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I have discovered the culprit of surging problems that I had that were raised in another thread. I thought I would share this with everyone because the problem exists before you actually have surging or other issues.
The problem is the design defect. Jaguar uses a plastic intake that leads to the Plenum on the X JR. That intake has another piece of plastic held in place by eight he said attached to it. Over time this adhesive decays and rots. Thanks to the powerful vacuum that rotting adhesive is sucked into the engine which cannot be good for the rings or cylinder walls.
Similarly, the hose that connects from the air flow meter to this plastic Plenum is connected to the plastic Plenum by adhesive and as you might have guessed it to can decay. Because of the way the hose aligns even when it is no longer airtight it looks like it's properly in place but if you examine it closely you may find there are gaps for it is completely disconnected.
These are two points where in air can get into the system bypassing the air flow meter. They're
also two points where driving he said can't get into the engine. I'm going to see if there's a cold air intake style tubing available for this in order to bypass this plastic garbage the Jaguar put in the car.
No welding involved with mine which is the same diameter as the stock intake whereas Caldoofy's is larger.
I would argue that even if you have a larger diameter intake pipe the restriction on the fixed diameter of the elbow under the throttle body is the limiting factor.
No welding involved with mine which is the same diameter as the stock intake whereas Caldoofy's is larger.
I would argue that even if you have a larger diameter intake pipe the restriction on the fixed diameter of the elbow under the throttle body is the limiting factor.
Thanks! Do you have more of the one you made? I really want something I can put in without having to modify/weld/cut.
I only made the one. It is very simple to do however I ordered the Aluminum pipe from China on Ebay and so it took about 3 weeks to get it.
Someone else did the same after seeing my setup only to have the pipe arrive damaged.
The only "tricky" bit is to drill the correct size hole to take the low load breather pipe as that needs to be a tight press connection.
On mine you see an oil catch can in that low load breather pipe. Not worth putting a catch can in that pipe as opposed the high load breather pipe
that is well worth putting in an oil catch can.
The above is a listing on Ebay for a US based supplier. The pipe will have to be cut to length and I used a circular clamp around the pipe to get a perfectly placed hacksaw cut.
One important change I should mention is that I used a Norma Connector (Ebay Free Ship, 4 Count, Norma RSS PA6-GF30 Connector, See pics for dimensions) to connect tubing for the low load breather to the Aluminum pipe. I used 0.25" silicone vacuum hosing for the pipe.
Just to be clear. I modified the original low load breather tubing. I kept the connector at the engine end and took off the original piping to replace with a flexible pipe going to the connector
inserted into the Aluminum pipe.I did that because I could not find a connector suitable for the original hose/pipe which needed to be connected to the aluminum pipe.
07-30-2018, 01:29 PM
Xjr design defect intake plastic!
