Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

Is a rear diffuser a good idea?

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Old Mar 8, 2007 | 08:48 AM
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Default Is this really a good idea?

Personally I think this would be very awesome to have and really help out the looks of my accord. I also do pretty much all highway miles, so maybe would this help out with the aerodynamics?? I really dont quite know. What do you think?

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Old Mar 8, 2007 | 09:06 AM
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I'm sorry but why would you need a s2k/ferrari/whatever diffuser like that on your accord?

waste of money you will see no gains great enough to offset the cost
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Old Mar 8, 2007 | 09:12 AM
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Default Re: Is this really a good idea? (93Accord117)

I just threw up a little in my mouth....if you're going to get the diffuser you must also install the widebody kit.
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Old Mar 8, 2007 | 10:19 AM
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On our cars, our rear bumpers are pretty much parachutes. Almost any rear diffuser will help the flow of air under the car. However, that one is ugly, and I dont feel it would look good on cb7 accord. Now if you fabbed up your own one and made it nice and subtle, it might look decent.
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Old Mar 8, 2007 | 10:20 AM
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Default Re: (TheMuffinMan)

there is a thread in the hybrid forum, this guy has been building a mid engine H22 integra (2+ years is how long the thread has been up). Very nice build. Anyways, one of his latest prjects in his build has been working on a diffuser setup from the front to the rear. He hasn't posted back yet on if it's helped MPG or not yet.

But if you want to check it out anyway...
https://honda-tech.com/zerothread?id=981613&page=1

**pictures of the diffuser setup is on page 126**
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Old Mar 8, 2007 | 10:28 AM
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Default Re: (TouringAccord)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TouringAccord &raquo;</TD></TR><TR><TD CLASS="quote">there is a thread in the hybrid forum, this guy has been building a mid engine H22 integra (2+ years is how long the thread has been up). Very nice build. Anyways, one of his latest prjects in his build has been working on a diffuser setup from the front to the rear. He hasn't posted back yet on if it's helped MPG or not yet.

But if you want to check it out anyway...
https://honda-tech.com/zerothread?id=981613&page=1

**pictures of the diffuser setup is on page 126**</TD></TR></TABLE>
Thats actually what came to mind when I recommended the subtle fabbed up one. I've been watching that build for a few years now, I love it.
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Old Mar 8, 2007 | 12:56 PM
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Definitely not saying it wouldn't help, but the money spent on fabbing it for your car or having one custom made won't outweigh what it does - just cut holes in your bumper haha (i'm checking out that hybrid now btw)
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Old Mar 8, 2007 | 04:22 PM
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Default Re: (TheMuffinMan)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheMuffinMan &raquo;</TD></TR><TR><TD CLASS="quote">(i'm checking out that hybrid now btw)</TD></TR></TABLE>

you'll be reading for a while. I've been watching that thread since a few days after it was posted I believe
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Old Mar 8, 2007 | 04:45 PM
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Default Re: Is this really a good idea? (accord2021)

yea im really not trying to make my car look like a ricer or anything. The lotus Elise standard diffuser is really awesome looking and is like $80, so that may be a good idea. I just want a way to clean up that huge gap between the end of the car and the bumper. But my friend also has a welder, so we were thinking about getting some sheet aluminum and making something fancy. But too bad im getting flamed for this idea; it wasn't really my intent.
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Old Mar 8, 2007 | 04:48 PM
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welding anything down there (especially aluminum) is a bad idea, what are you going to do when you get an oil change? or need to swap out parts?

more headaches than it's worth, and the elise for like an oil change is 150 or so because that have to undo that panel on the bottom
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Old Mar 8, 2007 | 04:55 PM
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Default Re: (TheMuffinMan)

I was talking about welding the virtical channels on the diffuser, not the diffuser to the car. And this is made for the back of it, not the front so im not crazy concerned about the oil change aspect. I think I will make my own out of plastic, lighter and cheaper, same affect.
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Old Mar 8, 2007 | 04:57 PM
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i say cut the holes in your bumper, takes two seconds
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Old Mar 8, 2007 | 05:06 PM
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Default Re: (TheMuffinMan)

