I had a little bit of time at work tonight and I know that there is always a "limiting component" with any engine that is holding back power. I know I wasn't going to find much about the Jaguar 5.0L motor specifically, so, in short, I didn't even look. Instead, I started looking at the Mustang 5.0L comments. So, looking at the Coyote 5.0L comments (ie, our engines), they seem to all agree that the limiting component(s) for that motor essentially is the intake (ie, from where it sucks air to just beyond the throttlebody). Seeing what they recommended, they said that the airbox was the first thing that would be fairly inexpensive to modify to get better power numbers (we are not getting major gains, but a few here, a few there helps). Specifically, the hole where the air enters the air box is limiting and causes too much of a restriction. In short, they recommended going with an oil style filter (aka, K&N) and using only the plastic ring from a modified air box to keep the filter in place (good for around 3 hp and 3 ft-lbs of torque gain). LIke I said, nothing spectacular here.

The next thing was the throttlebody. They said that the 80mm throttlebody (assuming our cars have the same throttlebody) was the next restrictive thing (assuming at wide open throttle). There are a few options (82mm, 85mm, 90mm, and a 165mm) when it comes to new throttlebodies. ANyone given one of these a try? Just curious. THinking it might be interesting to see what happens.

The final thing that they mention is the intake itself. WHile there is no "upgraded" Jaguar intake, because this engine is shared with the Ford line of vehicles, couldn't we simply put the "Boss 302" intake on our vehicles? THey do mention that it does take a little bit of reprogramming which from what I can tell is simply reprogramming the air flow since the Boss intake flows better at higher RPMs.

What you guys think? Looking to see what others think and if they see a problem that I seem to be looking past. LIke I mentioned, i am not looking to get monster gains in power. What I am looking to do is to make the motor a bit more efficient and get a little extra umpf in the process.

 

Yours is a supercharged or naturally aspirated?

 

Thermo,

Virtually every car on the market has a sub-following of K&N filter devotees who claim an increase of 'X' horsepower and torque over stock. This is always predicated on the supposed failings of the OEM system. Not one of these claims has ever proven to be accurate. 3 HP or ft.lbs of torque is just too small a % of total numbers to be accurately measured on a dyno as opposed to normal variation and scatter from one 'pull' to another.

Save your money.

 

I find it hard to believe that the intake is a limiting issue as it is the same for all 5L engines up to and including the XJRs 550hp. It would appear that Ford uses a single intake system and throttle body and the XJ uses a dual intake system and throttle body.

 

For the record, I have a naturally aspirated V8.

Like I said, I am not looking for big gains, just little tweaks to help things out. I know from personal experience with my truck that if you can open up the airbox, you can get better throttle response and the truck seemed happier and also had a slight up-tick in the mileage. I am sure there is something that the marketing people won out on to "keep the intake noise to a minimum" that is causing a power drop or to maximize mileage.

I know there is no holy grail for large gains. I would have expected Jaguar to have already taken advantage of those. I am looking to spark a little conversation, see what others have found that helped their engines run a little better to help create a bit of motion here on the boards.

Granted, during this research, there were also lots of posts where guys have the dyno sheets from where they have added various power adders and gotten the N/A motors up into the lower 700 hp range by bolting stuff on (supercharger, headers, tune for the most part). Sounds like it could be an interesting project. Granted, don't see me doing it though.

XJsss, a few of the articles that I read about adding a supercharger to the motor said the same thing with very similar numbers. What they were finding was when they used the basic setup for relatively minimum boost (6.5 psi), they were getting the boost up to around 6,000 RPM, but after that, the boost actually started falling off (down to around 6.0 psi at 7,000 RPM). But, after removing the bottom of the airbox (where the air comes in), they were actually able to get slightly more boost (up to around 7 psi) and it was constant through the whole RPM range. Now, I do give with you that the Mustang uses a single intake where our cars are using a dual intake. So, this drop may not be quite as noticeable.

But, we are still sharing the same throttlebody to my understanding (80mm single blade design). They installed a few different throttlebodies and got minor improvements there too (10-20 hp gains depending on how big of a throttlebody they installed). Granted, getting above the 90 mm throttle body didn't result in significant changes like would expect. Even the people documenting this said the 90mm throttlebody is good for up to 1,000 hp.

 

It's actually the Feds that put noise regulation standards in place- intake and engine noise is high up on their list. Taking a page from the S-type book of experience, the OEM design airbox, filter and inlet ducting cost a grand total of about 1.5 HP when compared to a theoretical 'perfect' system.

 

This has been the pursuit of novices since the automobile was invented over one-hundred years ago. Most end-up spending significant amounts of money for absolutely negligible gains in horsepower, torque, or fuel economy in exchange for things like voiding their OEM warranty, shortening the life of their engine, the catalytic muffler in the exhaust system, drive train components such as the automatic transmission, and polluting the atmosphere their fellow humans and all living creatures depend upon.

 

Since the 5.0L is closely related to the 4.0L, some of the experience is
applicable.

For example, 90mm MAF's have been installed on the 4.0L with claimed
good results.

Air intake has also been discussed in light of installing 3.5 inch ducting.

