This is the main reason I don't like these extra bends in the tubing, as that will alter the airflow over the sensor, although it may be fine (just needs to be checked later via the ltft trims).

Just changing the airfilter box before the MAF by a cone filter already alters the MAF readings.

Dialing the MAF if its within the same tube with a straight tubing and cone filter (for an even laminar flow) wil not have an effect. But having bends before it could change this flow slightly, and there it cerainly could have an effect as you say.

 

For those that aren't familiar with fluid dynamics (air acts as a fluid), this poorly done sketch will explain some of AVos' concerns about the 45 degree bends at the front of my intake. My good drawing program is at my office, so this drawing made at home will have to do!

Air easily compresses and does so against a wall or turn that it encounters. That creates an unusual path that does not necessarily follow the tubing perfectly. Turbulence is created in places where the pressure drops. Turbulence is slower, misguided air. It also acts as a brake, slowing nearby air that is moving more rapidly.

In the drawing, the heavier blue line shows the direction of the higher speed air as it travels through the 2 45 degree bends, leading to the new MAF. The red X indicates the approximate location of its sensor. Now, you can see why there are concerns about how well the MAF will be able to properly measure. There will be some turbulence near the sensor (turbulence is represented by the small semi-circular blue arrows).

The technicians that are performing the engine swap and twin screw supercharger installation are doing an excellent job, but felt uncomfortable making a bigger hole through the fender well's metal. They're kind of like doctors and don't want to harm their patient. =) I will most likely replace the 45 degree bends after the installation is complete since it is my car and I'm OK with having a larger opening for the intake tube.

I have experience with porting and air foil design which helps me to understand the benefits of having a straight section of tubing prior to the MAF.

It is entirely possible that there won't be any kind of problem caused by having the 45 degree bends... and it is entirely possible that a slight increase in performance can be had by replacing them with a straight section.

Here's another way to think about it... imagine that you've got a 100 foot long straight piece of 4" diameter pipe laying on the ground in front of you. There is a 2" thick rope that runs the entire length, inside of it, with a few feet sticking out on the end where you are standing. You reach down, pick up the rope and pull the rope to see how easily it comes out of the pipe. You'll see that the rope comes out with very little effort. Now, imagine that a 45 degree bend has been added to the pipe about half way down its length and the rope is back in place. Now, when you pull the rope out, you have to exert some effort to pull it out, but it will come out without too much trouble. Now pretend that there are a total of 4 45 degree bends in that same 100 foot long pipe and the rope is inside like it was before. You might have to get help from a friend to pull the rope out of the pipe now! Air flowing through an intake system works the same way. The more straight the piping is that leads intake air, the greater the flow, the greater the possible gas mileage and power is.

 

Make sure you remove the rope before you start the car!
just kidding - enjoyed your analogy

 

Great thread ! Keep up the good work you must be close to firing it all up, very interested to hear how it drives.

 

I am insanely busy at work today, but was able to stop by to see the XKR. It runs! The computer only threw one code for the temp sensor. It was a bad one that read too high. A new one is on that seems to be working well. All that is left is to connect the breather hose, bolt on the alarm siren, and a few small last minute things. I *might* be able to take it home tonight, but, realistically, I expect to be able to drive the beastie for the first time tomorrow. This thing sounds far more amazing in person than it does in the video! The supercharger whine is ADDICTIVE.

It lives...

 

Most excellent! Sounds pretty good, so if it is better in person it must be awesome. Hope you get to take it home soon and "try" it out.

More video when you have the chance and thanks for the ride so far.

 

There will definitely be a lot more videos to come. I was just lucky to get the short one posted above. This is a crazy Monday!

 

Lol, Ive noticed on my upgrade to a Kenne Bell from the Eaton that less boost has definitly brought more power over the Eaton, even though I dropped compression a full point too. boost is instant instead of ramping with rpm(those without a boost gauge cant see this) and it is quieter at full tilt and boost, (MY Eaton setup was alot louder that a stock Jaguar) but at idle it has the definite BLOWN supercharger whine, very suttle, unmistakable if you know the sound and not obtrusive that the Eaton just does not have. Ive been driving mine around for a week now and love it. I was alittle off on math though and ordered a smaller pulley to increase boost to the target I built the engine for. Jeff I cant wait for you to drive yours, I know how impressed youre gonna be

 

That sounds great Jeff!
Now we need the first drive report.

 

WOW- I love how crisp the throttle response is and the sounds of the whine.

 

This is sooooo nice!!!
I'm curious about your first driving impressions!

 

Don't leave us in suspense!!! How does it run???

 

Tomorrow morning should be the first test drive. It was important to leave Bill alone as he wrapped things up and made sure that everything had its hose clamp in place, etc.

Actually, now that I think about it...

Bill was just trying to get rid of me so that he could drive it home!!!

Just kidding.

It should be ready to have its break-in drive tomorrow around lunch-time. I'll take it half-way to Phoenix and back for that cruise. I anticipate at least being able to get a video shot of the car doing some acceleration, etc., later in the day that I can post.

WAHOO!

 

I know you must be going crazy waiting. It will be worth the wait.I promise you that.

 

I'm not sleeping tonight!!!

 

Jeff, I have two more payment on my modded (est. 460 chp) 03 STR then will be searching for an 07 XKR. Though I wouldn't mind the Avos TS for the STR, will be focusing the TS for the XKR.

 

AVos offers a great kit. The fact that we had no codes, other than an indication of a faulty temp sensor, shows that he has the electronics sorted out. The CNC modifications that come with the supercharger are awesome as well.

 

Congrats so far with the install!

Remember please take it easy for the 1st 50/100 miles, I know it will be hard, but with the added power you want to make sure all is ok, and the ECU needs to learn the new fuel trims.

 

The half-way trip to Phoenix and back should be around 90 miles or so. It is all highway. I will be able to give the car some short blips of the throttle and some long gradual accelerations. I will also get off of the highway and re-enter a few times to have it experience the range from 0-85 mph at a gradual and moderate pace.

I promise to behave.

 

The fuel trims need different constant speeds, you can either do this with the IDS/WDS (even at stand still), or with driving constant speed at different speeds (usually about 50 to 100 miles normal driving does it). But who am i kidding here, i'll take it you are already on the road ;-)