Great thread!

Post up more pictures when you get that differential installed.

 

I certainly will. =)

I got the car back from the techs yesterday. They had found that the old original coils weren't up to the task, a couple had cracks, and sparks were 'jumping the gap' all over the place. They have now installed a brand new set of 8 coil packs and all new plugs. They gapped the plugs a little closer than the stock setting to make it easier for the coils to do their job.

At first, though running smoothly, it seemed that the power was way down after I picked it up from them. They probably did a computer reset while it was there and it needed to catch up. By the time I drove this beast to my factory after dropping kids off at school, etc., the beastly amount of power was back.

It is so easy to see a gap in traffic and use it. You just have to be respectful of other drivers since they don't know the power level that you've got. If I wanted to be a jerk, I could almost pull out in front of anybody at any time and nail it, getting up to speed with traffic almost instantly. Of course, if something broke, preventing me from getting up to speed, things would become uncomfortable really quickly.

I respect the level of danger that I can get into with this car... and don't push it to its limit all the time and everywhere I go. It's almost as much fun just 'knowing' that you've got that much power on tap, not even needing to use it.

 

Almost like the feeling of walking through a town in the old west with a big loaded .44

 

In AZ that analogy is a little too true. We can open carry a .44 magnum, or anything else for that matter.

 

Here, in Tucson, Arizona, we don't need permits to carry concealed or open. I also own a gun holster manufacturing company. Haaaah! I carry open frequently with my Glock 19 on my side. I also train in a handgun martial arts class.

If a policeman is too heavy for you to carry around you need to have your own way to defend yourself... especially in the industrial park where my factory is... at night...

Uh, oh, I'd better turn this thread back around. =)

I meet with Vettegood this Friday to install the modified airbox that I used to have. It should give him some extra power in the higher RPM range. It will be nice to meet him!

 

gun holsters, we need to talk, I might even own one of yours, LOL

 

We installed the high performance intake that I used to have on the original 4.0 engine that was in my car into Vettegood's XKR. We did notice a worthwhile power gain after putting it on. Mitch took me out for a burger and a beer and I let him drive the twin screw Jag. It was a really fun afternoon.

The paint and interior of his car are incredible.

I also straightened out the intake that was at the front of my car. I like how it routes now and is just like what AVos prescribes for cars with his twin screw kit.

 

I was kind of tired and in a hurry when I posted the pictures above. AVos noticed that the hole in the photo wasn't quite right and pointed out to me that the hole should be cut open more toward the rear of the headlight. He said that with the hole cut, as shown in this photo, the filter would be up against the inner plastic fender lining, limiting its access to air. He was right! I accidentally posted a photo from when I was test fitting the parts, and that is exactly what was going on.

This is the correct photo that shows the intake installed with a straight section after the MAF, leading to the cone filter that is behind the front bumper:



The air filter now nicely clears obstructions and the plastic inner fender lining is in its proper position. It is important to retain the removable access panel, keeping it properly installed, to prevent rain from getting onto the cone filter. You do NOT want to pull water into your engine.

Now I need to close the access hole where the original air box had pulled air in. I'll use a section of plastic.

 

Please note to all, I have received very little to almost no questions at all from Jeff and his installer, so kudos of course to them for installing all very well. That is the main reason why I was looking as well to Jeff’s thread/pictures to see the progress and if I could help in any way somewhere.

Sorry, but there is one more thing I have to say about what I see.

That round thing (from the 4.2 engine, don’t know how it’s called, so will name it round thing from now) you have used on the engine breather might (I say might, not will) work against you.

The 4.2 setup is different than the 4.0 engine, there from the round thing it goes into the intake elbow (vacuum side), and the other side of the engine is going to the intake pipe (between maf and TB). So you see it is the other way around as on the 4.0 cars.

Have just checked the operation of that thing (to be sure you can use it), and when you idle/cruise the airflow will go from the intake pipe into the round thing, and on the other side of the engine it will go into the intake elbow as there you have a vacuum.

Now when there is a slight resistance in airflow (in the part between the intake end round thing), the round thing will close, and your engine will be sucked vacuum, which I don’t think is ok.

You can check it yourself, take it off and suck air from the side that goes into the camcover, and hold your finger on the other side; you’ll notice that at some point the unit will close/block airflow. It did require some resistance and it goes open again if the vacuum goes away, and although I think the chance is small it will ever occur, why risk it.

 

WOW, is about all I can say.

Friday I drove to Tucson to meet Jeff for the first time, although with his great threads and descriptions felt like I already new him.

First let me say Jeff is a Good Guy, Knowledgeable, easy going, good sense of humor and passionate. Very easy to get to know.

