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with current car design yes the cd usually below 0.35.. and also yes current car design should give better stability for high speed cruising. the cd value usually u can get by run experiment on it and i think there is explanation in ref book that I post earlier.. most of aerodynamic aid that need to be add (based on the ref) more to contribute in high speed cornering rather than top speed because it create more drag and load to the car.. and there is something to compromise in aerodynamic factor If U want to develop a race car.. better extra aerodynamic aid will improve speed cornering but also will reduce top speed on the other hand, less aerodynamic aid gain in top speed but less effective in top speed cornering..
and thats why the Bugatti Veron (betul ke aku eja heheh) when they need extra top speed they will reduce or remove the spoiler to reduce the drag... and just now I remember about top speed of the car that can be achieve relate to the force needed to overcome by the vehicle to move...
for example If ur car have already remove speed cut and rev cut.. and ur car can clock top speed about 260kmh but cannot go much faster. it is because the force needed to overcame by vehicle that acting on ur car already exceed the power of ur engine can deliver.. so to improve ur top speed there is 2 way, which is improve ur engine h.p in high rev and second reduce car drag, load... to reduce car drag actually 1 way is the easiest which is smooth ur car skin body.. u can polish it or wax it and I believe u wira evo can go a little bit faster.. U can change final gear ratio to get more top speed if last time condition met the condition as follow: the max engine rev (for the top speed) is more that max h.p rev (based on power curve on dyno chart) for previous gear ratio. n if not ur car only get much slower in top speed.. if I not mistaken....
to think it back..do stock car need all the spoiler and extra aerodynamic effect? :hmmmmm:

<blockquote data-quote="dabok max7" data-source="post: 4485864" data-attributes="member: 101654">with current car design yes the cd usually below 0.35.. and also yes current car design should give better stability for high speed cruising. the cd value usually u can get by run experiment on it and i think there is explanation in ref book that I post earlier.. most of aerodynamic aid that need to be add (based on the ref) more to contribute in high speed cornering rather than top speed because it create more drag and load to the car.. and there is something to compromise in aerodynamic factor If U want to develop a race car.. better extra aerodynamic aid will improve speed cornering but also will reduce top speed on the other hand, less aerodynamic aid gain in top speed but less effective in top speed cornering..and thats why the Bugatti Veron (betul ke aku eja heheh) when they need extra top speed they will reduce or remove the spoiler to reduce the drag... and just now I remember about top speed of the car that can be achieve relate to the force needed to overcome by the vehicle to move...for example If ur car have already remove speed cut and rev cut.. and ur car can clock top speed about 260kmh but cannot go much faster. it is because the force needed to overcame by vehicle that acting on ur car already exceed the power of ur engine can deliver.. so to improve ur top speed there is 2 way, which is improve ur engine h.p in high rev and second reduce car drag, load... to reduce car drag actually 1 way is the easiest which is smooth ur car skin body.. u can polish it or wax it and I believe u wira evo can go a little bit faster.. U can change final gear ratio to get more top speed if last time condition met the condition as follow: the max engine rev (for the top speed) is more that max h.p rev (based on power curve on dyno chart) for previous gear ratio. n if not ur car only get much slower in top speed.. if I not mistaken....to think it back..do stock car need all the spoiler and extra aerodynamic effect? :hmmmmm:</blockquote>

[QUOTE="dabok max7, post: 4485864, member: 101654"] with current car design yes the cd usually below 0.35.. and also yes current car design should give better stability for high speed cruising. the cd value usually u can get by run experiment on it and i think there is explanation in ref book that I post earlier.. most of aerodynamic aid that need to be add (based on the ref) more to contribute in high speed cornering rather than top speed because it create more drag and load to the car.. and there is something to compromise in aerodynamic factor If U want to develop a race car.. better extra aerodynamic aid will improve speed cornering but also will reduce top speed on the other hand, less aerodynamic aid gain in top speed but less effective in top speed cornering.. and thats why the Bugatti Veron (betul ke aku eja heheh) when they need extra top speed they will reduce or remove the spoiler to reduce the drag... and just now I remember about top speed of the car that can be achieve relate to the force needed to overcome by the vehicle to move... for example If ur car have already remove speed cut and rev cut.. and ur car can clock top speed about 260kmh but cannot go much faster. it is because the force needed to overcame by vehicle that acting on ur car already exceed the power of ur engine can deliver.. so to improve ur top speed there is 2 way, which is improve ur engine h.p in high rev and second reduce car drag, load... to reduce car drag actually 1 way is the easiest which is smooth ur car skin body.. u can polish it or wax it and I believe u wira evo can go a little bit faster.. U can change final gear ratio to get more top speed if last time condition met the condition as follow: the max engine rev (for the top speed) is more that max h.p rev (based on power curve on dyno chart) for previous gear ratio. n if not ur car only get much slower in top speed.. if I not mistaken.... to think it back..do stock car need all the spoiler and extra aerodynamic effect? :hmmmmm: [/QUOTE]

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