mmHg to PSI

[paulr33]

Hey All,

Ive got a factory boost gauge in the dash just inside the speedo which is boost pressure but its in mmHg. Ive got -7 to +7

I have ever only had it reach about +3.5 at the most. Im running stock boost with no mods. I'm guessing this would be around the 7psi mark in the spool? Or is it something else?

Can anyone shed some light?

Thanks

[BigDatto]

0 = 0 PSI

1/4 = 3.36 PSI

1/2 = 6.72 PSI

3/4 = 9.1 PSI

FULL = 13.4 PSI

Hope this helps

[akeenan]

there was a chart posted up here a while ago converting these figures to psi... from memory 3.5 is pretty close to 7. try and do a search for it, you may be able to find it.

[Lozza150]

Ahhhh.... here i was thinking that my skyline was running lower boost than 7psi

That $300 guage wasn't necessecery.....

DOE!!!!!

..Not....

[paulr33]

Thanks everyone, this makes a bit more sense now.

[EnricoPalazzo]

An aftermarket boost gauge is a definate if u are ever planning to run more boost.

[Al]

What makes an aftermarket boost gauge so definate? I do not see the need for these show-off gauges, if you have a reliable bleed valve and have dynoed the car.

[Duncan]

Lozza150, classic avatar. Got a full size pic?

[red900ss]

1 bar=14.5 psi=750 mmHg

[EnricoPalazzo]

Bleed valves spike

so u may do damage to ur turbo

and as we have ceramic turbines

it may only take one spike to screw the turbo.

Im just sayin i believe that a boost gauge is always a good thing to ensure boost is at the level u want.

[Lozza150]

I dont know how to post pic's here.....

[hippy]

hello paul ... i have the same problem in my car ... i've been told that i have a boost leak somewhere so u might wanna take it to someone and tell them to put a boost gauge on it and they can tell u what psi u are running ... i'm only running 6 right now and my gauge only goes up to where u've described. hope thats helped.