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vlad
Imola


Joined: 16 Aug 2006
Posts: 859
Location: Berkshire


PostPosted: Sat Apr 20, 2019 9:24 am    Post subject: Air Intake temperatures Reply with quote

Just wondering about the above and the effect on performance.

A couple of reasons:

There was the wheeler dealer 996 restoration recently when Ant was discussing the relative merits of the after market mod. that was on their car - cone filter (he removed it - for reasons it was pulling in hot air from the engine bay rather than the cooler air from outside).


Also Biovox's thread on his turbo (I have a 997T with a similar 9e package and also absolutely love it), but I notice the dyno runs are at very different intake temps. and again wondered what the effect may have been?

For me its absolutely noticeable (best hoons ever have been at dawn), before its warmed up, where the cars a NA 996 C4s before and now the 997T feel so strong.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16360
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Apr 20, 2019 9:51 am    Post subject: Reply with quote

It makes a big difference. You can feel the difference on a good drive (up at temp.) between a frosty morning with the temp's around 2 deg and a hot day around 24 deg. So if you can feel a noticeable difference between 22 deg, imagine what a 70 deg temp change would be like.

Not just that, the design of the standard air intake means are gets pushed down the 'snorkel' as it passes over the car. You really want the spout to have air forced into it whilst in motion. You won't get this on the type they had originally fitted on WD.
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16360
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Apr 20, 2019 9:52 am    Post subject: Reply with quote

Something like this would be the preferable option Grin


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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1164
Location: Berkshire


PostPosted: Sat Apr 20, 2019 10:07 am    Post subject: Reply with quote

Can't beat cooler, therefore denser, air.
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16360
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Apr 20, 2019 11:31 am    Post subject: Reply with quote

It's the reason Turbos have clown's pockets in the side. Tucked up in there are two huge intercoolers that the compressed air from the Turbo has to go through to be cooled before entering the engine to get the optimum performance from it.

This post gives you an idea of the BHP increase by the cooling effect using an intercooler with a turbo:

https://www.quora.com/Does-a-turbocharged-engine-require-an-intercooler
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