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I presume you realise that new mags will cost (what?) 10%~20% of the value of the car.
Better to find some noble gentry selling a car with custom mags and sad suspension.
(I'm assuming the suspension fix might cost less than the mags)
Let's just call this a fantasy custom car build for the moment, I suspect that if you actually did everything listed, with the money spent, you would have been able to purchase the supercars you are trying to embarrass instead.
Maybe if someone has more money than sense, they'll be inspired by the above information to produce the lightest and quickest luxury saloon ever, based on the x350 because it is probably one of the lightest chassis available. I will do it all immediately after I win the lottery
There are slightly heavier products available to make these modifications which can be bought for much less money, I think that knowing which modifications give most bang for the buck is very useful if you want to continue enhancing your big Jag driving experience.
Buying expensive weight reduction upgrades periodically over long periods of time is a more realistic option.
Last edited by SABARRAS; Feb 24, 2021 at 02:10 AM.
Removing sound deadening probably isn't worth the effort because the risk of experiencing interior vibrations is high and may force you to add it back.
The guy in this video removes the sound deadening from a Mustang which isn't much smaller than a XJ, he collects most of what he removes in a bag and weighs it from 6:00 - just under 6.3 Kg (14 lbs) - it's a messy job and the weight saving isn't very impressive. Perhaps lighter, made to measure carpets might provide more weight loss or if the car is reserved for the track, no carpets at all.
Here is a list of weight savings (in pounds) of various Mustang parts, the Jaguar's will probably be heavier in many cases due to greater size and luxury but it gives a good idea how much can be lost if your are stripping a car out to full race spec.
11.5 kg (25.3 lbs) for a reclining composite sports seat, This could be a big weight reduction if you are willing to reduce the luxury levels of the Jag's interior. I suppose you could make them match the other trim.
"Like the seat, the base is powerful and lightweight. Consider this example. The Sportster GT weighs about 35 lbs., the metal base and slider are about 8 lbs., and the bolts are an additional 2 lbs. For two GT seats, that comes to a grand total of 90 lbs. In contrast, stock OEM seats of a BMW are stuffed full of electronic and mechanical hardware and will typically weigh around 75 lbs. each. This means that you will shave a full 60 lbs. off your vehicle’s weight by switching to Sportster GT."
If you want the light weight but still need 4 seats occasionally, remove the 32 Kg (70 lbs) rear seats and replace them with these 2-5 Kg (4.4-11 lbs) seats from kart seat specialist, Tillet. https://www.tillett.co.uk/shop/shopD...r+Racing+Seats
They could be trimmed in leather to match your interior and still remain very light.
If you are OK with fixed bucket seats with minimal padding, the above seat weighs 5.5 Kg with the suede pads, they would reduce the front seating weight by another 21 Kg, the brackets + runners are about 3 kg each side so slightly lighter than the Recaro Sportster GT suggested earlier, base saving another 3Kg approx.
So one of the lightest seats on the market fitted at the front will reduce the curb weight weight by a further 24 Kg.
Last edited by SABARRAS; Feb 24, 2021 at 03:03 PM.
Have you ever heard of "Drillium"?
It isn't an exotic lightweight material but aluminium bicycle parts with as many holes as possible drilled into them to make them lighter. Ideally the holes didn't effect structural integrity but that was based on guesswork in the 70s.
Obviously this would be more challenging on the Jag and would require the chassis to be entirely stripped to make safe decisions about where to drill. This is another extreme solution only suited to a full custom car build project.
Last edited by SABARRAS; Feb 24, 2021 at 02:58 PM.
I estimate that the Jaguar carpet (weighs 18 kg (40 lbs) altogether based on those earlier links about the Mustang and Dodge Challenger.
Jaguar's OEM carpet could be replaced with special, lightweight nylon aircraft carpet if you want to maintain some comfort and sound deadening.
8.6 Kg - Carbon fibre prop shaft 13.2 Kg - Out with the Alpine sound system, in with the Harman Ecotect lightweight system. (Or no sound system at all for 23.2 Kg subtracted)
21.8 Kg - Total
Updated curb weight:
1449 Kg - 21.8 Kg = 1427.2 Kg (3140 lbs)
24 Kg - Extra weight off from Recaro Sportster GT if a Tillet B5 carbon fibre fixed bucket seat with suede padding is fitted instead. 5 Kg - Lightweight aircraft grade carpet replacement.
29 Kg - Total
Updated curb weight:
1427 Kg - 29 Kg = 1398 Kg (3075,6 lbs)
If you are going to change the interior with lightweight seats and carpet how about getting the interior re-trimmed with aircraft grade engineered leather to get everything matching with a more interesting colour and texture than was offered by Jag back in the day.
If this is some rich guy's dream project and money is no object, naturally they will go for a Titanium exhaust system, which at 40% lighter would make a system like Quicksilver's stainless system (above) weigh just 12.24 Kg, a weight reduction for a cat back system of 8 Kg
Even lighter and probably only suitable for the tail area of the system, aluminium exhausts - as seen with lightweight nuts and bolts, aluminium is less than 1/2 the weight of stainless steel.
"Avoid keeping unnecessary items in your vehicle, especially heavy ones. An extra 100 pounds in your vehicle could reduce your MPG by about 1%.6 The reduction is based on the percentage of extra weight relative to the vehicle's weight and affects smaller vehicles
more than larger ones."
So far we have lost 542.2 lbs in our fantasy custom build so if the above statement is true, fuel ecomomy should have improved by about 5.5%
"Today’s cars rely heavily on conventional iron and steel alloys, which make up 45 percent of most vehicles’ weight. Replacing established steel alloys with advanced, lightweight materials could potentially reduce the weight of a vehicle’s body and chassis by up to 50 percent. And this has a big impact on a vehicle’s efficiency -- reducing a vehicle’s weight by 10 percent can improve the fuel economy by 6 to 8 percent."
So...when are you going to buy one Sabby? And do all this wonderful stuff.
There are some here into performance enhancements and that's awesome...
Except, I just spent $800 on some "standard maintenance" items...admittedly 2/3 of it professional labour.
My wife is horrified. I imagineI told her "I love my Jag more".
Oof!
I'm on the look out for one but I'm waiting to find a buyer for my flat in Paris first.
There are quite a few for sale in the UK, low mileage ones <sub 80K cost around £10 grand, hopefully the price hasn't bottomed out yet because it won"t be until the second half of this year before I can consider getting one realistically.
Until then I shall research and imagine all the possibilities, sharing what I find here. These threads are like my note book.
