[eMcL]

Some additional promotional info from McLaren ...
“The underfloor guide vanes are placed beneath the front of your Sports Series. They channel air away from the rear diffuser, forcing it to exit below the doors. This creates a low pressure zone at the front of the car, balancing the increased downforce from the rear wing. The High Downforce Kit adds an incredible 75kg of extra downforce – pushing your car’s surefootedness to even greater heights.”

 

[zerokewl]

Some additional promotional info from McLaren ...
“The underfloor guide vanes are placed beneath the front of your Sports Series. They channel air away from the rear diffuser, forcing it to exit below the doors. This creates a low pressure zone at the front of the car, balancing the increased downforce from the rear wing. The High Downforce Kit adds an incredible 75kg of extra downforce – pushing your car’s surefootedness to even greater heights.”

Thanks eMcL - but can you let me know where you got that quote from please? On the McLaren site they do not mention balancing or low pressure zones at the front. I saw the video with Ross Kaiser who talks about guiding the air to under the doors, but I can’t find an official written description from McLaren saying that (even the June 5th official press release does not specifically mention front downforce effects).

McLaren Sports Series Accessories Range (Consumer English) - MSO Defined High Downforce Kit

accessories.mclaren.com

McLaren Newsroom

cars.mclaren.press

The description on their site talks about the guides, and specifically says drag reduction. If it added significant additional front downforce I’d have thought they’d be trumpeting that everywhere in their descriptions of the HDK. Here is the only official description I can find online:

“An unmissable wing extends prominently from the rear, working the airflow to generate additional downforce. Behind the scenes – or, more accurately, under the floor – precisely engineered guide vanes filter the air that passes underneath the car to reduce drag. While a unique, central high-mounted stop light ensures no compromise on either performance or safety.”

I wish I could see a picture of these guides to get a better understanding of McLaren’s goal with them - but for some reason I cannot find any pics of them anywhere. Does anyone have a picture of the guide vanes??

Lowering front pressure will increase front downforce, but I can’t see it making a massive difference considering the flat underbody, the ride height and the unchanged splitter. I have been asking the parts guys at MacSF about getting me the front splitter from the GT4 as I do want to play with the rear downforce more which will start to require more front downforce. In practice right now though I’m definitely feeling the car is much more balanced with the wing as-is without tweaking front down force yet.

Thanks!

Z.

 

[eMcL]

Yes in general I agree that being careful about MSO performance claims for add on's is good advice. Examples being 600LT snorkel and upper front fender vents which are decorative but non functional in terms of performance enhancements. But in this case of the MSO rear wing and under floor front vanes I talked with the head of engineering and was assured that they are functional. I think that the 600LT work at McLaren along with the speed stability issues with the 570S that you and others have talked about in other threads resulted in offering the HDF kit.
The full quote is "The High Downforce Kit is no mere decoration. Just like every single part of every single McLaren, it’s designed for pure purpose. In this case, to increase aerodynamic performance. The underfloor guide vanes are placed beneath the front of your Sports Series. They channel air away from the rear diffuser, forcing it to exit below the doors. This creates a low pressure zone at the front of the car, balancing the increased downforce from the rear wing. The High Downforce Kit adds an incredible 75kg of extra downforce – pushing your car’s surefootedness to even greater heights. This increases stability when traveling at speed, yet crucially leaves the characteristically agile dynamics of the Sports Series firmly intact during lower speed driving. The results open up heart-stopping new limits to your drive."
You can find it at https://cars.mclaren.com/en/ownership/mclaren-genuine-accessories/high-downforce-kit
by opening the section "HONED TO PERFORM"

 

[zerokewl]

Yes in general I agree that being careful about MSO performance claims for add on's is good advice. Examples being 600LT snorkel and upper front fender vents which are decorative but non functional in terms of performance enhancements. But in this case of the MSO rear wing and under floor front vanes I talked with the head of engineering and was assured that they are functional. I think that the 600LT work at McLaren along with the speed stability issues with the 570S that you and others have talked about in other threads resulted in offering the HDF kit.
The full quote is "The High Downforce Kit is no mere decoration. Just like every single part of every single McLaren, it’s designed for pure purpose. In this case, to increase aerodynamic performance. The underfloor guide vanes are placed beneath the front of your Sports Series. They channel air away from the rear diffuser, forcing it to exit below the doors. This creates a low pressure zone at the front of the car, balancing the increased downforce from the rear wing. The High Downforce Kit adds an incredible 75kg of extra downforce – pushing your car’s surefootedness to even greater heights. This increases stability when traveling at speed, yet crucially leaves the characteristically agile dynamics of the Sports Series firmly intact during lower speed driving. The results open up heart-stopping new limits to your drive."
You can find it at https://cars.mclaren.com/en/ownership/mclaren-genuine-accessories/high-downforce-kit
by opening the section "HONED TO PERFORM"

Ahh, that's weird - I've been to that page several times (even quoted it myself above), and for some reason on my mobile browser that paragraph never showed up!

However, I still want to know how much extra force it's adding. If I could get a set of just the guide vanes would be cool so I can test actual differences in downforce (by measuring ride height change at speeds up to 150mph), but right now I can't even get a pic of them.

Thanks!

Z.

