How much vacuum should i see at idle without ac on?

This is what I show now

 

That seems slightly high. Is the car warm? what rpm is it idling at? at idle im just under 20.

 

Seems low man I'm at like 19-20 at idle

 

So how is he high if ur at 20. And he is at 14 haha

 

I'm wondering if your elevation has an effect on vacuum ? Mine is at 19 when idling at operating temp and I'm about 1300ft ASL. If the car isn't to temp it will show a lesser value ...just a heads up.

Edit ...... I was looking and as a rule they say you lose 1'' HG per 1000 feet you go up . Also someone asked this question on a miata forum and a few people responded that they were seeing 13-14'' of vac in colorado so it seems like your good.

 

depending on the elevation, that will have an effect on the amount of vac/boost you would see. Where in Colorado are you?

 

Just outside of denver so 5280 some odd feet.

 

i cant see vac becuse the RPD doesnt show it. prolly not a good thing.

 

i live <100 ft above sea level and see 15-20 vac when the AC is on.

 

I'm the same as MS3. I'm not far above sea level, either.