XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

A new cat in house, but what to do with it...???

Old Apr 7, 2020 | 09:53 AM
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Default A new cat in house, but what to do with it...???

Hello all, this is Andrew from Jaguar Specialties. I hope you are all well and please please do everything you can to stay that way. We're in the 4th week of a "Shelter in Place" order in California and it looks like it will be that way for a while longer. As fate would have it, a new car came into the mix right before the you know what hit the fan, so that was great timing. I meant to post this a while back (mid-Feb) but here it is. Maybe a fun read.....

So there’s a new cat hanging around our shop, and the story about how it got here is one of odd luck. The car itself is very unusual- it’s a 1987 XJSC, a somewhat rare “almost-convertible” version of the XJS coupe that featured very unique removable pair of T-tops and removable rear roof section. This model was built in the Jaguar factory in limited numbers from 1986-1988, starting with a coupe shell that was modified to this configuration. With only some 5500 made (out of 120,000 total XJS production), this was Jaguar’s answer for open-air motoring before they offered the XJS with a traditional folding top. I’ve always liked the XJSC, called the “Cabriolet” and I’ve owned a 1988 model since 2003, bought from the original owner. That car has been the subject of many conversion projects and upgrades over the years. Anyway, one Saturday evening recently I was doing what every red-blooded American does - that’s right, cruising through Craigs List looking for interesting cars. There was the usual junk, also some nice cars, and then right there in the Jaguar section was an XJSC- something that doesn’t pop up that often. Turns out it was a Lien Sale, offered by a local tow company after being removed from a local apartment complex parking lot. It was never claimed by the owner, so put up for sale.

Of course I had to go see it and in this case it was one of those 1 out of 10 used cars that was actually better in person than it appeared in the pics. It had a good body, decent paint, nice interior, only some 80,000 or so miles, and the optional rear hardtop with glass window. Some work was going on under the hood as there were 12 brand new, never used, fuel injectors (likely to the tune of some $80+ ea x 12 = $1000, ouch) loosely attached to the injection rail. As you can expect, I did what every red blooded American does after seeing a sharp classic car for sale that he doesn’t really need- I bought it. It became pretty obvious this one wasn't going back on the road with V12 power- it had been sitting idle since 2003 so not a good prospect for resurrection there. A few days later the injectors were on their way to a Jag owner in Indianapolis, the V12 engine and trans came out and went to a local British car nut, the catalytic converters went to the recycler, and we now had a nice car with a big hole under the hood…..

There is plenty to do before it’s ready for anything – the brake system needs a full rebuild, the fuel tank is a nice example of what nasty things happen when gas and water hang out together undisturbed for 10+ years, and of course most of the suspension bushings are falling apart. But all of those bits are easily available, all for the most part the same as regular XJS parts. And for some other harder to find pieces, and very nice, but also long off the road 89 XJS coupe (with great body and interior, less engine and trans) found its way here as well to be a good donor for the effort. It's been really helpful having that car as its amazing what big, and little, pieces you find you need when getting into a basically original 33 year old car.....

At this moment while trying to figure out a direction for the car, the front suspension, brakes, and fuel system are being gone through- all of that was basically original and 33 years old. We'll also probably swap out the rear axle in total as it's one of those Dana (not Dana 44-no drain plug) style units- an XJS oddball. The 89 has a Dana 44 style axle (even if it does only also have 2.88 gears), but it's a better place to start at least.....

I’m not sure what to do yet with this one- after such a good outcome with the LS1/6-speed manual trans in my 88 XJSC (see here- Jaguar Specialties), that direction seems possible. Or maybe something else???

Here are some pics- the car as it arrived (it was a lot of fun getting it off the flatbed with the front wheels locked to the left- it came with no keys…), a nice shot of it giving up the V12 (I’ve done this a hundred times but you never get over how heavy that-aluminum- Jag V12 is….),, and the 89 coupe donor as well.

Thanks for reading and talk soon…..

