Has anyone removed those lower front air diffusers after lowering? As of right now I'm sometimes scraping and I'm not lowered. Just wondering what effects it would have if those pieces were removed.

 

Just so ya know, that's not called an air diffuser...usually called a front air dam, just so ya know:~) It wont have any effect if you remove it.

 

ah thx for the correction. Why don't I see more people taking those off if they scrap so much? I might have to do that to my JCW kit if I lower this bad boy.

 

IIRC, it's just held on with a bunch of pop-its.

The purpose of it is the create a low pressure zone under the car to help with high speed stability and grip. Personally, I wouldn't worry about removing it if you do a lot of stop and go driving. I would leave it on if you do a lot of road race or even highway driving.

 

it also serves somewhat as a underbody protector as well... so i wouldn't... its a cheap piece of plastic and the dealer have replacements... scraping it does literally nothing because its designed to take that abuse... i'd just be a bit mor careful at steep inclines

 

Are you talking about the airdam or the undertray?

 

But it is designed for a idiot to drop a ladder off this truck and you running over it! mad:

 

im assuming he's talking about the airdam...

and yea... its suppose to protect the engine if an idiot drops a bunch of ladders in front of ya

 

from my experience that thing does NOT protect the engine whatsoever. not the steering rack, not the transmission, not the power steering, not the oil pan, in fact, all it seems to do is act as an air dam.

 

I think he just forgot to add the

 

It`s called Pressure Lip on realoem.com.I cut it in to half horizantally after lowering.

 

I'm just going to let my grind away. If it gets too raggedy I'll pop on a new one. Repeat.

For that matter, we'll probably stock them...

--Dan
Mach V
FastMINI.net

 

No real reason to remove em unless they become unsightly. Hard to argue with the OEM wind tunnel testing. However, for any of us to know for sure, we need to wind tunnell test each of our cars with the springs in place to see how things are affected. :-)

Good luck and enjoy the ride!

 

I replied to a similar thread a while back. These are functional as are all of the other under carriage flaps etc. The front two are quite important and do contribute to high speed stability.

I've had many discussions with a fellow with inside knowledge...he currently works as an Aero engineer on the Williams F1 car. He was quite pointed about the need for these seemingly useless tabs of plastic.

 

I've got the JCW Aero kit and as you'd predict when you scrape the two individual lips, they eventually jetison themselves. I removed my second one when I realized the first had done so itself, possibly at speed. I haven't lowered my car yet. Waiting for H&R's on backorder.

I haven't noticed any problems at extra posted speeds when they are absent, nor any difference, though admittedly, the subtle difference they'd likely make are not likely to be felt until you need them.