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CitroX 07-07-2013 05:52 PM

Streamlined Citroen ZX
 
Good day, ecomodders!

Here is my latest project - Citroen ZX.

http://imageshack.us/a/img43/2609/d0dp.jpg

http://imageshack.us/a/img854/6787/9lqe.jpg

This was actually the experimental part of my master thesis. I needed to analyse how drag affects a moving vehicle and how it's aerodynamics could be improved. So here is what I did. Firstly I created a rough model using Autocad.

http://imageshack.us/a/img546/4031/gil3.jpg

Then tested it with Autodesk CFD Project Falcon

http://imageshack.us/a/img854/2346/woq7.jpg

Then did the modifications and here is the final model

http://imageshack.us/a/img545/5233/l6lo.jpg

Put it in the CFD and got a Cd of 0.23

http://imageshack.us/a/img594/7736/h72h.jpg

NOW here is the interesting experimental part. The build began from the underside. Policarbonate and sheet metal was used

http://imageshack.us/a/img837/9991/s0u3.jpg

Then the boat tail construction started
http://imageshack.us/a/img856/8240/qjs9.jpg

http://img198.imageshack.us/img198/1258/ut2f.jpg

Boat tail underside made from textolite
http://img844.imageshack.us/img844/3258/ysqq.png

First test run early in the morning
http://img811.imageshack.us/img811/4848/fm08.jpg

Tuft testing

https://scontent.xx.fbcdn.net/hphoto...92&oe=570568F7

Covered the rear wheel arches, partially blocked radiator ventilation and covered the fog lights + some final touches. And I give You the final result

https://scontent.xx.fbcdn.net/hphoto...d2&oe=570D6665

https://fbcdn-sphotos-e-a.akamaihd.n...57862439_n.jpg

https://fbcdn-sphotos-b-a.akamaihd.n...83768874_n.jpg

http://img441.imageshack.us/img441/1669/0e6x.jpg

https://scontent.xx.fbcdn.net/hphoto...53&oe=573C9B0C

https://scontent.xx.fbcdn.net/hphoto...33&oe=570FA119

The summary

The master thesis was graded as almost perfect. So first mission accomplished. Due to the lack of time and money the detail of this project could have been better.

Currently I've removed all of the mods to adjust the brakes fix the clogged exhaust system and to make the car mechanically sound so to pass the mandatory checkup.

The fuel consumption

Orginal car ABA testing did 31.36mpg @ 56mph (speed limit).

Modified car same road same speed but warmer weather did 49mpg. This mpg increase is very close to the one that was theoretically estimated. Yet currently Citroen without the mods is showing a significant increase in mpg compared with the old testing. This might be due to the exhaust system fix and the warmer weather we are having right now.

Future plans

Make the boat tail shorter and more practical. Connect to the ECU to take control of the fuel mixture.

If you took the time to read this
You are awesome.Feel free to like and share my FB page. http://www.facebook.com/flylowlt

JRMichler 07-07-2013 09:12 PM

Warmer weather definitely improves mileage. My sig line has some numbers.

CitroX 07-10-2013 05:25 PM

I started to put the car back together today. Since I have a bit more time now I can test more modifications individually. But before putting the flat bottom back on I've decided to see what difference in mpg would a front splitter make which I had laying in my garage from a rs fiesta.
http://img22.imageshack.us/img22/1247/17qh.jpg

CitroX 07-11-2013 05:31 AM

I forgot to add tuft testing of the final model in the first post. Unfortunately the camera focused on the windscreen when we were filming yet the tufts are still visible. The mods did a major difference in airflow.

AndrzejM 07-12-2013 05:11 AM

Nice project! I like it! Do you think that you don;t have trouble because of a boat tail from the cops?

modproductions 07-12-2013 10:37 AM

Hi,

wow you have done a lot of work on this car.

If you want to modify it, I suggest you to make it narrower at the back. It will be better with side wind.

CitroX 07-12-2013 11:25 AM

Quote:

Originally Posted by AndrzejM (Post 380167)
Nice project! I like it! Do you think that you don;t have trouble because of a boat tail from the cops?

It is allowed to have one meter+ of cargo to be sticking out of the car as long as it is secured, marked and not draging or anything :)

Quote:

Hi, wow you have done a lot of work on this car.
If you want to modify it, I suggest you to make it narrower at the back. It will be better with side wind.
I will try to redesign it a bit. I'll see what kind of a compromise i can work out. And I want to make the whole thing neater, use less white wrap :thumbup:

Cd 07-12-2013 05:49 PM

You did a fantastic job not only with the car, but with your post here on EM.
All the information is nice and neat and you did all the testing that is usually done and showed your results.

The final results look very much like a factory show car from the 1980s back when good aerodynamics actually brought bragging rights.

http://www.powerful-cars.com/images/...obe-iii-14.jpg

mikeyjd 07-13-2013 09:13 PM

Great work and welcome to ecomodder :)

CitroX 07-14-2013 07:28 AM

Quote:

Originally Posted by Cd (Post 380261)
You did a fantastic job not only with the car, but with your post here on EM.
All the information is nice and neat and you did all the testing that is usually done and showed your results.

The final results look very much like a factory show car from the 1980s back when good aerodynamics actually brought bragging rights.

http://www.powerful-cars.com/images/...obe-iii-14.jpg

Wow,I knew that ford sierra was aerodynamic at the time but this prototype is full of 80's goodness. That is some good inspiration for the project and it has the wheel fairings which I would like to install.

Quote:

Great work and welcome to ecomodder
Thank's Mike :thumbup:


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