Andrew
Jaguar Specialties





 

Last edited by JaguarSpecialties; Apr 7, 2020 at 10:15 AM.
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Old Apr 7, 2020 | 11:22 AM
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Looks good in black. Keep us updated. I just got my own XJS convert up and running but it needs the suspension gone through. I'm down the road from you in San Jose. Unfortunately I got caught in a stalled home remodel project and my garage is filled with boxes. The cars are out in the rain. Hopefully I'll be able to do some work on them soon.
 
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Old Apr 7, 2020 | 01:58 PM
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Put a merc supercharged engine in it...

Or a twin turbo jdm engine in it.


 
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Old Apr 7, 2020 | 04:35 PM
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Beautiful car. Maybe you could find a nice Jag V12 for it?
 
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Old Apr 7, 2020 | 08:12 PM
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How about a more modern jaguar v8? I have a spare 4.0 sitting here in case my xk8s engine goes out, but I thought it'd also be cool to drop it in my xjs if the straight 6 goes out!
 
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Old Apr 8, 2020 | 01:50 AM
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What about something 'exotic' for a Jag... A diesel? Or a boosted V6? Or even a 2 rotor Wankel... With turbos of course... Or a Caddi 500?
 
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Old Apr 8, 2020 | 03:35 AM
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With so few produced I would have kept the V12.
Can't wait to see how it turns out.
 
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Old Apr 8, 2020 | 07:46 AM
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Sorry about my V12 quip above Andrew...I don't have much imagination sometimes. But having given it some thought, what I'd like is a lighter, nimble, sporty version of the car. Maybe a turbo-4 or 3 Litre inline 6 with a Getrag 5 speed from an old Chevy pickup. Rear anti-roll bar, Konis. Try to lighten it a bit.
 
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Old Apr 8, 2020 | 02:28 PM
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Originally Posted by JaguarSpecialties
Hello all, this is Andrew from Jaguar Specialties. I hope you are all well and please please do everything you can to stay that way. We're in the 4th week of a "Shelter in Place" order in California and it looks like it will be that way for a while longer. As fate would have it, a new car came into the mix right before the you know what hit the fan, so that was great timing. I meant to post this a while back (mid-Feb) but here it is. Maybe a fun read.....

So there’s a new cat hanging around our shop, and the story about how it got here is one of odd luck. The car itself is very unusual- it’s a 1987 XJSC, a somewhat rare “almost-convertible” version of the XJS coupe that featured very unique removable pair of T-tops and removable rear roof section. This model was built in the Jaguar factory in limited numbers from 1986-1988, starting with a coupe shell that was modified to this configuration. With only some 5500 made (out of 120,000 total XJS production), this was Jaguar’s answer for open-air motoring before they offered the XJS with a traditional folding top. I’ve always liked the XJSC, called the “Cabriolet” and I’ve owned a 1988 model since 2003, bought from the original owner. That car has been the subject of many conversion projects and upgrades over the years. Anyway, one Saturday evening recently I was doing what every red-blooded American does - that’s right, cruising through Craigs List looking for interesting cars. There was the usual junk, also some nice cars, and then right there in the Jaguar section was an XJSC- something that doesn’t pop up that often. Turns out it was a Lien Sale, offered by a local tow company after being removed from a local apartment complex parking lot. It was never claimed by the owner, so put up for sale.

Of course I had to go see it and in this case it was one of those 1 out of 10 used cars that was actually better in person than it appeared in the pics. It had a good body, decent paint, nice interior, only some 80,000 or so miles, and the optional rear hardtop with glass window. Some work was going on under the hood as there were 12 brand new, never used, fuel injectors (likely to the tune of some $80+ ea x 12 = $1000, ouch) loosely attached to the injection rail. As you can expect, I did what every red blooded American does after seeing a sharp classic car for sale that he doesn’t really need- I bought it. It became pretty obvious this one wasn't going back on the road with V12 power- it had been sitting idle since 2003 so not a good prospect for resurrection there. A few days later the injectors were on their way to a Jag owner in Indianapolis, the V12 engine and trans came out and went to a local British car nut, the catalytic converters went to the recycler, and we now had a nice car with a big hole under the hood…..

