Hi all, I am a new member but have been reading for over a year. I have a 1996 XJ6 and want to build a custom intake for it. I have Andy's bracket on the way and want to put the finishing touches on the upgrade.

I have searched the forum up and down but haven't seen a definitive guide yet members have stated they have made some custom setups.

Can I request we make this a custom air intake sharing thread with pictures and ingredients to cook up a peppier kitty?

 

Diameter inlet 115 mm. After the elbow piece go from 115 mm. with fitting to 83 mm.

 

Sweet! Where did you get the parts? Home Depot or Lowes or other? Also where did you get the filter?

 

The parts, ADPE(High Desity PolyEthylene) pipe and fittings. The filter is a universal K&N cone filter

 

Great thank you. A couple more questions:

Did you cut the pipe before the MAF?

What did you do with the air injection hose at bottom of stock box?

 

The pipe with the MAF in is original and not cut off. I have the box removed.

My X300 has no air injection, is from 1995. But you can make a small filter to this hose.

 

For the end of the air injection do you mean like a breather filter?

Also is that a solid piece mounted to the MAF? Mine has some raised "ribs" if you will, how did you ensure a tight seal?

Thank you!

 

I also went to Home Depot and the closest they have is 4" & 3". Where could I go to get HDPE in these sizes in the USA?

 

For the end of the air injection I mean a breather filter.

I don't know where you can buy this in the USA.

With a piece of rubber tape there between can you get it right sealing

 

I would recommend adding a partition to avoid the air filter "breathin hot air from the engine bay.

 

Thanks. That is why I have placed the filter as far as possible from the engine. Gets a lot of wind through space at the headlights.

 

what did you do with air injection hose? the one that goes into bottom of stock air box...

 

UK spec cars didn't have air injection for 95 or 96MY.

 

Where you get that Metal farm around the filter?

 

I had read somewhere (Jag Lovers?) where some testing showed that a good option was to increase the stock "snorkel" on the stock airbox with a larger smooth hose and eliminate the "trumpet" restrictive shape of the OEM part.

I think there also was a post somewhere that suggested adding a second hose/snorkel to the stock airbox and routing both to cooler air forward of the relays and perhaps into the fender were good solutions.

Although I really like the look of the cylindrical filter and custom heat shield above, the options mentioned above would maintain the stock look while negating any need to fabricate a heat shield to overcome engine compartment heat (HAI = hot air intake)

Interestingly I have "pod filters" and "velocity stacks" on my Moto Guzzi, but several years of testing have shown that the stock airbox actually produced more HP/torque!

Here are some interesting videos on the subject, perhaps not authoritative, but interesting none-the-less:





There are also have been some observations here that suggest the oiled cotton gauze filters (e.g. K&N) aren't a good fit for the XJ air flow sensor as it uses a "hot wire" sensor that the oil fouls. This has been reported on other cars of a similar mass air flow sensor design with oiled filters.

K&N however disputes this: K&N Mass Air Flow Testing Findings



With all of that in mind, I plan to modify my stock airbox with two smooth intake tubes routed to some cooler air, and maintain use of the paper filter.

.

 

Interesting videos Al, and I will be interested to hear how you get on. I have a feeling that if any worthwhile gains were available, Jaguar would have availed themselves of them. In anticipation of the usual comments about Jaguar penny pinching, I can't help but feel that the cost of any extension to the airbox at the point of design would have been negligible, and would not have stood in the way of additional horsepower had it been available. And of course the more the intake is exposed to the airflow, the greater the prospect of ingestion of everything else in the airflow, most particularly water.

 

Yep, all valid points, and often what most people point out overall about all this intake fiddling

Although the video above in the very specific case of that car with that airbox on a NA car did show a gain. The others of course did not.

I still plan to add a little more intake capacity to the stock airbox though. I won't have an opportunity to dyno the car at all, much less before/after under controlled variables.... so ultimately no matter what I observe subjectively, it won't be reliable other than my "butt dyno"

But that's usually the case with these things right?

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If nothing else you might end up with a very satisfying snarling sound....as Jaguar (as usual) made things a wee bit too silent.

The XJR system varies from the standard XJ6 system only in the diameter of the intake tube. I mention this only because you might wanna keep the original system intact and buy a cheap used XJ6 air filter box to modify and experiment with

Cheers
DD

 

Yep, already ahead of you I have a salvage XJ6 box and snorkel I'll modify if I go down this route.

I am one of those guys that keeps any original OEM parts in a bin in case I ever want to put it back stock.

.

 

Here's mine, fitted today after I accidentally left a hammer on the factory air box (with k&n panel in) and shut the bonnet breaking the lid