Since I've got a few maintenance items and upgrades to implement, I figured this would be a good time to redesign the stock intake. The main goal was to delete the resonators and enhance the sound. Any HP gains are a benefit also.

Heres the plan:
- delete and replace air box with long cone type filter
- delete intake ducts behind front grill
- retain OEM MAF tubes
- replace mid tubes and resonators with straight silicone tubing
- cut out and plug upper intake tube resonators

So far I have removed the stock ones:


Cut out the upper resonators:


Plugged them up:


Kidding about the plug above .... just wanted to see how tacky it would look. It seems the hole is 1.75" wide so it shouldn't be to hard to find a plug, then some RTV to seal it. Easy way to cut out the resonators is to heat them up, then take a razor around the edge. I was almost tempted to 3D print an adapter and stick the MAFs in there. But that would be asking for trouble.

Silicone hardware should be in Thursday ...

 

Front grill ducts would be a great place to install OTHER ducting to cool the front brakes.

 

The XKR actually does have naca ducts on the undertray directed at the brakes and Jaguar offers optional additional ducts which continue from that point and go to the knuckles.

 

Are those -year-specific? I'll bet they are.
Any other part numbers at all? I assume those are for your '08.

 

i assume it will enhance the audio a fair amount. that is what i've experienced when swapping straight metal tubing for the plastic stuff and the resonator box on an inline 4 and 6. metal intake runners of the right length sing!

pretty sure that's a myth. on the intake side, the airbox resonator(s) are a specific shape and volume of ready air that's already past the air filter. so air that slammed into a just-closed intake valve and bounced back can dissipate its energy as it propagates into that volume. that maximizes power because it minimizes a force that works against your next intake stroke getting as much air (and fuel) in there as it can. but i don't think you really lose any substantial power when you remove them. and anyway if it really sounds that much better and it only costs 5-10% of HP maybe it's a good trade if you value that sound. that's why i'm happy to give up low end torque for my exhaust tinkering, after all.

 

Yes sound is improved but a 10% HP loss in NOT a small number. There have been numerous debates on the merits or lack of changing intakes and whether the Helmholtz resonators are for acoustic or air volume control across many marques, not just Jaguars. I can tell you however in my case, airflow improvement was confirmed via a meter compared to the stock intakes.

 

No, they are actually for the X152 but since the X150 and the X152 use the same lower control arms, they fit both.

 

well yes but paying it as a price for something else you can get is entirely subjective.


see now that's interesting. that suggests the stock configuration is already paying that price only to have the car sound worse anyway! i don't like pod filters but i might consider some modifications there.

in the cases where i did modifications before, there were no helmholtz-style resonators, just baffled expansion boxes behind the filter box. i didn't think helmholtz resonators restricted airflow though.

 

Thanks @jahummer !
I didn’t know about C2Z29960... I suppose I should be paying attention to the similarities between X150 and X152, especially as she’s becoming “more mature”. (Incidentally, I’m not)

 

This isn't a track car so brake cooling isn't really a concern.

Now that I've read into it more, I realize I will probably lose some HP. There is no large, open intake manifold to help dissipate any of that energy. But I figured an exhaust upgrade and tune coupled with the smaller S/C pulley already on there should give me back some HP. Like I said the goal is a better sound.

Not much progress except some rubber sink drain plugs are the only things that seem to fit very flush inside the duct...

 

If you are deleting the resonators, try putting in an X crossover pipe. I did and it improved the sound. Also,
K&Ns and ECM preprogram. Noticeable increase in performance.

 

You are however measuring with the new cones , so how can you tell that the piping added the flow and not the cones? On my setups piping is still stock but oem paper cones and airflow seems to have improved 8% or so, but then there is always potential for turbulent air to cause different readings with aftermarket setup. If I had a set of aftermarket tubes/pipes to test I could tell you exact difference that have been made via sdd jlr , by monitoring each maf bank separately. Recently tested a colapsable pipe in place of the stock squeezed tube area and found out it flowed less than stock.
Photo of my current oem type paper filter cones

 

If you want to fill it flush,maybe use expendible foam and cut it flush ?

 

I've used a billion gallons of Expando-Foam in my life. It works REALLY well....... in specific situations. It does not like heat/cool cycles, nor UV rays, nor high velocity air.
Also, it tends to crumble after awhile, especially under the before-mentioned conditions. Crumble/dusty mess is what it turns into, so I'd not advise having anything which deteriorates in the intake system.

 

I didn’t really specify what created the flow improvement other than full custom intakes which would include new cone filters with a greater media area than stock ones.

As for clearance to the throttle body, it can be resolved by dropping the powertrain about 3 inches, plenty room then.

 

Did you happen to measure if tubing made the difference or have mistakenly thought you also replaced those?

 

I removed the snorkles, exchanged the air boxes for non-oiled K&N cones and replaced the resonated tubing with custom welded aluminum. The MAF housings were retained and attached with Vibrant silicone tubing.

 

so all pipes from t at throttle are replaced ?Do you have sdd JLR? There is an easy way to test with jlr if pipes offer aditional flow or of they flow less than stock.

 

I'd love to measure the actual flow at each MAF but can't do it with my current tools. The best I can do is get the total (i think) flow rate and absolute pressure. 5.9 g/s @ 1400 RPM with 20 kPA manifold pressure. Does that sound like its from 1 MAF or combined? Mass flow rates add together in a control volume.

I do have readings from an entire trip with the stock setup, so I'll throw up some before @ after charts after I test out the new setup.

Right now I'm working out the hanger/bracket fitment and trying to see if the wheel arch liner will go back in without pushing up against the intakes. I had an old X-Type MAF tube laying around, from when I put an intake in that car. Good thing I saved it, its the same MAF fit and 3" OD on both ends. The XKR MAF tube has that 1 large end that doesn't really work too well with this setup (hats off to Jahummer for making it work). So I bought another one from ebay and cut it off. Heres a mockup so far:




Also, the upper silicone end is a bit wider than the stock intake tube, where they mate. I can clamp it tight but don't want to risk a leak downstream of the MAFs. Still looking for the best way to resolve this... few layers of electrical tape?

 

They do sell MAF intake tubes at the store but I didn't want to bother with adapters and different diameters.