LaughaC

Has anyone seen some ways to improve front end downforce, perhaps by routing air through the lower valence and out through an opening in the front lid like a Lotus Exige?

Also, where do I find the best covers to reduce the drag caused by our headlights?

Steve Weiner-Rennsport Systems

Chris:

LOL,...You need a serious splitter to generate front downforce. Now,...........if you pursue that, you will need to balance the aero forces with a similar performing wing on the back otherwise you create VERY serious oversteer at speed. This is a veryt complex subject,......

The Bosch H-1 or H-4 assemblies are probably the best choices overall. The US headlight units that you currently have create terrible drag as well as admit water into the headlight bucket.

LaughaC

Thanks! I'll upgrade my headlights.

V2Rocket

Here's a bodykit that will get you all the downforce you need - look how composed it is through the corner!!

Daniel Dudley

Make sure your front end is not high in relation to the back end. Level sills or a slight rake.

JackOlsen

That's good advice about the rake.

Do you have the front rubber splitter?

You don't need anything exotic to keep the front end down on a 911. (And most of the nonsense on the Exige is really just for show.)

LaughaC

LOL! I love the Enzo kit.

Actually, my whole car is very low and level. I've only felt a slight lift over 120 MPH. My concern is that it may put me in the wrong lane position when I need to do some heavy braking someday.

I've been driving without a chin spoiler because my stock valence rubs most speed bumps already. What I need is a disposable chin spoiler that I can replace once a month when traffice forces me to feed it to a speed bump or hungry driveway.

Steve Weiner-Rennsport Systems

911's should NEVER be level otherwise the front end lifts at speed,.....

Set them up with 1 degree nose-down rake to reduce lift & drag.

Steve Weiner-Rennsport Systems

If you use a rear spoiler without the matching chin spoiler, you create a potentially dangerous front-lift issue that increases hydroplaning in the wet and severe understeer at speed. These were specifically designed by Porsche's engineering department to be deployed in matched sets.

LaughaC

Points well taken. I knew about the requirement for all-or-none regarding front-rear spoilers, but had not yet heard about the 1' rake requirement.

I was thinking that raising the rear end would increase the tail-happines of the car. I've only spun it into lawn-mower mode twice so far. On both occasions it started with severe understeer on the marbles I was unable to catch the rear when it hit the same marbles because of the lightning speed of the switch from under to oversteer.

KRA993tt

This is probably more extreme than what you have in mind but it is a GT Racing bumper cover. It definitely produces downforce. As Steve mentions you need to balance the car aerodynamically for your application. I think Gt Racing also has a splitter that can be attached to the bottom of most any bumper cover. Keep in mind the faster you go the more effective the splitter is, in general terms.

earlyapex

Courtesy of Elephant Racing:

http://elephantracing.com/project/oi...coolermain.htm

This is what you are looking for.

Slantnose!

True.
You can actually feel it, too.
Besides, it doesn't look right anyway, heh...

LaughaC

Thanks EarlyApex! That hood vent is exactly what I was wondering about. It looks like those guys at Elephant Racing did it right and definitively proved the downforce it creates.

srf506

The only other thing I'd have done is to eliminate the fresh air-scoop at the aft end of the hood too. Just to eliminate the drag.