HellsLegion said:
89+ Mustangs have a switch in the a/c that temporarily disengages the compressor clutch at WOT, effectively stopping the parasitic drag. Most newer sports cars have something similar as well.
AC delete
- Thread starter supramacist
- Start date
89+ Mustangs have a switch in the a/c that temporarily disengages the compressor clutch at WOT, effectively stopping the parasitic drag. Most newer sports cars have something similar as well.
The ac has never been a problem. It is just general lag you get when you use it nothing out of the ordinary. Car runs good with it blowing too. You know you are into the peddle alot more to get it there though. So no..., It's just 1 thing I will never have to worry about again.
I''m going to have to break out the tsrm on this ac project. I see the heater device in front of the the rad. I just want to make certain I am not supposed to cork these lose ends when I pull it. I also want to be certain I am not removing anything I don't have to. I wish this thing was clean and not all 135k'd up. I'm the 3rd owner and the 2nd did a number on the cars' engine. The rest of it is normal and somewhat clean.
Fwiw a car is almost always more efficient with AC than with windows open, at least at speeds above 40 mph. Plus it's not fun to be sweating in slow moving traffic. Not to mention the next owner may want AC so at least bag it up and keep it. Your car, your call though. What's that? You'll never sell the car? OK, if you say so 
I don't know about later model years but my 87 doesn't de-clutch the compressor at WOT. I know because a boost pressure AC cutoff switch was one of the first mods I did, along with making the fans able to run after it was shut off. A quick look at my EWD shows there is no way for the AC system to "know" what the engine is doing. There's a single output from the AC amplifier to the ECU for idle up but that's a one way street.
I don't know about later model years but my 87 doesn't de-clutch the compressor at WOT. I know because a boost pressure AC cutoff switch was one of the first mods I did, along with making the fans able to run after it was shut off. A quick look at my EWD shows there is no way for the AC system to "know" what the engine is doing. There's a single output from the AC amplifier to the ECU for idle up but that's a one way street.
jetjock said:
perhaps it was on later model years. ('89+?) i'm almost positive that i remember GrimJack mentioning this several times. i could be wrong though. it certainly wouldn't be the first time. haha
-shaeff
Not questioning you shaeff my man, only offering up what I know about the earlier years. I'll look at the online EWD for the later year but since it seems to have mistakes I'll need to take it with a grain of salt.
Supramacist, if you are worried about the A/C robbing power you can always just cut the A/C belt. That way if you decide to sell your car (not saying you will or anything.) you can just replace the belt instead of the hastle of putting everything back.
I don't think that is the way to go about it slideways. LOL. I'm a bit surprised to hear you say something like that. I know we get some of the same ideas with lowes and all but cutting the belt isn't going to get it done.
I say I won't ever sell the car because I won't ever get enough money for all that has been done.
Everyones making good points with the windows up, with ac. Maybe I am just making busy work for myself. I'm not sure. I'm not planning on this car being a DD but I want it to be able to be a solid back up that I know runs.
I want to be able to take it to the local track and have fun in it. The bottom line is what? I get weight reduced by maybe 40lbs. That and I don't have to get mad every time the buttons for the AC aren't locking in propperly. I may have absolutely no business under the hood of this thing but I won't know till I fix it. If I'm goiing to turn the wrenches...., I'm gonna turn em my way. I am seriously thinking of a rear seat delete as well. Cheapest way to get a 2 seater.
I say I won't ever sell the car because I won't ever get enough money for all that has been done.
Everyones making good points with the windows up, with ac. Maybe I am just making busy work for myself. I'm not sure. I'm not planning on this car being a DD but I want it to be able to be a solid back up that I know runs.
I want to be able to take it to the local track and have fun in it. The bottom line is what? I get weight reduced by maybe 40lbs. That and I don't have to get mad every time the buttons for the AC aren't locking in propperly. I may have absolutely no business under the hood of this thing but I won't know till I fix it. If I'm goiing to turn the wrenches...., I'm gonna turn em my way. I am seriously thinking of a rear seat delete as well. Cheapest way to get a 2 seater.
dont take out the rear seat... i regretted it... It takes away insulation for both noise and temperature. Plus it looks ugly. Not to mention why take weight away from the back of the car?
