OK, ?? Does the fujimura and Evo Rear Diffuser actually work??

Soon · 07-22-2010, 07:40 PM

im not the smartest man

but ive been doing research on how rear diffusers actually create downforce
and it seems to me that the diffusers offered for our vehicles are purely cosmetic

based on what i read

the diffuser creates negative pressure in the rear of the car because the volume of air coming into the diffuser is bigger than the volume entering the the front of vehicle
"This negative pressure accelerates the air under the car which puts the whole underside of the car under negative air pressure. This creates a vacuum effect under the car which sucks it into the ground and creates down force".

now the problem i seem to have is
1) in order to achieve this negative pressure the car has to be as low to the ground as possible

2) seems to me that functional diffusers actually start at the front of the rear tire

now correct if im wrong but the carbon diffuser we bolt on to the z34 jus dont seem functional

which makes me sad cuz i really wanted one
but im really opposed to cosmetic features which serve no purpose.

the air has to start hitting the diffuser from practically mid vehicle

now lotus seems to be the actual inventor of the rear diffuser and it appears this is how it functions to produce that 30% extra downforce capable by such

now if anyone can prove me wrong by all means do so
id love to have an excuse to buy this thing

Cmike2780 · 07-22-2010, 07:49 PM

Unless your doing high speed runs, you won't really utilize enough downforce to effect handling. The diffuser from evo r is functional, just not as efficient as an f1 diffuser. The diffuser may not go midway, but notice that all the components are relatively flush. Even the exhaust has aerodynamic significance.

m4a1mustang · 07-22-2010, 07:52 PM

Mike... it's not functional. Not in the least. It's just for looks.

SoCal 370Z · 07-22-2010, 07:58 PM

It's cosmetic because you would have to redesign the exhaust routing and cans to keep a true underbelly rear diffuser from lighting-up!

Soon · 07-22-2010, 07:58 PM

Quote:

Originally Posted by Cmike2780

Unless your doing high speed runs, you won't really utilize enough downforce to effect handling. The diffuser from evo r is functional, just not as efficient as an f1 diffuser. The diffuser may not go midway, but notice that all the components are relatively flush. Even the exhaust has aerodynamic significance.

Now im gonna have to respectfully disagree kind sir

it seems to me the rear of the 370z under carriage is pocketed

logic seems to dictate this "pocket" above the muffler would trap air actually creating drag

which further proves the point that an actual Diffuser would have to start closer to the center of the Z...no?

m4a1mustang · 07-22-2010, 08:00 PM

Quote:

Originally Posted by Soon

Now im gonna have to respectfully disagree kind sir

it seems to me the rear of the 370z under carriage is pocketed

logic seems to dictate this "pocket" above the muffler would trap air actually creating drag

which further proves the point that an actual Diffuser would have to start closer to the center of the Z...no?

You're right... the diffuser would have to run up to right around at least the rear axle area.

EVO-R/Fujimora "diffusers" are just designed to look purdy.

Though Mike was right in that you really need to be doing some pretty high speed track stuff for a functional diffuser to do you any good.

Soon · 07-22-2010, 08:03 PM

Quote:

Originally Posted by SoCal 370Z

It's cosmetic because you would have to redesign the exhaust routing and cans to keep a true underbelly rear diffuser from lighting-up!

sooooo yes \i assume without rerouting the muffler canisters or creating a diffuser that atleast goes to the end of the Mid pipe

this bolt on is for looks only.....which kinda spells...R.I.C.E

awwman that sucks

m4a1mustang · 07-22-2010, 08:04 PM

Quote:

Originally Posted by Soon

sooooo yes \i assume without rerouting the muffler canisters or creating a diffuser that atleast goes to the end of the Mid pipe

this bolt on is for looks only.....which kinda spells...R.I.C.E

awwman that sucks

You're calling rice? Where's kenchan when I need him...

:bowr ofl:

kenchan · 07-22-2010, 08:09 PM

Soon- you are the man of rice bodykits and you didn't know this was for cosmetics???

Come on now...

Soon · 07-22-2010, 08:16 PM

Quote:

Originally Posted by m4a1mustang

You're calling rice? Where's kenchan when I need him...

:bowr ofl:

lol

im sorry man, im never opposed to what ever floats someone elses boat

i jus believe sport cars should have features which actually accentuate and increase performance aspects

look at Porsche for example

911 base...

