how vacuum do you supercharged guys read at idle ?

jimg92373 · 02-28-2008

i have a 98 cobra with a vortech v-2 sq blower . I read between 10-15 vacuum at idle . is this normal ?

blue72mustang · 02-28-2008

My 05 with a Procharger reads the same at idle, it will only show boost when it spools up and shuts the vacuum blow off valve (3000 rpm for me) and then it will go up to 10 PSI

FM2K GT · 02-28-2008

mine reads more towards 20 at idle

BT1288 · 03-14-2008

With my Kenne Bell it reads 18-20 at idle.

v8tiger · 03-20-2008

it reads around 12 at idle for me. I think it depends on your cam too. I have a V-2

jimg92373 · 03-20-2008

thanks for all the input . The reason I was asking is that i dont always get a consistant reading . Sometimes i'll start the car and only get 5-10 vacuum . i have already had to send the gauge and the map sensor back to Autometer once and i was wondering if maybe its bad ?

blue72mustang · 03-20-2008

The readings will change based on a number of things, one being the idle speed.