Boost guage

[Dspeed]

All fitted! Pics 2moro.

Now wt does it all mean, I no the principle but dnt understand the negative bit?

[Edmondo]

I dont understand any of it mate:hysterical: :hysterical: :hysterical:

[Scoobylove]

the positive is the good part.the negative is the not so good part..:giggle:

[Dspeed]

Oh dear!

[Edmondo]

Why Rob?

[beachsleeper]

All fitted! Pics 2moro.
What happened. Did it take you all day to fit. :hysterical: :hysterical: :hysterical:

Now wt does it all mean, I no the principle but dnt understand the negative bit?.

[Dspeed]

When U drive off the acc negative presure then on the acc presure rises up tp 15 psi. Wts the neg bit? IS 0 bar a negative psi?

[Scoobylove]

dspeed............i was only kidding about the positive and the negative thingy.......:lol:


i know nothing about cars......,,assumed youd know i was joking:hysterical:





note to ones self.................dont tease dspeed............:giggle: :giggle: :giggle:

[Agent Smith]

you teasing again?

[Dspeed]

I knew u were jokin scoobylove. X

[Scoobylove]

got up this morning and beachsleeper moaned at me for upsetting you and getting you all worried:sad-smiley-046:

[Agent Smith]

domestic?

[Scoobylove]

we dont have domestics.................i shout graham says yes dear...........harmony all round:hysterical: :hysterical: :hysterical:

[Agent Smith]

normal marriage then.

[Dspeed]

Oh dear!

I stand by my quote! After scoobyloves first post this threat has been hijacked into a domestic! lol N I still dont no wt the presure thing means! lol

[scoobysteve]

The - is when you've got your throttle closed and the turbo isnt spinning with the engines still sucking in air. this is causing a small vaccum in the inlet manifold and when your foot is down the turbo pressurises the inlet manifold putting it up into +. Mine is in bar and goes upto .8.

[Edmondo]

The - is when you've got your throttle closed and the turbo isnt spinning with the engines still sucking in air. this is causing a small vaccum in the inlet manifold and when your foot is down the turbo pressurises the inlet manifold putting it up into +. Mine is in bar and goes upto .8.

Well done Steve - Its not nice when people muppetise important threads:hysterical: :hysterical: :hysterical:

[beachsleeper]

The - is when you've got your throttle closed and the turbo isnt spinning with the engines still sucking in air. this is causing a small vaccum in the inlet manifold and when your foot is down the turbo pressurises the inlet manifold putting it up into +. Mine is in bar and goes upto .8.
Well done steve thread back on track, Good job Ed did not post :hysterical: :hysterical:

[Broxi]

Moving this to the Correct Forum. Technical Help!!!

As already Said, The - is when you have a Vaccume in the Inlet Manifold, And is Std for all cars inc N/A this is not anything you need to have concerns about. 0 is as you thought running 0 Psi/Bar and also no Vaccume in the Mannifold.

Derek

[Dspeed]

Ok cool, Im running a constant 16 psi from 3k to 5.5K starts to trail of at this point.

[scoobysteve]

Im just showing off my know how!!:hysterical:

Ed id never say you would mupetise a post just to whore. :hysterical: :hysterical:

[Neil G]

When on idle/cruising the engine is 'sucking' air out of the inlet which will read as negative pressure on the gauge.

When under boost the turbo is forcing air into the inlet which reads as positive pressure on the gauge

There is also some guff about atmospheric pressure too in relation to boost pressure but I can't remember off the top of my head what the exact details were.

[Neil G]

Here we go

Boost pressure on gauges is measured as manifold relative pressure i.e pressure inside the manifold only.

Manifold absolute pressure....pressure relative to a complete vacumn so it's the value on the guage plus the atmospheric pressure which is 1 bar (14.5 psi).

[scoobyDAZZA]

Ok cool, Im running a constant 16 psi from 3k to 5.5K starts to trail of at this point.


that in 4th or 5th ?
seems quite high for a 99uk
is it been mapped ?
when mine was standard my00 it hit 0.8 bar ish
now it hits 1.45

16 psi is roughly 1.15 bar

[Dspeed]

When ever above 3k RPM and on the gas. And yea, shes running a ECUTEK 2 Map.

[Dspeed]

Had my stupid guage calibrated now to military spec. Car runs at 17.35 PSI or 1.2 BAR!

[The Daddy]

The - is when you've got your throttle closed and the turbo isnt spinning with the engines still sucking in air. this is causing a small vaccum in the inlet manifold and when your foot is down the turbo pressurises the inlet manifold putting it up into +. Mine is in bar and goes upto .8.


the turbo is allways spinning.........the air to the manifold is drawn in by the pcv valve under the throttle body..........mine runs upto 1.6 bar but is set to 1.1 bar at the mo......

it is slow you see......