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Boostgauge on Map line

 
Old 03-10-2018, 12:27 AM
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Default Boostgauge on Map line

Hi all,

I'm about to connect up and plumb in a standalone ecu and wanted to check if it's a terrible idea to have an analogue boost gauge use the same line that connects the map sensor to the throttle body.

I like the idea of only having to feed a single vacuum line through my firewall and having a t piece on the line behind my dashboard.

That said, I don't want to run a boost gauge off the vacuum line if it will interfere with the reading going to the map sensor.

This car will eventually be turbocharged running 10psi of boost.

Can I run my boost gauge from the map vacuum line without causing issues?
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Old 03-10-2018, 12:59 AM
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possible, but not advisable
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Old 03-10-2018, 03:21 AM
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In the Flyin' Miata turbo install instructions it says it is ok to have your boost gauge feed off the line (see page 39). That said, I was wanting to know if anyone has actually seen issues with this? Would it become a concern with a cheap boost gauge or is the pressure difference still small enough to be negligible?
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Old 03-10-2018, 03:31 AM
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flyin miata and their crappy hydra and even crappier me221 is hardly a reputable/authoritative source of info around here.
people that aren't set on selling you outdated and knockoff crap usually tend to provide unbiased input.
it can create noise in the map signal.
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Old 03-10-2018, 06:58 AM
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@18psi you are pathetic
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Old 03-10-2018, 12:24 PM
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Originally Posted by RichieVee View Post
@18psi you are pathetic
Oh yeah? How so?
Because I post the truth, or because you don't like the truth?
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Old 03-10-2018, 12:26 PM
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You can't HANDLE the truth!
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Old 03-11-2018, 04:20 PM
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You know what's pathetic?
Making a duplicate profile just to insult a moderator.

I had a reason, but didn't care, now you gave me motivation

Last edited by 18psi; 03-11-2018 at 04:31 PM.
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Old 03-11-2018, 06:35 PM
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I used the boost gauge line on my 90 supercharged miata and it actually had less noise than when i had it plumbed directly to the IM, i think that the boost gauge bellows actally dampened some of the SC pulses. Never had an issue with it
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Old 03-12-2018, 01:26 AM
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Originally Posted by concealer404 View Post
You can't HANDLE the truth!
Oh, I have lots of truths to share!
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Old 03-12-2018, 01:28 AM
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Originally Posted by RobJ View Post
In the Flyin' Miata turbo install instructions it says it is ok to have your boost gauge feed off the line (see page 39). That said, I was wanting to know if anyone has actually seen issues with this? Would it become a concern with a cheap boost gauge or is the pressure difference still small enough to be negligible?
18psi is going to tell you what's the best way to do things. He pisses excellence. From the first moment he wakes up until he finally decides to end his day.
Just because other things might work... doesn't mean they're the best.

You asked. He answered. Do what you like with the info he gave you.
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Old 03-12-2018, 01:51 AM
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I had figured a clean map line would be best practice but was hoping you'd compliment me for finding a way to be lazy while sticking it to the capitalist auto parts retailers by buying 2m less vacuum line (that'd show em!)

Alas, 18psi put the fear of God in me.

I'm just going to run a clean map line and route my boost gauge separately.

Thanks for the input y'all.
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