bbyevo8u

iTrader: (14)

ok i installed my boost gauge a week ago and i made sure that the boost line that plugs into the gauge would not leak "put like 8 zip ties on"!! so my problem is the gauge always red about "20- vacuum" at idle now i was messing around with this kid that has a 30R turbo sti "440whp" and i was running the car hard for a little while so i check my gauge at idle and now its reading "15- vacuum" as if i have a vacuum leak but i know its not from the line to the gauge though and it has not went back to normal for a day now so where could it be from and how do i check cause i know 15- vacuum is not rite can someone please help me out here.....thanks

raiceboi697

iTrader: (42)

you have to get/make/ or have some one do a boost leak test for you and you will find if you have any leaks. -20 for idol is a lil low i think. i only see that when im engine breaking as i wanna say stock cams -15 is about right for idol. do a leak test and you will find the culprit

bbyevo8u

iTrader: (14)

15- is rite??? anyways very weird it went back to normal 19- why did this happen???

bbyevo8u

iTrader: (14)

when i first put the gauge on before i put the 8 zip ties on the hose to the gauge was leaking a very little bit "it was about 14-/15-" so when i put the zip ties on it stoped the leak and stayed at 19- untill the problem i had? i just want to know what my vacuum at idle should be on my aftermarket gauge for someone who know about this please help thanks!

bbyevo8u

iTrader: (14)

bump......what does evryone's aftermarket gauge read at idle???

EvolNinja

iTrader: (22)

900 to 1000rpm

EvolNinja

iTrader: (22)

My bad, I didn't see the "aftermarket" part that is my stock tach reads.

tripperfx3

iTrader: (6)

Mine, at 4000ft, read anywhere from 18-15, but now with cams it reads about -14 at idle. Not sure where in NY your at, but do you think altitude could come into play? I moved from GA (sea level) to Reno, NV and when I 1st moved here my boost gauge would read -20, but after a while it eventually settled to 18-15 like I mentioned. It would sometimes go to -20 as well. Sorry if that seems confusing sounding.

Burklow

iTrader: (3)

Usually -15 in hg. Sometimes it'll read 17-18 at idle, but not often. Engine braking is like -21-22 in hg.

Redline-Z

iTrader: (1)

highest Vac I have ever seen is -21, at idle im at 16/17, AEM Truboost

bbyevo8u

iTrader: (14)

when you get a vacuum leak you get less vacuum right?

PHDoc19

iTrader: (9)

Use copper plumbing (fittings, ferrules, etc). Zip ties just can't provide enough tension for a reliable seal.

Burklow

iTrader: (3)

What about T-bolts for vacuum lines? I might try hose clamps or something. I'm paranoid about leaks.

[Not to clutter the thread, but are you on the EvoATL forums? You should definitely join. evoatlanta.com]

AF-Evo8

iTrader: (113)

this is what i've had in my car

stock - 16 to 18

hks 272's - 14 to 16

comp 280+ - 10 to 12

lancerMRguy

iTrader: (2)

mine is 18 or 19 at idle and 14 or 15 with AC on at idle