My car is overall balanced, but high speed corner entry feels understeer, so spent some time during 7/4 week to build a front splitter.
Test it last weekend at NJMP lightning course which has high speed corners and connects to long straight. With the upgraded tires, I expected at least 1.5s faster than my best record, but ended up only half sec faster. I would like to have your advice on my splitter setup, the current setup may give me negative impact.
- It is 4" extended from the edge of the bottom lip
- The ground clearance probably around 4".
- It is parallel with the group when static
- There is a ~1” gap between the splitter & bottom of the bumper to let air go through. This is my main concern, I will build something to close the gap.

 

Do you have any additional aero? 1 piece by itself usually won't do much.

 

what's the weight on it?

 

this is the only one for the front, what else do I need? Rear wing use GTC200, I can tell differences when take it off with the same setup.

 

didn't weight, probably 15 lbs I guess.

 

You for SURE want to close that splitter to bumper gap w an air dam piece.

 

Just bought a bumper lip, hopefully it will fix the gap and seat right on the wood splitter.

 

Anything over 3 inches from the ground is pretty much considered useless

 

Can't wait to start doing string tests on mine.. And then seeing what it actual does to turn in etc, different speeds etc.. Time to break stuff I suppose.

 

http://speed.academy/wind-tunnel-tes...350z-uoit-ace/

I'm curious how a wide body affects the Z. I know Sasha's Z has the Rocket Bunny fender flares now. He is the only member I've seen test his Z in a wind tunnel but that was when it was OE body.



Added this one just cuz I enjoyed watching it so much.

 

I saw all his videos, revisited the 1st one yesterday. It is amazing to make front downforce from 3% to 50% with some adjustments. without test and tune, it's so hard to find out how the aeros affect the car.

 

mine is 4.5" measured yesterday. Why it is useless if over 3"? any article support this assumption?

 

Ineffective and allows to much air under the car.

High speed corners are fun with a splitter, especially if there are bumps or waves in the pavement. As the splitter gets closer to the ground it creates more downforce, a midcorner bump can be felt. Also a slight press of the brakes on turn-in will change dynamics a bit more than before

 

Isn't more air flow underneath the car increase the speed of the flow and cause low pressure to increase overall downforce? or maybe adjust the splitter angel to have the front lip closer to the ground, not sure if that would help.
trail brake does help my turn in a lot, but I would assume a functional front splitter will help dramatically for a large sweeping corner like the last corner of NJMP lightning

 

 

 

Thanks for sharing, good to see. will do more research ~~

 

installed ebay front lip. fill the gaps and seat right on top of the plywood splitter. Since it's not perfect level, there are small gaps here and there. I will tape the brake duct & side marker next time. what do you guys think?

 

Nice start for sure. I think some garden edging may be a better option than that Ebay lip. It should close the gaps much better as well as leave more of the splitter surface which I believe would create more high pressure on top creating more downforce.
Battleaero just released a pretty stout looking splitter which I ordered. Once it comes in I'll modify it to suit ST4 rules as well as add a vertical dam (which I'm thinking to use garden edging for.) Heck I may just use their brackets and make a whole new splitter.

 

Read a lot of aero article, built a air dam for $6. Have a last event this year, will see if it works.