RE: Jaguar XJR X350: PH Buying Guide
Discussion
dme123 said:
I'll go with the experience of ZF, who designed the box and tested it for countless hours and rated it to 600NM and then designed another version that could actually cope with 700NM+. LIke all these things you'll get lucky for so long, but eventually it'll catch up with you. Maybe it means the box dies at 150k instead of 250k and you're happy with that, but to believe it has no impact whatsoever and carries no risk is foolish. It might also mean the box dies the first time you give it what for; that's what design specs are for.
The ZF6HP28 that the 5.0 litre supercharged cars used was also rated to 750NM.
I am fortunate to be acquainted with a senior ZF engineer who gave me the “don’t change the oil” advice, and confirmed my belief that whilst every piece of machinery has designed performance specifications, those speciations include a significant safety margin. Naturally, venturing too far into that margin, too frequently, will shorten service life. The opportunity to use full bore acceleration, from a standing start, to delimited maximum, is however almost non existent, in any case, surplus torque is dispersed in burned rear tyres, not by overloading the transmission in such a light two wheel drive car. Much greater stresses are placed on these gearboxes in other applications having far greater weight and four wheel drive grip, even in such vehicles they are rarely troublesome.The ZF6HP28 that the 5.0 litre supercharged cars used was also rated to 750NM.
Edited by dme123 on Friday 22 June 01:21
Edited by Etypephil on Friday 22 June 04:40
I’ve been looking on and off for around a year.
Couple more things to mention.If the heater doesn’t blow hot on both sides ( fairly common) you could be looking at a fair size bill as if a flush doesn’t clear it, it’s a dash out job.
Also the ride quality can vary enormously depending on whether it’s has recent work or not.The smoothest I drove was a 140K mile car that had over 2 grand spent on suspension in the last couple of years, in fact it was the only one that drive like a Jag should ride comfort wise.
For me the sweet spot is the 4.2V8 not S/C model. Plenty quick enough, quieter without the annoying supercharger wine that seems out of place, and better riding to boot.
Couple more things to mention.If the heater doesn’t blow hot on both sides ( fairly common) you could be looking at a fair size bill as if a flush doesn’t clear it, it’s a dash out job.
Also the ride quality can vary enormously depending on whether it’s has recent work or not.The smoothest I drove was a 140K mile car that had over 2 grand spent on suspension in the last couple of years, in fact it was the only one that drive like a Jag should ride comfort wise.
For me the sweet spot is the 4.2V8 not S/C model. Plenty quick enough, quieter without the annoying supercharger wine that seems out of place, and better riding to boot.
sjc said:
I’ve been looking on and off for around a year.
Couple more things to mention.If the heater doesn’t blow hot on both sides ( fairly common) you could be looking at a fair size bill as if a flush doesn’t clear it, it’s a dash out job...
This. We had a 3-litre X350 in the family for a good few years - ex Police, had mounts for a gun-box in the boot and the auto-lights had been deactivated somehow! Getting heat became a problem, it had a new heater unit I think, big bill. Also door handles previously mentioned. And the NSF suspension failed. Supreme comfort for long journeys, but it isn't remembered as fondly as the XJ40.Couple more things to mention.If the heater doesn’t blow hot on both sides ( fairly common) you could be looking at a fair size bill as if a flush doesn’t clear it, it’s a dash out job...
My old man has had a few X350 XJ's over the years, a mix of V6's and V8's. Strangely enough his real world consumption difference between the V6 and the V8 really was not that much, possibly due to his driving style and type of use, he puts it down to the V8 not having to work as hard.
The real gem of the range and his absolute favourite to own was the 'Super V8'. The Super V8 has the same supercharged V8 as in the XJR but is wrapped in the softer body/spec of a Sovereign. It has an awesome power delivery where there's an ever so slight delay, the bonnet lifts a fair bit and then it just takes off. A real sleeper of a car!
The real gem of the range and his absolute favourite to own was the 'Super V8'. The Super V8 has the same supercharged V8 as in the XJR but is wrapped in the softer body/spec of a Sovereign. It has an awesome power delivery where there's an ever so slight delay, the bonnet lifts a fair bit and then it just takes off. A real sleeper of a car!
Etypephil said:
8bit said:
Probably do-able but easily and inexpensively? Very much doubt it - how do you manage that?
