GT350R Splitter worth it?

[Tomster]

I thought it was worth it, so I added the R splitter. Not a DD, but still drive it in town a bit, so up and down driveways on occasion and so far no issues.

I did balance it with the R rear wing - in my case the version made by Carbon2Carbon, which is said to be an exact replica from an aero perspective. I did the full trunk lid swap so that I could wrap the original one up and store it.

That car is drop dead gorgeous! I'm glad you didn't throw red badging on it. However red Brembos would look nice.

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[MrCincinnati]

I'm sorry, but I'm going to be blunt: your ignorance is showing. You seem a smart person, but you're incorrect on what you think downforce is. Reducing lift is adding downforce. They're the same thing. Whether or not something creates net positive downforce is a different story. Very few road cars do.

Study some fluid mechanics, and in particular how it applies to cars, planes, etc.

Be as blunt as you'd like. Dictionary definition of downforce aside, my point is the front splitter doesn't push the front of the car down.

 

[BmacIL]

Be as blunt as you'd like. Dictionary definition of downforce aside, my point is the front splitter doesn't push the front of the car down.

How do you think the rear wing on a racecar does it? Same way, just different geometry: Pressure differential. The splitter creates higher pressure on the nose of the car, and the delta between it and the low pressure underneath it reduces lift. If the splitter is properly designed, it can raise that differential enough to create net downforce at speed. FYI, the splitter itself isn't used as a main load bearing surface. It has to be sufficiently stiff to maintain its shape at speed due to some of the load being applied there, but the length, angle of attack and height of the splitter are the most critical things.

 

[nastang87xx]

Before this splitter discussion splits out of control and I start splitting this post open with more SPLAT pics of people droppin' painfully large dukes like I did with the politics post, the point really is what components will end up making the car aerodynamically stable at speed and thus, the car needs to be getting sucked, pressed, blown, missionaried, doggy styled, or whatever semantic gymnastics you want to use. Point being: DOWN, not up.

Regardless of how you accomplish this, downforce, negative pressure differential, positive pressure delta, underbelly smoothing etc etc, splitters, canards, and wings will help. Finding that balance is going to be more important than net lbs of downward force.

I think based on what I can find, a good balance for a GT350 Track or Tech car WITHOUT the R splitter is custom canards and an APR Drag wing or double canards and an APR GTC-300 wing or and R wing.

 

[MrCincinnati]

FYI, the splitter itself isn't used as a main load bearing surface.

This is my point.

Sure the dictionary definition of downforce is as you state. What I am attempting to clarify is the splitter is not causing the car to be pushed down. It's preventing it from being raised up. Yes, that's an increase to downforce - but there's no pushing downward involved... aside from the unremarkable amount of load already noted.

 

[honeybadger]

Before this splitter discussion splits out of control and I start splitting this post open with more SPLAT pics of people droppin' painfully large dukes like I did with the politics post, the point really is what components will end up making the car aerodynamically stable at speed and thus, the car needs to be getting sucked, pressed, blown, missionaried, doggy styled, or whatever semantic gymnastics you want to use. Point being: DOWN, not up.

Regardless of how you accomplish this, downforce, negative pressure differential, positive pressure delta, underbelly smoothing etc etc, splitters, canards, and wings will help. Finding that balance is going to be more important than net lbs of downward force.

I think based on what I can find, a good balance for a GT350 Track or Tech car WITHOUT the R splitter is custom canards and an APR Drag wing or double canards and an APR GTC-300 wing or and R wing.

First - :clap2::clap2::clap2:

Second- If you get something started/working in regards to the canard, I'd love to grab a set or get involved.

 

[MrCincinnati]

Second- If you get something started/working in regards to the canard, I'd love to grab a set or get involved.

same.

 

[MrCincinnati]

Before this splitter discussion splits out of control and I start splitting this post open with more SPLAT pics of people droppin' painfully large dukes like I did with the politics post, the point really is what components will end up making the car aerodynamically stable at speed and thus, the car needs to be getting sucked, pressed, blown, missionaried, doggy styled, or whatever semantic gymnastics you want to use. Point being: DOWN, not up.

Funny but - having a polite discussion/disagreement doesn't require moderation or disruption.

The reason it's important to sort out the back and forth is because of the implied results of the OP's question: how much downforce does <the R> front splitter generate... because the splitter itself isn't load bearing in any meaningful way - the amount of downforce generated by adding it is dependent on more than just the splitter... i.e. - what's the ride height?

 

[Austinj427]

This is my point.

Sure the dictionary definition of downforce is as you state. What I am attempting to clarify is the splitter is not causing the car to be pushed down. It's preventing it from being raised up. Yes, that's an increase to downforce - but there's no pushing downward involved... aside from the unremarkable amount of load already noted.

That does increase down force.. You don't need a physical wing adding pressure above the car. If a piece of bodywork can push air around it or above it to decrease the pressure below, it increases down force, which overall pushes the car down.

Side skirts do this same thing, they don't actually push it down, but they increase down force, same with rear diffusers. They evacuate air under the car more quickly creating a lower pressure, which helps increase down force.

 

[MrCincinnati]

That does increase down force..

You do realize you quoted me to tell me something I wrote in the reply you quoted?

 

[Austinj427]

You do realize you quoted me to tell me something I wrote in the reply you quoted?

I guess I'm trying to get you to see the full picture of what you already said wasn't the case.

Splitter = Increases down force

 

[MrCincinnati]

I guess I'm trying to get you to see the full picture of what you already said wasn't the case.

Splitter = Increases down force

..and you've done this for a second time now. Perhaps you should completely read what I've written (and you've quoted) before attempting to fill out any more pictures.

Have a good day.

 

[Austinj427]

..and you've done this for a second time now. Perhaps you should completely read what I've written (and you've quoted) before attempting to fill out any more pictures.

Have a good day.

I'm trying to decide if I have enough time at work to quote and point out where you mentioned the splitter doesn't increase down force (first comment), and where you moved backwards from that point to say that it does, but it's more than once piece of the puzzle (last one).

Fact of the matter is, it will. Even without making other adjustments it's still going to create a greater difference in pressure on the nose of the car, which plenty of people would want.

 

[nastang87xx]

The reason it's important to sort out the back and forth is because of the implied results of the OP's question: how much downforce does <the R> front splitter generate... because the splitter itself isn't load bearing in any meaningful way - the amount of downforce generated by adding it is dependent on more than just the splitter... i.e. - what's the ride height?

I'd be willing to be the air evacuating out of the hood through the front vent and the cowl has as much affect as the base splitter. Pressure in the engine bay is a huge deal, even if the underside has been covered substantially like the GT350 or the Z06.

 

[MrCincinnati]

I'd be willing to be the air evacuating out of the hood through the front vent and the cowl has as much affect as the base splitter. Pressure in the engine bay is a huge deal, even if the underside has been covered substantially like the GT350 or the Z06.

I wouldn't doubt it, but those calculations are beyond me.

Unrelated -- thanks to this forum I'm so nervous about oil leaks that I now have the very strange (in appearance at least) habit of taking a deep smell of that hood vent when I park the car at home after a drive. :headbonk: :doh: :ford:

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