has anyone ever seen these for the ef chassis? it'd be nice to have one. and i'm not talking about the cheap diffusers like the str one..."holes in the bumper". i'm talking about rear diffusers

 

hears another good question, who actually drives these really aerodynamicly poor cars that fast to reall matter. I mean at 100mph plus these things don't exactly cut through the airs easily. Get one sideways at that speed and kiss your butt goodbye. ITs my understanding they work well on cars that are stabile at those sort of speeds 100mph+ and the EF chassis is none of those. Unlike say the supra, but then who among us would not want one of those if they didn't cost so darned much.

 

Do you reply just to see yourself type?

Good lord... if the man wants a Diffuser, I say awesome. At 123mph an EF is as stable as any car I've driven.

 

I said why, aerodynamicly these things have far more severe issues than ones a diffuser is going to help. ANd I have driven several cars at 150 mph+ and let me tell you those cars were far more stabile at 150 than the EF is at 100.

 

For being mostly stock my Ef was very stable at 162 er whatever (stock tires, DX trans, 7250rpm). The key is not comparing it to other cars because stability is so...relative.

I rode an FZ1 around, and it felt less stable than my Ninja because it weighed more. The FZ1 owner rode my Ninja and said the FZ1 felt more stable because it weighed more. See, relative.

-Dustin

 

What kind of HP was you pushing to get an EF chassis that fast. I had a 1979 Chevy Monza Spyder to 155 mph but I had a 350 chevy smallblock in it and that car is far slipprier than an EF. That car ran a quarter in 12.47 and had time slip to prove it. but the 155 was on the street not at the track.

 

.29-.30 is a respectable drag coefficient as far as even current cars go.

 

i'm not looking to get this stuff for downforce...but simply to lower the Coeffiecident of drag. you dont have to travel @ 100 mph to realized the benefits of a more "slick profile" this is something you can realized @ 70 mph with the increase of mpg as you travel on the freeway.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">What kind of HP was you pushing to get an EF chassis that fast.</TD></TR></TABLE>
IDK, see my sig, it was the HB before I swapped in the A6.

Look for stuff about electric CRX's they almost always do underbody work on those. And electric motors do get hot, so the stuff they use will probably take the heat.

-Dustin

 

Well I think the topside issues contribute to the most drag, but realisticly anything you do to help will make improvements as well. However improvements are hard to quantitise unless you have access to a wind tunnel.

 

Yes but keep in mind air fron the engine bay has to get out somewhere or you cook everything. I never said it wouldn't help, just that the results VS effort would not be very promising. Without windtunnel testiing you could actually make it worse.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by virginia_dude &raquo;</TD></TR><TR><TD CLASS="quote">Yes but keep in mind air fron the engine bay has to get out somewhere or you cook everything. I never said it wouldn't help, just that the results VS effort would not be very promising. Without windtunnel testiing you could actually make it worse.</TD></TR></TABLE>
Acctually no, knowing the basics of aerodynamics, you can apply some of the standards of the air evacuation and redirection.
a diffuser, front splitter and a good rear wing can dramatically improve car's DC.
Stan

 

I do understan what you are saying but who here has that experience and has access to a wind tunnel to measure results. without that you can easily make things worse instead of better.

 

i dont think adding a rear underbody tray could have ANY negative effects. its not like the underbody tray has to conform to any specific shape, all its there to do is to provide a flat surface underneath the car. look @ f1 cars for example, there's no trick to their underside, its simply flat. look @ underneath the skyline or nsx...again, no tricks really...just flat

 

Ever look at F-1 and iny cars, you would be surprised the degree of engineering that goes into that. Ture, it means les on the EF but on an Indy car it means Everything. there could be negative aspects, or it can have positive ones, but would you really want to find out at 120+ if it was a negative. I mean more power to you if you want to try, just be aware soemthings don't react as you expect them to.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by virginia_dude &raquo;</TD></TR><TR><TD CLASS="quote">Ever look at F-1 and iny cars, you would be surprised the degree of engineering that goes into that. Ture, it means les on the EF but on an Indy car it means Everything. there could be negative aspects, or it can have positive ones, but would you really want to find out at 120+ if it was a negative. I mean more power to you if you want to try, just be aware soemthings don't react as you expect them to.</TD></TR></TABLE>

a rear diffuser is not just a simple flat panel, yes a flat panel will do what a true diffuser does, to a degree, in order to utilize Bernoulli effect you have to expand and direct outgoing air. but like i said earlier, adding even a simple panel will do wonders, especially if used in conjunction with a front splitter. it all has to do with accelerating air under the car and expanding it right after it, creating negative lift, in effect using the entire car as a inverted wing.
a picture of a F1 diffuser

stan

 

here is a really nice reading on this all
http://www.f1nutter.co.uk/tech/aero.php
cheers
stan

 

well...i know that the rear diffuser isn't just a flat panel, thats a lil obvious. but flat panel under the car, to over to exhaust and openings under the car in conjunction w/ some tire strakes should work well.

gotta love the enzo

 

When you make one let me know...I will buy

 

incidently, one body kit that has good potential for aero development is the WW kit.
stan

 

You folks might wanna check out Doug (Hondata) and his old old CRX that went 240 kph in New Zealand.

He had problems with the fuel in the tank getting hot from the exhaust.

http://asia.vtec.net/country/e....html