A smaller supercharger pulley (10%), better intercooling, exclusive use of 99 octane and a bespoke remap (confirmed on a dynamometer) to fully exploit the fuel and increased boost. Less than £1,000.8bit said:
Etypephil said:
8bit said:
Probably do-able but easily and inexpensively? Very much doubt it - how do you manage that?
A smaller supercharger pulley (10%), better intercooling, exclusive use of 99 octane and a bespoke remap (confirmed on a dynamometer) to fully exploit the fuel and increased boost. Less than £1,000.sjc said:
8bit said:
Etypephil said:
8bit said:
Probably do-able but easily and inexpensively? Very much doubt it - how do you manage that?
A smaller supercharger pulley (10%), better intercooling, exclusive use of 99 octane and a bespoke remap (confirmed on a dynamometer) to fully exploit the fuel and increased boost. Less than £1,000.Mine is going in for a bespoke remap, I would be the happiest man if it makes 500bhp
Already has all the usual mods...8bit said:
Etypephil said:
8bit said:
Probably do-able but easily and inexpensively? Very much doubt it - how do you manage that?
A smaller supercharger pulley (10%), better intercooling, exclusive use of 99 octane and a bespoke remap (confirmed on a dynamometer) to fully exploit the fuel and increased boost. Less than £1,000.There are plenty of companies out there. Paramount are probably one of the better known Jaguar tuning specialists. Have a chat with them in the first instance: https://www.paramount-performance.com/Jaguar/
8bit said:
I still don't think you'll get near, let alone over a real, proven 500bhp with that lot. You got any links?
I didn’t come here for an argument. I do indeed have before pulley, after pulley, plus after pulley and final optimisation graphs, all from the same dynamometer, thanks. You, of course, are free to think whatever you wish.CharlieAlphaMike said:
8bit said:
Etypephil said:
8bit said:
Probably do-able but easily and inexpensively? Very much doubt it - how do you manage that?
A smaller supercharger pulley (10%), better intercooling, exclusive use of 99 octane and a bespoke remap (confirmed on a dynamometer) to fully exploit the fuel and increased boost. Less than £1,000.There are plenty of companies out there. Paramount are probably one of the better known Jaguar tuning specialists. Have a chat with them in the first instance: https://www.paramount-performance.com/Jaguar/
Etypephil said:
8bit said:
I still don't think you'll get near, let alone over a real, proven 500bhp with that lot. You got any links?
I didn’t come here for an argument. I do indeed have before pulley, after pulley, plus after pulley and final optimisation graphs, all from the same dynamometer, thanks. You, of course, are free to think whatever you wish.sjc said:
In fairness the parts alone come to three grand plus fitting and vat I assume , so a lot more than the £1000 that was suggested would get you there?
Paramount are extremely expensive. Powerhouse are the people for blower pulleys; less than £500 for the 10% one, fitted, including machining the supercharger snout for clearance. Any local radiator specialist will make a better charge cooler for C£200, dynamometer time and bespoke mapping can be bought for £50 per hour; I spent £250 on mine. Any more, and you are paying designer label money for what will almost certainly turn out to be a generic map unable to exploit your other modifications.Etypephil said:
Paramount are extremely expensive. Powerhouse are the people for blower pulleys; less than £500 for the 10% one, fitted, including machining the supercharger snout for clearance. Any local radiator specialist will make a better charge cooler for C£200, dynamometer time and bespoke mapping can be bought for £50 per hour; I spent £250 on mine. Any more, and you are paying designer label money for what will almost certainly turn out to be a generic map unable to exploit your other modifications.
So you wouldn't need a better flow exhaust or cats Phil?Etypephil said:
I didn’t come here for an argument. I do indeed have before pulley, after pulley, plus after pulley and final optimisation graphs, all from the same dynamometer, thanks. You, of course, are free to think whatever you wish.
Could you post the before and after pulley graphs please? Tasjc said:
So you wouldn't need a better flow exhaust or cats Phil?
If one needs every last bhp & nm, to go racing, for example, otherwise they give very little extra, in return for a lot of money. A decent bespoke exhaust system incorporating 200 cell catalytic converters will cost around £2,200, to yield perhaps 25bhp; a poor deal in my view, although the car will sound much more powerful, the proof is on the dynamometer, not in the ears.Gassing Station | General Gassing | Top of Page | What's New | My Stuff