Just wondering what might be out there for the 4.0 95 XJR thanks guys for any info I plan on a nice free flowing exhaust and I have a friend that i the chief tuner for SVT ford hes gunna do a custom tune for me as well.

 

Lack of demand means not much by way of go-faster parts for these cars.

There is (was?) somebody out there making a crank pulley to speed up the supercharger but the couple people I've heard from were not happy with the results and went back to the original pulley. Initial power was improved but the increased heat caused a loss of power after anything beyond a short burst, it seems.

I think Mina makes an exhaust system (actually for the regular XJ6 but I guess it fits the XJR properly) that might help a little.

Another outfit....can't remember who right now....is (was?) selling a low restriction air intake but it didn't do much except draw hot air from the engine bay which is the last thing you need with a supercharger.

Anything you do do to keep the air charge cooler seems to work well, however. Until you can get it really cold, however, this is more a matter of keeping the horsepower you already have rather than making new horsepower.

Andy Stoddart, an ex-Jag engineer, sells a bracket to reposition the crank sensor and give more timing advance. It works well. Max power doesn't change but part trottle torque/response is better.

I changed from the 3.27 diff to a 3.58 and it made a decent improvement, especially coupled with the timing bracket.


Cheers
DD

 

I think I will get the timng bracket any link or ifo on where to get it?? I would like to put in higher gears as well thats always a nice effect on acceleration. The guy that is gunna tune it is a genius at tuig. He cracked the audi code, mercedes, and many others he tunes all of SVTs cars. Hes great and he said he can get me a nice jump in power with a tune, he says that jag is very safe with their tunes. I have a guy that custom makes all my exhausts and hes great so Ill be using him for exhaust go 2.5 all the way out with magnaflow muffs. I use to own a 91 supercoupe and built it nicely, I figure it would be easy to take off the blower and have it ported and put a smaller blower pulley maybe even upgrade the intercooler and up the boost a bit. Where do you get rear end gears is there a diff that fits with a better ratio?? Thank for the help also Im really shocked there isnt a chip for these cars hum

 

Also anything I should look at dont know the problem areas with these cars yet I drove it and it drives well for 102k, suspension feels good, runs strong too. I am gunna change all the belts, change the plugs too NGK plugs (my fav plugs), change fuel filter, oil filter, and a few other things to get it up to par.

 

I used to have an SC as well :-).

With your SC experience you know that there's not much point in increasing boost without upgrading the intercooling, as you mentioned.

Let us know if the exhaust really helps.

The 3.58 diff is standard issue on the standard XJ6. Might be hard finding one with limited slip, though. I got lucky on that one. Of course you can take the open 3.58 and install a limited slip carrier. The diff itself is a direct swap.

For the timing bracket go here http://xjr6.co.uk/ and look up a guy who goes by "XJREngineer". He has the brackets.

Cheers
DD

 

and dont forget water/alky injection to reduce inlet temps.
often you dont have to modify the intercooler system.

it has to be boost dependent,variable rate, many good units out there.

google water injection

 

I wouldn't go for a blower off of an SC, I'd think that would be a little on the small side. One of the blowers off of an STR however, now you're talking. There are a few people upgrading to twin screw blowers so you might be able to get a take-off fairly cheap.

 

The SC and the XJR/6 both use the M90 supercharger. I know of one guy who is using an M112 on an XJR/6...lot's of fabricating required to fit it.

I don't know which version of the M90 Jag used but some of them can be tricked out a bit.

Cheers
DD

 

I didn't realize they both used the same sized supercharger, that's good to know!

 

Yeah Im working with Andy and getting the custom pieces made so that I can run the larger M112 I think it will be pretty fun after that

 

Heck yeah! Sounds like a hoot!
Personally I want an XFR with a twin-screw, but I'm just demented.

 

Id love to have a twin screw but I think what needs to be done to make it work properly is gunna be very spendy.

 

Of course it will, it's a Jaguar. Some things are worth it.

 

this is very true LOL well when you fgure it out Ill be the 1st to trade my M112 for a twin screw.

 

if i was gonna make that much changes ,and labor to accomplish,, id go twin turbo, and custom intercooler,,+ water alky injection.

sure would find the engines integrity level,, but im guessin thats around 600hp!

 

you can put any engine in anything, just gotta do it!

ist you need a well equipped work shop,and machine shop.

just try ,you may surprise yourself.