im picking up an approx 2 inch splitter the end of the month from someone (i think it was actually 2 and 3/8" or something). He started larger and had to trim it down because it was completely overpowering the rear wing. believe he added a bit of rear toe and the car was nice and planted and the rear was stable...we shall see, i should be testing a few things this season.

 

Keep in mind that the larger the front splitter, the more it will reduce your top speed.

 

He was using that front splitter with a stock rear wing. I personally wouldn't recommend a splitter with stock rear wing as the factory aero package is designed to be balanced.

 

There is more to setting up a car then just aero. And, a factory car is setup to understeer.

 

With factory suspension and alignment

 

If your shocks/ springs/ sway bars/ height/ wheels/ tires/ power/ weight…are not stock, the factory aero doesn’t really matter.
I want to run a front splitter and no rear wing

 

I just don't think that saying blanket statements is accurate. There is a lot that depends on other variables. What works for one person might not work for another.

 

^ agree. Aero is just part of the equation for a balanced car setup.

 

You autox or plan to do 140 mph on track? You got more ballz than me then

 

The best way to understand what works and what doesnt is to really study fluid dynamics. Knowing what does what will help with your build and will really help when you need to make adjustments at the track.

 

Andy, how did you determine your splitter made 250lb @160mph? That is not a lot of downforce.

 

its all thanks to my scientific brain. i wanna do some testing with it and see what happens before i add a wing. i had initially wanted to just start with a flat under tray, but im lazy.

 

I said 250+lbs. I've tested my splitter by putting 250lbs on it and the splitter didn’t break, but when I hit my top speed at RA the splitter supports broke. So how much is it really making? I don’t know, but it’s greater than 250lbs of force just on the splitter surface.

The Splitter will also have an effect on the rest of the car by increasing pressure above. So as for total downforce produced by the splitter? I have no idea. only way to test that would be a wind tunnel I suppose.

How much downforce is a lot of downforce for us sedan cars?

 

I need more front end bite with my current setup. On Ohlins DFV's and 275/35-18 competition tires my car tends to push. I like just a slight amount of oversteer available, and ever since getting some real tires under the car I've lost the balance. I feel a splitter + brake cooling guides are going to really help this year, and if I have to go to a composite rear wing so be it. It's a Racecar, not a street car anymore.

 

^ do you have rear diff mod with ACD reflash. That will make the car rotate on throttle very nicely. Its probably the best mod I have on the car.