does any one know where i could buy a rear underbody diffuser for my ef9

 

Just so you know, I doubt there would be ANY difference in performance. Sounds rather hard-parkish to be honest.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CivicWagonRUS &raquo;</TD></TR><TR><TD CLASS="quote">Just so you know, I doubt there would be ANY difference in performance. Sounds rather hard-parkish to be honest.</TD></TR></TABLE> Pretty much, you'll have to have some real areo work done to the front and rear before you worry about the underbody.

But in the wierd case you really need it, there are a lot of things you can do like re shaping and or moving the gas tank, tucking the exhaust, measuring the under body pressure and shaping a plate for it.

One of my friends does speed runs *200+ cert vette* he's given me a few tips if you really need it.

What are you doing for it, to be needed? You'll problly be wasting money.

 

pics of said ef9 first.

 

I wouldn't worry to much about it concidering the rest of the car isn't that aerodynamic.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludesrv &raquo;</TD></TR><TR><TD CLASS="quote">I wouldn't worry to much about it concidering the rest of the car isn't that aerodynamic.</TD></TR></TABLE>

QFT. Its like putting canards on a brick. It'll help, but not noticably.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludesrv &raquo;</TD></TR><TR><TD CLASS="quote">I wouldn't worry to much about it concidering the rest of the car isn't that aerodynamic.</TD></TR></TABLE>

My ef5 has a CD of 0.38 ... Thats awful! lol. The wagon was surprisingly aerodynamic though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ~sp33~ &raquo;</TD></TR><TR><TD CLASS="quote">

My ef5 has a CD of 0.38 ... Thats awful! lol. The wagon was surprisingly aerodynamic though.</TD></TR></TABLE> Honestly CD is just like rating peak horse power and or HP/liter.

Ricer math that leaves a ton of information out. CD sounds good but doesn't really mean much when you compare it to other things.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ***$nyper &raquo;</TD></TR><TR><TD CLASS="quote"> Honestly CD is just like rating peak horse power and or HP/liter.

Ricer math that leaves a ton of information out. CD sounds good but doesn't really mean much when you compare it to other things.</TD></TR></TABLE>

What other things are we comparing it to in order for it not to mean much?

I understand power, traction, and weight might just eclipse the importance of CD, but it is sort of an important part of the "whole package" way of doing things.

But, the way you said it seemed to insinuate that there was more to airflow in/around the car than just CD. Care to explain?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AMkrew_1 &raquo;</TD></TR><TR><TD CLASS="quote">

What other things are we comparing it to in order for it not to mean much?

I understand power, traction, and weight might just eclipse the importance of CD, but it is sort of an important part of the "whole package" way of doing things.

But, the way you said it seemed to insinuate that there was more to airflow in/around the car than just CD. Care to explain?</TD></TR></TABLE> I'm more then happy too.

Best place to start is : http://en.wikipedia.org/wiki/Drag_coefficient

They have a link about drag area vs CD and some typing on areodnymics on cars.

CD and drag is just one number and doesn't factor things like tuning of areodnymics. in overly broad ways I can honestly say a crx is more areodnymic then an f-1 car.

Aerodnyimcs have a lot more to them then just a C/D.

If you ask me about power of areo, just look at that linky, you can see how exponetially it takes more power to go faster on the same aero. So would adding a wing or having a functional lip be easier then adding 500 more HP? Granted that's a bit of an extreme but see what I'm saying?

 

im going to be doin a time attack championship here in ireland here is the civic

im also going to hopefully putting one on the front also,
there is a tunning company over here that bought a crx ef8 from j's racing in japan i got a look at the under side of the car its cover in underbody diffusers front and back they said it help lots with getting as much down force from a car that has very little

 

Then you answered your own question......Talk to someone at J's Racing.

 

I think what you might be thinking of it a front Splitter and rear diffuser... rather than a full underbody. A front Splitter would be about the only thing to make a decent difference for the amount of money and research required to make the project actually worth it.
Check out these links:
http://www.specialprojectsms.c...ID=30

http://homepage.mac.com/planet....html

and this thread in the road race/auto-x forum:
https://honda-tech.com/zerothread/2149918

 

j's racing dont make them it looks like a custom job
was lookin to get some thing like this and modify it to fit the civic
or make up something like this guy did

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ***$nyper &raquo;</TD></TR><TR><TD CLASS="quote"> Honestly CD is just like rating peak horse power and or HP/liter.

Ricer math that leaves a ton of information out. CD sounds good but doesn't really mean much when you compare it to other things.</TD></TR></TABLE>

I dont think a 20 year old civic is going to be tuned for downforce or other CD factors that would stop the car from going fast and instead providing more vertical weight. Most production cars are designed to have the lowest CD rating possible to reduce drag and increase fuel economy, which is often much more useful then gaining 10kph around a tight corner at topspeed.

 

this is the crx i was talking about

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ~sp33~ &raquo;</TD></TR><TR><TD CLASS="quote">

I dont think a 20 year old civic is going to be tuned for downforce or other CD factors that would stop the car from going fast and instead providing more vertical weight. Most production cars are designed to have the lowest CD rating possible to reduce drag and increase fuel economy, which is often much more useful then gaining 10kph around a tight corner at topspeed.</TD></TR></TABLE> ugh.

The fact it's more complex then JUST a cd # is what some are missing.

downforce is needed even at lower and highway speeds also corners are cut for the fact a cheap civic isn't going to have as much wind tunnel time as a sports car.

It cuts the wind ok zipping down the highway, but it's far from a areodynamic car.

Having a low CD or high doesn't lay out the whole picture. Hence using it as a way to measure a car is silly, as the link i put up states its not even used anymore.... just even more stating all i'm trying to say.

A good CD is a moot point anyway you slice it.

 

maybe you should race it at the track now and figure out what you really need for downforce and suspension. maybe a simple wing spoiler would help you out. maybe nothing at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mystic-s &raquo;</TD></TR><TR><TD CLASS="quote">this is the crx i was talking about



</TD></TR></TABLE>

Not to change the subject but does anybody know the EXACT suspension this CRX has? I'm assuming j's racing(obviosly) but i'd like to know where to find them if possible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ef8powr91 &raquo;</TD></TR><TR><TD CLASS="quote">

Not to change the subject but does anybody know the EXACT suspension this CRX has? I'm assuming j's racing(obviosly) but i'd like to know where to find them if possible. </TD></TR></TABLE>

http://www.aj-racing.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ***$nyper &raquo;</TD></TR><TR><TD CLASS="quote"> ugh.

The fact it's more complex then JUST a cd # is what some are missing.

downforce is needed even at lower and highway speeds also corners are cut for the fact a cheap civic isn't going to have as much wind tunnel time as a sports car.

It cuts the wind ok zipping down the highway, but it's far from a areodynamic car.

Having a low CD or high doesn't lay out the whole picture. Hence using it as a way to measure a car is silly, as the link i put up states its not even used anymore.... just even more stating all i'm trying to say.

A good CD is a moot point anyway you slice it.</TD></TR></TABLE>

Fair point, although i think it can still be used as a comparative figure between two cars designed for the same intention (daily driving, track use).

 

the company that now own it are called tuning factory there in dublin in ireland
there site is http://www.tuningfactory.com think they have a list of parts on it

 

Link doesn't work. I was more interested in the fender flares that are on the CRX :]

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Legend of Street &raquo;</TD></TR><TR><TD CLASS="quote">Link doesn't work. I was more interested in the fender flares that are on the CRX :]</TD></TR></TABLE>


you do realize, besides the fender flares, that the front fenders sit about 3 inches fatter than stock

 

http://www.tuningfactory.ie sorry here it is