XJ XJ6 / XJR6 ( X300 ) 1995-1997


Old 06-05-2019, 11:45 PM
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Hey everyone I知 new here my name is Lvontay nice to meet y誕ll. I have 95 xj6 and i知 thinking swapping the i6 for an i6 2jz is it something I should go for, or is it a bad idea?
Old 06-06-2019, 12:14 AM
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Originally Posted by lvontay Munson View Post
Hey everyone I’m new here my name is Lvontay nice to meet y’all. I have 95 xj6 and i’m thinking swapping the i6 for an i6 2jz is it something I should go for, or is it a bad idea?
Hi Lvontay,

Welcome to the Jaguar Forums! It's great to have you with us.

The stock AJ16 engine produced around 240 hp when new, which is more than a standard Toyota 2JZ-GE (210-230 hp).

The U.S. version of the twin-turbo 2JZ-GTE was rated at 321 hp, but the supercharged AJ16S engine in the Jaguar XJR was rated at 322 hp, so you could save yourself lots and lots of trouble by finding and purchasing an XJR.

Installing a 2JZ-GTE in an XJ6 would require overcoming many challenges, not the least of which would be the integration of engine and transmission management. The vehicle speed signal comes from the ABS Module, and the ZF 4HP24 is electronically controlled and requires the ECM, TCM and ABS Module to work together to orchestrate smooth gearshifts. Installing the transmission from a Supra or GS300 might be possible but would no doubt present many additional challenges.

Another issue is that the 2JZ used a cast iron block, while the AJ16 used aluminum, so you would probably be adding front-end weight.

On the other hand, the 2JZ-GTE has proven to be tunable to insane hp levels, in part due to its iron block.

So how much time and money do you want to spend?



Last edited by Don B; 06-07-2019 at 09:30 PM.
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Old 06-06-2019, 07:59 AM
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Originally Posted by lvontay Munson View Post
...i知 thinking swapping the i6 for an i6 2jz is it something I should go for, or is it a bad idea?
Welcome to the forum, Ivontay. Don speaks truth. I'll make it simpler: It's a bad idea.
The AJ-16 has proven mostly bulletproof. If, by some chance, there is something horribly wrong with yours, a good idea would be find another naturally aspirated AJ-16 from a breaker and install that one. Take careful note of Don's advice that if you desire horsepower in the 300+ range, "find and purchase an XJR." See? He most definitely did NOT say find a supercharged AJ16 out of an XJR and swap it in. There's a lot to be learnt in what Don didn't say.....I'm just sayin'....and that learning could then be well-applied to the concept of swapping in an engine that is NOT as similar to the AJ-16 as the supercharged AJ-16 is, which should bring you back to the end of my welcome statement, above.

However, some like a physical and technical challenge, often created by the parts and materials they have on-hand. If you are bound-and-determined, have at it and keep us posted with pictures and descriptions. Many here will follow with interest.
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Old 06-06-2019, 10:02 AM
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I'm no engineer or electrician but in the late 2000's my brother was working on a manually converted XJR (He did all the mechanical work himself and since technology has progressed has been talking about a turbocharged X300, but that's a different thread) but honestly it sounds like your best bet for more power is to just, well, find an XJR. If you have access to all the tooling to build your own custom mounts and everything else, that would make things a lot cheaper but you will still be running into some very complicated tuning issues. The new AEM Infinity suites are pretty amazing at what they can do, but it's still going to require a lot of work to get it running. I'm no mechanical purist by any means, whatever works, well, works. As neat as I think it could be, this sounds like a 5+ digit build, and not low fives either. However, if you have access to all of the above like Don said, then it would be pretty cool to see an alternative option.
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