Page 1 of 2
Rear Diffuser / UNder Tray Diffuser
Posted: Thu Jul 31, 2008 8:15 am
by r34nismo
Can everyone post up some picture of content they have as I am looking at how to develop something for the back/under tray for my car.
Cheers
Posted: Thu Jul 31, 2008 8:51 am
by duncan
here is what mine is going to be based upon:
when I get round to making it
Posted: Thu Jul 31, 2008 9:06 am
by IWANT1
Um where you looking to purchase that fron dunk as i may be slapping one on the evo at some point? They make them for the 7-9 but not the 5-6.
Posted: Thu Jul 31, 2008 9:29 am
by duncan
I will be making it Lee. Not out of carbon though - plain old ally sheet for me.
Posted: Thu Jul 31, 2008 5:38 pm
by r34nismo
I am looking at Ally at the moment much easier to make and mould to what I want.
Will be looking at a complete under tray the full length of the car, the idea is to have some bonnet scoops upside down in the tray to bring air flow into areas that need it ie.
Diff / Geabox and also for rear brake routing....
Posted: Thu Jul 31, 2008 6:47 pm
by duncan
be careful about a full length undertray as it can really upset the engine temperatures.
The best stuff I have seen for the undertray is a aluminium honeycomb - mega strong and mega light.
Posted: Sat Aug 02, 2008 8:33 am
by r34nismo
now thats a good idea for select areas.
Posted: Tue Dec 09, 2008 6:03 pm
by r34nismo
going to be putting through to paper over christmas.
Lets face it not much else going on apart from Drinking
)
Posted: Tue Dec 09, 2008 7:15 pm
by RX7
Here's a link to the rear diffusers on RX7s mate:
http://www.fd3s.net/diffuser/index.html
Posted: Tue Dec 09, 2008 9:41 pm
by RPS13
duncan wrote:here is what mine is going to be based upon:
when I get round to making it
It has been a little while since i did any real aerodynamics, but the angle change on that diffuser looks very aggresive. Air may stall/ break up and make the diffuser less effective, so just be careful it is a real diffuser you copy and not just a piece for show. Most race cars based on production bodies run very shallow angles unles there is a huge rear wing very close to the diffuser interacting with it. Most diffusers on sports and supercars are exagurated for looks over real performance. The rule of thumb i was taught is 7 degress constant slope angle is safe, 13 degress is the maximum you may get away with without interacting flows.
F430 road car:
and race car:
Covette endurance car:
Very easy to make, but dont forget the loading they create (having seen a few diffusers and splitters colapsing or ripping off the brackets!). 100kg at 100mph should be easy enough to create from a subtle diffuser if you are making a flat floor too.