XJ XJ6 / XJR6 ( X300 ) 1995-1997

from XJ6 to XJR

 
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Old 03-03-2019, 07:05 PM
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I have an opportunity of getting an entire not running 1997 XJR for cheap. I have a low miles 1997 XJ6. Has anyone attempted to supercharged the regular XJ6? Obviously I will have swap the ECU, shocks, and install supercharger. I do have experience and modified an OEM Miata with supercharger for track.
 
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Old 03-03-2019, 07:51 PM
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Originally Posted by annamiata View Post
I have an opportunity of getting an entire not running 1997 XJR for cheap. I have a low miles 1997 XJ6. Has anyone attempted to supercharged the regular XJ6?
Not that I'm aware of. Probably because it's so easy to just go out and buy an XJR

Obviously I will have swap the ECU, shocks, and install supercharger. I do have experience and modified an OEM Miata with supercharger for track.
And transmission
And wiring harnesses
And....crankshaft, cams, cylinder head, pistons....and....and.....

Cheers
DD
 
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Old 03-06-2019, 05:23 AM
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For future reference, what is the definitive list of items needed to swap in an XJR powerplant to a standard XJ6 Sovereign? As im mulling the idea as an alternative to buying a super v8 daimler. Id imagine you could use the existing xj6 harness up to a point, maybe for the electricals within the car, as they dont change, obviously you would need an XJR6 ECU.
 
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Old 03-06-2019, 07:15 PM
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Originally Posted by Alster370 View Post
For future reference, what is the definitive list of items needed to swap in an XJR powerplant to a standard XJ6 Sovereign?

Prepare for a snide reply:

Definitive instructions for swapping an XJR powerplant to a standard XJ6 Sovereign:

1. Do as Doug suggested and purchase a running XJR;

2. Replace the XJR trunk/boot badges with XJ6 Sovereign badges;

3. Done


Sorry, I couldn't resist. Obviously, to create a definitive list for a real engine swap, one would have to do a lot of research as to which components are different between the supercharged and normally-aspirated cars. In addition to the parts Doug mentioned, the transmission, suspension, brakes and much of the cooling system are different, just to name a few off the top of my head.

A good place research parts differences is:

jaguarclassicparts.com

Cheers,

Don
 

Last edited by Don B; 03-06-2019 at 07:24 PM.
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Old 03-07-2019, 05:05 AM
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Prepare for a snide reply:
I was prepared haha. There are occasionally rear-ended xjr6's that crop up on Ebay UK for little over a 1000, so If one has fully restored a standard XJ6, why not convert it into the Daimler super 6 we should have had, all the supercharged power with nice soft suspension. Although Il admit its probably easier to get an XJR6 and fit the daimler interior and suspension to it.
Just off the top of my head though, arent all XJR6's SWB? So if you wanted the full setup with the rear console and heated and reclining rear seats you'd need to engine swap route anyway.
 

Last edited by Alster370; 03-07-2019 at 05:08 AM.
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Old 03-13-2019, 02:54 PM
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I read something about someone having trouble blowing head gaskets and it turned out that someone blew their XJR engine and found a non -R engine and did exactly what your suggesting , but they blew the head gasket in that one. Turns out, the supercharged engine is of a lower compression variety (?) and super charging a normally aspirated engine blew the gasket because the original compression was too high?
Who knows...It's just what I recall reading.
That would suck...
 
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Old 03-16-2019, 03:05 AM
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It's all possible if you change enough parts. I would only ever recommend changing a complete XJR engine not trying to supercharge a naturally aspirated engine. The compression ratio is 8.5:1 compared with 10:1 for the NA engine. But equally important is the fact that the block is machined differently to mount the supercharger.

In addition to Doug's list, you will need the twin fuel pumps and controller from the XJR donor car, otherwise you will have insufficient fuel flow above about 4000rpm at wide open throttle.

If you have a complete XJR, then you can take whatever you need from it. As posted elsewhere, the list of differences can be researched on www.jaguarclassicparts.com by locking at all the part numbers which are different. If you are going to do such a project, then I think you will need to do your own homework.

Starter for 10:-

engine
transmission
prop shaft
engine ECU
MAF
Transmission ECU
Engine harness, though could be modified
transmission harness
cooling pack
fuel pumps (though might be easier to change the whole tank
fuel pump controller
various suspension parts (though you may choose to retain the ride/handling compromise of the naturally aspirated car)
 
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