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Author Topic: Higher outside temp = slower acceleration?  (Read 4912 times)

Peskarik

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Higher outside temp = slower acceleration?
« on: 15 October 2008, 18:25 »
Today was 19C degrees outside when I was going home. It's highway, 70-100 mph.
The car feels slower to accelerate than when the outside temperature is say 14 degrees.  :undecided:
I have the map, but stock internals.
I know there was a post discussing the temperature issue.

I guess the problem is intake air being too hot, right?
Do you think Carbonio intake or bigger IC would alleviate the problem? :undecided:
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Offline SteveS

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Re: Higher outside temp = slower acceleration?
« Reply #1 on: 15 October 2008, 18:28 »
cooler air combusts more, providing more power. so if the temp is hotter of the air, less combustion!
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SteveS

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Offline RedRobin

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Re: Higher outside temp = slower acceleration?
« Reply #2 on: 15 October 2008, 18:29 »
....

It's well known on turbo'd cars. S3 intercooler or Forge Twintercooler (or both!) is the favourite cure. Carbonio won't help much I don't think - It's just a more efficient air intake rather than a low mounted 'cold' air intake.
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Offline Hurdy

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Re: Higher outside temp = slower acceleration?
« Reply #3 on: 15 October 2008, 19:05 »
Quote from: SteveS on 15 October 2008, 18:28
cooler air combusts more, providing more power. so if the temp is hotter of the air, less combustion!

Not quite. :smiley:

Cooler air is denser and contains more oxygen when compared like for like with a same volume of warmer air. Ergo more oxygen in the same volume is drawn into the intake giving a small increase in power. Similarly, when it is colder the intercooler is able to keep the system cooler and therefore more efficient and so has less power loss. The two combined give a decent increase in useable power in colder weather. :smiley:
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Offline R32UK

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Re: Higher outside temp = slower acceleration?
« Reply #4 on: 15 October 2008, 19:12 »
Quote from: Peskarik on 15 October 2008, 18:25
Today was 19C degrees outside when I was going home. It's highway, 70-100 mph.
The car feels slower to accelerate than when the outside temperature is say 14 degrees.  :undecided:
I have the map, but stock internals.
I know there was a post discussing the temperature issue.

I guess the problem is intake air being too hot, right?
Do you think Carbonio intake or bigger IC would alleviate the problem? :undecided:

i think someone is possibly trying to justify a new mod???    :lipsrsealed: :rolleyes:
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Offline Hurdy

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Re: Higher outside temp = slower acceleration?
« Reply #5 on: 15 October 2008, 19:14 »
I think you maybe right there  :rolleyes:
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Offline RedRobin

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Re: Higher outside temp = slower acceleration?
« Reply #6 on: 15 October 2008, 19:22 »
Quote from: Hurdy on 15 October 2008, 19:14
I think you maybe right there  :rolleyes:

....Well if anyone knows the tell-tale signs, you do! :evil:
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Offline SteveS

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Re: Higher outside temp = slower acceleration?
« Reply #7 on: 15 October 2008, 19:28 »
so yea... basically wot i said... :-|
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SteveS

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Offline Hurdy

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Re: Higher outside temp = slower acceleration?
« Reply #8 on: 15 October 2008, 19:33 »
Quote from: SteveS on 15 October 2008, 19:28
so yea... basically wot i said... :-|

Sorry....went into T_T pedant mode their for a second :embarassed: :laugh:
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Offline topher

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Re: Higher outside temp = slower acceleration?
« Reply #9 on: 15 October 2008, 19:33 »
You're talking ambient temps here, so intake temps. Intercoolers won't do squat against that, you need a decent cold air intake. If you're thinking of the type of system that uses a cone filter somewhere in the wing or behind the bumper vents, make sure you get a 'sock' for the filter or you risk sucking in water. Hydraulic lock is very messy!
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