Now, the Avos Twin Screw,
WOW, it sets you right back into the seat, while the exhaust sound is a bit louder it sounds like power and aggressiveness being harnessed by a Jaguar XKR.
It is quite exhilarating and almost scary, as I thought the whole engine could blow any second, Jeff assured me that was not happening. I am not familiar with such power!

I will say that I am now proficient with a 'Butt Dyno" I hope there is no residual residue, it's a learning curve you know! !
All in all, I was quite impressed with his engine modifications.
The mods are quite esthetically pleasing, well placed and look very comfortable in Jeff's XKR engine bay.
Although I must say the tires are most likely feeling worn out, over used and a bit smoked... But he has new ones coming and will put these out to pasture for retirement soon. Jeff is not a cruel XKR owner. Just expects a lot!

I also want to thank Jeff for his time, energy and modified air intake box ( the "El Toro" for those that remember his thread) that doubles the amount of cool air into the engine.
I do believe it has given the XKR some extra power, I know this because when I first drove to Tucson the windshield bugs were 1/16th to 1/8th inch splattered and when I drove home they were ¼ to ½ inch splattered (is that a word?).

Anyway's, it was all good fun and quite enjoyable, I will be waiting for the new differential, Blue tops, tires & wheels and other mods to come. I will drive down for another episode and report back.

It would seem as though there are enough Jaguar forum members in Arizona that we should all try to meet up, I'm not sure about me, but Jeff is definitely worth meeting. I think it would be worth everyones time and effort. Any takers or joiners out there?

I'm out to wash the car now. Enjoy the 90 degree weekend...

Happy and safe Motoring to all...

 

Thanks for mentioning the round thing, AVos. That is something that the techs put into place. It seemed to me that it just needed a tube. I will remove that and just use the tube/hose.

The main reason that the techs did not need to contact AVos is because the instructions are pretty thorough. AVos also has been great with his commentary, just like what he did above. =)

 

I removed the round breather gizmo and installed a tube:



Also, 3 of the 4 Perseus wheels have arrived! I don't know why UPS split the shipment up. They delivered 2 on Thurs and 1 on Friday. Monday should have us seeing the 4th. I got these cool wheels from JgaXkr. These should work out well.

 

The round thing is a check valve. The 4.2 setup has the check valve on the right side connected to the intake elbow and the left side connected before the throttle body to breath in fresh, metered air.

So, if your twin screw setup now has the right side going to the intake elbow (vacuum) you probably do want the check valve in there.

 

Jeff has the normal 4.0 setup, so the check valve should be removed (as he already did).

 

Today, I was heading up the mountain in the XKR (part way up, approximately 4500 ft. of elevation and quite steep) when a young guy in a suped-up newer Camaro approached at speed behind me. I could tell that he kept thinking that when the car in front of me pulled over into a parking spot, that he'd try to hurry around me to gain access to the clear road ahead. HAH!

The car in front of me did take advantage of a pullout to let us go by, then I hit the gas. I could see the Camaro driver making an effort to keep up, but he couldn't. Ah, that was awesome. He stopped trying to drive too close to my car's rear and we had fun hitting the accelerator multiple times when there were safe sections of road with no bicyclists, etc. Each time, it was fun to see that bright red Camaro with its high-rise hood get smaller and smaller in my rear-view mirror. I could tell that his day had not gone as planned. =)

The driving experience with this twin screw supercharger is incredible... and worth every penny and minute to install.

Jeff in Tucson

 

Jeff I know the feeling, I had someone with a Z006 Corvette wondering why I was able to stay right on his bumper.

 

I envy You that feeling.. leaving a muscle car behind...

I will get that feature and feeling some time in a reasonable future.

/Jan

 

With the water/methanol injection system, I had kept the injector from when the car had its original 4.0 engine with stock supercharger. It had an injector that was claimed to be for cars to 500hp.

The power has been amazing.

About an hour ago I installed a new injector that is for cars to 600hp.

HOLY COW!

It has already been over 100 degrees F in Tucson, Arizona where I drive at 2500 ft. of elevation. Water/methanol injection helps any car here, even normally aspirated engines.

I thought that I knew what fast was! I took the XKR for a rip down the boulevard with its new injector installed and thought that I had hit a nitrous button the size of a dinner plate. HOLY MOTHER OF TOLEDO! I felt the skin on my face pull backward as I eerily sunk back in the seat. Even in third gear, if you floor it, there is so much power that the rear end squats all the way down, as in the shocks almost bottom out... as in you're almost looking at the sky as the front end points upward and the twin screw supercharger SCREAMS bloody hell and the tires SHRED the pavement.




OH




MY



GAAAAAAWD.

 

You're killin' me Jeff !!

 

I may have to give up my plans to twin screw my XJR and just go buy an XKR and follow you lead. I'm getting a serious case of envy Jeff.