GettReal

I know there is pretty much only a handful out there that are running a C5 / APR wing combo. I installed the wing over the winter season and a splitter up front. I will most likely do a full under tray but that won't be until maybe mid season. My question is, what AOA setting do you use for the rear? If it matters, I'm running Moton coil overs, pretty stiff setting and driving on Slicks.

I know there are different settings based on certain tracks but I'm sure you all start off with a favourite setting. I run at Mosport and Watkins Glen the most, so high speed tracks where 80-150 is the norm.

From reading the APR site it looks like 0-5 degrees is a good starting number and no more than 10 degrees. It also has a disclaimer these are 3D/Clean air numbers and not real world numbers so thats why I am asking here. What are you seeing in the real world. Thanks.

Steve

J.R.

Steve,

I think you will find those numbers correct. i.e. a 3d wing will not accept the angles a 2d wing will take without drag overcoming downforce. K.C. at APR has some good data on their wing.

The APR wing also seems to work more efficiently at lower heights (i.e. not needing to be above roofline). I had one on my FRC C5 for a number of years and with 3-4 in splitter and undertray the 3-7 deg range seemed to be most efficient depending on track configuration.

I did try extreme angle ie 10-12 degrees once and the difference between that and an approx. 5 deg angle indicated approx. a .5 slower lap time on a 2.2mi., 10 turn course configuration.

z06801

The race engineer at RaceCo (who also works for a ALMS team) a track side race shop at Miller told me that me APR GT500 wing was a ornament and I should try to run without it. So one day I tried it and tried to drive at the same rate, it was terrifying could not put the power down out of corners, spinning tires and unsettled braking and it took longer to bring the tires up. It was doing a lot a couple of pics to show mounting possession. I was definitely off a few seconds without it. It's about 7* AOA

GettReal

Exactly what I was hoping to hear. I will most likely start at 0-5 degrees for now and maybe go up to 7 once the undertray goes on.. Thanks for the reply..

Also a great response because I was told recently the same thing, that it wasn't as good of a wing as others... But when I was at a NASA race at the Glen last year, every single Vette there that was running a rear wing was running an APR, so there must be some real world goodness happening

Thanks guys.

johns68

I'll echo what JR says ... 3-7 degrees seems most effective on my favorite 3 mile, horsepower track. Used with a 2" front splitter until I busted it up ... have adjusted to no front splitter, but it will be back soon, with undertray. Mine is mounted significantly lower than Z06801's is. About roof level on an frc ... maybe just a touch higher.

z06801

Like a lot of things at this level of racing where I mounted mine was a guess but it seems to work well.

johns68

Me too ... but just because it does seem to work well at lower mounting heights (as JR mentioned) doesn't mean it can't work better up in cleaner air like yours.

RX-Ben

It may not be as efficient as others, but it certainly is not an "ornament."