why AC steals so much power ???
08-24-2003, 09:36 PM
#1
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why AC steals so much power ???
I hardy ever use AC , but in past few days it was just too humid , and I drove around town with AC on - the car felt sooooo sluggish !!!
my 93 Geo prizm Lsi (auto) with 118k feels the same AC on or off
the power loss on maxima is huge when compared to almost no power loss on 1.8L Geo ...
what is goin' on with 3.0 VQ ????
Nick.
my 93 Geo prizm Lsi (auto) with 118k feels the same AC on or off
the power loss on maxima is huge when compared to almost no power loss on 1.8L Geo ...
what is goin' on with 3.0 VQ ????
Nick.
08-24-2003, 09:58 PM
#3
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Join Date: May 2003
Posts: 30
Re: why AC steals so much power ???
Originally posted by nick
I hardy ever use AC , but in past few days it was just too humid , and I drove around town with AC on - the car felt sooooo sluggish !!!
my 93 Geo prizm Lsi (auto) with 118k feels the same AC on or off
the power loss on maxima is huge when compared to almost no power loss on 1.8L Geo ...
what is goin' on with 3.0 VQ ????
Nick.
I hardy ever use AC , but in past few days it was just too humid , and I drove around town with AC on - the car felt sooooo sluggish !!!
my 93 Geo prizm Lsi (auto) with 118k feels the same AC on or off
the power loss on maxima is huge when compared to almost no power loss on 1.8L Geo ...
what is goin' on with 3.0 VQ ????
Nick.
08-24-2003, 10:12 PM
#4
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Originally posted by iansw
Because a Geo has no power to lose.
Because a Geo has no power to lose.
the dang GEO weights 2200 lb and it's 1.8 liter is good for 115HP and 115 TQ - the car is very quick and nimble - I wish maxima was that nimble... plus the Toyota tranny always stays at the sweet power spot , unlike the maxima tranny which is always gear to high !!!
but seriously - there is a huge power loss with AC on VQ motor.
Nick
08-24-2003, 10:38 PM
#6
Originally posted by nick
I beg to differ !!!
the dang GEO weights 2200 lb and it's 1.8 liter is good for 115HP and 115 TQ - the car is very quick and nimble - I wish maxima was that nimble... plus the Toyota tranny always stays at the sweet power spot , unlike the maxima tranny which is always gear to high !!!
but seriously - there is a huge power loss with AC on VQ motor.
Nick
I beg to differ !!!
the dang GEO weights 2200 lb and it's 1.8 liter is good for 115HP and 115 TQ - the car is very quick and nimble - I wish maxima was that nimble... plus the Toyota tranny always stays at the sweet power spot , unlike the maxima tranny which is always gear to high !!!
but seriously - there is a huge power loss with AC on VQ motor.
Nick
that's why you should have got a 5 spd.
08-24-2003, 11:53 PM
#9
it may just be the humidity. I use my A/C most of the time here in Arizona where we have some dry heat, I don't feel a power loss it all. Well maybe just little but is not noticeable. I remember an old threat in which they said that the A/C takes 10HP when the compressor clutch is engaged.
08-25-2003, 06:35 AM
#16
My car felt a little sluggish when I turn on my AC. I was driving in midtown NYC on a summer afternoon with two of my friends. Around 160 pound each including me. I turn on the AC and my car is not moving the way as before. I have to give a bit more gas to move it.
When my AC is on manual at 65 degree, I don't feel that cool. But when is on automatic at 65 degree, I felt the chill alot quicker. I don't know what's wrong, just a curious thought.
Max 96 GLE
When my AC is on manual at 65 degree, I don't feel that cool. But when is on automatic at 65 degree, I felt the chill alot quicker. I don't know what's wrong, just a curious thought.
Max 96 GLE
08-25-2003, 07:39 AM
#19
Not DAVEB the parts guy
Join Date: Aug 2000
Posts: 8,555
I can feel the difference in performance with the AC on, but it's not a HUGE difference. The VQ just doesn't feel as smooth or as willing to rev. I've accidently left my AC on at the track and it slows me ~.1 and 1mph. Nothing huge, but it does slow you down somewhat. IU have a 5 speed so the initial lag probably doesn't feel as bad.
Dave
Dave
08-25-2003, 10:46 AM
#22
I would say a 4 cyl engine would feel more when the AC compressor engage...IMO depends if the car is properly maintained or needs a tune up. Of course is going to loose pwer due to the load on the engine. If you cahnge the pulley,you may see an improvement ,but the cooling when the car idles ,may not be as good. Look at Motorvate web site and check the UDP replacement.
08-25-2003, 06:49 PM
#23
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Originally posted by ivolley
Nick,
So.....when are we gonna start the conversion
just let me know!
Nick,
So.....when are we gonna start the conversion
just let me know!
right now I'm taking engine rebulilding at local college - looking forward to expand my limited automotive knowledge !!!
Just found out from edmunds.com that my 97 SE black on black fully loaded w/o cd changer with 125k is worth $7400 with auto tranny
with 5 speed is still worth 7200 !!!
hellllsss yeaaaa !!!!
BTW does anybody took engine rebuilding recently and used -Automotive engine rebuilding by James G. Hughes
and still have that book stashed in the closet - let me buy it !!!
back to the original thread - car is back to normal - trunk full of chit and huge toolboox plus 90' temps made such a difference.
Nick.
