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Boost pressure plumbing

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bambamjj:
Does anyone know if it is true that you can drill a hole in the plenum chamber (assuming the part of engine next to rockers) on a 300TDI plum in a fitting with a barbed end and connect this directly to the injector pump, the fitting on the top that is connected to diaphram?
See link below

http://forums.lr4x4.com/index.php?showtopic=31

Has anyone done and got photo's

Les Henson:
Plenum chamber is on a V8. Some boost guage kits come with the necessary plumbing to attach it in-line with the boost pipe (a T-piece). You cut the boost pipe, fit the T-piece in line, then run the boost pipe to the guage inside the cab.


Les.

stageonesimmo:
Not strictly true - the plenum chamber is the intake manifold on a 300TDi as well, as it gives the cylinders a stable evenly pressurised volume of air to draw on which is in essance the definition of a plenum chamber in automotive engineering terms. 

Good news is that you dont need to drill it as there is a blanked off drilling already in place at the rear of the plenum nearest the bulkhead - I've moved the waste-gate actuator pipe to this position on mine already  - theres a thread on LRUK forum detailing it and the reasons why, but I can explain it all if you want........

bambamjj:
stageonesimmo, can you explain, if it is the thread i think it is it has no pickies, i need pickies co i is stoopid.

waste gate actuator pipe, that runs from the outlet of the turbo, round back of engine into top of injector pump, right?  the one that looks all bent and about to split in my engine bay but is so solid would have to cut it off to make any changes about 8mm dia.

Your help is appreciated.

stageonesimmo:
Bam,

Sorry mate - I cant do pictures here at work as the MoD wont let me!

Right - the main thing we are after is the boost pressure being sensed at the valves rather than the turbo outlet.  LR have thoughtfully left us a way to do this easily.  At the back of the plenum chamber is a drilling that is blanked off with a threaded plug, this is a standard sized metric pipe fitting and I used the fuel inlet banjo bolt and pipe from a pugeot 104 diesel which I had to hand - its a common size and easily slipped in you pocket at any scrappies yard.  Down at the turbo outlet there is a 'T' piece onto which 2 pipes connect - they are the FIP boost sensing pipe and the waste-gate actuator pipe.  All you need to do is simply fit the new connector (its a 'swan-neck' type banjo bolt that can accept a push on rubber pipe) with suitable copper washers (from whatever you steal the banjo and bolt off?) to the drilling at the plenum.  Then take the pipes off teh 'T' at the turbo , remove the T and get a suiable length of rubber hose to connect the threaded part of the T and the new banjo bolt together - simple as that.

This leaves you with a hole in teh turbo outlet that you can do 2 things with - either, plumb in a boost gauge so you can see your improved boost in action or blank it off and forget it - I used a nromal metric brake bleed nipple as a temporary measure until I could be boithered to fit my gauge.

there job done.

If you really need them, I can take some piccies at the weekend and post them up............

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