The spats and Canards will also help draw air from the front wheel wells and help a little bit with brake cooling as the air going under the front splitter will go to the lower pressure wheel well. By having a lower wheel well pressure also helps with front downforce and will also mildly help speed up the air going under the front splitter. If you have a flat bottom floor as well, you can have a positive rake over the car and the air will help the car be sucked to the ground. The air needs to be sped up again for the rear diffuser. Fins on the under the side of the floor in front on the rear tyres, creating a sort of tear drop shape can help accelerate the air flow to the rear diffuser and help with downforce. Obviously a fin based arrangement is quite difficult to achieve as you can hit them on things if you are not careful. Basically at this point you are beginning to run into a situation where you are looking at skirts for the whole under side. But a flat bottom floor by itself can really make a huge difference in keeping the laminar air flow intact. Great videos FM, I have just recently got myself a mint NB SE or MazdaSpeed as you guys call it and I am beggining my love for the MX5 once again after selling my 94na clubmam some years ago, which was one of my biggest regrets. I race and drive an LMP3 Sports prototype, but I love the Miata/MX5 platform, so much fun for a slower pace.
It's really fun to play with, literal string lines! We should have had a stock Miata parked next to this one to show the change in behavior. We didn't have enough room to park both cars in this shop and still have room to move around them well enough, unfortunately.
@@FlyinMiataVideo that would be very cool to see! A large deterrent of home-garage produced functional aero parts is lack of wind tunnel or cfd availability. This tool bridges the gap with beautiful simplicity. I'm building one!
Wow the .most educational aerodynamics video on TH-cam it's really helpful knowledge and understanding it's perpose of each design and device on any car
I built some of these spats using old polyurethane rally style mudflaps that I used to run when my NA was stock ride height. They have held up great after multiple track days.
Great vid, very interesting and simple to understand! I use to say - "no wing without a splitter" on a track car. 18:30 on the street it´s very effective on cutting feet off!
Love this. You guys should try to calculate the effect on drag coefficent the spats make by doing the test where you speed up to a particular speed and put the car in neutral and time how long it takes to coast from 70mph to 65mph. There is a calculation then to determine aproximate the drag coefficient. It may not be extremely accurate but its useful to compare differences between the spats on and off. My current project is to reduce drag on my NB. Mainly for reduced cabin noise on the freeway. (Im also looking into noise cancelling the buzzing/humming of tire and engine noises using the car's existing speakers and just adding a microphone behind the dash near the firewall)
curious as to how far you’ve gone in reducing drag? I have an NB, looking to get the spats installed. A fastback hardtop might actually be a good idea for this purpose.
Thinking of spats... do the ones on the rear of the car (that come with the stock bumper) have any effect? Is there truly a 'parachute' effect with the stock rear bumper (hence why people do the 'bumper cut'?)
Do you mean the rear skirt that was on some NAs? Not sure what you mean by spats on the rear. We've never tried to determine if the rear bumper skin is acting as a parachute. The cut is more likely an attempt to make something that looks like a diffuser, but without the undertray that makes it actually work or understanding of why the rear bumper might be cut that way.
It really depends on your driving surface e.g., smooth track, city speed humps, or something offroady, but in general, the lower the better since you want the least amount of air under it. My rally setup is pretty close to 7" but I'm sure most setups for the street are going to be closer to 5".
A Porsche technical engineer was asked why Porsche race cars don't have large rear wings, and he said they actually caused more drag in their wind tunnel tests.
Wings almost invariably cause more drag - but they also generate downforce which means greater cornering speeds. The trick is to balance the loss of straight line speed so that it is less than the increase in cornering speed. Basically, keep adding more wing until the lap times stop getting faster! The correct amount of wing is going to depend on the circuit.
My garage vary canards completely changed the look off the front end on my NB2. Cant say anything about aero improvements the car only sees streets and couple autox a yr. But totally up'd the street cred
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I could listen to Keith talk about aerodynamics for days!!
Love these technical videos from you, Jeremy and the others. Great to get your experience and insight. More please....
Thanks Phil! Any specific topics you'd like to see us cover?
The spats and Canards will also help draw air from the front wheel wells and help a little bit with brake cooling as the air going under the front splitter will go to the lower pressure wheel well.
By having a lower wheel well pressure also helps with front downforce and will also mildly help speed up the air going under the front splitter.
If you have a flat bottom floor as well, you can have a positive rake over the car and the air will help the car be sucked to the ground. The air needs to be sped up again for the rear diffuser.
