G 66-70 3.54,3.77 * 60.5"
XJ6 4.2l 68-85 3.31,3.54,3.77 61"
XJ6 2.8 68-85 4.09,4.55 61"
XJ12 72-85 3.31 * 61"
XJ6/12 S3 79-92 2.88,3.07 61"
XJS 75-96 2.88,3.07,3.54 * 61"

• = Factory Posi IE powerlok

Found an address in Radcliffe.

Jaguar Breakers Ltd
Mount Sion Rd,
Bury, M26 3SJ
Tel: [phone]

N.

Edited by Dollyman1850 on Thursday 18th September 07:58

Edited by Dollyman1850 on Thursday 18th September 08:12

Edited by Dollyman1850 on Thursday 18th September 08:29

[sarbec]

wellyone said:

Hi Ivor,

Please would you check the lsd to see what ratio it is and let me know. I have 4.01 LSD fitted now and I'm not and expert on diffs but I wonder if the crown wheel and pinion from the std (open) diff can be fitted to the LSD unit if it is the wrong ratio.

Many thanks

Dave

Edited by wellyone on Wednesday 17th September 15:41

oK i WILL CHECK THEM TONIGHT

[jimtbg]

john gordon jaguar spares 01254 398476 I got all the bits for both tasmins

jim

[NTEL]

An LSD off a 4.01 will not fit a standard standard ratio. Been there done that I think I gave Jim a standard LSD when I sold the Taz to him.

Surprised you don't like the 4.01. Coupled to a close ratio T5 tuscan box Jims V6 Taz will do 135 flat out. Not sure yours will go any quicker?

[Dollyman1850]

David hasn't got the same phsyco stare and heavy right foot you have Chanty I think building a 3.77 would be a good compromise, probably a more torquey delivery less gears per lap and not so dependant upon the revs, will depend upon the circuit I guess.. Mine is lovely with a 3.31 when she gets into her stride but I am getting left out of the blocks in tighter slower corners, On the other hand its a rocket ship out of hall at Cadwell etc. Horses for courses. will be a 3.54 for me I think with the current engine and 4 speeds.

N.

[wellyone]

Thanks for the help and suggestions so far. The problem I have is that first gear is a total waste of time and even starting in second I have to feed the power in gently to avoid wheel spin. I think sprinting and hill climbing is different to racing in that, in general you only have one lap to get everything right. The car is fairly light at 1030kg and with the current gearing I'm hitting the rev limiter (6250)very quickly in gears 1 to 4, hence I have to short shift to make best use of the available torque with the 5 litre engine. At places like Harewood I have to change up/down 9 times where the other lads in the TVR Speed Championship only change gears 3 or 4 times with their longer gearing and larger wheels.I think the 3.54:1 combined with the 3 different 15" tyre diameters I have will be the best all round compromise for the different tracks I use.

So I'm still going to try and source the 3.54 LSD

Edited by wellyone on Friday 19th September 12:51

Edited by wellyone on Friday 19th September 12:56

[Graham]

which box are you using. John Sumner had a type 9 5 speed built with a much higher 1st and closer ratios on the rest which made a massive difference


IIRC that ended up as Ivors white TAz did it still have the same box then?

[wellyone]

Hi Graham,

Its a standard T5 Gearbox 2.91,1.93,1.32,1,0.82

[Graham]

wellyone said:

Hi Graham,

Its a standard T5 Gearbox 2.91,1.93,1.32,1,0.82

ah so converted to a t5, i cant remember how the type 9 options compare

[anonymous-user]

I have a 3.79 I may wish to exchange, but I'm looking for a 3.03. Diff is in very god order and set up for an 850 kilo car.

[wellyone]

I have posted this Diff topic on the wedge pages as well and a chap on there called "Bobby Shaftoe" Has offered me a 3.1 Power lock diff which may be what you are looking for

Regards

Dave

[sarbec]

Yep checked in my garage at last got a power lock 3.54 diff you can have it's out of a taz make me an offer

[wellyone]

Thanks every one, I am picking up the diff from Ivor tomorrow.

Dave