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Honestly, autometer boost gauges are not very realiable. Some reacts quick and some are slow. When I heard about people dogging out the autometer gauges, I conducted an experiment when my gauges got stolen from my car. I needed to get another gauge anyway. This is using the standard tube that came with the gauge. This is what I did with my MBC set at 6 psi:
Autometer Boost gauge #1:
Bought it from Pepboys.
-installed it
-boosted
-observed
-took readings
Findings: After driving my car a few times, I was not happy with the readings. The needle was too slow and reads slighlty above 0 when the motor is not running and displays 5 psi when I was supposed to be boosting 6 psi.
Returned the gauge to Pepboys. The previous boost gauge I had (that got stolen) reacted way quicker. I assumed that the new one was just bad and convinced Pepboys to get me another one.
Autometer Boost gauge #2:
-Repeated the same steps
Findings: With the motor off, the gauge reads slightly above 0 and boosted 7 psi. The gauge reacted quicker than boost gauge #1. Did a few runs to make sure.
I went to a different Pepboys and told them that the gauge does not work properly. They gave me another one
Autometer Boost gauge #3:
-Repeated steps
Findings: Reacted just as quick as boost gauge #2. Boosted reading at around 5 psi and slightly above 0 witht the motor not running.
Conclusion: Being in the Navy has some privileges. My buddy hooked up the gauge to one of our calibration tester. It shows that gauge #3 is off by .5 psi after readings past 12 psi on the plus side. On the negative side, 1 in'hg is off all the way. It's not too bad. That is really almost unrecognizable when monitoring an analog gauge. I think it's just that the bellows material Autometer use is not consistent but will still do it's job. My Teg will not posses this boost gauge tho. I have a GReddy boost gauge and a GReddy A/F ratio gauge for it. Not installed yet tho.
As far as the reaction time of 2 different tubing, I didnt see the difference, I think maybe it was because I was boosting in such as low level. I would think that the stock plastic tubing should react faster with Bernouli's principle of convergent-divergent process. Less tubing diameter means less space/area to fill, so it should increase velocity.........
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