300tdi's with boost gauge fitted

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Originally Posted by Blknight.aus

urmmm.....

putting the boost pressure sense on the turbo side of the intercooler tricks the boost compensator into thinking that its got more air to play with than it really has. This lets it inject more fuel which then raises the EGT's without giving you more boost.

its a lot more complicated balancing act than that but at the end of the day for optimal preformance and longevity the compensator needs to know whats going into the cylinders not whats coming out of the turbo..

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Quote:

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Originally Posted by LOVEMYRANGIE

2nd that one!

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:angel: :angel:
You guys should check the stock 300Tdi arrangement.

Both the line to the wastegate actuator and the line to the boost compensator on the injection pump pick up the pressure signal from a tee piece on the outlet of the compressor.

There are no lines from engine side of the intercooler on a stock 300Tdi.

Just a follow up to this rather old thread ...

I purchased a 30PSI VDO boost gauge and plumbed it into the inlet manifold where the metric plug is at the back. Pirtek sell metric fittings and tapped a new brass plug to NPT to accept the supplied VDO fitting kit.

I'm seeing boost peak momentarily to about 16PSI on the inlet manifold before settling back to about 14PSI at full boost. I was expecting a bit more loss across the IC and am pleasantly surprised. I don't believe the boost has ever been wound up at the turbo. I have a slightly thicker JASE IC on the 300Tdi.

Hi

Just read your now old post re fitting a boost gauge. You mention buying a brass plug from Pirtek. Can you recall the size of the plug? Any detail that will help me track one down would be appreciated.

Regards

Found the receipt for my fittings.
Got them from Queensland diesel spares. (Truck spare parts place)
They were on the shelf in small blister packs.
21-327M1202- 12mm x 1/8" BSP Reducing Nipple
21-011001- 1/8" Tube x 1/8" BSP Female connector

1/8" is the hose size on my boost gauge.
12mm is the thread size on the intake plenum, thread pitch unknown.

Fantastic. Thanks for that. The plug is not easy to get at so didn't fancy having to take it out and put it back more than once!