 

Thermo,

I think you'd be a lot happier if you traded your 2012 XJ 5.0L NA for a 2013-up CPO XJ 5.0L SC. Take the money you planned to spend to upgrade your 2012 and put it towards a 2013. There's a huge difference in the way they drive, not just due to the supercharger (470HP) but because the 8-speed tranny and stop/start that was introduced in 2013. I'm amazed that I get over 16mpg in city driving. Just food for thought.

Stuart

 

Stuart, the start/stop system in the XJ is one of the reasons that I went with a 2012. I experienced it first hand while in London. I found it very unnerving and slightly irritating. People have asked and from what I have been told, it cannot be disabled permanently. You have to disable it every time that you start the car. If I could get the 8 speed tranny and not get the start/stop feature, I would be in heaven. BUt, that is not to be.

As for the upgrades, I use a lot of this to also up my knowledge on how things work, the physics behind why it should or shouldn't work. You wonder why I know some of the things that I do, it is from researching "wild ideas" like this and seeing just how much it would be to do something and if the long term gains may outweigh the costs. Sometimes it is just fun to have something that others don't. That is playing into this one too.

 

With the various intake/airbox/etc changes for the SC version giving almost no gains you're going to get even less with the NA engine. I'd save the money. Either get an SC car or look for gains elsewhere - maybe some sort of sport cat conv? Nitrous/meth would be a likely way to get actual gains.

 

Stop/start can be permanently disabled, you just didn't ask the right people...

 

Interested to see what you come up with.


You know the Ford 5.0L Coyote has nothing in common with the 5.0L Jaguar engine? Yes they are both 5 liters and are DOHC but nothing interchanges between them.
.
.
.

 

Keep in mind that the 5L NA cam system are different from the 5L SC as tha NA engine has dual cam profiles.

 

What he said...

Sell your car, look for a good deal on a SC model.

You'll have a reliable car that will make you smile. That you can take into a repair facility without hassle. That will not lose value because of your mods. And that won't cost more than the mods themselves.

I test drove the Portfolio and was underwhelmed. My SC in dynamic/sport mode (in any combo) is impressive.

 

Don't mess with the size of the throttle body. It has already been optimized for your engine. If you increase the size of the TBs, you "might" gain a little on the top end, but it would probably kill your torque and drivability. Unless of course you are putting in high compression Pistons, Porting the heads, exhaust.. Etc. and then paying big bucks for a custom one off custom tune. 🏇🏿 power

Better off getting an exhaust and pretending it has way more hp.

 

Thermo,

At first, I also found the stop/start system to be annoying. But after driving my 2013 XJ for a while I've gotten used to the stop/start system and actually like it now because I learned that I can choose to activate it (or not) simply by the amount of pressure I apply to the brake pedal. The system doesn't activate unless you step firmly on the pedal; light brake pedal pressure keeps the engine running. When I'm stopped at a traffic light where I know it will be a while before I get the green light, I'll step harder on the brake pedal while stopped to save a little gas. That's probably why I get over 16 mpg in the city.

Stuart

 

That's what I thought. What on earth does the Jaguar AJ133 have to do with the Ford Mustang? Or any Ford product for that matter? Am I missing something?

 

If you've not paid off the car, I would work to pay it off sooner and then use that extra money to buy a toy car: mustang, corvette, miata, etc. Then, you could up-the-horsepower on the toy vehicle. Don't mess with the Jaguar, it's a gentlemen's automobile and it conveys class/style. Get a toy car and mess with it.

 

tbird6, I am curious why the motors do not have interchangeable parts. When I was in London talking with the Jaguar engineers, they were saying that the new 5.0L Jaguar engines are made in the same factory as the Ford 5.0L engines and what happens is there is a room in the back of the factory where the Jaguar specialist comes out and gets to hand pick the blocks and heads that he wants and then those parts go into the Jaguar room and the motors are then built there. I will admit that there are a few Jaguar specific pieces (ie, dual intake setup vs single intake for the Mustang, etc), but I think we will find that 99% of the parts are going to be identical. Hence why I am looking at some potential upgrades.

I know in my car, you remove the cover off of the engine, you see Ford stickers/labels all over the place. I would be interested in hearing what is different with the engine. The only things that I can possibly see being different is the ECU programming, different cam for a different torque curve, and different exhaust manifolds. But, putting on say long tube headers or the like will bolt up to the engine (the question becomes will the headers fit around the body/frame of the car for example).

Looking, "Coyote" is simply the Ford name for the new 5.0L motor. Yes, this new motor has nothing in common with the 5.0L motor from the 90's. But, if you need say a pulley for the front of the engine, that should be identical between say a 2012 XJ and a 2012 Mustang (both having the 5.0L motor).

I am not trying to start any wars here. Just trying to figure out what are the possible options. Like with my X-Type, it shared a lot of parts with the Ford 3.0L motor (there are notable exceptions), but I could find a lot of things for the motor by asking for the parts from the same year Lincoln LS that the parts store said they didn't have for the X-Type. I am one of those "crazies" that still likes to work on my own vehicles and I would hate to have to go to the dealership (which isn't close for me) for each and every part when the same part I need is 2 blocks away at a lower cost.

As I said earlier, I am not looking to insult anyone. I know I am sometimes wrong with what I have found here and there and my logic leaps. But I am also hoping that this might lead to some talk that will also be helpful in the future for someone that is in emergent need of a part.