air con mods?

[sniffy]

im just podering about something here guys, i hope you can help me out!

cold air makes your car go faster/more power...right? well, whats stoping me from rigging up the air con to cool the air going into the engine?

or am i missing something really obvious (which makes me look retarded)?

i know that it runs off the engine in the first place but it would chill the air well, and i would sacrafice 2% of power to get 10% more (as you know i just made up those figures!)

any input on this would be great!

[T0nyGTSt]

I don't think the law of thermodynamics works that way.

If you use 2% power to run the aircon, you'll only ever get 2% back by cooling at best (assuming 100% conversion efficiency).

Water spray the FMIC is the way to go.

T.

[51jay]

Yes.... but not at the dragstrip

[sniffy]

Originally posted by tlai909

I don't think the law of thermodynamics works that way.

If you use 2% power to run the aircon, you'll only ever get 2% back by cooling at best (assuming 100% conversion efficiency).

Water spray the FMIC is the way to go.

T.

so making the air a lot cooler isnt going to make much diference then?

also...um, another dumb question...FMIC, intercooler? whats the FM for?

[T0nyGTSt]

"Front Mount"

That big cheesy silver grin that fast Skylines have

T.

[sniffy]

no sh!t!!

hmmm..ok, another question:

ive seen black FMIC's, in theroy they should do the job better because it would disperse the heat better...true or false?

[Hicks]

Aluminium cools down very fast, the colour will make no diference.

Also, water sprays on the intercooler is pretty pointless. It makes no real noticable difference. Well thats my experience, and the tank emptys so quickly.

And the amount of power taken away by turning on the air con compresor is heaps, no matter how cool you get the air goin in you couldn't get that power back.

Just make a cold air intake with a section of tube leading in from behind a vent in the bumper up to the airfilter. If you have a fmic theres a seperate hole from the standard intercooler piping that is perfect.

[hippy]

was told that u lose much more power with the air con on than 2% ... u'd probably spend way much more money redoing all the air con anyways ... just get a bigger intercooler

[sniffy]

2% was just just a "ball park" figure...i guess my point is - if i could rig up something that the air con can run off an alternate power sorce, ie. batteries, would the performance be noticable, would it be a big gain or not much at all...im guessing it would be healthy for the engine aswell

[Cubes]

Then you need to drive the alternator to supply the power as a battery would go dead very quick driving an Aircon.

Its just like the Electronic Zet turbo charger.. what a rip off that was.

[Duncan]

Anyone know if the AC compressor runs all the time, some cars have a clutch that stops the compressor when you've got you foot flat.

[crooser]

for interest's sake...

once on a dyno, with a factory ecu we tested how much power was lost when the ac compressor was kicked in... 7rwkw

[Cubes]

only 7rwkw.. Mine feels like a hell of a lot more than that.

And when I rev her up the AC compressor sounds quite loud.

[SLY33]

Hicks, im with you on the water spray. waste of time!!!!!!!!!

I hear a lot of ppl say the ac sucks power. I seriously dont hardly notice mine when its on. Surely there is some sort of clutch system? with a redline of 7000plus, does the ac compressor really spin this fast when you redline the car?!! Surely the thing disengages or something, as that would be too much compressing!! where would all the pressure go?