Rear diffusers...let's see them!!!

ImageUploadedByTapatalk1339636944.349333.jpg

Here's my new addition, thanks Difflow!

Bruno
Evolution
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Sent from my iPhone using Tapatalk
 
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wowzers...YES!

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fr_345.jpg
 
RYU said:
wowzers...YES!

fr_344_size640.jpg


fr_345.jpg
Click to expand...

That looks good.... but I think the diffllow one is better in function.

For beginners u can pick the length and fins to ur liking.

A functional diffuser needs to have the end of it being the furthest part of the car towards the rear.
 
BATMANs said:
That looks good.... but I think the diffllow one is better in function.

For beginners u can pick the length and fins to ur liking.

A functional diffuser needs to have the end of it being the furthest part of the car towards the rear.
Click to expand...
in your case you should take yours off :). you only go in a straight line and all this downforce you have is causing drag.

When you show us some lap times then i'll bite ;)
 
BATMANs said:
That looks good.... but I think the diffllow one is better in function.

For beginners u can pick the length and fins to ur liking.

A functional diffuser needs to have the end of it being the furthest part of the car towards the rear.
Click to expand...

are you saying the diflow diffuser is functional.... just asking....
 
Nukem said:
Aside from downforce or other type r replicas. Wouldn't any diffuser be functional?
Click to expand...

no... any diffuser would not be functional...

and if you can move a fin with your finger... an understanding of a diffuser wasent present during the design
 
qu1Z said:
Who's diffuser has fins that move with a finger?
Click to expand...


I'll let you explain yourself rather than I then..

What is the purpose of a fin on a diffuser?

What is considered functional to you in terms of a diffuser?

What I am reffering to in my comment....

I do not feel a fractional decrease in drag equals what a diffuser is designed to do... or in my reference = functionality.

It is true that a rake at the end of a car will create a low pressure system that air will flow upward...

The air traveling under a non-flat bottom car is so turbulant.. a fractional decrease in drag exsists with a diffuser and the rake is the only functioning part.
 
StmpoRaceProducts said:
I'll let you explain yourself rather than I then..

What is the purpose of a fin on a diffuser?

What is considered functional to you in terms of a diffuser?

What I am reffering to in my comment....

I do not feel a fractional decrease in drag equals what a diffuser is designed to do... or in my reference = functionality.

It is true that a rake at the end of a car will create a low pressure system that air will flow upward...

The air traveling under a non-flat bottom car is so turbulant.. a fractional decrease in drag exsists with a diffuser and the rake is the only functioning part.
Click to expand...

I'm not going to argue and get into a flame war over who's diffuser works best. I made a movie for people explaining what fins do, you can watch it here:

http://www.youtube.com/watch?v=q8hIxMzqW0c

EDIT: As for moving a fin with a finger? Sure, it's tough, but it's aluminum. If I tried moving a CF fin, it might crack.
 
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qu1Z said:
I'm not going to argue and get into a flame war over who's diffuser works best. I made a movie for people explaining what fins do, you can watch it here:

http://www.youtube.com/watch?v=q8hIxMzqW0c

EDIT: As for moving a fin with a finger? Sure, it's tough, but it's aluminum. If I tried moving a CF fin, it might crack.
Click to expand...

I'll do the same... FWIW if you can't stand on a front splitter - it isnt functional either - I dont think you make those.. this isnt about your part... but a diffuser is an aerodynamic part and i'm speaking about aero technology and its functionality.


So my point made is a functional diffuser doesnt mildly effect a car... the best visual example I have found for that would be the arta nsx on suzuka many years ago.. rain on the ground was sent almost 100 feet in the air.

<iframe width="420" height="315" src="http://www.youtube.com/embed/8Mqoe7YNPEU" frameborder="0" allowfullscreen></iframe>

Sorry if you felt attacked by that
 
StmpoRaceProducts said:
I'll do the same... FWIW if you can't stand on a front splitter - it isnt functional either - I dont think you make those.. this isnt about your part... but a diffuser is an aerodynamic part and i'm speaking about aero technology and its functionality.


