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Help ! Checking The Wastegate Cracking Pressure On My Bike


Boganspeed

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  • Will do skids for food
  • Silver Donating Members
  • Member For: 13y 3m 21d
  • Gender: Male
  • Location: Perth SOR

So I've wheeled the big banger up onto the work bench.

The trouble with this one is it makes a bit too much boost and overpowers the fuel pump and boost sensing fuel pressure reg for the carbs.

So I'm backing off the waste gate actuator (mitsubishi turbo with internal waste gate) to when it's just holding the wastegate closed and installing a Turbosmart boost tee.

I'm trying to come up with a simple way to accurately test the cracking pressure of the diaphragm actuator thingy.

I can turn my compressor pressure adjuster right down but I'm sure that's not accurate enough.

Any idea's ?

I do have a boost guage laying around.

But what can I use to make the pressure and hold it ? Maybe a large syringe ?

Chemists dont sell them, I tried.

A little hand pump would be great, if I could buy one.

B12_zps60e1cc16.jpg

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  • Bronze Donating Members
  • Member For: 13y 6m 29d
  • Gender: Male

failing that buy some vacuum line and a t piece, t your boost gauge into the vac line and plug an air blower into the other end and gently increase the pressure til it opens while monitoring your gauge

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  • Will do skids for food
  • Silver Donating Members
  • Member For: 13y 3m 21d
  • Gender: Male
  • Location: Perth SOR

failing that buy some vacuum line and a t piece, t your boost gauge into the vac line and plug an air blower etc etc

That's something I can do with what I've got now.

Will see about the repco vac thing too as I like that idea.

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  • Moar Powar Babeh
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  • Member For: 19y 5m 2d
  • Gender: Male
  • Location: Perth

Set the Al function on the eboost to your desired cracking pressure, then use one of these :

9318728001034.jpg

Tee'd into the wastegate line and pressurised by an elcheapo Superchump air compressor.

Adjust the wastegate actuator rod until the Alarm sqwarks ands the gate begins to open at the same time.

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