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I guessing no-one told you early hubs crack with stock levels of power. Your plans for an LSA might need some re-consideration in this area.... Adding more power and and perhaps a sticky tire could be catastrophic.
Jag redesigned the hubs many times over the years. The strongest being a facelift XJS / XJ40 with the outboard brakes.
I'm guessing I will find this and remedy this myself thanks mate. Already have plans for this.
I am a Kiwi. We find a way
But thanks for chiming in.
Craig
Kiwi? I though you were from Stockholm. What ever remedy you come up with on your "finished" rear cage is probably better than what you have now. Good luck. I'm honestly trying to help out a fellow coupe owner... but you're clearly an Andew minion and you paid a lot for that privileged. LOL
Last edited by icsamerica; 12-16-2019 at 02:09 PM.
Hey, as someone who has beefed up a SBC and has yet to still tackle the rear end ( can't get the trailing arms off ).
What is the best idea to beef up these hub carriers without swapping the entire rear cage with a later model?
Late XJS or XJ40 rear hubs and shafts... you can leave the existing inboards for the E-brake if they work. The XJ40 hub will need to be fitted with the XJS fulcrum bearings because the shaft dimater is smaller on the XJ40. It's just easier to do a full swap with a newer cage. There are so many improvements to the late IRS.
I've heard of people welding and boxing the area too
Last edited by icsamerica; 12-16-2019 at 01:56 PM.
I have been quietly watching this thread for a while now with great interest (obviously) and just wanted to thank Craig for sharing the details as he goes along. For something as groundbreaking as this project, he seems like absolutely the right person to do it. But I think maybe a trend has already started....
Although Craig is only 1 of 2 customers using the 556hp LSA engine in his Jag (that I know of, the other one is a 90 XJS in Michigan- also underway as we speak), more and more of these later model/later generation LS engines are finding Jag homes as well. A very popular unit is the 2010 and newer L99 (410 hp. 430 ft-lbs torque) eng and 6L80E (6 speed auto) trans from the 2010 and newer Camaro and that has been installed in several Jags to date and more are in process. Attached below are some pics of a very modest 77 XJ6C that received that very package, using our parts, some 2+ years ago. It's quite the sleeper. And with many modern features like the close ratio trans and displacement on demand (shutting off up to 4 cylinders under light load), you can also have fairly surprising fuel mileage and the power when you want it. One is making its way into an 88 XJS (Hess) convertible right now and should be very interesting there as well....
Craig- does this maybe give you a reference point as to where the top of your intake will be relative to the hood?
Yes, I think we will be similar fitting, as luckily the mid portion of the XJ bonnet is definitely higher that the XJS bonnet due to its bulbous nature.
The natural lean-back should allow the charger hat to sneak under toward the rear of the bonnet. I have measured a 20mm clearance, but we will see how accurate I get.
We will see in the next few weeks when I get her in the hole!
Have there been any chassis mods or suspension mods to this conversion above?
Does anyone think a hot air intake on a forced induction car is a good idea?
Does anyone else think LSA powers level with such a skinny tire is a good idea?
Does anyone here think the Jaguar emblem in the engine cover is a Nice touch?
I'm noticing a pattern here. Has Andrew figured out how to defy the laws of physics and thermodynamics?
I believe promoting these unbalanced projects as some sort of unqualified example is self-serving and absurd.
Last edited by icsamerica; 12-18-2019 at 08:56 AM.
I guess everyone does not beat their cars as much as ICSAMERICA...I have 410 HP and 470 # torque in my ZZ4/200R S1 with seven inch rims
and this has been installed since 2004. Since that time I have broken NOTHING.... it has good traction and is driven almost daily (except rain
since the wipers in a Jag are their worst component). I have removed the 3:31 LSD and installed 2.88 LSD but for economy sake. Unless you
decide to road/drag race your car the stock rear end components (mine were rebuilt) will work just fine. I do have a cold air intake on my
now fuel injected engine (changed to FAST system a couple of years ago) and agree it lowers the temp to just above ambient.
Last edited by Roger Mabry; 12-18-2019 at 12:55 PM.
