Im not sure if you all know what a coast down test is but its a simple test that allows you to calculate the drag coefficient and the rolling resistance of a car.

Im doing this for a class project i have a 2nd gen rx7 and im going to compare the 1st 2nd and 3rd gen models. What i need from you guys is if any of you can help me get some data for 3rd gens. Heres how the test goes

this test has to be done on a relatively calm day (no wind) and a level road

you need to get your car up to 40 mph and then put it in neutral and time how long it takes to drop to 35 mph
then do the same from 15 mph to 10 mph. thats all.

if a couple of you guys can get me some times that would be great. thanks in advance, i'll post my paper for you guys to read when im done

 

i'll do it tomorrow.


but won't there be alot of variables that would keep you from getting good mesurements? like tire pressure, viscosity of transmission and differential oils? spoilers, body kits, etc.?

I'd say, fill your tires up to max rated pressure, make sure that your car (and hence transmission) fluid is nice and hot to make the results most accurately reflect areodynamic drag instead of other parasitic loss.

 

well the thing is, the formula is supposed to be pretty accurate and it doesnt take any of that into account.
oh and youre supposed to do it a couple times and take and average, but if a couple of you guys do it then i'll just average out all the times. thanks a lot for helpin me out

 

anyone else wana help?

 

bump

 

any luck isuposs?

 

it was all windy and crappy here yesterday. i'll try again today.

 

cool thanks, i was about go to do my test but its raining and windy here so maybe tonight

 

any luck isuposs?