ok simple question. would switching the direction of the underpanel fins affect performance. like, putting the deepest part of the fins near the axle. that way its not blatantly obvious that youre running a rear diffuser. does that make sense?

 

That's the way they were designed to go....

 

really? cuz i remember someone posting a pic of his rear diffuser and the deepest part of the fins where near the back (edge of the bumper).

heres a thread that spawned this question.
https://www.evolutionm.net/forums/sh...d.php?t=173081

 

Looks to me as though that one is the wrong way around...I have mine installed the other way

 

Shiv seems to have his installed the same way as you can't see it in this pic

 

I believe this is a shot of erioshi's setup:


Maybe you guys know, will the Vishnu rear diffuser work with the standard Vishnu exhaust? It's a Helix exhaust, right?

 

That car is here in Reno now, I know the owner and on the rear difuser, every other fin is facing the opposite direction.

 

ok ...thanks for posting up the pics guys. :thumbsup: cuz i saw the guys evo that i posted and was thinkin ....ehhhhh maybe not. i know its works with vishnu signature exhaust and they said that it was designed to work with flat exhausts. think the AVO would fit it?

 

That's right I seem to remember that the center straight
is reversed on Shivs' old car

 

The "deepest" part of the fin should be in the back. reason: The airflow under the car is horizontal-parallel to the road. Due to the angle that the diffuser base is set (because it's mounted to the bumper) to keep the fins parallel to the ground, they are angled. If you install them with the larger section toward the rear, as designed, then the fins become parallel to the road. BUT, it wouldn't amke too much difference on a street car anyway so install them anyway you like.


<- Correct

<- correct


^ Correct

<- Incorrect

 

the bottom of that enzo is sick! Would suck just to change the oil though...

 

Actually, it doesn't really matter which end is out. To really figure it out you would need a wind tunnel.

Ideally, the whole vehicle works just like a wing but opposite. You want a low pressure zone of faster moving air going beneath the car. Also a high pressure zone of slower moving air going over the car.

This creates a suction effect to the ground or as most of us know it as downforce.

So, the positioning of the winglets, fins etc... doesn't matter as long as they help facilitate the low pressure effect.