View Full Version : boost gauge readout

09-20-2005, 07:15 PM
hi i just installed a greddy 52mm boost gauge in my stock a4 01 and from what i read 20-22 psi is normal but my gauge only reads out mmHg and kg/cm2. how do i know if it runs normal in mmHg or kg/cm2?sorry if this is a dumb question but it would be very helpful. tia

09-20-2005, 07:25 PM
20-22 psi on a stock a4???

09-20-2005, 07:26 PM
or somewhere..i'm not sure i must have read it wrong then

09-20-2005, 07:26 PM
If you mean 20-22Hg that is normal.

09-20-2005, 07:37 PM
the needle points at 500 here's the link to greddy http://www.greddy.com/prod_52mm_gauges.htm . does that mean i have a boost leak? tia

09-20-2005, 07:59 PM
you need to tell us where the needle is at what time. is it at 500 when the car is idle?? at speed?? on the throttle? where does the needle go when you gas it, or floor it? please be more specific.. also. if you wanted to do a search, you might be able to get some more helpful info.. search button is at the top right hand of your screen..

09-20-2005, 08:02 PM
Ok the boost on your gauge is in Bar. So you should be at around .7 bar.

09-20-2005, 08:05 PM
i'm sorry but i have search and read a couple of post but i just cant find the answer to it. it idles at 500 and when i rev it, it goes a lil below 0. i'm sorry i'm just a noob.

09-20-2005, 08:09 PM
It's all good man. I don't know much about the way your vac read out is setup only the boost. The reason you are only seeing around zero when you rev is because your not under boost. You need to do some WOT (Wide Open Throttle) runs and see where your boost spkies at. You should be around .7, maybe a hair more.

09-20-2005, 08:30 PM
yeah i just barely did that and it hit about 0.7, thanx for the help.

09-20-2005, 08:35 PM
Sounds good. You will get a higher reading in 3rd gear btw.

09-20-2005, 09:56 PM
500mmHg ~ 19.7 inHg

don't buy chit if you can't even understand the scale units... what use is it?