I do direct replacement fit and tuned length but not cheap pm me if you are interested https://www.jaguarforums.com/forum/x...ds-argh-93301/

Done 20,000k,s on my car so far no problems cant be said for second hand ones most I got out of those was 2,000k,s and did them 3 times in 3 years at an average cost of a a grand each time do your sums which is cheaper

 

Hi Doc and XJREngineer (Andy)

I have been impressed at the improvement in my humble 3.2's performance with the 5' crank sensor bracket and a pod filter.
I am thinking of tackling the exhaust for 'a bit more'
It might seem illogical in a 3.2 - I could get an XJR for about $11000, but I would have to start again going through the whole car, and the one I've got is a good'un.

Locally, Blue Dorward (ex-TWR) runs a workshop, and I could ask him to fabricate up an exhaust.
I like the idea of the TT-type pipes as per AJ6 Engineering.
I like the look of Doc's extractors, which I understand were made from plans from Andy.
I don't understand why Jaguar put such 1920's-style exhausts on the X300 - do they work better than they look?
Would a set of your extractors running two long secondary pipes back to the gearbox work well?
Andy, do you sell the plans still?
Or alternatively, Doc can you sell me a set of extractors?

thanks, Al

 

Hi Al
I have already PM,d you they are not cheap am doing a set for someone at the moment they are similar to Andy's but slight changes have been made

If you really want a performance boost change the diff gears you already have the advance bracket and pod filter

I have spent an enormous amount on my car and its an XJR to start with

The best seat of the pants improvement was changing the diff gears

I have constantly seen higher speeds now I have the 3.58 tail gears from a naturally aspirated XJ6 than I ever did with the 3.24.1 XJR gears

The car now cruises 400 RPM higher but that 400 RPM puts it smack bang at the bottom of the torque curve so instead of the car having to kick down and waste time doing so and then screaming its head of the other car has already beaten me its not like that now you should see the looks on there faces when I am right next to them

I have even beaten a 09 WRX on the freeway the look on his face priceless

Like I said it was the best bang for dollar I ever spent

My stepson has a 2010 VE commodore V6 3.0 engine 6 speed auto station wagon it also originally ran 3.36.1 tail gears he has spent a fortune on it trying to extract more power when I said change the gears he said no all the guys on the forums do all these other things

A month ago he finally listened to me changed the 3.36.1 tail gears to 3.77.1 its now the fastest naturally aspirated 3.0 litre VE station wagon in Australia with time cards to prove it and his tune was only giving him 58% throttle opening when he gets the correct map look out
go figure

 

IIRC Al's 3.2 will already have a 4.09:1 final drive! Not sure you'd want to go further than that, but it does make the 3.2 seem quicker than you'd expect - and no doubt also contributes to the lack of difference in fuel economy CF the 4.0...

 

I don't know the diff ratio in the 3.2 either, but at 100 km/h its doing about 2400 revs from memory - I will check again tomorrow.
My 3 litre Subaru Tribeca with 5 speed auto will sit on about 2400 at 100 km/h too.
The 4 litre 4 speed Ford Falcon does about 1800

 

Has anyone found a source for the US variant manifolds? I'd really like ot replace my cracked ones. I can't find a single one.

Thanks!

 

I presume you want good used ones, not brand new?

I found good ones on Ebay. Gotta keep looking, though. They don't come up every day. Non-cracked ones are probably getting a bit scarce by now.

Cheers
DD

 

I'm actually willing to buy new. Are they all the same (i.e. those like mine with the o2 sensors and the EU vehicles)?

 

The O2 sensors are in the downpipe, not the exhaust manifold. For the front manifold there are 2 choices: with or without air injection. For the rear, there is with or without air injection, and with or without EGR.

For a North American car you will have air injection, and for all except the 1995 XJR, EGR. Thus the part numbers you need are NBC2902AD for the front and NBC2903AC for the rear.

 

See Exhaust Manifold Front - NBC2902AD | Jaguar X300 - XJR | Jaguar | British Parts UK and Exhaust Manifold Rear - NBC2903AC | Jaguar X300 - XJR | Jaguar | British Parts UK

I dread to think what international shipping will be. They're sodding heavy.

 

As far as I know, Jaguar Classic Parts can provide them at no extra shipping charge to your local dealer in the USA. Worth inquiring at your local dealer anyway!

 

While JCP can be surprisingly reasonably priced for some items, for manifolds they want about twice was British Parts want.

 

Ordered these. Thanks for the link and thanks to Jagboi64 for the part number clarification! Expensive but I like the idea of renewing pretty much everything I can right now and riding comfortably. I've had this VDP for a year now and have:

1. new battery
2. new thermostat
3. replacement floor mats
4. new rearview mirror
5. reattached third brake light
6. new headliner
7. new starter
8. new rear brake pads
9. new tires
10. replace original rims with identical chromed versions
11. mesh grill inserts
12. body work and a passable paint job (not showroom but not horrible)
13. cam cover gasket and o-ring
14. one ignition coil and all plugs
15. cleaned throttle body
16. ac pulley bearing renewed
17. Andy bracket
18. pulled headlamps out and cleaned in soap solution (works)
19. some oil filter o-rings recently (leaking like crazy)
20. right front upper ball joint
21. replaced factory stereo and speakers/ added subwoofer
22. replaced gearshift knob with a nice wooden one
23. Replaced center console lid with a recovered non cupholder version.

What I am currently doing in the next coming week for sure:

24) replace brake switch
25) replace exhaust manifolds (new)
26) replace all ignition coils / change iridium plugs to Champion copper at that time
27) replace all shocks with Touring Bilstein shocks, all shock bushings and mounts.
28) replace A-frame bushings (once I find the part number)

Ugh. I love this car....

 

How did the new manifolds work out? Any issues with them not being the genuine article?

 

Decided to buy genuine. Here's hoping they'll never need changing again!

 

doc, do you still lurk here or have you gone X308? (I have lost your email from 2013)

I am seriously interested in a set of your headers, with a view to one day maybe buying an XJS, and whilst the heart says V12, the head says 6 cylinder and gently modify...

So, I know the AJ16 manifolds are different to AJ6 , in terms of cylinder head bolt pattern, etc. So I realise your AJ16 manifold wont directly transfer to an AJ6 engined XJS.
But if the exhast port spacing is the same, presumably the flanges could be cut off and AJ6 ones fitted. Of course, this doesnt take into account other factors - for instance, I dont know if the two different straight 6's are set at different angles.

But can you let me know if you can still make me a set?

regards, Al

 

Beautiful craftsmanship!!

 

Al I'm still here just made a set for a guy in Sydney he is building a killer AJ16 with a 2,3 litre capacity twin screw and custom pistons and rods ported head

when I am in Sydney next I am going to see it

On the other the guy that makes the headers for me had a 7.2 litre V12 race XJS in his shop oh my god that's what I want
The sound of the thing making close to 500 HP in a stripped out XJS and the engine mounted further back in the car for better balance we drove it round the block after he did some pipe work on it
I told him when the owner has had enough and wants to sell it I'm first in line that engine sounds like nothing I have ever heard before let alone how the car goes
sends a shiver down your spine

 

I have told Blue Dorward to sell me his 400bhp 6.4 litre TWR he built in 1983, when the time comes. He didn't comment...
One can only ask..


cheers, Al

 

Where did you get them??

I'm looking forwards OEM