XJS V12 Manual Conversion & ITB's & Maybe TWR Rep
Discussion
This one is for the xjs wire experts I hope. I have a late xjs rear axle with the speedo transducer fitted into the diff case. Once connected to the speedo transducer interface. There are four wires. Anyone know what these connect to so I can use a series 3 xj6 electronic speedo dial? The xj6 speedo only needs two wires to work. The pulse and live
So above shows the xjs speedo drive interface. The blue connector matches the wiring from the item bolted to the diff case. So no problem there. The other connection has 4 wires. An educated guess is the green wire is the pulse signal. Then the other 3......I believe this unit also gives a signal to the cruise control and trip computer. Possibly I just need to connect the red as the power input from the speedo. I’m not sure though as I can’t seem to find a suitable wiring diagram.
If anyone could help it would be appreciated
Just to say that this dream still very much lives on
I'm enjoying the BMW M Coupe I bought instead too much to just chop that straight in, but there's got to be a way!!
Now building an extension which slows matters down again.
Has anyone any updates on XJS manual V12 projects to whet my appetite?
I'm enjoying the BMW M Coupe I bought instead too much to just chop that straight in, but there's got to be a way!!
Now building an extension which slows matters down again.
Has anyone any updates on XJS manual V12 projects to whet my appetite?
Edited by urquattroGus on Friday 4th June 20:11
urquattroGus said:
Just to say that this dream still very much lives on
I'm enjoying the BMW M Coupe I bought instead too much to just chop that straight in, but there's got to be a way!!
Now building an extension which slows matters down again.
Has anyone any updates on XJS manual V12 projects to whet my appetite?
I've got aspirations to do similar but in a mild way. I only recently bought my car and it's been dry stored but mechanically neglected for 20 years so my wife and I agreed I'd drive it in original form for one year before modifying anything. Putting some miles on now is showing up all the sorts of stupid little things you'd expect to find so I'm dealing with them as they show up.I'm enjoying the BMW M Coupe I bought instead too much to just chop that straight in, but there's got to be a way!!
Now building an extension which slows matters down again.
Has anyone any updates on XJS manual V12 projects to whet my appetite?
Edited by urquattroGus on Friday 4th June 20:11
The idea is that come manual gearbox time I am in a good position to appreciate the difference, that I've resolved most of the issues that arise from lack of use and finally that when I do start to dismantle the car for the gearbox change I don't find a million little things that greatly increase the cost at that point and extend the time to the point that I lose interest and don't get the car back together again.
The only trouble is I'm enjoying the effortlessness and quietness of the car in its current form much more than I ever imagined I would. I'm now wondering if the manual conversion and more sound is the right thing to do. I still think so overall, but I was sure it was until I actually got the car and now I've got a competing point of view in the mix.
Manual gearbox really does make the car a lot more fun. The engine's so unfussy, you can almost drive it like an auto, too.
Mine's got the Gaz suspension, lower Eibach springs and poly bushes all round, along with a fancy exhaust. It isn't wafty anymore, which is a shame - more like a big Cerbera now!
If I was doing it again, I'd definitely do the gearbox and 3.54 diff, maybe the exhaust, but leave all the rest standard.
Mine's got the Gaz suspension, lower Eibach springs and poly bushes all round, along with a fancy exhaust. It isn't wafty anymore, which is a shame - more like a big Cerbera now!
If I was doing it again, I'd definitely do the gearbox and 3.54 diff, maybe the exhaust, but leave all the rest standard.
So I'm trying to figure out this whole situation with the manual swap . I believe the UK cars use a Getrag gearbox (either 265 or 290). Here in the US, the people offering the kits use a Tremic. The problem is that he kit costs a chunk of change and from reading the forums, there have been issues with orders taking months to deliver after payment.
I'd like to explore sourcing my own gearbox and getting the rest of the stuff from the UK. I'm reading in placing that the G290 was also used in Chevy and Dodge pickups as the NV3500. If this is the case, then i expect that it would be easy to come by. Does anyone know?
