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Old 08-31-2015, 07:47 PM   #3441
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Real time baro correction, like if you drive up a mountain.
External GM 3 bar MAP sensor. You want the extra boost capability and it frees up the internal one for baro correction.

--Ian
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Old 08-31-2015, 07:48 PM   #3442
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I like what you are saying about the loss of resolution if you are not using the whole range. I believe that package also comes in .5 bar increments? So 3 and 3.5 should be out there somewhere.

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External GM 3 bar MAP sensor. You want the extra boost capability and it frees up the internal one for baro correction.
That sounds like the way to go TBH.
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Old 08-31-2015, 07:48 PM   #3443
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<p>But what if I want more than 3bar?</p>
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Old 08-31-2015, 07:49 PM   #3444
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You shouldn't have bought miata
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Old 08-31-2015, 07:50 PM   #3445
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You shouldn't have bought miata
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Old 08-31-2015, 07:53 PM   #3446
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<p>Whats the price of the 3bar Ian?</p>
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Old 08-31-2015, 07:53 PM   #3447
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I like what you are saying about the loss of resolution if you are not using the whole range. I believe that package also comes in .5 bar increments? So 3 and 3.5 should be out there somewhere.
No. There are assorted sensors available in that (or similar) package, but it's not as simple as a .5 bar increment. I bought a bunch a while back for my manifold pressure testing. IIRC, there's the 2.5 bar we all use, the 3 bar that's in the GM sensor (but it's a surface mount part), then I think the next step is a 5 bar (again, surface mount), and then a 7 bar.

There are a bunch of others too, but many of them are gauge sensors, not absolute.

The sensors aren't particularly expensive if you buy 'em from Mouser, so IMHO it makes sense just buy the one that matches your intended boost level and upgrade later if you need it.

3 bar gives you tranny-destroying levels of torque, so I don't really see a need to go higher than that.

--Ian
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Old 08-31-2015, 07:54 PM   #3448
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<p>I'm doing surface mount stuff. Thats what the 4-bar is.</p>
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Old 08-31-2015, 07:55 PM   #3449
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The one from diyautotune is $64 in its engine-bay-mountable package.

MAP - GM style 3 Bar MAP Sensor DIYAutoTune.com

The chip that's inside it is roughly half that price.

--Ian
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Old 08-31-2015, 07:56 PM   #3450
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3 bar = roughly 27PSI of bewst, depending on elevation.

Use this, then you don't need a board, right?

MAP - GM style 3 Bar MAP Sensor DIYAutoTune.com

I'd like the short run for MAP, no more passing through the firewall. 4bar baro sensor is madness, unless you drive a yellow sub like me.

edit: $13?

http://www.ebay.com/itm/NEW-GM-STYLE...-/171124019819
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Old 08-31-2015, 07:57 PM   #3451
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<p>You think I'm kidding about running more than 27psi....</p>
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Old 08-31-2015, 07:57 PM   #3452
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Maybe I should stick with the 2.5, it'll keep me from ruining my life
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Old 08-31-2015, 07:58 PM   #3453
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I'll have to look up which parts were which when I get home.

--Ian
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Old 08-31-2015, 07:58 PM   #3454
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<p>The 4 bar sensors are $10 a piece. And the board is like &lt;$2</p>
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Old 08-31-2015, 08:00 PM   #3455
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Quote:
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You think I'm kidding about running more than 27psi....
Prove it!!

3 bar in the engine bay is $13, and you don't have to make it
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Old 08-31-2015, 08:01 PM   #3456
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Quote:
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3 bar = roughly 27PSI of bewst, depending on elevation.
That's the thing, I'm coastal. I think I live at like 50' above sea level. Nice dense cool tasty air up in here. I'm interested in realtime baro so when I drive away from the coast I won't have issues. It'll take me less than 15 minutes to get to 1,400' and I feel like that's a legitimate concern.
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Old 08-31-2015, 08:02 PM   #3457
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<p>damn, 13 is a good price.</p><p>Not as cool though. And I wanted to make my own board.</p>
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Old 08-31-2015, 08:04 PM   #3458
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If I'm not mistaken, getting the GM 3 bar to work is probably as easy as mounting it somewhere, then getting it 12V SG and a signal wire back to the MS. Then, unplug the stock 2.5 vac line and use it for baro.

All for $13 bucks, lol. Wonder if the cheap ebay map sensors are as bad as the coils, I bet they aren't.

I also wonder if there would be any advantage to having the map sensor be literally inches from the intake manifold, sure having a 5ft vac line is not the best thing ever, right?
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Old 08-31-2015, 08:05 PM   #3459
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<p>5V. Not 12V.</p><p>3-Bar MAP sensor</p>
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Old 08-31-2015, 08:06 PM   #3460
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<p>I need to redo my megasquirt without the stupid harness in case thing. I have no ******* room for add-ons</p>
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