There is plenty to do before it’s ready for anything – the brake system needs a full rebuild, the fuel tank is a nice example of what nasty things happen when gas and water hang out together undisturbed for 10+ years, and of course most of the suspension bushings are falling apart. But all of those bits are easily available, all for the most part the same as regular XJS parts. And for some other harder to find pieces, and very nice, but also long off the road 89 XJS coupe (with great body and interior, less engine and trans) found its way here as well to be a good donor for the effort. It's been really helpful having that car as its amazing what big, and little, pieces you find you need when getting into a basically original 33 year old car.....

At this moment while trying to figure out a direction for the car, the front suspension, brakes, and fuel system are being gone through- all of that was basically original and 33 years old. We'll also probably swap out the rear axle in total as it's one of those Dana (not Dana 44-no drain plug) style units- an XJS oddball. The 89 has a Dana 44 style axle (even if it does only also have 2.88 gears), but it's a better place to start at least.....

I’m not sure what to do yet with this one- after such a good outcome with the LS1/6-speed manual trans in my 88 XJSC (see here- Jaguar Specialties), that direction seems possible. Or maybe something else???

Here are some pics- the car as it arrived (it was a lot of fun getting it off the flatbed with the front wheels locked to the left- it came with no keys…), a nice shot of it giving up the V12 (I’ve done this a hundred times but you never get over how heavy that-aluminum- Jag V12 is….),, and the 89 coupe donor as well.

Thanks for reading and talk soon…..

Andrew
Jaguar Specialties,, NO doubt in todays world an LS series is by far the best mod for an engine , so many performance mods , it seems endless!
especially for the costs involved , GM has got things figuerd out!, and the after market is following along!
me some of the guys were saying HENNESSY performance is one of those who is moving fast with the 2020 C8 Corvette!
wouldnt i like a 8 speed dual clutch gear box!! OOHHHYYA, with twin turbos!! Holy mackerl bat man?
ron





YES? just noticed thats a Cabrieolet! rare to start with!
 

Last edited by ronbros; Apr 8, 2020 at 02:31 PM.
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Old Apr 8, 2020 | 03:31 PM
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Given it's a fairly rare car, I would have kept the V12. Just because a previous mechanic started throwing parts at it didn't mean there was actually that much wrong with the engine.
 
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Old Apr 8, 2020 | 04:08 PM
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+1 on not 'lumping' the car due to its rarity.

What was wrong with the numbers-matching engine?
 
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Old Apr 8, 2020 | 11:33 PM
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Put the v12 back in with a 6 speed conversion. Easier to do the swap and other details like rack bushes with the v12 out anyway.
 
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Old Apr 12, 2020 | 05:06 AM
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Just watched Car Masters who made an electric car out of a Pinto. That would be different

Cheers
Steve
 
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Old Apr 13, 2020 | 10:53 PM
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Default Still no idea on a motor, but there are other things to do.....

Well, the jury is still out as to what motor is going back into this car, but in the meantime while options are on the table, there is time to do all of the things any 33 year old car (even with low miles) needs…. So I thought I’d get into all of that now and maybe by the time I’m done we’ll have a direction on the powerplant. All of the parts needed came from our regular suppliers, all too happy to provide them.....

Front suspension-

Mostly from sitting, all of the bushings and balljoint boots were falling apart, and the balljoints themselves were the old multi-piece design lowers and greasable uppers (all 4 were loose, so no good). Out with all of that. The suspension was completely diasassembled, all pieces were bead blasted (mostly for cleaning, we don’t have rust in California) and then powder coated to stay nice for a long time. Here’s a shot of the whole mess all spread out and ready to go back into the car. The front crossmember was completely cleaned up so we have a nice home for our shiny bits to go back to.



