Boost Pressure

HowiePage · May 28, 2014

Hi,

Sorry in advance if this has been asked multiple times before, but i did a search and didn't come up with an answer. Just installed a Tim's boost gauge (upto 2 bar) on my defender 90 300tdi. I fitted it by removing the handy bolt on the back of the manifold and replaced with a banjo with the pipe to guage attached there. Took out for a drive and the Max boost it read was 0.5 bar which seems a little low? Is this correct? and what would the likely causes be?

Thanks
Howard

SteNova · May 28, 2014

Pics of the bolt you removed?

Kwakerman · May 28, 2014

Pressure should be 1 Bar at the turbo waste gate 'T' connector, check it is correct at that location first. if it is good/close there then you may have a boost leak after the turbo (pipes/intercooler/clamps). Pressure will always be a bit lower at the manifold due to restrictions in pipework / cooler.

trax · May 28, 2014

SteNova said:
Pics of the bolt you removed?

should be this one

trax · May 28, 2014

HowiePage said:
Hi,

Sorry in advance if this has been asked multiple times before, but i did a search and didn't come up with an answer. Just installed a Tim's boost gauge (upto 2 bar) on my defender 90 300tdi. I fitted it by removing the handy bolt on the back of the manifold and replaced with a banjo with the pipe to guage attached there. Took out for a drive and the Max boost it read was 0.5 bar which seems a little low? Is this correct? and what would the likely causes be?

Thanks
Howard

should be 1-1.2bar (16psi) max

i'd check for any leaks around the pipes and also that your wastegate isn't stuck partially open or that the bit you plugged in isn't leaking

btw, can you confirm what banjo size you bought?

HowiePage · May 28, 2014

Thanks for the advice, I will check it at waste gate T connector tomorrow and see what it reads.

@Trax that is where it is located and it a M12x1.5 bolt.

What's best way to tell if waste gate stuck open slightly?

trax · May 28, 2014

HowiePage said:
Thanks for the advice, I will check it at waste gate T connector tomorrow and see what it reads.

@Trax that is where it is located and it a M12x1.5 bolt.

What's best way to tell if waste gate stuck open slightly?

i'd just check it isn't seized up.

https://www.youtube.com/watch?v=yOKxZ08CVxk#t=302

unclip the rod and make sure it moves easily enough... or if you have an airhose, stick 16psi down the hose to the actuator and see if it moves alright.

it's a bit tight to do, so i'd be checking the hoses first for leaks or delamination as it's easier

HowiePage · May 28, 2014

trax said:
i'd just check it isn't seized up.

unclip the rod and make sure it moves easily enough... or if you have an airhose, stick 16psi down the hose to the actuator and see if it moves alright.

it's a bit tight to do, so i'd be checking the hoses first for leaks or delamination as it's easier

Thanks for your help. I'll have check tomorrow and see if can see any leaks and make sure it not seized.

dstainton · Sep 18, 2017

Don't know bars from windows, but my 300tdi with a boost gauge reads about 5psi normally at a medium idle and maxes out at about 13-15 psi.

Boost Pressure

HowiePage

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SteNova

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Kwakerman

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trax

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trax

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HowiePage

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trax

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HowiePage

New Member

dstainton

Well-Known Member

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