feature request: Ac shut off if CLT exceeds temp

[sheek]

hi just wondering if you can add this feature to disengage the ac compressor if clt exceeds a set limit. thank you.

[kjones6039]

I think this could be accomplished with an existing output without the addition of another feature, couldn't it?

Ken

[sheek]

i dunno im using nitrous in connected to my switch input and injector E engages the compressor in my ac settings.

i dont see what im looking for in there

[kjones6039]

Well I could be wrong, of course, but I thought MS3 had several more outputs than MS2.......

Ken

[Matt Cramer]

On the 1.4 code, you could use a LOOP function set to the input active AND CLT < whatever.

[sheek]

how would i do that?

[sheek]

nitrous in is set to my ac request signal and injector E kicks on the ac clutch. so how would i use the loop function with my existing setup? ideally under ac compressor shut off where it has tps vss etc a field can be added called coolant. that is what i was thinking.

[piledriver]

You hopefully can also cut the compressor out above a certain engine load...

Will be going there the coming weekend, is there an existing how-to//example on this subject?

The AC feed-forward idle up and load based cutout are ms3-pro/ms3-pnp advertised features, so there must be some documentation, I'll go dig.

[piledriver]

I couldn't find how to set up those advertised features in the manuals or anything of much use in the forums.

I'll try and put together a how-to when I try it myself.

Suggestions/links welcome.

[ap67et10]

On the AC setup I just built for my 64 f100 I used both AC high side pressure transducer and coolant temp to shut off the compressor. What I do for that is actually quite simple, but it can cause a slightly high idle at times if it is commanding AC idle up, but clutch is disengaged for coolant too hot or high pressure too high. The way I did it is this: I took a standard 5 pin relay and hooked the ground output from MS that goes to the AC compressor relay (your injector E output) to pin 30 of the relay. Then the other side of that ouput that actually attaches to the AC compressor relay goes to pin 87a on the 5 pin relay. This means that when the relay is not engaged there is continuity from MS to the compressor clutch relay. So if AC request is turned on the compressor comes on. I then hooked 85 to 12v switched and 86 to a generic output from MS. I used the programmable outputs to set the parameters for >210 coolant or 370psi on high side of AC the output is activated. This just causes relay engagement which simply interupts the AC clutch signal and shuts off the AC until coolant temp comes down or high side comes down. I do agree having it built into the code would make it much easier and allow me to free up and output pin. But it does work this way.



Andrew