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Old 03-25-2003, 01:06 PM   #1
YooperWRX
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Join Date: Dec 2002
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2002 WRX-Wagon
Midnight Black Pearl

Default Mech. Boost Gauge vs. Elec. Boost Gauge

I'm looking to do a boost gauge install, and was wondering which gauge is more accurate- a Mechanical or Electrical. It seems to me that a Mechanical would be most accurate as it is reading actual pressure, but the majority of available gauges seem to be electrical.

Also, what is the best type of gauge to get. There are several gauge choices out there (including the OEM), so one has to be the best. I've done several searches but, just can't find any good info on them. BTW, will be installing on the steering column- no A-pillar, gage clusters, etc.

Let me know what you all got going on!!!!!
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Old 03-25-2003, 01:29 PM   #2
krazedant
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Old 03-25-2003, 05:19 PM   #3
bobafett
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Quote:
Originally posted by Tyrannosarus Rex
http://forums.nasioc.com/forums/show...hreadid=255488
*** is this?

Do I have to read through 7 pages of a thread called "Post pics of your gauges setup" to find out where (if it even exists) the answer about electrical/mechanical guages is? You could have just copy/pasted the info for us rather than the link.

Sorry for being an ass, but that link will just waste everyones time...when you could have easily just spent a few minutes answering it yourself. Or, simply just don't post at all.



If anyone has an answer to the question, I'd be interested in knowing as well.
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Old 03-26-2003, 11:49 AM   #4
satrya
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Default depends on the quality

Imho, there's no definitive answer to this.

A mechanical boost gauge requires the pressurized air to be sent through the firewall to the cabin. If the tubing is rigid enough, does not present a noticeable restriction (think of the extreme where you use a 1mm diameter tubing, or tubing with a very rough inner wall, for example), and at the same time not being too large (say, 2 inch diameter, which is absurd of course); then it is all up to the accuracy and precision of the pressure diaphragm and dial mechanism on the gauge. For that, the quality/make of the gauge itself is probably the only factor.

An electrical boost gauge uses a locally mounted pressure transducer (in the sender unit), which may be the diaphragm-based system. While I don't know about pressure transducer used in electrical boost gauge, I know that there are various kinds of pressure transducers used in the industry. Each have their own advantage/disadvantage, but any one of them should probably be sufficient for the kind of pressure levels and rate of change that we may be interested in. Aside from whether or not the pressure transducer is calibrated properly, there is also an issue of the electrical wiring. If the wiring is done using the proper gauge wire, and proper grounding, then the reading should be accurate/precise as well.

I'm sure an electrical boost gauge with a poorly calibrated pressure transducer or poor grounding can perform worse than a so-so (and usually less expensive) mechanical boost gauge. The opposite can be true too.

Imho, mechanical boost gauges' main advantage is the price, while the electrical boost gauges' advantages are probably ease of installation (no thick tubing through the firewall, no thick tubing tethered on the gauge), and the possibility of adding a memory unit (to store peak boost etc and display later).

Quote:
It seems to me that a Mechanical would be most accurate as it is reading actual pressure, ..

While I personally chose mechanical gauge, I'm not sure I agree with the opinion that mechanical gauges are more accurate because "they read actual pressure". None of them do, in a way. Mechanical boost gauge converts air pressure into diaphragm deflection, then through the dial mechanism, turns it into the dial needle angle. Electrical boost gauge converts air pressure into diaphragm deflection (of the sensor), and then converted by the transducer into electrical signal. The electrical signal is converted into needle angle on the gauge.
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Old 03-26-2003, 12:14 PM   #5
Kean
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I researched this before I bought mine and found that it's a debatable subject. There's no black and white answer. Here's a thread I responded to in the past regarding mech vs elec (it's only 6 posts long):

http://forums.nasioc.com/forums/show...electric+gauge

Obviously some of the cons on having a mech fuel press gauge don't apply to a mech turbo boost gauge. .....but I hope this helps in some way.

Regards,
Kean

Last edited by Kean; 03-26-2003 at 12:20 PM.
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Old 03-26-2003, 12:42 PM   #6
YooperWRX
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Default

Thanks for the responses. My search had picked up those threads before and neither of them really gave me a good answer. That thread from T-WRX is phenomenal for anyone contemplating how to mount gauges. Lot of cool pics in there.

I just assumed mechanical would be more accurate, but it sounds like both give the same level of detail I am looking for. I'm not a guy down at the drag strip every night, so I really am only interested in having the gauge to better monitor engine performance on an everyday basis. Thanks for the explanation satrya, you gots to trust a guy who's a Control Engineer

Satrya- What gauge did you go with and why?

I found the gauge install directions for the OEM gauge and if I go with a mechanical gauge, I will follow these. Are there any gauge instructions out there for an electrical gauge (i.e.- wiring diagrams)? Just wondering what level of wiring is needed as the mechanical gauge install seems fairly simple.
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Old 03-26-2003, 01:10 PM   #7
satrya
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Quote:
Originally posted by YooperWRX
Thanks for the explanation satrya, you gots to trust a guy who's a Control Engineer
No problem. I didn't know anyone checks member profiles. If I may add, my opinions above are work related (in terms of transducers and diaprhagms), so it's possible that the automotive gauges are very different, rendering my remarks useless.

Quote:
What gauge did you go with and why?
Went with the least expensive of the autometer gauge, 2 5/8" mechanical boost gauge by Autogage, and made sure I used a good barbed brass t-fitting (1/8 Inch, iirc), and a 1/8 silicon vacuum hose to replace the small, kink-prone stock tubing. Reason: I simply wanted to have a sense of when the boost comes in while driving, and when it is under vacuum. Thus far, the gauge has always sat on the zero box when off, and seems to peak around the 14psi range, which is what a stock wrx should do, afaik. Didn't want to spend too much just for that purpose.

Quote:
I found the gauge install directions for the OEM gauge and if I go with a mechanical gauge, I will follow these. Are there any gauge instructions out there for an electrical gauge (i.e.- wiring diagrams)? Just wondering what level of wiring is needed as the mechanical gauge install seems fairly simple.
One rather obvious but useful tip for installing the tee near the stock bov is not to cut the original line, but to place a short new hose between the stock bov fitting and the t-fitting. That way, it's easier to maneuver/place the t-fitting. Not sure how much more complicated/simple the electrical wiring is. Getting a nice, clean ground is probably important.
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Old 07-09-2009, 01:11 AM   #8
hedalova
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can some body tell me the pressure bolt in the head valve for my subaru wrx 2.0 turbo step by step thanks if you have video o diagram better thanks
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Old 07-09-2009, 08:09 AM   #9
ekw
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Quote:
Originally Posted by hedalova View Post
can some body tell me the pressure bolt in the head valve for my subaru wrx 2.0 turbo step by step thanks if you have video o diagram better thanks
you're trying to hijack a six year old thread!!


and I find your question to be completely incomprehensible.

but I guess you were trying to search, and that's the best you could find?

you may want to start your own thread.
and please be more explicit w/ your question.

I am no boxer expert, but I have no idea what "the pressure bolt in the head valve" would be.
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Old 07-09-2009, 10:37 AM   #10
the suicidal eggroll
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Quote:
Originally Posted by ekw View Post
you're trying to hijack a six year old thread!!
Haha, I didn't even notice that. I saw the comment about the gauge pic thread being 7 pages long, and I was like...wait, mine is 109 pages, WTF?
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