Aero for 180 TW tires.
10-05-2018, 09:00 PM
#1
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Aero for 180 TW tires.
i run is a series where the required tire is a DOT spec 180 TW. Are there any considerations when applying aero when the tire is limited to DOT 180 TW.
I asked this question on the " Show your DIY areo" thread and Emilio suggested I post it as a new thread subject.
I asked this question on the " Show your DIY areo" thread and Emilio suggested I post it as a new thread subject.
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10-05-2018, 09:12 PM
#2
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I'm not an aero expert, but my intuitive response is that aero strategy does not depend on tread wear rating. The objective of aero is to provide as much downforce as possible; if you have sticky tires, so much the better. Friction force is a linear function of force perpendicular to the road surface (downforce), and the coefficients of friction of the tire and road surfaces (tread wear and road material/surface finish). Increasing either one increases the force that the tires can exert on the road.
So, the short answer is, do the same aero things as you would do for any other tread wear to maximize downforce.
So, the short answer is, do the same aero things as you would do for any other tread wear to maximize downforce.
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10-06-2018, 11:09 AM
#7
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We we are waiting for the 2019 rules package before making any decisions but wanted to start doing the google/forum research. We are sure that aero should be applied to each car and wanted to get some additional input.
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10-06-2018, 11:46 AM
#8
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Sprint race car's primary objective is to go as fast as possible. Enduro car's primary objective is to complete as many laps as possible in a given timeframe.
Thus, the enduro car is trying to go as fast as possible, while using as little fuel as possible to limit the required number of fuel stops. To do this, you need to burn as little fuel as possible, and waste as little of the energy generated as possible. Everything on an enduro car should be designed to this end.
For the most part, horsepower generated is equivalent to fuel burned, so a very well-tuned engine is where you start, but there's lots more to be gained in wasting less of that energy.
Thus, the question you should be asking is not "what aero is best for 180tw", but instead "How do I make my aero package as efficient as possible"
Thus, the enduro car is trying to go as fast as possible, while using as little fuel as possible to limit the required number of fuel stops. To do this, you need to burn as little fuel as possible, and waste as little of the energy generated as possible. Everything on an enduro car should be designed to this end.
For the most part, horsepower generated is equivalent to fuel burned, so a very well-tuned engine is where you start, but there's lots more to be gained in wasting less of that energy.
Thus, the question you should be asking is not "what aero is best for 180tw", but instead "How do I make my aero package as efficient as possible"
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10-06-2018, 12:57 PM
#9
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Sprint race car's primary objective is to go as fast as possible. Enduro car's primary objective is to complete as many laps as possible in a given timeframe.
Thus, the enduro car is trying to go as fast as possible, while using as little fuel as possible to limit the required number of fuel stops. To do this, you need to burn as little fuel as possible, and waste as little of the energy generated as possible. Everything on an enduro car should be designed to this end.
For the most part, horsepower generated is equivalent to fuel burned, so a very well-tuned engine is where you start, but there's lots more to be gained in wasting less of that energy.
Thus, the question you should be asking is not "what aero is best for 180tw", but instead "How do I make my aero package as efficient as possible"
Thus, the enduro car is trying to go as fast as possible, while using as little fuel as possible to limit the required number of fuel stops. To do this, you need to burn as little fuel as possible, and waste as little of the energy generated as possible. Everything on an enduro car should be designed to this end.
For the most part, horsepower generated is equivalent to fuel burned, so a very well-tuned engine is where you start, but there's lots more to be gained in wasting less of that energy.
Thus, the question you should be asking is not "what aero is best for 180tw", but instead "How do I make my aero package as efficient as possible"
i believe a good starting point is the areo package used by the Supermiata S1 cars. Any more than that could impact the efficiency as you pointed out. Is this a fair assessment?
And yes these are endurance cars.
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10-06-2018, 02:13 PM
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Supermiata S1 is a good start. Limit your splitter stickout to 3-4" at most. Make sure the front tires are completely shielded. If your rules allow, get spats on the rear quarterpanels to shield the rear tires. Get rid of the side mirrors and move to shielded convex mirrors. Invest money in a good wing. The Singular APR GT-250 setup is the best low-drag aerofoil on the market today. Don't run more tire or wheel than you need to - unless the car has 300whp you don't need a 245 in an enduro environment. Make sure you have hood vents. Limit the frontal opening so that you don't have more airflow than is absolutely required to the radiator.
From there, just focus on details. Shield the tires, reduce frontal area, reduce drag.
From there, just focus on details. Shield the tires, reduce frontal area, reduce drag.
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10-06-2018, 07:27 PM
#11
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Supermiata S1 is a good start. Limit your splitter stickout to 3-4" at most. Make sure the front tires are completely shielded. If your rules allow, get spats on the rear quarterpanels to shield the rear tires. Get rid of the side mirrors and move to shielded convex mirrors. Invest money in a good wing. The Singular APR GT-250 setup is the best low-drag aerofoil on the market today. Don't run more tire or wheel than you need to - unless the car has 300whp you don't need a 245 in an enduro environment. Make sure you have hood vents. Limit the frontal opening so that you don't have more airflow than is absolutely required to the radiator.
From there, just focus on details. Shield the tires, reduce frontal area, reduce drag.
From there, just focus on details. Shield the tires, reduce frontal area, reduce drag.
Thanks for the run down Savington. Could you elaborate on the rear quarter panel spats. Would these be forward of the tire?
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10-08-2018, 11:21 AM
#14
i think he is referring to something like the last picture on this post:
https://www.miataturbo.net/build-thr...3/#post1407422
https://www.miataturbo.net/build-thr...3/#post1407422
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10-08-2018, 01:45 PM
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He is saying mount a convex mirror inside the car off of the door frame near the a-pillar and protected from the airflow. You don't want something hanging out there in the breeze creating drag.
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10-08-2018, 06:56 PM
#17
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We run no side windows and have naca ducts in the 1/4 glass frames to aid in driver comfort. One car has a light weight top with lexan rear window. Would drag be reduced if the rear window was vented some way? I was thinking of aircraft snap vents.
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10-09-2018, 09:47 AM
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I have heard that venting the rear window has led to faster lap times from several sources. I don't know if they perform better at the top or bottom, but I would guess the top of the window.
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