a/c?

[UrbanRedneckKid]

Exactly. Put a scanner on an obd2 model, watch the engine load percentage when the clutch engages.

My 98 2.5 had 55% engine load at idle, and my 99 5.0 has 20% load at idle.

 

[LIMA BEAN]

You do understand that any performance gains to be had by electric forced induction are negated by the extra drag from the alternator while it is producing the power to run the fan, right?


Also, electric forced induction just doesn't work. It has been proven often and thoroughly enough that believing that it will work should be ground for the immediate issue of a bicycle helmet and a sign.

Will the aforementioned helmet have one of those cool little propellers on top of it? That might be kinda cool, you know in case theres chicks around.

 

[upnsmoke]

it takes about 45hp to run the A/C compressor.

Exactly. Put a scanner on an obd2 model, watch the engine load percentage when the clutch engages.

My 98 2.5 had 55% engine load at idle, and my 99 5.0 has 20% load at idle.

I hope you're kidding.

 

[UrbanRedneckKid]

Do the research. It takes 6-15hp to spin the compressor at idle, or any steady rpm. There is around a 45hp loss during the increasing of the engine/ compressor speed, aka acceleration.

Those are hypothetical average number, because it all depends on the size of the compressor, ambient air temp, size of engine, static Freon charge weight, flywheel and balancer mass, humidity, range between high and low pressure switches, pulley ratios, blah blah blah.

 

[upnsmoke]

You obviously know more about it than me. I'll have to research it a little. 5-15hp sounds reasonable, but at 45hp you are making like 120k BTUs. That is probably enough to run ACs for 5 cars. All that heat made by the work done there would have to go somewhere. Also, you would almost have to feel that kind of a power loss by the seat of your pants on a low performance or small displacement engine. Having driven such vehicles, I just can't believe that there was such a loss of power with the AC on. I'm not saying your wrong, just that it doesn't make sense to me.

 

[tempforce]

so when i turn on the a/c in a 56 hp diesel ranger it will kill the engine??

 

[97RangerXLT]

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1944982

Some good discussion in here. I would agree with the consensus of 3-4 hp.

one guy makes a good point, when your car is idling, it is maybe putting out a fraction of its horsepower, and the a/c still runs. No way any small engine will put out over 45 hp at idle.

AJ

 

[adsm08]

so when i turn on the a/c in a 56 hp diesel ranger it will kill the engine??

It can. That was acutally a problem on the Tempos, stalling while decelerating. They figured out that the load of the A/C compressor engaging at idle could kill the engine, so they re-wired them to stay off if the brakes were on.

 

[LIMA BEAN]

E=mc^2

 

[Mac]

Think a little deeper. How much does a 2.5 put out at ldle, probably close to 20-25hp if that much. 55% of that puts it down close to 10.
Dave