Front bumper shape

[Gone2]

Front end lift is something I have been trying to avoid. I do the bulk of my driving at 60 plus and don't want to have issues sticking to the road. I am trying to bat around a lot of ideas, and reviewing stuff that people have already done to find out what works best. I don't like to do, then redo, then do again.

[Quasimoto]

This is what I did and it paid off with almost 15% increase in FE.

http://ecomodder.com/forum/showthrea...job-17534.html

[Cd]

Originally Posted by Quasimoto

This is what I did and it paid off with almost 15% increase in FE.

http://ecomodder.com/forum/showthrea...job-17534.html

Hmmmm.

[Quasimoto]

Originally Posted by Cd

Hmmmm.

One of your relatives, CD? LOL

[Cd]

Originally Posted by Quasimoto

One of your relatives, CD? LOL

I'm just sayin' if you could indeed get that kind of a mileage increase with a simple rounding of a front end that already has attached flow, I'll gladly be the first to copy your efforts.

Here is an example of the attached flow on the bumper of my car during a tuft test.

[winkosmosis]

Originally Posted by Cd

I'm just sayin' if you could indeed get that kind of a mileage increase with a simple rounding of a front end that already has attached flow, I'll gladly be the first to copy your efforts.

Here is an example of the attached flow on the bumper of my car during a tuft test.

I'd like to see a picture of a front end without attached flow... Following your logic, you could take off the bumper and the whole front fascia, flow will still be attached, and drag won't change.

The problem with the silver bullet nose is that it directs so much air down below the car.

[Cd]

Originally Posted by winkosmosis

A bullet shape funnels air under the car which creates front end lift.

Under ? Don't you mean over ?

Here is a site that has lots of useful information ( be sure to click the links to the other pages ! ) regarding blunt, versus wedge, versus bullet shaped noses.
Lots of good info such as lift and drag coefficients etc.

They even tried testing windshield shapes as well.

Winged Warriors/National B-Body Owners Association - Chrysler Winged Car Development and Testing

[Gone2]

Thanks for the input. I am thinking about putting the front end on hold until I get the hubcaps and wheel skirts finished. I am doing the mirror relocation today, so I will see how I like that. I am not trying to go extreme, but 50+ to the gallon would help my finances out a lot.

[winkosmosis]

Originally Posted by Cd

Under ? Don't you mean over ?

Here is a site that has lots of useful information ( be sure to click the links to the other pages ! ) regarding blunt, versus wedge, versus bullet shaped noses.
Lots of good info such as lift and drag coefficients etc.

They even tried testing windshield shapes as well.

Winged Warriors/National B-Body Owners Association - Chrysler Winged Car Development and Testing

No, I mean under. It's the opposite of an air dam.

[SlideWRX]

Originally Posted by ChazInMT

If you want inspiration for a front end, look at modern current model cars. They seem to be an air dam type thing low, below midheight. The air dam tends to remain flatter out to the sides so it "pushes" the air out away from the messiness that is the front wheels. Above midpoint, it is all rounded radius to start the air on its trip over the top.

Current cars also have a requirement for pedestrian friendly hoods for impact, which has been raising the hoodline at the front.

In direct response to proposed and actual EU legislation, manufacturers are trying to stop pedestrians impacting with hard-points at the front of vehicles. The principle responses are to either raise the bonnet to a stance that better absorbs energy, or to use airbags to cushion against these hard-points. Although these approaches offer a way to maintain existing styling traits, they are unlikely to be as simple or effective as more dramatic changes in vehicle front design.

Car Design Online | Pedestrian Safety