 | Home > Puma (Tdci) > Engine power delivery down when when A/C is on ? |
 
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4209   
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I don't notice much/any difference in power with AC on, including in very hot weather. I can hear pump and fan coming on and off, but that's about it. Unlike my daily driver, it's little 1.0 engine is notcably weaker when the AC is running. 2007 110 TDCi Station Wagon XS
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20th Jul 2023 12:53pm |
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| Chicken Drumstick Member Since: 17 Aug 2020 Location: Near MK Posts: 731
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I'd guess an aircon compressor could be sapping 5-15bhp.
But as a rule you'd be hard pressed to really tell from the drivers seat. Is the vehicle standard or mapped? Have you ever had it on a dyno and seen what sort of whp it is making? |
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20th Jul 2023 1:05pm |
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| MatLandy Member Since: 11 Sep 2020 Location: Paris Posts: 184  
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yes, it has a BAS remap (with upgraded intercooler and hoses).
No dyno as per say. Just a butt dyno feeling 
By the way, had the A/C re gassed before summer, they took 455g out and put 600g back in, so this is not the pb. Seems the Landy wants to kangaroo sometimes at low revs which it didn't do during winter. /Mat Last edited by MatLandy on 9th Sep 2023 5:37pm. Edited 1 time in total |
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20th Jul 2023 1:32pm |
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| Ads90 Member Since: 16 Jun 2008 Location: Cots-on-the-Wolds Posts: 809 
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Me too, just as you describe, unmodified 2.4 90. If I'm in stop-start traffic it becomes a bit harder to pull away smoothly too. Always been like it, so assumed normal - I always switch it off if going up steep hills or needing to get off the line quickly. Same in my previous v8 50th too, small but noticeable drop in power with ac on, I think it's just the nature of the thing. |
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20th Jul 2023 4:34pm |
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| zdq87 Member Since: 16 Jul 2020 Location: Bratislava Posts: 5 
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This has been my experience aswell (standard 2.4 D90).
As soon as the temperatures rise above 20-25C and AC is on the lowered power is very noticable. And it makes more noise too, as the engine fan also engages. Turn the AC off all back to normal. Below cca. 20C or so ambient temp the engine fan doesnt engage and it is much quiter, so you can actually hear the compressor engage/disengage. Never had this issue on any other car so been wondering if it is okay. My AC has been serviced/regassed, is blowing cold air, but it stayed the same. At some point I plan to replace the condenser as it is corroded and some fins started to fall out so will see if that changes anything. |
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21st Jul 2023 2:49pm |
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| MatLandy Member Since: 11 Sep 2020 Location: Paris Posts: 184
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Updating my own thread.
During our 3 weeks trip in Spain in August, with temperature often in the 35°C and above, my brain finally kicked in  I switched the selector to have the internal cabin air recirculated, instead of contantly ingesting hot air from outside. Cooling the same air in a closed circuit is obviously more efficient, and adds less load on the engine after a while once it has started to cool down.
Oh well, there is still a drop in the engine power available, but totally acceptable I would say. /Mat |
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9th Sep 2023 5:57pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1076  
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Never noticed a power drop with AC on with the 2.2 puma. I do though with the 100bhp Diesel C3 Citroen, but just a little. Once had a rental Twingo and you could use the AC switch to brake it down to a halt |
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9th Sep 2023 7:31pm |
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