A/C Compressor cut out verified
08-04-2003, 11:01 AM
#1
Thread Starter
A/C Compressor cut out verified
I did some searching but never found a definite answer to the AC compressor cut off question, so I tested it recently.
At least on my MY00 the compressor cuts off at 7700 rpm and cuts back on at 7300 rpm, regardless of throttle position.
Obviously this is a safety setting and not performance related.
My plan is to tie it to the VTEC output so the compressor cuts off anytime VTEC is engaged. That way it cuts out a little sooner but only if the engine is under load, otherwise the 7700 rpm cut-out is still there.
If anyone is interested, you can connect the coil of a low-current relay to the VTEC wire on the ECM (B-12, Grn/Yel) and ground, then cut the compressor signal wire (ECM A-27 Blu/Red) and wire it through the normally-closed contacts of the relay. Whenever VTEC is engaged the relay will activate, opening the signal wire from the AC panel to the ECM which will turn off the compressor.
At least on my MY00 the compressor cuts off at 7700 rpm and cuts back on at 7300 rpm, regardless of throttle position.
Obviously this is a safety setting and not performance related.
My plan is to tie it to the VTEC output so the compressor cuts off anytime VTEC is engaged. That way it cuts out a little sooner but only if the engine is under load, otherwise the 7700 rpm cut-out is still there.
If anyone is interested, you can connect the coil of a low-current relay to the VTEC wire on the ECM (B-12, Grn/Yel) and ground, then cut the compressor signal wire (ECM A-27 Blu/Red) and wire it through the normally-closed contacts of the relay. Whenever VTEC is engaged the relay will activate, opening the signal wire from the AC panel to the ECM which will turn off the compressor.
08-04-2003, 08:00 PM
#2
Join Date: Mar 2003
Location: San Fernando Valley, CA
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I've been in quite a few cars, but i must say the S2000 A/C is the most noisy A/C I have seen on a modern Japanese car.
All the hissing and other weird noises would irritate me more if it weren't for the fact it does pump out lots of cold air in the California heat.
All the hissing and other weird noises would irritate me more if it weren't for the fact it does pump out lots of cold air in the California heat.
08-05-2003, 03:11 AM
#3
Thanks for the information. I can see why the cut-out would be based on rpm, but also doing it on throttle position would have been beneficial. A simple WOT cut-out would have insured the driver is getting the power applied where he wants it.. I have learned that I must hit the switch in order to accomplish that.
08-05-2003, 05:55 PM
#4
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Originally posted by cdelena
Thanks for the information. I can see why the cut-out would be based on rpm, but also doing it on throttle position would have been beneficial. A simple WOT cut-out would have insured the driver is getting the power applied where he wants it.. I have learned that I must hit the switch in order to accomplish that.
Thanks for the information. I can see why the cut-out would be based on rpm, but also doing it on throttle position would have been beneficial. A simple WOT cut-out would have insured the driver is getting the power applied where he wants it.. I have learned that I must hit the switch in order to accomplish that.
08-11-2003, 08:13 PM
#6
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As for working for and on Honda/Acura for awhile....Honda has the A/C configured to cut off whenever WOT is applied and also quick opening of the throttle. Go out under the hood of the car with the A/C running. Quickly open and close the throttle with your hand and you will notice the compressor and fans cut out automatically. There is no need to really mod the A/C circuit in this way.
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