911 gt3...

yes there are significant cosmetic differences but each one on the gt3 serves a purpose
to make the car more KICK A$$ performance wise implementing physics and science to increase it

i think any sports car should addition should obide by the same rules

because to add useless features to car built for performance is simply....
RICE

Soon · 07-22-2010, 08:18 PM

Quote:

Originally Posted by kenchan

Soon- you are the man of rice bodykits and you didn't know this was for cosmetics???

Come on now...

bout time you showed up

my threads are never the same without you...

Snakebite202 · 07-22-2010, 08:41 PM

So bodykits and wheels are a no no then?

Soon · 07-22-2010, 08:44 PM

Quote:

Originally Posted by Snakebite202

So bodykits and wheels are a no no then?

not at all,well maybe on caviler yeah, i mean seriously,

but hey look at the GT3 i posted, technically thats a body kit
...which improves handling, from inductions to wings that actually create downforce..

wheels can be wider and forged to maintain light weight..etc etc but yeah throwing some steel casted, chrome dipped rims on a true sports car...uhhh no

RCZ · 07-22-2010, 09:18 PM

lol @ OP's question about the diffuser. How do you do research, find out how it works and then still wonder if that "diffuser" actually does anything...

m4a1mustang · 07-22-2010, 09:22 PM

Quote:

Originally Posted by RCZ

lol @ OP's question about the diffuser. How do you do research, find out how it works and then still wonder if that "diffuser" actually does anything...

07-22-2010, 07:40 PM	#1 (permalink)
Soon Base Member Join Date: Mar 2010 Location: Rockland NY Posts: 240 Drives: 2008 Cherokee SRT8 Rep Power: 16	OK, ?? Does the fujimura and Evo Rear Diffuser actually work?? im not the smartest man but ive been doing research on how rear diffusers actually create downforce and it seems to me that the diffusers offered for our vehicles are purely cosmetic based on what i read the diffuser creates negative pressure in the rear of the car because the volume of air coming into the diffuser is bigger than the volume entering the the front of vehicle "This negative pressure accelerates the air under the car which puts the whole underside of the car under negative air pressure. This creates a vacuum effect under the car which sucks it into the ground and creates down force". now the problem i seem to have is 1) in order to achieve this negative pressure the car has to be as low to the ground as possible 2) seems to me that functional diffusers actually start at the front of the rear tire now correct if im wrong but the carbon diffuser we bolt on to the z34 jus dont seem functional which makes me sad cuz i really wanted one but im really opposed to cosmetic features which serve no purpose. the air has to start hitting the diffuser from practically mid vehicle now lotus seems to be the actual inventor of the rear diffuser and it appears this is how it functions to produce that 30% extra downforce capable by such now if anyone can prove me wrong by all means do so id love to have an excuse to buy this thing __________________ 2009 blk 370z=SOLD Now drives... SRT!!

07-22-2010, 07:49 PM	#2 (permalink)
Cmike2780 A True Z Fanatic Join Date: Jun 2010 Location: Long Island Posts: 5,059 Drives: slowwww Rep Power: 29	Unless your doing high speed runs, you won't really utilize enough downforce to effect handling. The diffuser from evo r is functional, just not as efficient as an f1 diffuser. The diffuser may not go midway, but notice that all the components are relatively flush. Even the exhaust has aerodynamic significance. __________________ [09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R] [ArchitTEK Photography]

07-22-2010, 07:52 PM	#3 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6963	Mike... it's not functional. Not in the least. It's just for looks. UNKNOWN_370 likes this. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-22-2010, 07:58 PM	#4 (permalink)
SoCal 370Z A True Z Fanatic Join Date: Feb 2009 Location: US of A Posts: 2,842 Drives: Answers Rep Power: 34	It's cosmetic because you would have to redesign the exhaust routing and cans to keep a true underbelly rear diffuser from lighting-up! __________________ ( Click to show/hide ) Why I NEVER say NO to the Panda Lou Fusz!!!

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07-22-2010, 08:09 PM	#9 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	Soon- you are the man of rice bodykits and you didn't know this was for cosmetics??? Come on now...

07-22-2010, 08:41 PM	#12 (permalink)
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07-22-2010, 09:18 PM	#14 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	lol @ OP's question about the diffuser. How do you do research, find out how it works and then still wonder if that "diffuser" actually does anything...