Hexus

There are several ZR1 style lip spoilers available on a market:

OEM ZR1:



Callaway:



Katech:



Some vendor data on them:



Data shows that while Katech is almost twice higher and have high middle part it add no signigicant downforce comparing to Callaway. Katech middle part is not working as good as sides, I know, but it must add something to downforce... And ZR1 spoiler which is 0.7" lower is practically useless according to data... How could it be?

I'm looking for cheap practical solution to decrease car jumps from track springboards and increase fast corners speeds. There are full wing solutions on a market like APR GTC500, or even GT2 style wings. But they require huge front downforce with long and wide splitters which are not practical at all. Otherwise downforce balance will be moved to the back of a car and car will have sighnificant understeer as I understand. GTC500 downforce at 180 mph is nearly 762 lbs!

Do anybody have practical knowledge about spoiler downforce numbers?

AU N EGL

Well might want to look at 40 to 120 mph data. that is where you spend most of your time.

good luck

VatorMan

I don't know if I want to drive a R/R track with a 180 mph section.

jasonberkeley

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

Very helpful win tunnel data from Katech

Hexus

Thanks, my data is based on this info.

Finally I've found error in my calculations so correct data is:



Katech is a winner here and OEM ZR1 spoiler is still too low for track applications.

John Shiels

what would a spoiler do at 40 mph?

John Shiels

small spoilers are not going to do much to keep you car from what you call car jumps especially at lower speeds. I think you could find more speed from you suspension workings and tires.

John Shiels

so what tracks are you heading to?

AU N EGL

VIR back straight in a ZR1 at 175-8

Road America in the Morain straight ( back straight) into T5 172-175

and the Hurry Downs into Canada corner T12 172+/-

Road Atlanta could be the same into T10

63Corvette

I have driven Taladega and Daytona before aero. Both have 180+mph "turns".

jasonberkeley

Really? What kind of lap times are you turning at Road Ameica that you claim you are hitting those speeds?

Because unless your lap times are sub 2:15, for those sraight line speeds, something is seriously wrong.

John Shiels

wonder the lap time at VIR at 180 in a ZR-1

AU N EGL

Real close, Car was stock with stock tires, so that was 2 -3 laps and then we backed way down.
I much more comfortable doing the 150-155 range and braking sooner than too deep.

TKOGTO

Aero is a tricky thing. Balance is most important. Adding the Katech spoiler (which I have) w/o something to balance it in the front will likely result in worse handling than you have now. I added their splitter and skirts w/o the spoiler. Result was not good.

dvandentop

good lord that is speedin at road america big ***** for sure

davidfarmer

What kind of wing angle does that chart show for the GTC500??? If wing is legal for your application, you can run it with Zero angle and still get more downforce and less drag than a spoiler.

any info on the Ron Fellows spoiler??? It's pretty short, but has the taller center!

Hexus

Around 62 kg. This is my second solution to Katech. GTC500 is quiet big and it is hard to use trunk with it in real life.

Ron Fellows spoiler will produce less downforce then Callaway I guess as it's big central part is in trunk aerodynamic shadow.

0Anthony @ LGMotorsports

Something to think about here......

Corvettes in generally will have a high speed push problem, and generally need more front than rear. A wing, or even really aggressive rear spoiler with no front to balance it out would not work that well.