Fins on the under the side of the floor in front on the rear tyres, creating a sort of tear drop shape can help accelerate the air flow to the rear diffuser and help with downforce.
Obviously a fin based arrangement is quite difficult to achieve as you can hit them on things if you are not careful.
Basically at this point you are beginning to run into a situation where you are looking at skirts for the whole under side.
But a flat bottom floor by itself can really make a huge difference in keeping the laminar air flow intact.
Great videos FM, I have just recently got myself a mint NB SE or MazdaSpeed as you guys call it and I am beggining my love for the MX5 once again after selling my 94na clubmam some years ago, which was one of my biggest regrets.
I race and drive an LMP3 Sports prototype, but I love the Miata/MX5 platform, so much fun for a slower pace.
Thanks for watching! I'm sure you get to see some great returns on proper aero design on your LMP car. The Miata....well, it has other attributes😁
Love the string visualizer tool, its like a home wind tunnel!
It's really fun to play with, literal string lines! We should have had a stock Miata parked next to this one to show the change in behavior. We didn't have enough room to park both cars in this shop and still have room to move around them well enough, unfortunately.
@@FlyinMiataVideo that would be very cool to see! A large deterrent of home-garage produced functional aero parts is lack of wind tunnel or cfd availability. This tool bridges the gap with beautiful simplicity. I'm building one!
Wow the .most educational aerodynamics video on TH-cam it's really helpful knowledge and understanding it's perpose of each design and device on any car
Thanks for watching!
I built some of these spats using old polyurethane rally style mudflaps that I used to run when my NA was stock ride height. They have held up great after multiple track days.
Just saw racing the rock.. epic. Bummer about that relay.
Great vid, very interesting and simple to understand! I use to say - "no wing without a splitter" on a track car.
18:30 on the street it´s very effective on cutting feet off!
Love this. You guys should try to calculate the effect on drag coefficent the spats make by doing the test where you speed up to a particular speed and put the car in neutral and time how long it takes to coast from 70mph to 65mph. There is a calculation then to determine aproximate the drag coefficient. It may not be extremely accurate but its useful to compare differences between the spats on and off.
My current project is to reduce drag on my NB. Mainly for reduced cabin noise on the freeway. (Im also looking into noise cancelling the buzzing/humming of tire and engine noises using the car's existing speakers and just adding a microphone behind the dash near the firewall)
curious as to how far you’ve gone in reducing drag? I have an NB, looking to get the spats installed.
A fastback hardtop might actually be a good idea for this purpose.
Love these vids!
More to come!
Thanks, Keith!
Love the video and easy to understand. Thanks!!
Thinking of spats... do the ones on the rear of the car (that come with the stock bumper) have any effect? Is there truly a 'parachute' effect with the stock rear bumper (hence why people do the 'bumper cut'?)
Do you mean the rear skirt that was on some NAs? Not sure what you mean by spats on the rear.
We've never tried to determine if the rear bumper skin is acting as a parachute. The cut is more likely an attempt to make something that looks like a diffuser, but without the undertray that makes it actually work or understanding of why the rear bumper might be cut that way.
On the Cadillac those were called Fender Skirts that are over the rear wheels.
Do typically aftermarket side skirts have any effect?
Love these "theory of" videos. I was just wondering what tires you are running on that car.
They're the Maxxis RC-1 in a 245/40-15 on a 15x9 Kogeki wheel. The car was set up for street use before we bolted the aero on for this video.
What do you like for a distance off the ground for the splitter?
It really depends on your driving surface e.g., smooth track, city speed humps, or something offroady, but in general, the lower the better since you want the least amount of air under it. My rally setup is pretty close to 7" but I'm sure most setups for the street are going to be closer to 5".
A Porsche technical engineer was asked why Porsche race cars don't have large rear wings, and he said they actually caused more drag in their wind tunnel tests.
Wings almost invariably cause more drag - but they also generate downforce which means greater cornering speeds. The trick is to balance the loss of straight line speed so that it is less than the increase in cornering speed. Basically, keep adding more wing until the lap times stop getting faster! The correct amount of wing is going to depend on the circuit.
What are your thoughts on cutting the rear bumper for drag?
Cutting it to install a diffuser would likely be effective. We've never tested how much drag it actually produces.
Would you recommend the splitters for autocross?
It would have to be fairly big to be effective. I can see cutting some cones in half :)
Spitters and splats🤣
Try saying that 5 times fast!
My garage vary canards completely changed the look off the front end on my NB2. Cant say anything about aero improvements the car only sees streets and couple autox a yr. But totally up'd the street cred