08-25-2003, 07:00 PM
#24
Originally posted by nick
as soonest I get all the parts , i also want the LSD .
right now I'm taking engine rebulilding at local college - looking forward to expand my limited automotive knowledge !!!
Just found out from edmunds.com that my 97 SE black on black fully loaded w/o cd changer with 125k is worth $7400 with auto tranny
with 5 speed is still worth 7200 !!!
hellllsss yeaaaa !!!!
BTW does anybody took engine rebuilding recently and used -Automotive engine rebuilding by James G. Hughes
and still have that book stashed in the closet - let me buy it !!!
back to the original thread - car is back to normal - trunk full of chit and huge toolboox plus 90' temps made such a difference.
Nick.
as soonest I get all the parts , i also want the LSD .
right now I'm taking engine rebulilding at local college - looking forward to expand my limited automotive knowledge !!!
Just found out from edmunds.com that my 97 SE black on black fully loaded w/o cd changer with 125k is worth $7400 with auto tranny
with 5 speed is still worth 7200 !!!
hellllsss yeaaaa !!!!
BTW does anybody took engine rebuilding recently and used -Automotive engine rebuilding by James G. Hughes
and still have that book stashed in the closet - let me buy it !!!
back to the original thread - car is back to normal - trunk full of chit and huge toolboox plus 90' temps made such a difference.
Nick.
08-25-2003, 11:05 PM
#27
Ah no. The AC compressor is a heat pump yes, but the reason is robs power is because nothing is for free. It takes energy to run the compessor(ie.. about 5-6 hp).
Originally posted by broaner22
Is it me or is everyone forgeting the principle of a compressor. It creates cool by getting hot. So, since its in the engine bay it makes the area hotter, thus robbing power.
Is it me or is everyone forgeting the principle of a compressor. It creates cool by getting hot. So, since its in the engine bay it makes the area hotter, thus robbing power.
08-26-2003, 07:18 AM
#28
Originally posted by Dave B
I can feel the difference in performance with the AC on, but it's not a HUGE difference. The VQ just doesn't feel as smooth or as willing to rev. I've accidently left my AC on at the track and it slows me ~.1 and 1mph. Nothing huge, but it does slow you down somewhat. IU have a 5 speed so the initial lag probably doesn't feel as bad.
Dave
I can feel the difference in performance with the AC on, but it's not a HUGE difference. The VQ just doesn't feel as smooth or as willing to rev. I've accidently left my AC on at the track and it slows me ~.1 and 1mph. Nothing huge, but it does slow you down somewhat. IU have a 5 speed so the initial lag probably doesn't feel as bad.
Dave
08-26-2003, 07:48 AM
#29
Not DAVEB the parts guy
Join Date: Aug 2000
Posts: 8,555
Originally posted by ejj
The ECU disengages the clutch in the AC pully when at WOT. It shouldn't make any difference at the track.
The ECU disengages the clutch in the AC pully when at WOT. It shouldn't make any difference at the track.
Has this been proven or has it just been assumed? The reason I ask is because my Max blows cold air at WOT. On my old Z28, you could actually feel the compressor disengage at 4000rpms and the air went from icey to warm and humid and once you let off and the rpms came back around 4000rpms, you felt it kick on again.
Dave
08-26-2003, 09:15 AM
#30
My maxima will blow cold air for a few min after turning off the AC(but keeping the fan on). Try it. Since you aren't(or shouldn't be 
) at wot for more than a few seconds anyway, that's what you are experiencing
) at wot for more than a few seconds anyway, that's what you are experiencing
Originally posted by Dave B
Has this been proven or has it just been assumed? The reason I ask is because my Max blows cold air at WOT. On my old Z28, you could actually feel the compressor disengage at 4000rpms and the air went from icey to warm and humid and once you let off and the rpms came back around 4000rpms, you felt it kick on again.
Dave
Has this been proven or has it just been assumed? The reason I ask is because my Max blows cold air at WOT. On my old Z28, you could actually feel the compressor disengage at 4000rpms and the air went from icey to warm and humid and once you let off and the rpms came back around 4000rpms, you felt it kick on again.
Dave
08-26-2003, 09:23 AM
#31
Originally posted by Dave B
Has this been proven or has it just been assumed? The reason I ask is because my Max blows cold air at WOT. On my old Z28, you could actually feel the compressor disengage at 4000rpms and the air went from icey to warm and humid and once you let off and the rpms came back around 4000rpms, you felt it kick on again.
Dave
Has this been proven or has it just been assumed? The reason I ask is because my Max blows cold air at WOT. On my old Z28, you could actually feel the compressor disengage at 4000rpms and the air went from icey to warm and humid and once you let off and the rpms came back around 4000rpms, you felt it kick on again.
Dave
Mine does that too. Usually after 5K - 5.5K it's when the humid air comes out. But If I floor it and don't rev up that high I still get very cold air.
08-26-2003, 10:42 AM
#32
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Well this is what i know. It might either be the weight, the heat generated or the drain on the engine of the AC system, but i know without it the car feels faster at WOT and at other throttle. Basically is just hurts the car's performance in some way or another.
09-04-2003, 10:43 AM
#34
Originally Posted by Dev
i don't feel any power loss with a/c on...
and also, if you're going WOT, the a/c compressor shuts off so you should still be running at full power
and also, if you're going WOT, the a/c compressor shuts off so you should still be running at full power
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