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      12-19-2019, 02:31 PM   #1
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M2 Pikes Peak Racer Claims Cutting Out the Kidney Grills Cuts 10-15 Degrees of Temps

Newest Hoonigan episode, The Wildest BMW M2 Track Car Ever? 500hp Pikes Peak Spec, a BMW M2 Pikes Peak Racer/Car Owner showcases his M2 build. His M2 has its kidney grills cut completely open without the vertical bars.

He did extensive windtunnel testing at a university and about the 5:37 mark in the video he claims that just doing that cut temps by 10-15 degrees.

Everyone's thoughts?

Video:
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      12-19-2019, 03:29 PM   #2
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I have a hard time believing that claim, I would love to see the data supporting it.
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      12-19-2019, 03:40 PM   #3
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Quote:
Originally Posted by b92 View Post
I have a hard time believing that claim, I would love to see the data supporting it.
Ditto. That's a massive decrease.

In my other car, switching from the crappy single row dual pass OEM rad to a 3 row dual pass all aluminum rad did jack shit for temps. It's obviously not a race car, but one would think that a much larger rad with 3x the rows would lower temps at least slightly. Did not.
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      12-19-2019, 05:40 PM   #4
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Cutting your grills out of your stock car won't decrease your temp.

The thermostat and electric water pump are what decide the temps on our non race cars.

If you're over heating because your car is modified then it can help.

By cutting them out, you also run the risk of having your radiator more easily damaged by road debris.
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      12-19-2019, 06:18 PM   #5
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I don't know, this guy has spent a lot of time and money on this car. Seems like he's done a lot of testing, how many guys put their car in a wind tunnel? Dyno maybe so who am I to question his numbers.

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      12-19-2019, 06:26 PM   #6
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Ill test it once I get my car back together and tuned for my new setup. If it's true the N54 should show a Delta since it runs so hot.

Will post logs with and without the center section. Looks kinda cool.
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      12-28-2019, 03:25 PM   #7
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pikes peak is 14k elevation so a lot less air density compared to sea level. The temp delta is probably less when you compare it at sea level. The guys car is a race car...street car you need to make compromises.
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      01-31-2020, 08:07 PM   #8
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Quote:
Originally Posted by TURBO8 View Post
Cutting your grills out of your stock car won't decrease your temp.

The thermostat and electric water pump are what decide the temps on our non race cars.

If you're over heating because your car is modified then it can help.

By cutting them out, you also run the risk of having your radiator more easily damaged by road debris.
Remember the Camaro Z/28's flowtie?
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      02-02-2020, 03:10 PM   #9
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Quote:
Originally Posted by Grip Addict View Post
Newest Hoonigan episode, The Wildest BMW M2 Track Car Ever? 500hp Pikes Peak Spec, a BMW M2 Pikes Peak Racer/Car Owner showcases his M2 build. His M2 has its kidney grills cut completely open without the vertical bars.

He did extensive windtunnel testing at a university and about the 5:37 mark in the video he claims that just doing that cut temps by 10-15 degrees.

Everyone's thoughts?

Video:
Quote:
Originally Posted by Grip Addict View Post
Newest Hoonigan episode, The Wildest BMW M2 Track Car Ever? 500hp Pikes Peak Spec, a BMW M2 Pikes Peak Racer/Car Owner showcases his M2 build. His M2 has its kidney grills cut completely open without the vertical bars.

He did extensive windtunnel testing at a university and about the 5:37 mark in the video he claims that just doing that cut temps by 10-15 degrees.

Everyone's thoughts?

Video:
Future BMWs will see a bigger temp drop when those huge beavers are trimmed!
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