Yea so I'm trying to find a Rear Diffuser like the RE-Amemiya one for the fd's, i think they have ones for FCs too but the RE-A one is like $800+ for the fc, so thats a no no, already spent $1200 on the damn bumper.



so are there any diffuser alternatives? or am i stuck without one?



kevin.

as far as i know the re is the only one. i have serched and serched but only come up with the re. shoot im stuck making my own frount splittercause i want to keep the stock bumper.

a splitter or a lip? there are universal splitters that mount with those turnbuckle things, which ive been considering getting, and of course the side splitters which go on the sides of the front bumper, and sideskirt splitters.



im thinking about smoothing the entire bottom of my t2, thats why im interested https://www.nopistons.com/forums/pub...IR#>/smile.png.



kevin.

im talkin bout a full function splitter, with intergraded belly pan and break ducks, its hard to explain but it will mount to the frame and be made out of cf with a ck bottom. i have it drawn up , its just goin to take some time to make.

Teknics, $1200 for an original RE or for the Rotary Extreme one?? That sounds cheap for the original.



I went w/ the CF RE rear diffuser...$920 at the door...it's worth it considering I've never seen an authentic one around here..or any authentic RE parts that is unless it's on an FD.



The other option is to make your own, or their may be a universal one that could be trimmed to fit our cars..

i wonder if the FD re amemiya pro diffuser would fit, they look a like on fc and fd

martin: i think the undercarriage is a lot more different tho, we got that hump thing from the spare tire and bla bla bla.



one320b: got some links to some good pics of your rear diffuser? My front bumper (seen in my sig) is the rotary extreme one, after shipping and everything it was like $1250, not bad but ive also put about $15k+ into other areas of the car already....and its still pretty far from done...so another $1k on a rear diffuser isnt what im planning on spending money on.



fc3sboy: yea thats the same kind of front splitter ive been looking into, a full bellypan etc...i have ducts for my brakes on my bumper that im going to run ducting directly from to the brakes. I'm also considering the side splitters, under the sideskirts, to smooth out that whole area of the car. I have to get the whole thing together before doing this tho https://www.nopistons.com/forums/pub...IR#>/smile.png.



oh and, for everyones knowledge, if i can get my n/a registered soon (title problems) im switching jobs, working for the newark port authority and will effectively triple my income...aka i would definitely buy the real RE rear diffuser, and id probably finish the car before january.



The way its looking right now tho ill probably finish the car with what i have, drive it next summer, then next winter take it down and do coil-overs, interior, and possibly that diffuser, and probably a nice wheel change too. then the car will be finished completely https://www.nopistons.com/forums/pub...IR#>/smile.png, if i do all that at once itll just take too long to finish...properly. i could ghetto hack it together but i dont want to do that.



kevin.

I'm not up to speed on body kits - when you say diffuser do you actually mean a real diffuser with the whole flat undercarriage and airflow, or is it a rear bumper that just looks like it?



Mark

na, im into function over form, im speaking the real deal diffuser, smoothed undercarriage etc.



Want to get one to use in conjunction with a real front splitter with full bellypan, as well as side splitters udner the side skirts to smooth out the area under the cockpit.



kevin.

Cool! I can't imagine there being a much easier option than to do it yourself with some aluminium sheet. It sounds kind of tricky because you have to worry about cutting off some of the airflow for the rad and exhaust.



Mark

you should contact chuck... its 900 on his site, and since you're already his costumer, he'll probably hook you up, and we can get our diffusers shipped together so we can save some money on shippping (im getting the re pro diffuser)



http://www.rotaryextreme.com/reamemiyafc.html

thats so sick



i like the idea

Yea my friend has the stock s4 t2 belly pan so i was gonna use that as a basis for the front splitter.



the onyl problem with completely smooth bottoms is if enough airflow gets under there you go airborne, so i think it needsd vents cut into it as well underneath so i dont pull a racingbeat somersault https://www.nopistons.com/forums/pub...IR#>/smile.png.