The ac compressor, the condenser, and the lines should save a few pounds if thats what youre going for. Its always a plus to have the AC on tap when you need it though, and in a car as heavy as ours whats a few extra lbs.
I removed mine only because i took out the motor and didnt feel it was worth putting everything back in and paying to have r12 put in it and new oil and a new evap dryer or whatever and all that. In that case, it WAS worth the few extra pounds off the weight. And if youre concerned with drag, dont use the ac when you want the engine to have more power. It doesnt drain much at all if anything when the ac isnt operating.
The ac compressor, the condenser, and the lines should save a few pounds if thats what youre going for. Its always a plus to have the AC on tap when you need it though, and in a car as heavy as ours whats a few extra lbs.
I removed mine only because i took out the motor and didnt feel it was worth putting everything back in and paying to have r12 put in it and new oil and a new evap dryer or whatever and all that. In that case, it WAS worth the few extra pounds off the weight. And if youre concerned with drag, dont use the ac when you want the engine to have more power. It doesnt drain much at all if anything when the ac isnt operating.
jetjock said:Fwiw a car is almost always more efficient with AC than with windows open, at least at speeds above 40 mph. Plus it's not fun to be sweating in slow moving traffic. Not to mention the next owner may want AC so at least bag it up and keep it. Your car, your call though. What's that? You'll never sell the car? OK, if you say so
I don't know about later model years but my 87 doesn't de-clutch the compressor at WOT. I know because a boost pressure AC cutoff switch was one of the first mods I did, along with making the fans able to run after it was shut off. A quick look at my EWD shows there is no way for the AC system to "know" what the engine is doing. There's a single output from the AC amplifier to the ECU for idle up but that's a one way street.
I remember something on Myth Busters here lately where they tested this and I was thinking that having the AC on used more gas then having the windows open and they did there testing at around 50 mph if I remember right.
supramacist said:
I think you need to do a better diagnosis than the AC system then. You would see if you just quickly removed the belt that its most likely not the problem.
supramacist said:
If it is going to mostly be a track car then I say pull the whole A/C system. Mabey I misunderstood your questions but I thought you didn't want the A/C system to be a parisite on the motor. I sugested cutting the belt because it is the easiest to remove/ replace if you decide to get the A/C back. If you are removing thing like that (parasitic) I would do an electric fan while I was at it. The only reason why I am removing the system is because I am getting the motor rebuilt.(I am sending in just the block and head.) That and I don't care if it stays or goes, so it is going. I may regret it after I move to Arizona but I should have a DD by then.
I live in arizona and never had working AC in my supra since i bought it. I eventually pulled the ac out just because i didnt want to retrofit it. Was one of the easier things ive done ripping that junk out. It didnt work anyways so i didnt bother to save it.
I honestly dont mind living without AC anyways, again i never had it. Also, Im used to riding motorcycles in this heat so the car really isnt that bad with those Huge windows. When people ask me for rides i remind them i dont have ac, they quickly find another taxi ;p
Oh, it is my daily driver.
I honestly dont mind living without AC anyways, again i never had it. Also, Im used to riding motorcycles in this heat so the car really isnt that bad with those Huge windows. When people ask me for rides i remind them i dont have ac, they quickly find another taxi ;p
Oh, it is my daily driver.
^ Sounds just like me. A/C doesn't work so I would rather remove it than fix/ retrofit it. It is just a matter of personal tastes I guess.
Nope...., I'm doing it strictly to horse up my NA. No disrespect intended slideways. I thought that belt ran something else as well. But I'm only going to pull what I know I will not need I'll figure the rest out later. Long live Supra.
I thought i read somewhere that if the ac is Off theres basically no noticeable drag on the motor?