I'd like to explore sourcing my own gearbox and getting the rest of the stuff from the UK. I'm reading in placing that the G290 was also used in Chevy and Dodge pickups as the NV3500. If this is the case, then i expect that it would be easy to come by. Does anyone know?
alabbasi said:
craigjm said:
Oh a 290? Find a gearbox and you have the bell housing as it’s integrated
I don't think so, unless you're using the 6L V12 which I believe has a chevy bell housing bolt pattern. The 5.3 uses a different housing and Jaguar never offered the XJ6 with a manual in the US.Nice to see I'm not the only one interested in this
Simply Performance in the UK were very helpful with manual swap stuff, worth speaking to them maybe?
I drove a manually converted car and wish I'd bought it
Dark Blue 5.3 HE with TWR bodykit and DB7 suspension and brake upgrades, drove really well.
6ltr wise there is the XJR-S or XJRS 6.0 which I think has the same bolt pattern as the 5.3, and then the later 1993/4 on 6.0 with coil pack ignition that was mated to the GM 4 speed auto box instead of the older 3 auto speed box.
Simply Performance in the UK were very helpful with manual swap stuff, worth speaking to them maybe?
I drove a manually converted car and wish I'd bought it
Dark Blue 5.3 HE with TWR bodykit and DB7 suspension and brake upgrades, drove really well.6ltr wise there is the XJR-S or XJRS 6.0 which I think has the same bolt pattern as the 5.3, and then the later 1993/4 on 6.0 with coil pack ignition that was mated to the GM 4 speed auto box instead of the older 3 auto speed box.
craigjm said:
Sorry, maybe I wasnt clear enough. You mention two gearboxes in your post, the 265 and 290. The difference between the two is that the 265 earlier box has a separate bellhousing and the later 290 has the bellhousing integrated into the body. Regardless of what gearbox you find you will need an adaptor for the bolt pattern which is why the likes of Johns Cars and others exist. If you want a reliable supplier for all the parts for your conversion, whilst maybe sourcing the actual box closer to home to save transport costs, speak to Simply Performance in the UK as they have done this many times over.
Craig, thanks. I'm somewhat familiar with the 265 as I have a few BMW's. Those are getting hard to find here. If the 290 and the NV3500 are actually identical. It should be easy to source.craigjm said:
alabbasi said:
craigjm said:
Oh a 290? Find a gearbox and you have the bell housing as it’s integrated
I don't think so, unless you're using the 6L V12 which I believe has a chevy bell housing bolt pattern. The 5.3 uses a different housing and Jaguar never offered the XJ6 with a manual in the US.Gus, thanks dude, no I don't have a rebuild thread, I'm very good though at hijacking everyone else's .
I've used the 265 getrag from the XJS, its a tried and tested modification from Simply performance. It comes with the adaptor plate.
Yes ROB the adaptor plate does move the coupling of the box along the spline by half an inch or so, but according to a number of jaguar racers and experts it matters not...
Gus I may add a thread here just to post the shots I posted on everyone else's thread...
I've used the 265 getrag from the XJS, its a tried and tested modification from Simply performance. It comes with the adaptor plate.
Yes ROB the adaptor plate does move the coupling of the box along the spline by half an inch or so, but according to a number of jaguar racers and experts it matters not...
Gus I may add a thread here just to post the shots I posted on everyone else's thread...
Edited by V12 Migaloo on Thursday 10th June 09:19
urquattroGus said:
V12 Migaloo said:
urquattroGus, not XJS but certainly XJ, have all my parts now... just waiting to have it all fitted... soon.. 
Wow, lovely! do you have a build thread anywhere?Is that an S3 XJ12 Saloon? What sort of gearbox are you going for?
I love an XJ too, another temptation!
will sort a separate build thread in due course
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