I really wanna see that RE diffuser on an FC, can someone try to find me a pic? im way too busy lately https://www.nopistons.com/forums/pub...IR#>/smile.png.



oh and the FG one from chuck is only $750 so if he can hook me up thatd be awesome, id just get it painted flat black https://www.nopistons.com/forums/pub...IR#>/smile.png.



kevin.

I am getting my car back from the paint guy this weekend... I'll try to snap some pics..but the diffuser isn't installed yet as I have a LOT more body stuff to get first!



I'm sure everybody has seen these pics, but if not:



http://www.re-amemiya.co.jp/commodit...bb4ce&scd=6006

these are the pics One320B was talking about since his link seems to not work or something.



http://www.re-amemiya.co.jp/commodit...ffuser_pro.jpg



never saw those pics before, that looks like what im trying to get, maybe ill have to pony up the cash and just get the RE one.



kevin.

I like Pie!

That's not a working diffuser though.



Mark

Why do you say that?



kevin.

Because a diffuser is useless unless air is being forced over it - that car hasn't even got a flat undercarriage.



Mark

the only problem i see with a completely flat underside is the independent suspension. I mean you can put anything under the diff or axles.



Plus thats only the Rear diffuser, it's easier to buy that one, then im going to make the front splitter with bellypan and the side splitters.



all 3 working together will make a pretty flat undercarriage.



kevin.

It's less to do with having it flat than to do with having good airflow, in fact with a completely flat undercarriage a diffuser would be useless since all the air would escape out the sides. What you want is for as much air as possible under there to be channeled out at the back over the diffuser which cuts the lift.



For less than the price of that diffuser you could buy a few 1mm aluminium sheets, and with a little planning make your own - diffuser and all. The only things you need to worry about is air paths for the radiator/diff/exhaust - which is not hard to get right. There's a good book on all this I can dig up if you want.



Mark

So youre saying that that diffuser is useless? but can you say why you think its useless? Like why do you think no air will go over it?



im just trying to understand so i can tell the difference https://www.nopistons.com/forums/pub...IR#>/smile.png



kevin.

On a non-ground effects car, invariably underneath you have high pressure - which creates lift = bad. On a ground effects car with a flat undercarriage and actual air passages, the whole car acts like a wing, the under carriage is made to effectively duct all the air out the back over the diffuser and turning the area of high pressure into low pressure i.e. sucking the car to the ground. Emphasis on the word "duct" - like I said, a perfectly flat undercarriage alone (i.e. without lips to hold the air in) will allow all the air to spill out the sides of the car, and away from the diffuser. So you can then safely assume the diffuser pictured is not doing anything since it doesn't even have a flat undercarriage, it has no hope whatsoever of having any serious air flowing over it.



That's a rough synopsis which is all I can offer, I don't want to get in over my head here https://www.nopistons.com/forums/pub...IR#>/smile.png. I got this book out of the library, and it seemed really good, I'd reccommend it: http://www.amazon.com/exec/obidos/tg/detai...=glance&s=books



Mark

I understand what youre saying better now, good description. So rather then perfectly flat you want air to be able to flow over the diffuser, but you want to make that air go from the front, straight to the back, you dont want it just spilling all over the place. right?



still might get this diffuser and build a full body one onto it, hopefully with the help of that book https://www.nopistons.com/forums/pub...IR#>/smile.png.



kevin.

On a side note, I noticed that Mazda paid more attention to airflow on the undercarriage of the FD. Everything is flat under there!

racingbeat made the bottom of their fc flat..... and it took off like an airplane https://www.nopistons.com/forums/pub...IR#>/smile.png.



kevin.

Yeah I don't remember a whole lot to be honest, that was when I was looking at other projects before I started the current one - almost 2 years ago.



I still think the diffuser is the easy part, make it out of the aluminium which would give you that real race car look - the only thing to remember IIRC is not to exceed 17 degrees.



Mark