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Re: coupe handling ...i think its to good for a FW
[Re: F927UBS]
#714249
25/11/2008 10:54
25/11/2008 10:54
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Joined: Feb 2006
Posts: 5,390 Essex
Trappy
Forum is my life
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Forum is my life
Joined: Feb 2006
Posts: 5,390
Essex
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Right then all, As long as it's ok with per. I'm going to make some of these up. Anybody interested?
Cheers Tim I'd be interested but would like to see a full review of one fitted to a coop and tested. If it provided only a few kgs of extra downforce, them I'm sure it would be noticed on a track or even fast motorway b road driving. An idea of price would also help me make up my mind
F****** b****** thing...
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Re: coupe handling ...i think its to good for a FW
[Re: Trappy]
#714480
25/11/2008 14:30
25/11/2008 14:30
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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Ask any aerodynamic you trust and he will tell you it works! How many kg's one can only guess without a windtunnel test. Here's a pic showing the flow direction, how dirt/water has run along the top/diffusor ceiling, on one of the 2 middle plates: http://sfk.ibk.se/forum/attachment.php?s=12d503ef044dde83ba5f51cedc5faff3&postid=82608Actually, the fluid principals around this area are not that complicated as long as the rest of the floor is relatively flat. And the Coupe floor is VERY flat compared to most cars. Feel free to compare with most std. "diffusors" on today's cars which has become a trend.. Almost every is near useless. The 500 Abarth diffusor actually looks like one of the most valid ones! (another very "basic" area which works similar on many cars is the bootlid tail. That's why many upper-range cars have similar spoilers, such as the BMW M-cars, the Audi RS4, The AMG's etc. etc. The Coupe shape is not that different, so a "M3/M5-spoiler" is probably useful too. For better release/lower drag.)
Last edited by Per; 25/11/2008 15:33. Reason: Redd you're right on the Clio
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Re: coupe handling ...i think its to good for a FW
[Re: Per]
#714508
25/11/2008 15:12
25/11/2008 15:12
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Redd
Unregistered
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Redd
Unregistered
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per, on what basis do u claim the clio sport rear diffusor to be useless? i read that renault claims it produces significant downforce [40kg iirc?]. ive personally seen the diffusor and it's a better designed/made unit than the one on the coop. its larger, extends further into the car, and has the requisite 7-14deg rake.
the coop one is raked correctly but isnt near as large as the one on the clio.
redd
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Re: coupe handling ...i think its to good for a FW
[Re: ]
#714524
25/11/2008 15:25
25/11/2008 15:25
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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Ok that's a bad example from memory then, point is there are a lot of fake ones out there, just for looks. The Renault: http://car4sport.ru/img/Renault%20Clio%20Sport%20V6_1.jpgYes it looks quite good, although it looks steep that angle. I hope there is no sharp break at the beginning, then it might work well. Then again, who's going to make the effort to test the claims from Renault..? I think they calculated that too if you know what I mean. There is no diffusor on the Coupe as std. Flat floor yes.
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Re: coupe handling ...i think its to good for a FW
[Re: Per]
#714968
26/11/2008 10:15
26/11/2008 10:15
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Redd
Unregistered
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Redd
Unregistered
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per, there is a diffusor on the coop. what ur referring to as a "flat floor" on the rear is a diffusor. it just doesnt have the pronounced "strakes" [the stock one has small ones] and "end plates" which uv added on to your diffusor.
redd
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Re: coupe handling ...i think its to good for a FW
[Re: ]
#715026
26/11/2008 11:05
26/11/2008 11:05
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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This is really getting OT.. But Redd, there is a certain aerodynamic function (incl. "suction" due to growing area) to a diffusor, see this quick funny scetch a mate did the other day: http://sfk.ibk.se/forum/attachment.php?s=29937eaae5edc6199e4a0db4a8328c10&postid=54833Anyway there is none of that on the std Coupe, just a flat floor and also an bumper edge spoiling the flow at the end. I suppose what you could say is there's "half-a-diffusor" already. The "ceiling" of it.
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Re: coupe handling ...i think its to good for a FW
[Re: Per]
#715075
26/11/2008 11:49
26/11/2008 11:49
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Joined: Feb 2006
Posts: 5,390 Essex
Trappy
Forum is my life
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Forum is my life
Joined: Feb 2006
Posts: 5,390
Essex
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Per, would you say you noticed any different to your car's high speed stability after fitting your diffusor? I'm sure that if it was going to work, it would be doing so and (quite noticeably) at 80-100mph...
F****** b****** thing...
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Re: coupe handling ...i think its to good for a FW
[Re: Trappy]
#715105
26/11/2008 12:23
26/11/2008 12:23
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Joined: Jan 2006
Posts: 3,034 Sweden
Per
I need some sleep
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I need some sleep
Joined: Jan 2006
Posts: 3,034
Sweden
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No. But the difference would be the same as having a big bag at the back.. And on Autobahn I've always had the car full of load anyway.. So - hard to tell! A few kg's extra anyway, for sure.
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