View Full Version : Airflow past rear bumper

29-04-2006, 12:22
I was in bed thinking last night (first time for ages cos I wasn't pissed lol) and I thought about how to make a Clio faster for the same bhp now that theres a few of us running silly stripped.

I got to thinking that when I took the spare wheel and cage off that it has left a huge hole under the car which is blocked off by the backbumper, causing a lot of drag.

So, seen as my tax and insurance run out before the 0-60 do, any chance that one of you can do a couple of runs, then whip the back bumper off and do some more to see if it makes a difference?


29-04-2006, 14:57
Why not utilise the space and create a flat section. It will help smooth the airflow under the car and reduce the drag, and at the sametime increase downforce...OK very minimal but every little helps.

29-04-2006, 15:01
Thats my plan but I want to see if removing the bumper makes any difference first.


29-04-2006, 15:03
lol weld skid plates underneath

29-04-2006, 15:09
Fook that just need a sheet of super thin ally so it doesn't weigh much. Could build a DTM style venturi into the back bumper aswell but it'd look shit if the rest of the car was standard.


29-04-2006, 21:06
If you take it off and put it on I'll do it lol

think mine has rusty bolts holding it on though

30-04-2006, 09:59
if you put a flat rear floor section on you would notice a diff i reckon...as daft as it sounds for a lil clio!

drag is a crazy force like, makes a lot of difference to acln times. at my old work we had a Noble in that was having a full paint job. i drove it to the paint shop bout 250miles away WITH the rear wing. when i picked it up the rear wing WASNT on, and i tell you, the difference was astonishing!!

30-04-2006, 12:03
I can't get to the 0-60 cos i've broken my foot but at the next drag racing meeting i'll take the bumper off for somebody and try it.


30-04-2006, 12:05
If i manage at some point to hook my g-tech up then i'll do a few runs with and without

30-04-2006, 12:09
It should make a difference to the 0-100 time and maybe the 1/4 mile time and terminal speed.