pix of car and the engine that makes all the sound ,all twelve cylinders exits out the drivers side, 5" outlet, just so i can here all 12, absolutly awesome,

at 7000RPM.



how do i attach a soundclip,and what recording device would i use??

im from 2-3 generations back compared to you guys!

Ron

 

LOL - no doubt it's awesome, but how many of us are gonna go that route? As far as posting the sound... youtube? Although that seldom does things justice.

 

thats because your average run of the mill guy who slaps some magnaflows on his XJS doesnt have a clue how much the catalytic converters affect the sound.
find a clip of a catless jag or a jag with open headers and your gonna crap your pants.
New Exhaust for my Jaguar XJS - YouTube

 

I've deleted the cats on my xjs but retained the stock exhaust and mine (although it runs like crap at the moment) sounds NOTHING like that! Perhaps it's just my speakers, but to me that sounded like an old truck!

 

thats because he was running open headers.

and i could definately tell it was a V12

 

yah, sound clip would not do it any justice.

its like there is no way to reproduce the sound of a top fuel engine in person.

been there ,tried that.

 

Quite some time ago Gary Walker Jaguar Sydney, Australia modified a 1980 XJS along these lines.
engine: 5.5 litre DOHC V12 increased to twin turbo IHI 7 litres.
Performance: 850bhp @7500rpm and 880 ft/lbs measured on a supr flow engine dyno.
If you want additional info, send email to rseignior@xjsinvestments.com.au or let me have a fax no and I will copy article and send to you.
Regards, Rob Seignior,Australia.

 

Thank Rob!

Warrjon, do you know anything more about those Twin Carb'd intake manifolds? looks like a standard manifold off of a carb'd V6, or is it something custom? any idea where to get them and for how much?

 

I had a request for some more pics of the TT XJS. I had a massive PC meltdown so I'll post what I have left. I did have some of the underneath - there were some good ideas on strengthening the LCA's but these are gone.

The black car was built by Gary Walker from a burnt out wreck and reported has +700hp I am not sure about the silver one although I do know it is TT as well.

That 609hp was with 300mm slicks wheels spinning on the dyno, this thing has unbelievable torque, and sounds awesome at full tilt.

 

Warrjon, thanks a million for posting those twin turbo pics. I smell a business opportunity for somebody to develop a twin turbo XJS kit that sells for $6k!!!!

 

Yeah I thought about it as I am going down the SC route - BUT the issues are:
3 different ignition systems
HE has too high compression so heads have to come off
ECU upgrades how to do this without going aftermarket

 

if i can find a carbuerated plenum then im keeping the V12.

 

Disclaimer: I am not a mechanic by any stretch of the imagination, just a dude who likes to go fast. Could these issues be overcome at reasonable cost by:

1. part of the kit includes a universal ignition system upgrade (factory ignitions have well-known weaknesses), or upgrade your own ignition separately

2. does some type of 'plate' exist that sits between the decks and the cylinder heads that would reduce the compression ratio? Could one be manufactured?

3. wouldn't this type of work necessitate a full custom tune in any case?

Forgive me if these are basic questions, I genuinely do not know and am seeking enlightenment.

 

youd need a tune, a decompression plate or low comp pistons. something a little less drastic than flathead pistons for moderate power out of the boost, im assuming since the blocks are almost the same, that the ignition system could be universally upgraded, and then youd need an ECU tuned for the proper fuel files.

 

There are 3 different ignition systems on the XJS to deal with. The system could be upgraded to distributorless. Issues a) would require owner with ability to instal and tune or would need to be professionally installed -cost; b) No knock sensor in the V12 so tuning would need to be done on a dyno.

Yes a decompression plate can be used but the heads have to come off. The green TT I posted used this approach.

Yes - how do I tune the ECU?? and 2 different types

This could all be done using aftermarket ECU but this would add significantly to the cost. ECU alone $1k plus tuning.

 

So if I'm understanding the situation correctly, one could:

- order a kit
- take the car to a mechanic
- have complete kit (distributorless ignition, decompression plate, ECU, turbos + plumbing, etc.) installed
- put it on a dyno for custom tune
- kill some Ferraris

Am I right? So you're thinking how much for such a kit, and how much for labor? You already said ~ $1k for tuning.

 

Doesn't sound so bad when you put it that way. Wouldn't be worth me doing as I live in Aus, shipping would be a killer. A supercharger kit on the other hand hmmmm. Maybe worth thinking about I'll explore that next year when I start my build.

 

It really doesn't sound that bad, as long as the kit is fairly universal and comprehensive across the model year variances, even if performance compromises need to be made. Those seeking to eke every ounce of performance will go for full-on customization in any case.

What benefits are you smelling re: Supercharger vs. Twin Turbo? Simpler plumbing? About the only thing I'm opposed to is breaking the smooth, awesome sweep of the hood. I don't even like the power bulge on the facelift & I6 XJS models. No bulges, scoops, louvers, vents, or perm-open hood (bonnet) need apply.

 

My goal is to have an almost totally stock looking XJS, albeit with wider wheels under standard rear guards. So there are no bonnet mods in my plan, maybe vents similar to XKR. A Turbo install I think bonnet vent are a must to get the heat out otherwise there will be heat issues. We have 3 TT XJS here in Aus and ALL of them have vented bonnets.

So I am planning a centrifugal supercharger. I initially wanted a Whipple (but not 2) and getting this under the bonnet was almost impossible without major surgery.

The V12 has an abundance of torque on hand from quite low RPM so I think the CF will work. Lister used 2 CF Albrex superchargers on the Lister XJS MKIII and made 700hp.

A SC install will provide smoother power delivery than TC. If I can manage a single SC it will simplify installation. No exhaust mods needed in a basic install.

I think it can be done with one and a small splitter type manifold to each plenum. A W2A IC can be incorporated into the splitter.

So in a nutshell if I can engineer a single SC installation
Located in place of the idler pulley/air pump.
IC 1 input 2 outputs could be A2A or W2A
Ignition options dual Ford EDIS or GM Delco (will require removal of distributor)
ECU?? Dual Delco 808's or aftermarket

cheers
Warren

 

More powere to ya! And if you can develop it with a kit in mind, or at least simple enough to be reproducible, even better!