How many inches of vacuum do you get while idling - SRT Forums

Street Gear · 05-19-2009, 11:24 PM

Hey guys how many inches of vacuum are you getting while your car is idling? I get between 12-14 inches of vacuum but I noticed on my buddies car he gets about 18-20. I am trying to figure out is it my gauge or is there something wrong.

It's either my car, my gauge or his gauge is not accurate. Please let me know what you get and is your car on stock cams?

ziggo0 · 05-19-2009, 11:25 PM

Stock cams are around 18 ~ 20.

I have BC Stage 2's and I sit about 13 ~ 15.

AdvanSRT-4 · 05-19-2009, 11:26 PM

I'm at about 14-15 with Crane 12 cams.

Street Gear · 05-19-2009, 11:36 PM

OK so why is my vacuum so low 14 on stock cams? I am wondering am I having a vacuum leak somewhere? How do you find a vacuum leak?

bene · 05-20-2009, 12:20 AM

notice the car running a little rough or hear skipping in the exhaust like the RPMs are really low?

Silver SRT4 · 05-20-2009, 12:21 AM

I am about 12-15 with Crane 12's

ziggo0 · 05-20-2009, 12:59 AM

Did anyone own this car before you? If so, pull your valve cover off and take us a picture

Street Gear · 05-20-2009, 01:00 AM

Quote: Originally Posted by bene

notice the car running a little rough or hear skipping in the exhaust like the RPMs are really low?

No the car idles perfect I think it must be my gauge. My OBD2 scan gauge reads 18.9 in/hg which is more closer to normal however the factory mechanical gauge reads 14 in/hg. What do I believe? I am wondering since it is a 20 PSI gauge if boosting over 20 PSI on a regular basis has ruined the gauge? I know it reads boost properly up to 20 psi but vacuum is another question.

1FASTMOPAR · 05-20-2009, 01:04 AM

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Street Gear · 05-20-2009, 01:05 AM

Quote: Originally Posted by ziggo0

Did anyone own this car before you? If so, pull your valve cover off and take us a picture

The cams are definitely stock I bought the car with about 15K miles on it from a kid that wouldn't know how to modify if his life depended on it.

Legoman · 05-20-2009, 02:46 AM

Quote: Originally Posted by 1FASTMOPAR

Is anyone interested in bad ass diamond plate floor mats? If so PM me.

Nice try - threadnapper!

whitethunder 1-8-8 · 05-20-2009, 04:29 AM

When the car is off what dose the gauge sit at. I had a similar problem when i got mine also with stock cams, my SRT gauge was broken...POS

Knerrbo · 05-20-2009, 04:34 AM

mine bounces between 18 to 16 , depends on how hot it is... also the vacuum drops to like 15 when the A/C is on. (but that's normal...................right?)

I haz aftermarket boost gauge, so I think I have a vacuum leak.

bnistor · 05-20-2009, 01:10 PM

My vacuum sits at about 20-21 at idle. Stock cams.

bLaCkZeSt · 05-20-2009, 01:47 PM

I sit anywhere between 18-20 on stock cams.