how do i find out drag coefficient, cd-drag, cd-area, of my 99 civic hatch? or better yet of a stock 99 civic type r/spoon 99 civic type r (cause thats basically what i have as far as exterior mods). i searched the archives and yahoo but could not find anything.

 

ttt

 

measure the projected frontal area of the car (which would be alittle difficult)
the coefficient cd will be somewhere around .43 one of my sources says for a typical american sedan. thats the closest number i have.

then force=0.0025*cd*area*vel^2

 

exactly what i would calc if i had a laser scanning edm....

i think i had the cd of an integra somewhere someone had calced...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">measure the projected frontal area of the car (which would be alittle difficult)
the coefficient cd will be somewhere around .43 one of my sources says for a typical american sedan. thats the closest number i have.

then force=0.0025*cd*area*vel^2</TD></TR></TABLE>

i really appreaciate the response but that is all past my capability

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">exactly what i would calc if i had a laser scanning edm....

i think i had the cd of an integra somewhere someone had calced...</TD></TR></TABLE>

that would be nice if you could find it

 

how is it past your ability?

you cant multiply a few numbers together?

 

cd = 0.32
http://www.theautochannel.com/....html

bottom of page

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Daddy Go Fast &raquo;</TD></TR><TR><TD CLASS="quote">cd = 0.32
http://www.theautochannel.com/....html

bottom of page</TD></TR></TABLE>

from memory the dc2 was like .34-.33 give or take...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">how is it past your ability?

you cant multiply a few numbers together?</TD></TR></TABLE>

i dont know how to measure the frontal area, the highest math ive taken so far is statistics, i can multiply but the values are what confuse me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Daddy Go Fast &raquo;</TD></TR><TR><TD CLASS="quote">cd = 0.32
http://www.theautochannel.com/....html

bottom of page</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">from memory the dc2 was like .34-.33 give or take...</TD></TR></TABLE>

thanks all i need now is the frontal area. i read somewhere 1.9 meters^2 but it did not specify year of the civic hatch.


Modified by blinx9900 at 10:06 AM 3/28/2007

 

a decent estimate would do you just fine.

what are you hoping to accomplish anyways?

 

so what about the 92-95 hatch?

 

got some people on board with this...get me a nice picture of your car in the biggest resolution possible....

also this picture needs to be about 1-2' off the ground square to the front end of the car...centered and flat on the horizion surface...

then i should be able to calc out you frontal area (haha) and calc it out for ya

 

a pic just like this...a lil bit lower

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">a decent estimate would do you just fine.

what are you hoping to accomplish anyways?</TD></TR></TABLE>

honestly im not 100% sure, i just got aem ems and my tuner has some dyno program that he wants to test out so he asked me to find out hte cd drag and area of my car.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bense &raquo;</TD></TR><TR><TD CLASS="quote">so what about the 92-95 hatch?</TD></TR></TABLE>

huh? and bense i was thinking of you yesterday when my tranny went into 1st at 80mph and i went like 12,000+rpms, but thats another thread.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drumking15 &raquo;</TD></TR><TR><TD CLASS="quote">a pic just like this...a lil bit lower </TD></TR></TABLE>
pic not loading, thanks a lot for the offer though thats really going out of your way if you think a ballpark is good enough i could just use the 1.9^2 meters i found.

 

the bigger the picture the better...i could calc it out w/in a reasonable number......

 

you should probably also have him put a 12" ruler in the pic, so you could then photoshop a grid in there.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">you should probably also have him put a 12" ruler in the pic, so you could then photoshop a grid in there.</TD></TR></TABLE>
pshhh license plates are standard size...i was gonna scale it by that

 

the example pic is not loading for me

 

http://www.mayfco.com/tbls.htm
bam. good link

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dfoxengr &raquo;</TD></TR><TR><TD CLASS="quote">http://www.mayfco.com/tbls.htm
bam. good link</TD></TR></TABLE>

awesome, too bad no newer cars though