DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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Boost gauges - mech. vs electric?

 
Old 03-03-2008, 01:34 PM
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Default Boost gauges - mech. vs electric?

The greddy turbo kit I just purchased had an Autometer Phantom mechanical boost gauge thrown in with it - I noticed that it's mecanical - you have to run a vac hose into the cabin to it.
Are mechanical boost gauges good enough to use? Accuracy/response/reliability?

I noticed the electronic boost gauges are $150+ - wow. I suppose because they include a MAP sensor and have peak boost memory etc. which would be cool to have, but I'd rather keep the money and use the one I've got if it will work accurately enough.
Here's the one I have:
http://store.summitracing.com/partde...5&autoview=sku

What do you guys think?
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Old 03-03-2008, 01:35 PM
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they are usually within 1-2psi.

they read correctly but the scale may be off. no real reason to dump $150+ into a boost gauge....
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Old 03-03-2008, 01:49 PM
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Just make sure to keep an eye on how you run your vac. line.

Make sure you don't have any kinks or pinches, and it will work just fine.

Used them for years.

-meaty
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Old 03-03-2008, 01:51 PM
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I'm pretty sure that mechanical gauges get more innacurate as they reach the limit of the gauge. Mine is pretty good up until about 11-12psi, but when I get any higher, the accuracy drops off.

I hit boost cut at 16psi when the gauge is only reading 14psi.
On my initial build, I dyno'd with a MAP sensor showing spikes to over 18psi and the gauge never got above 15psi.

I knew if I ever wanted to boost above 15psi, the gauge was going to be the least of my worries, so I bought a ~30-15psi unit from StewartWarner for the fidelty. I can accurately see 1/4psi increments on the gauge. Perhaps a gauge that reads higher won't have the innacuracies lower on the gauge.
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Old 03-03-2008, 02:10 PM
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I have a prosport electric boost gauge and its pretty accurate everywhere from -20inhg to 0 psi. LOL
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Old 03-03-2008, 02:19 PM
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Originally Posted by Saml01 View Post
I have a prosport electric boost gauge and its pretty accurate everywhere from -20inhg to 0 psi. LOL
I have one of those too, not installed yet but will be soon. Are you saying it is inaccurate above 0 psi?
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Old 03-03-2008, 02:21 PM
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Got my digital boost gauge from ProSport for $80. Think you can find them from a 3rd party for less. Mine matches what my Profec A says.

http://prosportgauges.com/Digital-boost-1.aspx
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Old 03-03-2008, 02:22 PM
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Lol, well for now my greddy is going to be running as intended by greddy - so 4.5-5 psi and with nothing but the vortech fmu. If it were even creeping up to 6 psi I'd need to know so I could adjust the wastegate b/c that's not very safe without anything else done - no IC, no fuel upgrades, etc.

Since this gauge is a 30 vac - 20 psi, the 0 - 5 psi gap is pretty small on the gauge... I don't think I'm going to be able to tell the difference between 5 psi and 6 psi on the gauge if it has a bit of innacuracy.....

-Ryan
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Old 03-03-2008, 02:25 PM
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Originally Posted by Saml01 View Post
I have a prosport electric boost gauge and its pretty accurate everywhere from -20inhg to 0 psi. LOL
Are you saying it's crap? How did you test it? This gauge looks good on paper as it's electric and has a nice price and is digital so you don't have to read a needle gauge, it just gives you the number straight... I'd buy it unless you're saying it's no good...

-Ryan
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Old 03-03-2008, 02:31 PM
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i dont believe he's turboed yet....
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Old 03-03-2008, 02:46 PM
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Originally Posted by Braineack View Post
i dont believe he's turboed yet....
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Old 03-03-2008, 07:44 PM
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DOH! :head slap:

sorry well then this seems like a nice affordable electronic boost gauge!
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Old 03-03-2008, 08:12 PM
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I have a very similar autometer that is also mech - it's a nice gauge, works well moves quickly/smoothly and like the guys say watch the line going into it for pinches etc.. Other than that I happen to like analog gauges for some things and this is one of them. Also a ~50$ autometer (works perfectly well) vs 150+ dig = 100 to put towards somthing else :-) Autometer doesn't suck - they're not the high end but they're not the bottom either. If you don't like the -30 - 20 sell it and get the -30 - 15 (unless you're going to go big later in which case a 50$ gauge will be the one of the cheapest components in the mix anyway).
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Old 03-03-2008, 08:16 PM
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http://prosportgauges.com/green-whit...ost-gauge.aspx

$55 for an electric that looks like an analog
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Old 03-03-2008, 08:19 PM
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I've had 2 brand new Autometer boost gauges, each were over 50$ each. Right out of the fuggin box both were showing boost! One of them after installing in the car shows 4psi with the car OFF.

I'd buy the ProSport, seriously. its like $70 for an electric and they're really accurate.
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Old 03-03-2008, 08:37 PM
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Originally Posted by SamS View Post
http://prosportgauges.com/green-whit...ost-gauge.aspx

$55 for an electric that looks like an analog
Yeah that is the one I have, but with a clear lens instead of smoked. The smoked looks cool but I read some complaints the smoked is hard to read in daylight.
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Old 03-05-2008, 01:07 PM
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For reference my digital ProSport read -10 to -11 @ idle and 0 @ off.

Last edited by trito; 03-05-2008 at 01:52 PM.
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Old 03-05-2008, 01:28 PM
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Originally Posted by trito View Post
For reference my digital ProSport read -10 to -11 @ ideal and 0 @ off.
Didn't really understand this post...
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Old 03-05-2008, 01:53 PM
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sorry wasn't thinking when I typed, meant "Idle"
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Old 03-05-2008, 01:54 PM
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is that good or bad...?
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