Air Conditioning switch no longer works, megasquirt PNP? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-08-2008, 04:50 PM   #1
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Default Air Conditioning switch no longer works, megasquirt PNP?

Hey guys, I have another problem. My air conditioning compressor and secondary fan will not cut off! I have pulled the relay and of course that cuts the air conditioning compressor off, but i'm afraid that the culprit could be my megasquirt ecu. To understand the situation, my condensor runs constantly, even with the fan **** turn off and the a/c button off as well...

I heard that the A/C is ecu controlled; but doesn't the a/c switch itself toggle the power circuit to the condensor/fans?
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Old 06-08-2008, 04:52 PM   #2
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Default Megasquirt PNP Spark timing maps...

I've been working on my fuel maps and I got the car to run a clean 11.5-12.2 air/fuel ratio throughout the rpm band at 12 psi. How does the stock spark timing map do, is it extremely conservative and is there any room for more power? I considered running megasquirt pnp closed loop/static timing at 14 degrees BTDC with 93 octane? Suggestions, any body got some good spark maps for a 12 psi 97' Miata?
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Old 06-08-2008, 04:56 PM   #3
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I would not consider touching your spark map unless you have an extremely good knock sensor or access to a load-bearing dynamometer.
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Old 06-08-2008, 05:09 PM   #4
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you should set the static timing as reccomended in the instructions. Then, you wont have to mess with it anymore.
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Old 06-09-2008, 10:26 AM   #5
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Quote:
Originally Posted by Cody Strife View Post
I've been working on my fuel maps and I got the car to run a clean 11.5-12.2 air/fuel ratio throughout the rpm band at 12 psi. How does the stock spark timing map do, is it extremely conservative and is there any room for more power? I considered running megasquirt pnp closed loop/static timing at 14 degrees BTDC with 93 octane? Suggestions, any body got some good spark maps for a 12 psi 97' Miata?
The spark map is indeed conservative, deliberately so. It's meant to get the car up and running before you take it to a dyno, not for maximum power. I don't advise fiddling with the map without dyno tuning.

Check the voltage at the AC button. It should be around 12 volts with the AC off and 0 with the AC on.
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