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Old 03-21-04, 04:52 PM
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turbo guys come here plz
ok i got a boost gauge a while ago and i figured i could put it on about any line goin into the intake manifold.. so i put my boost controller t-valve thing on one of the vacuum lines that come from the intercooler.. but it reads me like 13-16 vacuum ..it shows boost right but the vacuum is weird... i was just wondering if u could post where u put ur boost gauge in and what ur readings are..pics would help
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Old 03-21-04, 04:55 PM
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13-16" is more or less normal at idle for an older engine.
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Old 03-21-04, 04:58 PM
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Just curious, whats good on a rebuilt engine, say right after break-in?

-Ben
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Old 03-21-04, 06:06 PM
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You MUST install a VACUUM gauge AFTER the throttle plates (on the engine side). I'm ignorant on where to place a boost gauge, seems it'd work well there too.
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Old 03-22-04, 12:45 AM
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20" to 18" for stock ports
18" to 16" for mild street port
16" to 14" for aggressive street port
14" to 10" for bridge port


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Old 03-22-04, 01:56 AM
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thanks, I should be hoping for roughly 16
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Old 03-22-04, 02:08 AM
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i just hooked my boost gauge to the pressure sender on the pass side of the car. works fine. i get 18"-20" even with a high-mileage S4 engine. currently at ~103,xxx.
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Old 03-22-04, 06:07 AM
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i got 18 on my street port.
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Old 03-23-04, 08:27 AM
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well im getting like 13-16 on stock ports.. so can u guys post likea pic or something showin where urs is??
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Old 03-23-04, 08:54 AM
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How old is your engine?

T it off one of the nipples on the plenum.
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Old 03-23-04, 09:19 AM
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I get about 18-19 with my Jspec, I guess I got a low milage one.
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Old 03-23-04, 11:52 AM
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its 88 wit 60k miles...plenum? can u describe that?
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Old 03-23-04, 01:23 PM
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I get about 14 on the vacuum....My motor is ported rather, big.
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Old 03-24-04, 05:50 PM
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any others?
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Old 03-24-04, 06:20 PM
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You can tap it in the vacume for the Pressure sensor, or your vacume that goes to your Blow off valve.
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Old 03-24-04, 06:32 PM
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17" on rebuilt stock port with about 50,000 miles
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Old 03-24-04, 06:39 PM
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14" streetported 6,000 miles
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Old 03-24-04, 07:13 PM
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12-13" super streetported 700 miles
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Old 03-25-04, 12:39 AM
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15-16" streetported about 3,000 miles
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Old 03-25-04, 12:48 AM
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15" on stock port
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Old 03-25-04, 12:48 AM
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Originally posted by boostin13b
You can tap it in the vacume for the Pressure sensor, or your vacume that goes to your Blow off valve.
You don't want to tap it off the pressure sensor, there is a little black insert in one end of the line, you don't want to mess with the pressure that sends/reads from that.
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Old 03-25-04, 12:54 AM
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I see about 20vac on my jspec motor. Think its 20, ****, been 2 months since I drove her really so cannot remember now...lol
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Old 03-25-04, 12:59 AM
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How would I convert my vacuum pressure from my Greddy guage(boost is in bar readings, can't remember what the pressure is in..)
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Old 03-25-04, 01:08 AM
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Originally posted by mightymouse0x
You don't want to tap it off the pressure sensor, there is a little black insert in one end of the line, you don't want to mess with the pressure that sends/reads from that.

errm ok, so WHERE is the Proper spot to tap for boost reading. I didn't realize having it tapped at the pressure sender was a bad idea.

not to jack the thread...
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Old 03-25-04, 05:25 AM
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How many PSI in one BAR?
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