DIY Boost Gauge for $60

[MickL Addicted PP Member Find all posts View Profile Close MickL]

Re: DIY Boost Gauge for $60

I like to know if you guy's get a vacuum reading on the boost gauge? If no, why is that?. I got one installed on my 1KZ-TE, and one of my mate ask me how come my boost gauge doesn't read vacuum?, and I just answer maybe its just a diesel engine different from a petrol engine. Just want to really know what the answer is. Unless there is something wrong?

If you have plumbed your gauge pre venturi/butterfly plate (intercooler side) then you will not see any vacuum at all read on your gauge.

If you plumbed it post venturi/butterfly plate (manifold side) you will see approx 5-7 in.Hg at idle and maybe between slow gear changes in a manual also sometimes during decelleration. 5in.Hg is a very small negative pressure (look at the scales on the gauges shown in this thread)

Diesels generally don't run a throttle plate hence no intake vacuum.
Some like the 1kz and d4d are an exception to this rule. They run an intake venturi/butterfly to create a small vacuum at idle to draw in large amounts of EGR gasses to meet emissions standards.

Mick

[chubbo Lurker Find all posts View Profile Close chubbo]

Re: DIY Boost Gauge for $60

Hey Mick,

Thanks for the info.

Cheers, chubbo

[the_tango Lurker Find all posts View Profile Close the_tango]

Can I see photo of re-plumbed tee section for your boost guage

replumbed gauge as mick said and it does reduce needle shake at low boost but i still get shake at idle. thanks samo

Hi Samo,

I'm not sure if you're still around and/or have your 120, but I'm looking to install an EGT and Boost guage and would like to know where exactly you re-plumbed the tee section for your boost guage. If you could post a photo that would be awesome!

Cheers

[the_tango Lurker Find all posts View Profile Close the_tango]

If you have plumbed your gauge pre venturi/butterfly plate (intercooler side) then you will not see any vacuum at all read on your gauge.

If you plumbed it post venturi/butterfly plate (manifold side) you will see approx 5-7 in.Hg at idle and maybe between slow gear changes in a manual also sometimes during decelleration. 5in.Hg is a very small negative pressure (look at the scales on the gauges shown in this thread)

Diesels generally don't run a throttle plate hence no intake vacuum.
Some like the 1kz and d4d are an exception to this rule. They run an intake venturi/butterfly to create a small vacuum at idle to draw in large amounts of EGR gasses to meet emissions standards.

Mick

Hi Mick,

I'm not sure if you're still around and/or have your 120, but I'm looking to install an EGT and Boost gauge and would like to know where exactly you plumbed the tee section for your boost gauge. If you could post a photo that would be awesome!

Cheers

[wes Senior Member Find all posts View Profile Close wes]

the_tango

Mick L is now using his business: OziOffroad


Search for both samo and Ozioffroad and maybe private message them.