Best bang for the buck (as in actually works but you get to keep both kidneys)
APR Performance it's where I got mine.

For the fender mod, think of it like M3 fenders... ricey on the honda varients too ;)

But they serve to vent the air from that area when you are fender liner less.

i just want the big mouth on that blue car for mine. That would ease all my stress.

The fender mod directs the air that the wheels blow around around the car instead of into a flat wall.

The fender vents in a Z3 and the portholes in older Buicks are for heat extraction.

I do my own homework. An answer like that shows you probably haven't really done yours.

http://i2.photobucket.com/albums/y11...tGotServed.jpg

I figured it's a tow hook, but my god, that thing looks fucking retarded and probably scrapes everywhere, even on takeoff on a flat surface. It just looks stupid and out of place. I am all for tow hooks if needed, believe, I used mine a time or two, lol, but that shit is just JDMfugly!!!

Which model do you have, and how tall is it? Did you have to fab something up to make it taller than what they offer?

AS-105502 GT-II (Aluminum)

Mine is 16" tall the GT-I is 13" and the GT is 10" I didn't do anything to make it taller. I have to stay withing the SCCA SM2 rule set which limits the wing height to 6" above the windshield header. Ideally a little bit higher might be better. There are a couple of models depending on what you are wanting to do with the car.

Some autocrossers are replacing the upper element which is 5.5" with a 7.5" one. It is still within the rules, but I personally think the 5.5" is enough.

To each his own, that's what makes it fun.

You are going to have to do alot more than that to bait me into a lame e-fight.

Go look at aero models of underbody diffuser systems vs just opening up the bumper and using normal bodywork as the "aero". They do similar yet different things. For the money/ease... I'm content with opening up my bumper.

It doesn't have to be a lame e-fight. I just asked if you had any data. You could have just said "no, but it looks cool", or "yea it was good for about 2 tenths at the drag strip".

come on, we're diy miata builders. we dont "take data". we go research shit online and generate our own theories based on what we saw and read. there is no data unless someone else* has done the work. and someone else* is often race teams that don't share data.

occasionally someone with toss a magnehelic gauge somewhere (eg hood vents) and get some data, but I think there's like two guys who own miatas that have ever done that.

* "someone else" is my favorite helper.

i have one in my trunk.....still have yet to use it. needs more cutting of my hood and attaching of my splitter.

You don't even need a magnehelic guage, a stop watch works.



Actual testing and modification based on the results is what seperates real aero from the bullshit JDM clubroadster aero.

I think for Dave's build, it wouldn't tell you much. have you heard the saying "change one thing at a time"? :)

Pffftt. Where is the fun in that. I like to build entire cars in one swoop ;p

fine fine. in that case, for one lap / session, cover up the holes?

Heh, I'd need to cover them and figure a way to add the bottom back into the bumper.

I'll provide one simple data point. On a few drag cars I know of... hole chopping of the bumper was worth a couple MPH trap improvement. I'll take it.

3 mpg out of an air dam and a bumper cut speaks enough for me. No other changes. They basically perform the same funtion as the holes. The air dam tries to keep air from getting back there in the first place. The wide cut out lets it out easier.

(Yea, the air dam keeps air out of the "dirty" underside as well and I never did test them seperatly)

--Alex

http://honda-tech.com/zerothread?id=2285480
Attachment 212335