I dont want my car to look like a dumpster
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Old Mar 8, 2007 | 09:39 PM
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Honestly I like the idea, as long as you make the install clean it should look good. With aluminum you'll need a TIG welder, and if you dont know how to use one then you'll need to do a lot of practicing before you'll be able to make an entire rear diffuser. I'd recommend making it out of steel and using a MIG.
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Old Mar 9, 2007 | 01:44 AM
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Default Re: (JaydeemVTACKpowa)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaydeemVTACKpowa &raquo;</TD></TR><TR><TD CLASS="quote">Honestly I like the idea, as long as you make the install clean it should look good. With aluminum you'll need a TIG welder, and if you dont know how to use one then you'll need to do a lot of practicing before you'll be able to make an entire rear diffuser. I'd recommend making it out of steel and using a MIG.</TD></TR></TABLE>

steel is heavy and rust. aluminum would be the best choice while still being cheap.

btw, you should do alot fo research on aero before you start, or you could possibly be making your aerodynamics even worse.
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Old Mar 9, 2007 | 04:15 AM
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Default Re: (JaydeemVTACKpowa)

no, like pos_cd5 said, steel is heavy and rusts. Either go aluminum or go abs plastic like that guy did in that thread I linked.
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Old Mar 9, 2007 | 10:30 AM
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Default Re: (TouringAccord)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TouringAccord &raquo;</TD></TR><TR><TD CLASS="quote">no, like pos_cd5 said, steel is heavy and rusts. Either go aluminum or go abs plastic like that guy did in that thread I linked.</TD></TR></TABLE>

i only glanced at the thread you posted, but to me it looked like it was all sheetmetal.
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Old Mar 9, 2007 | 10:41 AM
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Default Re: (pos_cd5)

nope, it's all abs plastic. He does meantion it towards the end of the pictures. But he mostly talks about it in previous pages when he was in the design phase of it. On page 125 he lists the site that he bought it all from as well.
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Old Mar 11, 2007 | 06:46 AM
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just a thought for anyone thinking of doing this. Check out page 127 on that thread I posted earlier. Dave did some brief testing and found that the ABS isn't good where heat will be present. I know the use you were referring to is for the rear of the Accord where there isn't an engine but depending on how hot your exhaust gets it could be enough to warp the plastic like Dave experienced with his Integra. Just something to keep in mind.
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Old Mar 11, 2007 | 12:04 PM
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Default Re: Is this really a good idea? (93Accord117)

this will definitely help on the highway mileage....

the accord rear bumper is basically a parachute....with this, the car will feel more planted at speeds due to more rear downforce,

although you should think about getting a lower front lip to offset the added rear down-force.

check out this thread: it has a very good list of front lips for the CB7: Click to CB7 Ultimate Lip FAQ





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Old Mar 11, 2007 | 03:45 PM
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Default Re: Is this really a good idea? (lokuputha)

actually, the rear diffuser wouldnt give him anymore downforce, it'll reduce lift.
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Old Mar 12, 2007 | 06:53 PM
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Default Re: Is this really a good idea? (pos_cd5)

I stand corrected...u r correct about reducing lift rather than increasing downforce...
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Old Mar 14, 2007 | 07:00 AM
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Default Re: Is this really a good idea? (lokuputha)

that front lip looks so nice! where did you get that and how much did it cost? I would die for that thing. ooo
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Old Mar 14, 2007 | 07:07 AM
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Default Re: Is this really a good idea? (93Accord117)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93Accord117 &raquo;</TD></TR><TR><TD CLASS="quote">that front lip looks so nice! where did you get that and how much did it cost? I would die for that thing. ooo</TD></TR></TABLE>

ha, which lip? There is three different ones posted.
ALso, those aren't his, he got those pictures from the link he posted. Check out the link, from that you can find the picture you like, above it you'll find what lip it is. From there you can do a google search to find a retailer that sells it.
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Old Mar 14, 2007 | 09:10 AM
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Default Re: Is this really a good idea? (93Accord117)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93Accord117 &raquo;</TD></TR><TR><TD CLASS="quote">that front lip looks so nice! where did you get that and how much did it cost? I would die for that thing. ooo</TD></TR></TABLE>

1. Greddy 5th gen lip http://www.greddy.com

2.Mugen style lip http://www.ebay.com

3.?????
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