So my point made is a functional diffuser doesnt mildly effect a car... the best visual example I have found for that would be the arta nsx on suzuka many years ago.. rain on the ground was sent almost 100 feet in the air.

<iframe width="420" height="315" src="http://www.youtube.com/embed/8Mqoe7YNPEU" frameborder="0" allowfullscreen></iframe>

Sorry if you felt attacked by that
Click to expand...

That's a pretty cool video.

I wonder how much of the upward lift of the water was from the diffuser as oppose to the spoiler.

When I drove my NSX with my spoiler in the rain at 90MPH it felt so planted to the ground and I can see from the mirrors the liquid cock tail like that video.
 
geometro said:
Aluminum diffusers work just fine--when they are made right:

http://hellafunctional.com/?p=369

http://www.motoiq.com/magazine_arti...ck-terror-fxmds-record-setting-acura-nsx.aspx

The recipe was actually given in this post:

http://www.nsxprime.com/forum/showpost.php?p=1448519&postcount=21

I think Difflow chose the path to keep their product compatible with stock exhausts.
Click to expand...



Dood...

you are talking to someone who knows a lil more than you... I never said a diffuser could not be made of aluminum... but lets look at how you addressed the assumption

http://www.motoiq.com/magazine_arti...ck-terror-fxmds-record-setting-acura-nsx.aspx

In the above url - your looking at the old FXMD diffuser... before Abdrew Brillant joined the team.. meaning the less-funtional diffuser not on the car during there record lap at buttonwillow... Andrew is thier aero engineer - before andrew there was no aero engineer involved

http://hellafunctional.com/?p=369

The above url is FXMD's current diffuser - made of aluminum - notice no fins (what fins are for was never answered by diflo and wasent addressed in the video either... we agreed not to argue the point) insteadof fins there are 5 "boxes" on the car you are referencing

http://www.nsxprime.com/forum/showpost.php?p=1448519&postcount=21

The recepit you claim was given in the url above had a picture posted by cl65 and then addressed by Billy.... It is a the picture of the diffuser they no longer use... also made of aluminum.

you said...

I think Difflow chose the path to keep their product compatible with stock exhausts

Problem - stating the words "I think"... words often forgotten by the reader then reposted somewhere else with the words "I think" ... making data on prime so misleading
 
Ross what are you saying? That none of the aftermarket diffusers do anything at all? I think even that little puny R one was there because it does something.

Oh wait... I said "I think"... LOL
 
TURBO2GO said:
Ross what are you saying? That none of the aftermarket diffusers do anything at all? I think even that little puny R one was there because it does something.

Oh wait... I said "I think"... LOL
Click to expand...


Any of them (on the type r a rake doesn’t exist) that have a rake add a minimal decrease in drag – (fractional benefit)

None of them have functional fins – fins are there to make channels for the air under the car to aid in the smooth flow. Channels are ineffective unless 1) the underbody is flat 2) they begin in front of the rear tire and the farther forward the better. Channels are just like the rake seen on all these diffusers but at a smaller degree of incline – making the large degree rake very effective.


When talking about a production based car – the Ferrari Enzo is spoken about as the functional pioneer – as it is the most effective of any production based vehicle at or before its time…

images


These channels help minimize high pressure under the cabin in the center of the car.. production based cars dont have very effective aero when compared to race purpose built cars... for example... the 430 created a low presure channel in the center of the car before the diffuser

112_0808_30z+2008_ferrari_430_scuderia+f430_aerodynamic_comparison.jpg


thats all the time I have explaining aero... I hope people look for a better understanding of all of this.
 
I forgot to add.. The taitec is the mast effective as it eliminates the rear valence allowing more air to travel through freely
 
I'm with Ross,I have the DF piece, and it and the diflo are mostly dressup cosmetic things,minimal real world effects but look racy.
 
So then I want to know if the fractional gain in aero will make me fractionally faster or if the fractional gain in weight will make me fractionally slower because fractional gains make me fractionally happier and fractional losses make me fractionally more sad.
 

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