Anyone running AC with an aftermarket/NO Ecu? If so, how are you triggering the ECU? How hard would it be to try and run AC without an ECU, what is involved?
#122604, "RE: AC with aftermarket ECU" In response to Reply # 0
Ok maybe I am wrong here, but here is what I thought. Is that the AC compressor is engaged through the switch, the relay....and that activates a solenoid that engages the compressor. I didnt think the ECU had anyhting to do with it. Can someone approve or disprove this??
#122605, "RE: AC with aftermarket ECU" In response to Reply # 1
The ECU does control the A/C engagement. NO idea how to get around it with an aftermarket ECU other than leaving the factory ECU there taking inputs from all the sensors and left the aftermarket control the timing and fuel.
#122606, "RE: AC with aftermarket ECU" In response to Reply # 2
how often does it cycle? Presumable you could program a PIC to control the relay and just cycle it. Does the ECU make the A/C cut when you increase throttle? That'd be a nice thing to program into it if you went this way.
Representing the Central Cali chapter of 2GNT! (I think I'm the only member )
#122608, "RE: AC with aftermarket ECU" In response to Reply # 4
That shouldn't be too difficult to program, tap into the temp sensor and TPS (I'm still going to push for killing the A/C when you hit the trottle) and let it run full out under normal circumstances.
Representing the Central Cali chapter of 2GNT! (I think I'm the only member )
#122611, "RE: AC with aftermarket ECU" In response to Reply # 6 Aug-28-06 09:18 AM by cougar694u
Originally posted by DR1665 What "aftermarket" ECU are we talking about? As far as I knew, there was only one - from AFX - and it controls AC just fine.
Perhaps he's using either MSnS as full standalone, or the other one I forget the name of.
**EDIT** There's a low pressure switch that typically triggers when to kick on the A/C. If you were to run a relay that only armed when the A/C was on and when the low pressure switch opened (or closed), you could kick the A/C compressor on or off.
The next step would be to set up a hard acceleration switch (or output from the ECU) that turned the A/C off above like 75% throttle or something.
~Luke Facebook 1969 Cougar - 11.91 - 380HP 2007 GSXR 750 1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot
#122612, "RE: AC with aftermarket ECU" In response to Reply # 8
All you have to do is engage the clutch. One wire, 12v+. Easy enough.
Fuck low pressure switches, PICs, and the orange light on/off cycle.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#122614, "RE: AC with aftermarket ECU" In response to Reply # 10
It is *anyway*. The ECU will turn it off if the pressure switch goes too low. other than that, if the button is on, the compressor is engaged. It doesn't have a duty cycle.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#122615, "RE: AC with aftermarket ECU" In response to Reply # 11
The only downfall I see to have it run all the time is the evaporator will freeze up, at least it did when I turned my low pressure switch down too far. Of course, all you have to do is turn the fan on high for a few seconds and it thaws.
~Luke Facebook 1969 Cougar - 11.91 - 380HP 2007 GSXR 750 1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot
#122617, "RE: AC with aftermarket ECU" In response to Reply # 13 Aug-29-06 02:03 PM by DarkOne
Originally posted by Chamuko you sure its on ALL the time? I can distinctly hear it clicking on and off.
it depends. the GS has two modes - a low and a high. orange light is low, and it clicks on and off. Green is high, it's always on. You may hear the condensor fan click on and off, but the compressor, AFAIK, is always engaged when the light is green.
Easy enough to verify - turn the AC on and watch the compressor. You should be able to see it engage and disengage the clutch, if it does.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#122618, "RE: AC with aftermarket ECU" In response to Reply # 14
Originally posted by DarkOne
Originally posted by Chamuko you sure its on ALL the time? I can distinctly hear it clicking on and off.
it depends. the GS has two modes - a low and a high. orange light is low, and it clicks on and off. Green is high, it's always on. You may hear the condensor fan click on and off, but the compressor, AFAIK, is always engaged when the light is green. Easy enough to verify - turn the AC on and watch the compressor. You should be able to see it engage and disengage the clutch, if it does.
I have. And I know what the fans sound like compared to the compressor, c'mon Dino ( helps that they arnt the oem).
Compressor sounds like the AT use to sound, like a ratchety sound.
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FOUNDER of the Central Cali chapter of 2GNT! (I got kicked out after I refused to go Cow tiping) - Hehehe you know who this is for
#122621, "RE: AC with aftermarket ECU" In response to Reply # 17
My 95 RS has the dual position setting. I didn't remember my 99 GS having it, so I was somewhat pleased. I assumed it's like MAX A/C vs NORM A/C in other vehicles.
~Luke Facebook 1969 Cougar - 11.91 - 380HP 2007 GSXR 750 1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot
#122622, "RE: AC with aftermarket ECU" In response to Reply # 9
Originally posted by DarkOne All you have to do is engage the clutch. One wire, 12v+. Easy enough. Fuck low pressure switches, PICs, and the orange light on/off cycle.
More details please, what do you mean engage the clutch?
#122623, "RE: AC with aftermarket ECU" In response to Reply # 19 Aug-29-06 02:30 AM by cougar694u
Originally posted by Chamuko you sure its on ALL the time? I can distinctly hear it clicking on and off.
It cycles, but if you have it on max a/c with the fan on high, chances are it will be on 100% of the time. And don't forget, we're in TX, it's been 99+ for several straight weeks with no rain here in SA.
Originally posted by rhui
Originally posted by DarkOne All you have to do is engage the clutch. One wire, 12v+. Easy enough. Fuck low pressure switches, PICs, and the orange light on/off cycle.
More details please, what do you mean engage the clutch?
The A/C clutch? You know, that allows the belt to turn withouth turning the A/C compressor?
~Luke Facebook 1969 Cougar - 11.91 - 380HP 2007 GSXR 750 1999 OZ - SOLD - 15.26 NA - 14.71 on 75 shot
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