(yes those are an older set of Koni's I had lying around- they seem fine so I'll run them for a while)

As far as bushings and mounts, all 4 of the front subframe mounts were replaced (rubber style aftermarket- I find the poly versions here transmit too much vibration to the body). For the A-arms I am running polyurethane uppers and lowers, but the lowers are a different design as they are one piece with a raised ridge on either side. In the past I used a different design multi-piece lower poly bushing and found they didn’t work as well, nor hold up. This new version should be as good as the multi-piece in maintaining suspension caster by keeping the lower A-arm positively located front/rear (something the original Jag pieces didn’t do that well). Here are some pics of the lower arms and those new design bushings, and the uppers all completed with the more typical 2 piece design








And here are the A-arms back in the car waiting for the uprights and hub/rotors calipers to go on. The ball joints being used are the latest version, German made, sealed for life units that will outlast the car for sure. What's missing in the picture here as well is the front sway bar- that was removed to be replaced by one of our 1” front sway bar upgrade kits (our bar bender is way behind so as soon as the latest batch comes in, a fresh one will go on the car….)




Steering-

Not much needed to be done here- just a switch to the polyurethane steering rack mounts and we’re done. One interesting note- even though this is an 87 model, the car has a ZF steering rack. Must be that a dealer replaced the original with this new design model back in the day. Perhaps at some time, that was all that was available to replace a worn XJS rack…..



Rear suspension-

On the rear, I was going to do much as in the front- clean it up, replace the worn pieces and call it a day. However, this is an 87 car and the 84-87 XJS models occasionally used an odd “Dana” differential with no drain plug. Parts are hard to find for that one and the calipers bolt on in a weird way so I didn’t want to use it.. However, my 89 coupe parts car has the regular Dana 44 style diff with a spiffy finned alum cover, and on top of it all, only some 68,000 miles, so a better choice overall. What I really wanted for this car was a 94-96 later XJS IRS assembly with outboard discs and the 3.54 posi diff, but since none is available at the moment, I’ll freshen this one up for now. After a ton of cleaning, a new set of rotors, rebuilt calipers, 4 new higher performance cage mounts (not actually on yet in the pic), and 2 replacement late model trailing arms (with all new bushings and end link mounts for a rear sway bar) we have a nice unit ready to go into the car. Here are some pics of the unit before “freshening” and after all was done….. Nice




(Note- all of the speed sensors from the 89 - rear diff cover and on the hubs for the ABS- were removed and covered with small aluminum plates as none of that was needed for the 87.

Brakes-

Again, mostly from sitting, the brake system was pretty far gone. It appeared that the rotors were all original and the calipers (none of them) had been ever off the car. All of that came off and the calipers were fully rebuilt with new pistons where needed (4 in front, 2 in the rear) and all new seals. The parking brake pads and all looked fine and worked perfectly so just some cleaning and ready to go back in. The calipers all went back together easily and are ready to go. A nice set of Brembo rotors and Mintex semi-metallic pads all around finishes off the effort… Look at those nice calipers. I am trying a new black caliper paint on the front- left the rears raw. I've also become sold on braided steel brake lines so we'll used those all around....











So now what engine to use…. Well for the moment we can wait as I still need a usable XJSC fuel tank. Anyone have one?? They are different than the coupes…..



Take care,

Andrew

Jaguar Specialties


 

Last edited by JaguarSpecialties; Apr 13, 2020 at 11:38 PM.
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Old Apr 13, 2020 | 11:50 PM
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If you want to do a conversion to outboard brakes, you can use X300 rear hubs and halfshafts. They will bolt in and give the right spacing for camber. Depending on what wheels you use though, you might need to use XJ40 hubs with a slight smaller diameter disk.

I don't know about US market cars, but Canadian XJ40's have either 3.54 or 3.58 gears, those plus limited slip can be swapped over to the earlier XJS case.
 

Last edited by Jagboi64; Apr 13, 2020 at 11:53 PM.
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