CS bonnet: Measured IAT reduction?

[M2C]

Hey guys,

Does anyone have any figures concerning IAT reduction due to the CS bonnet with its vent?

Thanks in advance.

[M3SQRD]

Originally Posted by M2C

Hey guys,

Does anyone have any figures concerning IAT reduction due to the CS bonnet with its vent?

Thanks in advance.

I don’t believe the point of the vent was to lower IAT. It’s to vent the high dynamic pressure that builds up under the hood that ultimately results in lift especially at high velocity. The vent lets what would become stagnated air flow out through the front of the hood.

[Yuille36]

After reading that, it makes perfect sense. But most people buy them just for that more aggressive look.

[M 4 FUN]

Like M3SQRD says, the purpose is to ventilate air and reduce lift at the front end and reduce weight, but that is only for the genuine carbon hoods, they reduce weight with 33%, fom 19,8 pounds to 13,2.

[jaylazy2020]

Originally Posted by M3SQRD

I don’t believe the point of the vent was to lower IAT. It’s to vent the high dynamic pressure that builds up under the hood that ultimately results in lift especially at high velocity. The vent lets what would become stagnated air flow out through the front of the hood.

I was toying with the idea of getting a new one. Already painted San Marino blue.


Not sure if it will match the wings of my car perfectly though!

But at 305km/h it might help the front end from straying!

[Yuille36]

Originally Posted by jaylazy2020

But at 305km/h it might help the front end from straying!

Yes, that is called lift. A front splitter helps mitigate lift.

[jaylazy2020]

Originally Posted by Yuille36

Yes, that is called lift. A front splitter helps mitigate lift.

I got it.
When I lost my carbon front splitter in Paris last month.

The front end wasn’t as sure when hitting 280km/h going back to Stuttgart

[M3SQRD]

Originally Posted by jaylazy2020

I was toying with the idea of getting a new one. Already painted San Marino blue.


Not sure if it will match the wings of my car perfectly though!

But at 305km/h it might help the front end from straying!

I looked into ordering one of the CF hoods in 2017 but my f82 is individual Moonstone Metallic and I was afraid they couldn’t match the hood to the front body panels. I didn’t want any blending done. However, getting the exact amount of gold hue in the various shades of gray is challenging. I also didn’t want to pay repeatedly to repaint the CF hood until it matched perfectly.

[M3SQRD]

Originally Posted by Yuille36

Yes, that is called lift. A front splitter helps mitigate lift.

Even the GTS extended front splitter only makes 68 lbf of downforce at 186 mph. Its actual magnitude is higher if you compared it to the lift force of the base and Comp models at 186 mph. Front splitters need to be long, wide and low to the ground to generate meaningful downforce.

[jaylazy2020]

Originally Posted by M3SQRD

Even the GTS extended front splitter only makes 68 lbf of downforce at 186 mph. Its actual magnitude is higher if you compared it to the lift force of the base and Comp models at 186 mph. Front splitters need to be long, wide and low to the ground to generate meaningful downforce.

Very insightful. Cheers

[Yuille36]

Originally Posted by M3SQRD

I looked into ordering one of the CF hoods in 2017 but my f82 is individual Moonstone Metallic and I was afraid they couldn’t match the hood to the front body panels. I didn’t want any blending done. However, getting the exact amount of gold hue in the various shades of gray is challenging. I also didn’t want to pay repeatedly to repaint the CF hood until it matched perfectly.

Just curious why you didn't have them do spray outs, to match the color perfectly?

[M3SQRD]

Originally Posted by Yuille36

Just curious why you didn't have them do spray outs, to match the color perfectly?

Have you seen what moonstone looks like in different lighting?

[Yuille36]

Originally Posted by M3SQRD

Have you seen what moonstone looks like in different lighting?

No, I never seen Moonstone period.

[M3SQRD]

Originally Posted by Yuille36

No, I never seen Moonstone period.

Didn’t think about the difficulty of having the car repainted if something happened until after taking delivery. It has even more colors than what those three pics show so it’s difficult to get the right mixture for all of the various colors/shades as the lighting changes. I absolutely love the Moonstone Metallic with Opal White interior. On most days, as you walk to the car it looks like you have a different colored car

[jaylazy2020]

My standard bonnet is ruined by stone chips so it got me looking at getting a low mileage new bonnet.

Quite a few in San Marino for circa €500

This CS one is €3500

[Colinv6]

Originally Posted by jaylazy2020

My standard bonnet is ruined by stone chips so it got me looking at getting a low mileage new bonnet.

Quite a few in San Marino for circa €500

This CS one is €3500

Hi where is this located please??

[M3SQRD]

Originally Posted by Colinv6

Hi where is this located please??

Someone seems very interested

[M3SQRD]

Originally Posted by jaylazy2020

My standard bonnet is ruined by stone chips so it got me looking at getting a low mileage new bonnet.

Quite a few in San Marino for circa €500

This CS one is €3500

That’s a great price. Even if you had to repaint to get the CF hood to match you’d only be ~50% of the cost of a new CF hood.

[jaylazy2020]

Originally Posted by Colinv6

Hi where is this located please??

86647 Buttenwiesen Germany.

[Colinv6]

Originally Posted by jaylazy2020

86647 Buttenwiesen Germany.

Ahh thank you. Bit of a logistics nightmare to Scotland

[jaylazy2020]

Originally Posted by M3SQRD

That’s a great price. Even if you had to repaint to get the CF hood to match you’d only be ~50% of the cost of a new CF hood.

You’re talking me in to it!

[Colinv6]

Originally Posted by M3SQRD

Someone seems very interested

It’s the missing piece of the puzzle for me, but I’ll only go for an OEM one. I get the idea of a replica but the fit is rarely perfect and it’s a bit like wearing a fake Rolex.