Effect of AC on engine output?

Effect of AC on engine output?

Author
Discussion

andygtt

8,305 posts

209 months

Wednesday 21st July 2010
quotequote all
Adrian W said:
I'm sure that Sundance offered to pay to prove a point, but unless i am completely nuts, some posts have been deleted in this thread.
Im going with completely nuts smile

wessexrfc

4,323 posts

131 months

Wednesday 21st July 2010
quotequote all
andygtt said:
Well to find out what the power loss really is (and for absolutelly no other reason at all wink ) I have booked my car for a RR session next week... so Im taking donations to help with the cost biggrin
Any refrigeration/ac system will increase duty as pressure and tempreture rise, and so therefore the % of power taken will rise accordingly. Just to throw a theoretical spanner in the works, doing a RR with a/c on/off will tell you the power taken to drive the a/c at a specific temp, ie the cabin and outside temp. If you were to then move all the kit outside on a hot day, lets say 28 degrees with the car in direct sunlight etc, the duty on the compressor will be higher, pedantic I know, but if an experiment is worth doing. wink

andygtt

8,305 posts

209 months

Wednesday 21st July 2010
quotequote all
last time i was on the RR the dyno air temp reading was 30deg so pretty realistic for a UK hot summer day lol

FUNKSTER UK

765 posts

147 months

Wednesday 21st July 2010
quotequote all
Getting bored with this!

If it's hot I turn it on.
If it's not I don't.

wavey

TuxMan

8,960 posts

183 months

Wednesday 21st July 2010
quotequote all
FUNKSTER UK said:
Getting bored with this!

If it's hot I turn it on.
If it's not I don't.

wavey
biglaughbiglaughbiglaughthumbupthumbupthumbup

hoyin

1,232 posts

182 months

Wednesday 21st July 2010
quotequote all
I don't give a monkeys about performance ... I prefer comfort and not looking like a sweaty pig when I step out from the car!

andygtt

8,305 posts

209 months

Wednesday 21st July 2010
quotequote all
TuxMan said:
FUNKSTER UK said:
Getting bored with this!

If it's hot I turn it on.
If it's not I don't.

wavey
biglaughbiglaughbiglaughthumbupthumbupthumbup
you cant get bored yet i havn't had any donations tongue out

wessexrfc

4,323 posts

131 months

Wednesday 21st July 2010
quotequote all
TuxMan said:
FUNKSTER UK said:
Getting bored with this!

If it's hot I turn it on.
If it's not I don't.

wavey
biglaughbiglaughbiglaughthumbupthumbupthumbup
Thats not the sprite, these thing need to be known, so you can calculate just how much fuel it is costing you to stay slightly less sweaty than you would be without, now where was I, that’s right, % of power X heat-soak, divide by temp....blar, blar , blarrrrrr sleephehe (quite right)

Adrian W

11,271 posts

173 months

Wednesday 21st July 2010
quotequote all
wessexrfc said:
TuxMan said:
FUNKSTER UK said:
Getting bored with this!

If it's hot I turn it on.
If it's not I don't.

wavey
biglaughbiglaughbiglaughthumbupthumbupthumbup
Thats not the sprite, these thing need to be known, so you can calculate just how much fuel it is costing you to stay slightly less sweaty than you would be without, now where was I, that’s right, % of power X heat-soak, divide by temp....blar, blar , blarrrrrr sleephehe (quite right)
and the two kilowatt heaters sitting in the seats

daddysumo

2,545 posts

158 months

Wednesday 21st July 2010
quotequote all
hoyin said:
I don't give a monkeys about performance ... I prefer comfort and not looking like a sweaty pig when I step out from the car!


So you obviously did not have it switched on then, when driving the 'ring ??? hehe

Vrsgang norfolk

1 posts

1 month

Monday 12th August
quotequote all
Been speaking to a few people about this someone was telling me when he dynoed his 1.8t golf he got 188 with the air con on with the air con deleted he got 210. I'm now curious to know how badly effected the pd130 is

thebraketester

7,948 posts

83 months

Monday 12th August
quotequote all
The issue with some turbocharged cars is that the intercooler is sandwiched between the ac condenser and radiator. Once you turn on the ac the condenser gets hot and reduces the efficiency of the intercooler and air intake temps will rise. Higher intake temps mean reduced performance.

Adrian W

11,271 posts

173 months

Monday 12th August
quotequote all
thebraketester said:
The issue with some turbocharged cars is that the intercooler is sandwiched between the ac condenser and radiator. Once you turn on the ac the condenser gets hot and reduces the efficiency of the intercooler and air intake temps will rise. Higher intake temps mean reduced performance.
You haven't seen a Noble...…………………………………..have you!





cor nine years between posts!

thebraketester

7,948 posts

83 months

Monday 12th August
quotequote all
I was responding to the post above.