XJ XJ8 / XJR ( X308 ) 1997 - 2003

The 1998 XJR 4.0 to 4.2 engine swap thread !!!:)

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Old Oct 8, 2011 | 04:57 PM
  #81  
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Originally Posted by avos
I have just checked the difference in distance, and I come to 7mm. I was also going to suggest to make a spacer on the intercooler side. Just make sure it looks the same (so similar sunken in), and use the newer rubbers/rings from the 4.2 XKR.
What's different about the new rubbers and rings?
 
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Old Oct 9, 2011 | 01:22 AM
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They have a lip on the flat site that fits into a grove in the rings. This avoids the rubber being sucked-in which could happen with the 4.0 style ones, or if you have a miss alignment (like now).
 
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Old Oct 9, 2011 | 06:47 PM
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Almost ready to go in....(still waiting on the spacer

 
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Old Oct 10, 2011 | 12:00 AM
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ok. So I got the motor in.....yeaayyy.....but now it looks like I have to take it right out.


I thought I can use the '04 XJR headers and I guess I'm 50% correct as the passenger side seems to fit, but the drivers side is very close to the steering shaft boot. I'm not sure how close I can go there without rubbing.

I'm thinking about using the passenger side since I have a flange for it and using the old '98 XJR header on the drivers side. What do you guys think? Anyone makes 4 screw flanges so I can make my own downpipes?










 
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Old Oct 10, 2011 | 01:05 AM
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sorry, can't help, have only used the original manifolds to keep it simple.
 
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Old Oct 10, 2011 | 01:15 AM
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Originally Posted by avos
sorry, can't help, have only used the original manifolds to keep it simple.

I'm probably going to use the originals since I want them to be even in length. I might have to make my own flanges if no one sells them
 
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Old Oct 10, 2011 | 05:04 AM
  #87  
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The later x308 lower steering columns looks like this, it doesn't have a boot, and it's a lot slimmer, a much better design that was needed as the old one had failures, and was from the 90's XJ40...I wonder if fitting one would give clearance of the later manifolds?
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So you're deleting the cats? how are you going about fooling the ecu? cat cheaters? There's a company on here that can make you what you need, Nameless Performance I think they're called.....
 
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Old Oct 10, 2011 | 10:21 PM
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This is really not as fun as it looks....
 
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Old Oct 10, 2011 | 10:32 PM
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Originally Posted by Sean B
The later x308 lower steering columns looks like this, it doesn't have a boot, and it's a lot slimmer, a much better design that was needed as the old one had failures, and was from the 90's XJ40...I wonder if fitting one would give clearance of the later manifolds?

So you're deleting the cats? how are you going about fooling the ecu? cat cheaters? There's a company on here that can make you what you need, Nameless Performance I think they're called.....
Well, the angle of the column makes it in the way of the exhaust. If I kink the exhaust, I'll be killing more flow than if I go with the original exhaust manifolds. The main reason why I was going to reuse the '04 ones was that I had the flanges and on the '98 someone took out the cats with the flanges.

A far as the ECU, I'm hoping that this should do the trick:

http://cgi.ebay.com/ebaymotors/Dorman-42009-SPARK-PLUG-NON-FOULERS-/330619505232?pt=Motors_Car_Truck_Parts_Accessories &hash=item4cfa754a50
 

Last edited by adam699; Oct 10, 2011 at 10:35 PM.
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Old Oct 12, 2011 | 02:00 PM
  #90  
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Old Oct 12, 2011 | 02:54 PM
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Excuse my ignorance but can you tell me how this will work?
 
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Old Oct 13, 2011 | 12:10 AM
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Originally Posted by Spitbarnatt
Excuse my ignorance but can you tell me how this will work?
Moves the secondary O2 sensors just a notch out of the direct flow of exhaust. Still gives it a variable reading but a notch cleaner....
 
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Old Oct 15, 2011 | 02:18 AM
  #93  
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Almost done with the exhaust part...






What's the biggest exhaust anyone put on these cars? I see that the Borla is 2.25". I'm starting to think I might be overdoing it with the 2.5" down pipes. I'm definitely going to have to upgrade things out back. Otherwise the transition from 2.5 to 2.125 looks funny.
 

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Old Oct 15, 2011 | 03:03 AM
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2.5" from cat to axle, then 3" back, no rear boxes - custom from Paramount Performance. Sounds good and adds torque.
 
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Old Oct 15, 2011 | 12:31 PM
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Originally Posted by Sean B
2.5" from cat to axle, then 3" back, no rear boxes - custom from Paramount Performance. Sounds good and adds torque.
Boxes? Mufflers? Can you share some pics of your setup?
 
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Old Oct 15, 2011 | 03:50 PM
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OK, here's a few off the car before I tidied it up with a rotary...

I've just ordered F.I.A race cats

btw - fit the gearbox connector heat shield!
 
Attached Thumbnails The 1998 XJR 4.0 to 4.2 engine swap thread !!!:)-dscf4317-medium-.jpg   The 1998 XJR 4.0 to 4.2 engine swap thread !!!:)-dscf4318-medium-.jpg   The 1998 XJR 4.0 to 4.2 engine swap thread !!!:)-dscf4677-medium-.jpg  

Last edited by Sean B; Oct 15, 2011 at 03:59 PM.
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Old Oct 15, 2011 | 06:29 PM
  #97  
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yeah I have 2.5 from cat all the way out over the axle out magnaflow sounds great and added a bit i think maybe just the sound makes it feel faster LOL, Cant wait till my buddy gets done with the new step manifolds and downpipes. Gave up on the headers too restrictive to get them fit right and flow well
 
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Old Oct 15, 2011 | 06:29 PM
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Originally Posted by Sean B
OK, here's a few off the car before I tidied it up with a rotary...

I've just ordered F.I.A race cats

btw - fit the gearbox connector heat shield!
Is there an original heat shield or do I need to fab one up?
 
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Old Oct 15, 2011 | 06:33 PM
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After messing with the 04 headers I concluded that the long tubes would be impossible to fit without some major mods. A bigger diameter log header might work.
Originally Posted by XJR-0220
yeah I have 2.5 from cat all the way out over the axle out magnaflow sounds great and added a bit i think maybe just the sound makes it feel faster LOL, Cant wait till my buddy gets done with the new step manifolds and downpipes. Gave up on the headers too restrictive to get them fit right and flow well
 
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Old Oct 15, 2011 | 07:01 PM
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Guys!!!. Look at what I just picked up There is a chance I might start her this weekend!

$80









 
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