its in inHg

 

[quote name='BoneT2&Harmony' date='Apr 17 2005, 01:51 PM']turn off your anti-lag. maybe that's the problem.


[/quote]

didn't know i had the ability to turn it on



[quote name='FikseRxSeven' date='Apr 17 2005, 01:53 PM']did you get your motor ported when you had it rebuilt? and how long ago was yoru rebuild?


[/quote]

10k miles ago, it was polished not ported. but ever since i got the car at 3k miles on rebuild it has been at that value



[quote name='Dramon_Killer' date='Apr 17 2005, 02:48 PM']its in inHg


[/quote]

your gauge? mine is in mmHg



here is a pic of it which shows the maximum vacuum of 736 mmHg, which is about 14.5 psi if converted



760 mmHg = 760 torr = 1 atm = 14.7 psi

 

[quote name='SidewaysFC' date='Apr 17 2005, 06:02 PM']didn't know i had the ability to turn it on

10k miles ago, it was polished not ported. but ever since i got the car at 3k miles on rebuild it has been at that value

your gauge? mine is in mmHg



here is a pic of it which shows the maximum vacuum of 736 mmHg, which is about 14.5 psi if converted



760 mmHg = 760 torr = 1 atm = 14.7 psi


[/quote]

= 101.3 bar

 

[quote name='Dramon_Killer' date='Apr 17 2005, 08:12 PM']= 101.3 bar


[/quote]





WRONG.



14.7 psi = 1.01325 bar = 1 atm = 101.325 kPA = 760 mmHg = 760 torr



1 bar = 100 kPa <-- don't get this wrong! or else space ships will implode and nuclear power stations will meltdown. Thank god engineers design with margin of safeties (aka fudge factors)



you are off by a factor of 100, I don't even think Mazda designs their cars with a safey factor of 100. NASA doesn't forsure.

 

oops, i get about 350 mmHg at 750 rpms and 375 mmHg at idle(900 rpms). seems to be around what those who contributed are at. thanks guys.

 

http://www.anver.com/document/company/Refe...des/vacuum.html



350mmHg = 6.8psig

375mmHg = 7.3psig



You got boost leaks or something?





-Ted

 

[quote name='drunkin_idiot' date='Apr 16 2005, 06:33 PM']15-20mmhg is ideal, but 20mmhg is best on any gauge.


[/quote]



You're thinking inches of mercury. 15-20 in/hg is good vacuum numbers for idle.



15-20 millimeters of mercury is only about 0.5 inches of mercury... your engine would hardly be running with those vacuum numbers at idle.



15-20 in/hg is 380-500 mm/hg.



On decel, its not uncommon to see 24-26 in/hg.



~29 in/hg is the lowest vacuum possible.

 

[quote name='RETed' date='Apr 23 2005, 04:02 AM']http://www.anver.com/document/company/Refe...des/vacuum.html



350mmHg = 6.8psig

375mmHg = 7.3psig



You got boost leaks or something?

-Ted


[/quote]



Not that I am aware of. The car boosts fine and idles fine, except for sticky throttle. A lot of my vacuum/boost sources are T'd off, but I don't think that would have an effect. To be honest, everyone keeps mentioning it is low, but I have taken it in to several mechanics for other problems and they have never mentioned my vacuum to be lower than normal. But it does worry me still.

 

Oh!

Get rid of those ()^)#(%$)@# T's!

Try and plumb the boost gauge hose straight into the fitting with no T - the vacuum should read "higher".





-Ted

 

Ok