interesting thread. since i lost my front under tray to the snow and ice this winter i have debated trying to make a carbon/kevlar one with an integreated lip, mostly for fun, but doing it properly so it is functional and making it fit will be the tricky part.

 

No...

the vendor never shipped it... there was a big thread on here with me going back and forth with the vendor...but it was deleted by Evom... since it seemed like I was bashing the vendor... I guess I bashed him since I designed it, paid him and still havent received it, but he has his car and other cars running it.

 

the one thing people tend to ignore is that the factory front undertray has brake ducts that direct a lot of air towards the rotors... I've yet to see an aftermarket solution that includes these. I guess if you ran aftermarket ducts like the AMS kit then it wouldn't matter, but without that I would expect increased brake heat, fade, and wear.

 

yeah... directs that air right into the brake dust shields... who cares

 

and what about an under tray for the front what is everyones consensus

 

it's a lot more functional then you would suspect...

 

Just trim the shields back. You can still retain the clip for the abs line and leave enough to tuck the abs line down so that it will still be shielded from the rotor heat.

 

I took off my brake dust shields... helped a LOT with brake cooling.

Most track-only cars do this.

 

yeah but as long as we're going to keep stock stuff for not great reasons you're not allowed to take the brake dust shields off.

why don't we try getting a real undertray that makes significant pounds of downforce at almost all speeds and then get real brake ducts that don't just cool the inside of the two piece rotor you spent so much money on.

 

I have read that 9.5 deg. is the optimum slope angle for the rear diffuser but it varies depending on the car. I am in the process of making my own undertray and diffuser and am choosing the optimum material to make them out of. I was thinking some medium-thin gadgue aluminum but if anyone knows a good plastic type/thickness to use I would love suggestions.

 

I used some 3/16" HDPE on my PPIHC car. Stiff/tough enough to deal with the rock spray, but probably overkill for a street/track application due to the weight. If you're in Denver, check with the guys at Plasticare to see if they've got any lighter weight suggestions.

Dave

 

I've been working on this stuff as well.

https://www.evolutionm.net/forums/sh...d.php?t=358536

 

The Beatrush front undertray has similar provisions as the stocker.

l8r)

 

I just finished making an undertray for my VIII out of 1/8'' ABS which goes all the way back to the cat. PM me if you are interested in one as I just started selling them. If you are around the bay area you can come to my shop near Palo Alto and I can throw your car up on my lift and install it in about 30 min.
https://www.evolutionm.net/forums/sh...d.php?t=361975

 

I have an Evo 9 MR. I just had the car tuned and modded, and the shop gave it back to me without the undertray. I notice now that the engine oil temp stays at around 60C (140F), which is about 18F lower than it used to be. When I get moving fast, it plummets down to 50C (122F). I kind of like this, and I am very sure this is happening because of the improved airflow due to the missing undertray. I think a lower oil temp will result in improved engine life. The only drawback is now the car is less aerodynamic. What does everyone think, should I try to get a replacement undertray, or just leave it the way it is? I don't really go that fast, staying mostly with 5 over the speed limit, but I plan to track the car someday when I find the time.