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Old 03-02-2011, 01:00 AM   #1
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Default Help deciding on management for m45 1994 1.8

Okay, new to the fuel control world, never had a boosted gas vehicle before.

Specs will be as follows.

1994 1.8 stock motor with cold side m45 8-10 psi
Header, 330cc injectors.

Everything else is still undecided. I would like some ideas on what to run ecu, piggyback, etc. that will still get me through a CA smog check, all accessories functional, and basically plug in ready (not a wiring genius) Pretty tempted to just run a powercard but I hear a lot of negative about them. Any other thoughts, pros and cons of different systems????
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Old 03-02-2011, 02:11 AM   #2
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not from the people's republic of cali but i'm pretty sure anything aftermarket has to have that freaking CARB sticker.
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Old 03-02-2011, 09:32 AM   #3
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I standalone will still get you past CA smog checks. A 94 is still ODB-I, so there's no reason you can't replace the ECU with a Megasquirt or alike.
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Old 03-02-2011, 11:10 AM   #4
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I was just reading in another thread that none of the standalones operate the CEL or work with A/C. Was this old or bad info? Thats why i was thinking piggyback.
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Old 03-02-2011, 11:10 AM   #5
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The MS was my first choice til I read that info.
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Old 03-02-2011, 11:52 AM   #6
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Old info.

You can run the A/C no problem. The CEL is disabled since the ECU won't send to it, you could potentially light it up on a timer with a simple relay switch, but it lights up like normal on start IIRC so it's no matter if it never shows a code.
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Old 03-02-2011, 12:16 PM   #7
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my mspnp works great with ac...
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Old 03-02-2011, 01:33 PM   #8
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Aircon is easy, and has been covered in some depth here: https://www.miataturbo.net/forum/t20954/ Additionally, if you buy a Megasquirt PnP it natively supports A/C, and it would be easily integrated into a DIYPnP (which is preferable from an emissions standpoint, owing to the greater injector resolution)

The check engine light is not natively supported, however it would be relatively easy to fake. I honestly can't recall what its exact behavior is, I believe it's something to the effect of "Always on when engine not running, then on for 2 seconds after engine start" or something to that effect. Simulating this behavior would require a small amount of hackery- I'd start by wiring a relay driver output of the ECU to turn on whenever RPM > 500, and then use that output to drive a delay circuit which in turn drives the light. You could use circuit #2 in this illustration, but with the N.C. rather than N.O. contact on the relay closing the CEL circuit: http://home.cogeco.ca/~rpaisley4/LM555PowerDelay.GIF
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Old 03-02-2011, 02:30 PM   #9
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if building a diypnp, its incredibly simple. should be as simple as using an output relay ans setting up the parameters...I'm pretty sure you can make it active with a timer.
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