911 rear spoiler - anyone here know about aerodynamics?

[Wozy68]

ras62 said:

Surprising lift numbers without a spoiler, you would certainly feel less stable at motorway speeds.

https://forums.pelicanparts.com/porsche-911-techni...

https://forums.pelicanparts.com/porsche-911-techni...

Yes I’ve seen that before .... but it’s not a 964/993 which really is like comparing apples with oranges with the early cars.

[Steve Rance]

I was happy to throw all of the motor assembly on mine in the bin and just change the grill to open stainless - but the red lights flashing all over the place on the dash drove me mad. I couldn’t find the fuses so I bought a motor off or eBay, plugged it in and the lights went off. Happy days

Not really the right reason to keep a spoiler but it kind of worked for me

[g7jhp]

I'd go with a carbon lid with a custom grille.

[Kawasicki]

I’ve done a fair bit of aero tuning on cars, using test tracks and the autobahn.

Small parts, in the right place can have a surprisingly big effect on the steering response of the car, i.e. how settled/stable it behaves, vs how twitchy/nervous it is. The effects can start at about 120 kph., and can be felt during small steering adjustments, or when changing lanes, or when passing the bow wave of a truck, or in crosswinds. It’s not only about aggressive driving.

The wind-tunnel engineers come up with what they think will be the worst case car, then I set up a car the same way and they also give me a few parts to try... then I evaluate them, write a report... and that’s the end of my involvement.

[Orangecurry]

Kawasicki said:

I’ve done a fair bit of aero tuning on cars, using test tracks and the autobahn.

Thanks K. I'm sure I'd 'get away' without the spoiler, and I'm sure Steve's skills had subconsciously soaked up the differences in his unspoilered 964 at Spa, but your point is well made.

g7jhp said:

I'd go with a carbon lid with a custom grille.

In the short-term, I think so too. But medium term I'd like something that does the aero, weighs very little and looks good.

Thanks all.

If anyone out there has a lightweight panel factory looking for some ideas?

Would you want a 964 version of a lightweight engine-lid/spoiler Steve?

[Kawasicki]

Orangecurry said:

Kawasicki said:

I’ve done a fair bit of aero tuning on cars, using test tracks and the autobahn.

Thanks K. I'm sure I'd 'get away' without the spoiler, and I'm sure Steve's skills had subconsciously soaked up the differences in his unspoilered 964 at Spa, but your point is well made.

g7jhp said:

I'd go with a carbon lid with a custom grille.

In the short-term, I think so too. But medium term I'd like something that does the aero, weighs very little and looks good.

Thanks all.

If anyone out there has a lightweight panel factory looking for some ideas?

Would you want a 964 version of a lightweight engine-lid/spoiler Steve?

No problem. Saving the weight is fun. I‘ve just bought a light exhaust system for my motorbike. It will have potentially have some downsides, but I‘m prepared to work with that.

As others have said, keep an eye on engine temperature... maybe the spoiler has multiple functions.

[g7jhp]

What wheels do you have on the 993 as the turbo look wheels were very heavy.

Would be the first place to lose some weight.

[Orangecurry]

Kawasicki said:

As others have said, keep an eye on engine temperature... maybe the spoiler has multiple functions.

A new design engine-lid/spoiler combo wouldn't be solid - I would also have the'hole' on the top at least as large as the standard 993 grill, not the narrower 911 grill hole that the current offerings of ducklid has - as per the photos above.

The Werks ducklid is an odd shape on top as it has space for an intercooler? We wouldn't need that.

g7jhp said:

What wheels do you have on the 993 as the turbo look wheels were very heavy.

Would be the first place to lose some weight.

Yes - when I bought the 993 it had 18" solidspokes on it. Oh my goodness.... the weight of those rears

It was the first thing I changed. Went to 17" Cup2s, then 18" MY02s, then 17" Sport Classic - which are (ignoring tyres) at least 11.5 kgs lighter as a set over solidspokes.