 

[eMcL]

Ahh, that's weird - I've been to that page several times (even quoted it myself above), and for some reason on my mobile browser that paragraph never showed up!

However, I still want to know how much extra force it's adding. If I could get a set of just the guide vanes would be cool so I can test actual differences in downforce (by measuring ride height change at speeds up to 150mph), but right now I can't even get a pic of them.Thanks! Z.

Yes my thought is that the intent of the MSO wing and guide vanes are to remove some of that small lifting feeling at 120+ mph that the standard car has — plus a looks improvement with the expensive weave?. Not so much aimed at big improvements in track performance, the 600LT offers that.

With regard to the guide vane photo you might PM one of the forum members that have installed the HDF kit and ask — IIRC one member indicated willingness to take a photo.

 

[midnightblue]

I have not been able get it on a lift so the only image I have is from sticking my phone under the front bumper. Basically, they are just a curved bit of rubber/plastic(?) bolted to the undertray.

 

[Spr]

Nice you have the newer ones.

 

[zerokewl]

I have not been able get it on a lift so the only image I have is from sticking my phone under the front bumper. Basically, they are just a curved bit of rubber/plastic(?) bolted to the undertray.
View attachment 195791

Thanks!

I assume there are two - one on each side? Seems to be about 3" or so "tall"? At first glance I'd think that design would introduce some turbulence between the guide and the wheel because it doesn't extend out laterally very far (seems like only about 5" wide or so from the pic), but maybe that's the point. By the description I though the guide would extend out further towards the door, and maybe be a bit further back too.

Definitely interested in seeing what kind of measurable effect it has overall and do some ride height before/after up to speed - I might construct some test guides since they look pretty simple as I was told you can't buy the guides without the entire kit.

Thanks again midnightblue!

Z.

 

[Ingenere]

My Track Pack car doesn't seem to suffer high speed stability or stability under braking and is stock.

I can't believe that a visit to Home Depot couldn't reproduce those vanes for $10.

 

[zerokewl]

My Track Pack car doesn't seem to suffer high speed stability or stability under braking and is stock.

I can't believe that a visit to Home Depot couldn't reproduce those vanes for $10.

I agree - and will try to do it. Really interested in how effective such a small addition could really be. I'm guessing, by their placement, the wheel wells cause a lot of turbulence for the air flow heading to the back, increasing air pressure at the front like a "turbulence dam". These pieces look like they block off the wells somewhat and redirect the turbulent air back towards the well and under the door. Then the air rushing down the middle maintains a very low air pressure, activating ground effects, and sucking the car down to the ground at the front reducing lift. This explanation would be consistent with their "reduces drag" explanation, when looking at them it intuitively looks like it would increase it.

Essentially this would be a correction of a minor "flaw", but if it's effective, great. I do feel they should supply these without the kit though if their primary function is to reduce the high speed frontend lift that can be felt sometimes. Not that I've ever had an issue doing speeds well over 160, and the car definitely feels more planted than any other I've driven at those speeds, but still, if this improves things dramatically at higher straight line speeds (especially approaching 200MPH+), then they should be available from parts separately.

Thanks!

Z.

 

[Spr]

I have a new set being shipped. There have been 2 iterations so far. 720's have these btw. I'll let you know what I think after I toss them on. I dunno about the home depot comment. You make them? Doubtful.

 

[CgKTx]

I added the kit to my 2016 570S primarily for the way it looked. Only downside is that it does cut right through your rear view mirror view at a perfect height to block the light bars on any following police cars. Not that rare in the SF Bay Area. When I had mine done six weeks ago it was #7 and the last cars and coffee I went to there were four 570s and three had the wing. (My white one, a gray spider and an orange spider. The fourth car was a 570GT which can't fit the wing anyway...)
View attachment 195706

Were the guide vanes installed with your kit? I had the MSO HDK installed on my '16 570s and was told by the dealer the guide vanes were not applicable for this model year. Thanks.

 

[Batman]

I added the kit to my 2016 570S primarily for the way it looked. Only downside is that it does cut right through your rear view mirror view at a perfect height to block the light bars on any following police cars. Not that rare in the SF Bay Area. When I had mine done six weeks ago it was #7 and the last cars and coffee I went to there were four 570s and three had the wing. (My white one, a gray spider and an orange spider. The fourth car was a 570GT which can't fit the wing anyway...)
View attachment 195706

The wing can be fitted to a 570gt

 

[Magnum]

Hi All,

I just bought an MSO rear wing coming out of a 570S Spider owned by the dealer who sold me my 570S Coupe.
I installed it yesterday knowing that the brake light harness is specific to Spider.
McLaren has proposed me a new harness for almost 500€...
However, it's only a matter of 2 wires but I don't know where the original connector is located in the engine bay.
Does anyone have an idea?

 

[ek123]

For those with the MSO wing, Does the brake light on the wing go on and the original brake light in the back of the car?

 

[ByJoveByJingle]

For those with the MSO wing, Does the brake light on the wing go on and the original brake light in the back of the car?

The original brake light is blacked out. Is that what you are asking?

 

[ek123]

The original brake light is blacked out. Is that what you are asking?

Yes exactly.
Thanks. This is what we decided to do yesterday and black out the original light