I guess everyone does not beat their cars as much as ICSAMERICA...I have 410 HP and 470 # torque in my ZZ4/200R S1 with seven inch rims
and this has been installed since 1997. Since that time I have broken NOTHING.... it has good traction and is driven almost daily (except rain
since the wipers in a Jag are their worst component). I have removed the 3:31 LSD and installed 2.88 LSD but for economy sake. Unless you
decide to road/drag race your car the stock rear end components (mine were rebuilt) will work just fine. I do have a cold air intake on my
now fuel injected engine (changed to FAST system a couple of years ago) and agree it lowers the temp to just above ambient.
Rodger seems like a fine combo, kind'a balanced becasue there is No way a ZZ4 cam 383 is making 410 HP. That's wildly optimistic, more like 365HP on a good day and that's why it works. That cam ZZ4 cam is a tiny 208/221 with low lift, just 1 degree more duration than a stock L98 Corvette cam that would make 240HP on a 350. Sorry you're not getting 160+ more HP from 33 cubic inches with a bolt on EFI setup. It would also be a bit softer that it could be the bottom with all that exhaust duration. That somewhat high exhaust duration is purely for sound effects and would bleed off lots of low end torque. 2.88 gears really dulls the hit too. Fine combo, I'd like it... but it's no LSA not even at the level of an LS2.
Even if it was you kind'a made my point, your reasonable power level is no where near an LSA, you have nice cruiser gears, and you have a nicely fashioned CAI.
Last edited by icsamerica; 12-18-2019 at 10:31 AM.
Rodger seems like a fine combo, kind'a balanced becasue there is No way a ZZ4 cam 383 is making 410 HP. That's wildly optimistic, more like 365HP on a good day and that's why it works. That cam ZZ4 cam is a tiny 208/221 with low lift, just 1 degree more duration than a stock L98 Corvette cam that would make 240HP on a 350. Sorry you're not getting 160+ more HP from 33 cubic inches with a bolt on EFI setup. It would also be a bit softer that it could be the bottom with all that exhaust duration. That somewhat high exhaust duration is purely for sound effects and would bleed off lots of low end torque. 2.88 gears really dulls the hit too. Fine combo, I'd like it... but it's no LSA not even at the level of an LS2.
Even if it was you kind'a made my point, your reasonable power level is no where near an LSA, you have nice cruiser gears, and you have a nicely fashioned CAI.
it was only 5 minutes ago an XJS couldn't handle more than 350 hp.
I guess everyone does not beat their cars as much as ICSAMERICA...I have 410 HP and 470 # torque in my ZZ4/200R S1 with seven inch rims
and this has been installed since 1997. Since that time I have broken NOTHING.... it has good traction and is driven almost daily (except rain
since the wipers in a Jag are their worst component). I have removed the 3:31 LSD and installed 2.88 LSD but for economy sake. Unless you
decide to road/drag race your car the stock rear end components (mine were rebuilt) will work just fine. I do have a cold air intake on my
now fuel injected engine (changed to FAST system a couple of years ago) and agree it lowers the temp to just above ambient.
Roger, It seems you don't actually have the power you thought you had as Icsamerica knows more about your engine than you do.
Roger, It seems you don't actually have the power you thought you had as Icsamerica knows more about your engine than you do.
zero chance a 383 is making more than one horsepower per cubic inch with that tiny Cam and TBI.
410 horsepower is an LS2 with bolt ons. LS2 has the benefit of having one of the greatest intakes Chevy ever made. Coil on plug and sequential fuel injection. As well as heads like the 243 which are
some of the greatest mid lift flowing heads Chevy ever produced.
As for my knowledge., there's a lot you can infer from experience.
Show me anything that would suggest a 383 combo like Rogers would make that sort of horsepower. Those claims are based on absolutely nothing.
I never said I had a stock ZZ4 383.. it has a Comp roller cam, 1.6 rockers, Edelbrock 6090 heads and I have the dyno charts showing the performance. You guys really should investigate things before making caustic comments... The engine was speced to make lots of low end torque...it is easy to make HP/torque if you have a clue how a engine actually works.
The stock ZZ4383/425 street engine made 425 HP and 460 # torque but at higher RPMs...Plus it is in a S1 that is lighter, shorter than the later LWB cars.
Just for the doubting Thomas's, here is one of the dyno pages...
Last edited by Roger Mabry; 12-18-2019 at 01:20 PM.
11-30-2019, 03:55 PM
