XJ ( X351 ) 2009 - 2019

‘Downgrading’ to a non SC 5L XJ

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Old Oct 29, 2023 | 07:56 PM
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Default ‘Downgrading’ to a non SC 5L XJ

Ok - I have the opportunity to buy a 2011 with a blown SC engine.

Rather than put another SC engine, would it be possible to install a 5L non SC motor?

Yes, it would be a ‘downgrade’, but non SC motors are much cheaper and easier to come by.

Has anyone done this?

Thank you for any insight you can provide!

Scott
 
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Old Oct 29, 2023 | 11:41 PM
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Is it possible to keep the supercharger from the blown engine, and add it onto the non-SC one?
 
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Old Oct 29, 2023 | 11:59 PM
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Originally Posted by Meanmugga
Is it possible to keep the supercharger from the blown engine, and add it onto the non-SC one?
Nup.
This question - "can I turn my AJ133 NA into an SC version?" - has been asked eleventy million times and the short answer is "no, not without spending yuge amounts, way more than it would cost you to trade your NA car for an SC car". Fact is I doubt very much anyone has ever done it, I have never read or heard of it being done successfully.
 
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Old Oct 30, 2023 | 04:45 AM
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Originally Posted by OzXFR
Nup.
This question - "can I turn my AJ133 NA into an SC version?" - has been asked eleventy million times and the short answer is "no, not without spending yuge amounts, way more than it would cost you to trade your NA car for an SC car". Fact is I doubt very much anyone has ever done it, I have never read or heard of it being done successfully.
Correct - I do not want to do that. My question is can I replace the SC engine with a much cheaper NA engine. I don’t want to put the SC on the NA engine. I can find NA engines readily. I potentially have the chance to get a SC car (with a blown engine) cheap. No SC when it’s done.
 
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Old Oct 30, 2023 | 06:31 AM
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Originally Posted by OzXFR
Nup.
This question - "can I turn my AJ133 NA into an SC version?" - has been asked eleventy million times and the short answer is "no, not without spending yuge amounts, way more than it would cost you to trade your NA car for an SC car". Fact is I doubt very much anyone has ever done it, I have never read or heard of it being done successfully.
Just to give another angle:

The car would have SC badges, but have a standard NA motor. The motor would not have any SC on it or anything. It would be just an NA motor. The only thing SC about the car would be the badges.
 
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Old Oct 30, 2023 | 11:38 AM
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Notwise: Its not just only an engine swap. You have to swap quite high amount of eletronics as well, since SC have sensors/actuators what NA do not have and NA have sensors/actuators SC don´t have. If eletronics don´t get reply from these sensors/acuators after engine swap: You will get engine manulfuction light and restricted performance. NA engine will have sensors/actuators what your wiring loom dont have connectors and your electronics cant read/control.
Modern vehicles (all of them, not just jag) are far beyond that point that you could just swap the engine from one type to another, like "old days".
There was one fellow here in this forum who change +2013 engine to pre-2013 vehicle, and that was huge work. (elecrtonics changed from Denso to Bosch)
 
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Old Oct 30, 2023 | 12:14 PM
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Please listen to Vasara!
This is an extremely complicated swap and not worth doing. If it can even be done?
You got the car cheap for a reason? It won't be cheap to fix it and if your not planning on a DIY repair I would get rid of the car now.
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.
.
 
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Old Oct 30, 2023 | 02:50 PM
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it would be cheaper to convert it to an EV lol
 
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Old Oct 31, 2023 | 10:31 AM
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Originally Posted by clubairth1
Please listen to Vasara!
This is an extremely complicated swap and not worth doing. If it can even be done?
You got the car cheap for a reason? It won't be cheap to fix it and if your not planning on a DIY repair I would get rid of the car now.
.
.
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Thanks for the great insights everyone. I've decided against buying the car as it seems like a true ordeal to change it out.
 
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Old Oct 31, 2023 | 12:24 PM
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It could be a great project if you put the SC 5.0L back in it?
It would be a whole lot easier to.
.
.
.
 
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Old Oct 31, 2023 | 12:44 PM
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Originally Posted by notwise
Thanks for the great insights everyone. I've decided against buying the car as it seems like a true ordeal to change it out.
notwise, that was very wise of you.
 
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Old Feb 9, 2025 | 02:38 PM
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Originally Posted by notwise
Ok - I have the opportunity to buy a 2011 with a blown SC engine.

Rather than put another SC engine, would it be possible to install a 5L non SC motor?

Yes, it would be a ‘downgrade’, but non SC motors are much cheaper and easier to come by.

Has anyone done this?

Thank you for any insight you can provide!

Scott
I guess you could but you would need to at least de tune the ecu to run the new engine as the air fuel mix will be different if you wanted to you could even go as far as throwing a rotex charger on there just to give it an extra kick
 
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Old Feb 9, 2025 | 03:45 PM
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My man is going back in time here..LOL
 
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Old Feb 9, 2025 | 04:31 PM
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Originally Posted by SuperChargedXJR
My man is going back in time here..LOL
Yup missed that one by a little time I'm thinking lol my x351 is the xjr575 running the zf8 box pulls like a demon spoke to the head engineer after emailing a query really nice chap just to get advice more than anything he recommended keeping it to no more than 650 as they did with their stealth 666 SUV same engine but they were encountering a lot more wear on the diff and the gearbox on the stock internals so to lower production cost redesigning the rubbing gear to be able to take the enormous amount of torque adding over the stock limits of power which is what dodge do with the hellcat same set up just a different power plant even on the red eye and that monster with over 800 bhp as do Aston Martin and Bentley
 
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