BSSN

The Gurney flap on the back of the Z06 is rather substantial, as Gurney flaps go.

What kind of downforce is generated in the front to balance? How much downforce does the flap in the back generate? How is airflow managed under the car regarding lift/downforce?

Just curious what kind of downforce/at what speed is produced in the front/rear of the Z06 without CFZ package, etc.

BSSN

Anyone?

DaOtherOne

Here's some interesting aero testing information from Katech.

http://www.katechengines.com/street_...a%20report.pdf

dsevo

Very interesting article, but I don't understand why they withheld the actual downforce numbers. To me the only reason anyone would do that is because they weren't impressive. For example, if the stock car had 1 lb. of lift, and then with their parts had 1 lb. of downforce, they could call that 200% increase in downforce. Now I just made these numbers up, but I think you can see my point.

avalonandl

The OEM's jealously gurd their "numbers" and aero is among them. Remember they have to compete with Porsche and others in GT ranks with stock body work. i am sure Katech was prevented from disclosing the real numbers as wind tunnel time is VERY expensive.\\

Avalon

acrace

When the C6 Z06 was rolled out, there was a collection of SAE papers written around the development of the vehicle, along with a compilation of historic papers. I can't recall if aero was one of the topics. I do recall that there was a paper with pretty interesting info on a Grand Am production series Corvette and its aero development. I'll have to check out my book when I get back.

acrace

I found the listing of technical papers on the SAE website. Here's the list of technical papers in the book. Book code if you want to order it is PT-118. Yes, there is a paper on aero development of the C6 Z06.

http://www.sae.org/servlets/PaperEve...PROD_CD=PT-118

Katech_Zach

There are several reasons why we withheld the actual numbers.
1. Our competitors would benefit from our investment
2. The data is complex and needs to be interpreted appropriately
3. The data can be swayed greatly by small variables

Your assumption that the numbers weren't impressive is not correct. The numbers were huge. We went from the stock car having lift to triple digit downforce numbers.

dstiger

COOL!

So can you "feel" the downforce at elevated speeds? I swear the car feels more "weighted" on the road. Like when you are expecting the car's road feel and steering inputs to diminish at elevated speeds but just the opposite occurs.

Am I imagining this?

erichg1000

The stock car has lift? That is kinda weak. I guess the lip just reduces the lift bit adds no down force

AzDave47

Would I mess up the aero balance on my 09 Z06 by changing to the ZR1 rear spoiler while retaining the stock Z06 front spoiler (I can't drive around here with a lower spoiler)?

I like the looks of the ZR1 rear spoiler, but did find the aero stability with the stock spoilers to be fine at 170MPH (Mojave Mile).

Katech_Zach

I've had overwhelming feedback saying our aero parts greatly plant the car and inspire confidence at high speed.

If you're talking about the car in stock form, I think you're imagining it. The car has lift from the factory so the faster you go the lighter it gets, and it does so exponentially.

Katech_Zach

The car has more lift in the front than in the rear. If you're tackling just the rear you are going to wrong direction for balance. You might want to consider one of our front splitters.

dstiger

That is what I figured!

LOL

AzDave47

My car has Bilstein sport shocks which settled the car down at speed. Since I already drag the stock spoiler (replaced once, not just the underneath air dam) I suspected and you confirmed, the ZR1 spoiler would make the balance worse than stock, so no changes for me.

DaOtherOne

Here's what worked for me:

GM full length Rear spoiler, ZR-1 side skirts, ZR-1 front splitter.

I didn't want to put the front splitter with under tray.
Instead I removed the middle piece on the air dam.
I left the two small pieces of air dam on each side to keep air going to the brake ducts and channeled around the front wheels.

I also have the DRM revalved Bilstein shocks.

The car is rock solid at when I run her up to 140.

jlutherva

I just installed the Katech front splitter w/ brake ducts and under tray and the Keteck rear spoiler. I also installed the RPI side skirts. I was at VIR this last weekend and have several qualitative observations. First the Z was much better planted over the rise on the back straight and the rotors seemed to be much cooler after a run. Usually, the radiant heat is very significant. With the new duct system and the Quantum cooling kit, the difference was obvious.

Jim

BSSN

Dodge happily tells us the DF on a stock Viper and stock settings for the ACR.

BSSN

This is why I always thought the GM full-length spoiler was dumb without a splitter in conjunction.

Do you know how the Z07/CFZ package does? Is it technically more planted, or is it REALLY more planted?

If you are judging this just from steering feel, I agree. It weights up as you speed up. That has nothing to do with the condition of the tires vs. road and how well they know each other at that moment in time unless they actually lose contact, then you will fell it in the steering and running down your pant-leg as well at those speeds, lol

4GS7

How much does the factory rake offset the lift?