Vehicle & Technical > Discovery

Boost pressure plumbing

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Porny:

--- Quote from: chris.hunt22 on June 29, 2008, 10:03:29 ---I have plumbed my gauge into a tapped fitting in the plenum chamber, my gauge at full toot is reading about 0.6 - 0.7 bar, I have read in my Haynes manual that 300 tdi will boost from 0.7 - 1.0 bar but where is this reading taken from, I don't want to crack the actuator up to 1 bar and get a loud bang one day!!!!

--- End quote ---

Land Rove state 1 bar (14.7psi) at the actuator (i.e. Tee'd into the pipe from the compressor housing to the actuator) however, 1 bar at the inlet manifold will be fine. I've known 300Tdi's run 17-18psi without a problem

A 200Tdi as standard is 0.8bar at the actuator.... A 200Tdi will happily run 1 bar or 14.7psi all day long (and even a bit more if you want)

You will get a spike above what you actually want on both 200tdi and 300tdi (the actuator can not control the spike), it is the pressure that the actuator holds after the spike you are interested in.

Anything above about 17psi is not worthwhile as the turbo become inefficient.


Ian

Snake110:
thanks for that porny just what i needed to know .. :clap:


right lads the head gaskets are on porny :lol: :lol: :lol:

bilge rat:
am i getting this right , basicaly you take the t off at the turbo end  and the threaded part you have removed from the turbo you run a peice of pipe straight to the plenumn and then you block the hole in the turbo outlet ?. anyone got any pics or anything .cheers alan...

smith335:
Any body got any pics of this mod?
and allso any pics of this blanked of threaded hole in the plenum ? cant find it!!

thanks in advanvce

Range Rover Blues:

--- Quote from: stageonesimmo on June 22, 2008, 23:47:47 --- It may not seem like much but it made a hell of a difference to mine!  I was losing nigh on 0.25 bar through the pipes and cooler meaning that I could only ever expect to get 0.75 bar at the valves - now that the waste-gate opens when the correct pressure is reached at the valves I'm getting the full works all the time.

--- End quote ---

And you don't think the engine designers took this into account at any point?

The quoted pressure of 0.7 to 1 bar is at the turbo outlet, if you are registering a pressure difference at the plenum then effectively you have "wound the turbo up".

If the intercooler became blocked the pressure at the turbo will rise uncontrolably.

The only advantage I can see is the the fuel pump would not increase the fuel rate quite as quickly and you wouldn't get the puff of black smoke that will result.  However you could connect the fuel pump to the plenum and leave the turbo alone.  I'd considered doing this before our TDi took up residence in the bodyshop.

If you want an effective turbo tweak then fit a boost regulator, one big advantage is that they eliminate waste gate creep ie the waste gate stays fully shut until the set pressure is reached rather than opening progressively as the set pressure is near.  Again you are raising the boost above the "designed" level though but not altering the peak boost (unless you want to).

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