Auto Meter boost/vacuum gauge accuracy? How to test?
#1
Burning Brakes
Thread Starter
Join Date: Aug 2004
Location: Atlanta, GA
Posts: 881
Likes: 0
Received 0 Likes
on
0 Posts
Auto Meter boost/vacuum gauge accuracy? How to test?
Hi all, I've recently installed an Auto Meter boost/vacuum gauge, having it hook up directly to the fifth port on Laust's vacuum manifold. At idle it only reads about 12 inches, though idle seems solid, and at WOT up to 15psi or so of boost, though I still have the stock wastegate... Might I have a shimmed wastegate? As far as I can tell there is no boost controller on it.. Maybe the gauge is out of whack?
TIA,
TIA,
#2
Drifting
Join Date: Feb 2003
Location: Akron, Ohio
Posts: 2,254
Likes: 0
Received 0 Likes
on
0 Posts
You should only be about 11ish or even 12 at most if the car is stock, which I am guessing. The computer will cut the fuel above that on the over-boost protection, YOU KNOW WHEN THAT HAPPENS!! Another thing to do is go to a shop that does race work (the place I go does street and race) and they will hook it up to a gauge and tell you what it really is. Plus they can tell you if any control is on it.
#3
Burning Brakes
Thread Starter
Join Date: Aug 2004
Location: Atlanta, GA
Posts: 881
Likes: 0
Received 0 Likes
on
0 Posts
Yeah... Lol I'm pretty sure i'd recognize if there was a LBE or something installed, I've had the intake manifold off before (to clean the ICV) but oh well.. Perhaps I'll try taking it to a shop and see what I can do.
#5
Addict
Rennlist Member
Rennlist Member
Mine shows 20 in Hg at idle when warmed up. Thats the normal vacuum.
How did you install it? Did you use soft rubber hose for the whole run from manifold to the gauge?
How did you install it? Did you use soft rubber hose for the whole run from manifold to the gauge?
#6
Originally Posted by theedge
Mine shows 20 in Hg at idle when warmed up. Thats the normal vacuum.
How did you install it? Did you use soft rubber hose for the whole run from manifold to the gauge?
How did you install it? Did you use soft rubber hose for the whole run from manifold to the gauge?
Come to think of it, mine does show 19-20 after warm up....
#7
Might want to look at the gauge with the motor off and see if the gauge reads one atmosphere. This needs to be adjusted for altitude and local pressure but these changes tend to be small
Trending Topics
#8
Burning Brakes
Thread Starter
Join Date: Aug 2004
Location: Atlanta, GA
Posts: 881
Likes: 0
Received 0 Likes
on
0 Posts
Methinks its time for a vacuum leak search... darn. The gauge reads 0psi when the car is off, I would assume that means 0psi from normal atmospheric pressure.
#11
Addict
Rennlist Member
Rennlist Member
Originally Posted by ivai
Methinks its time for a vacuum leak search... darn. The gauge reads 0psi when the car is off, I would assume that means 0psi from normal atmospheric pressure.
IF you used a long run of soft rubber hose, its possible that the vauum sucks shut and that messes with the reading. Ive seen it on a Toyota truck. 12 in of Hg when warmed up would make for a fairly ugly idle I think.
#12
Burning Brakes
Join Date: Apr 2004
Location: Canberra
Posts: 873
Likes: 0
Received 0 Likes
on
0 Posts
Shameless threadjack (sorry)
I have APE chips, and (I think) a shimmed wastegate. I used to get up to 2.2 bar on the stock gauge, but now I only get to 2 bar. My mechanic replaced the J-boot.
Would the new J-boot give me less boost, or do I likely have a leak ?
What should warm idle RPM's be ?
I have APE chips, and (I think) a shimmed wastegate. I used to get up to 2.2 bar on the stock gauge, but now I only get to 2 bar. My mechanic replaced the J-boot.
Would the new J-boot give me less boost, or do I likely have a leak ?
What should warm idle RPM's be ?
#13
how can u see 2.2 on the stock gauge? it only goes to 2.0 doesn't it? APE chips aren't rated to 2 bar are they? you're just meant to use them with the banjo bolt, no wastegates shims or nothing.
#14
Originally Posted by ilikemy944
Just for something interesting, with my car off, I show 1+psi boost.
Do you mean with the key turned on without starting the engine? If so, that is normal. You are seeing 1 bar which is atmosphere.....
#15
UAE Rennlist Ambassador
Rennlist Member
Rennlist Member
Originally Posted by facboy
how can u see 2.2 on the stock gauge? it only goes to 2.0 doesn't it? APE chips aren't rated to 2 bar are they? you're just meant to use them with the banjo bolt, no wastegates shims or nothing.