Post #26
stick the spare wheel back on 
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need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets.
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| Author | Subject: Rear Diffuser |
 welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Bring on the Trumpets. |
 Posted 28th Apr 2012 at 12:14
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #27
Most aero mods are a comparative waste of money/time on regular cars, they sit too high for ground effect, have lousy drag coefficient and don't have the power to reach the speeds where aero comes into its own anyway.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 28th Apr 2012 at 12:15
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marco gti6
Seasoned Pro  Location: Troisvierges Registered: 09 Mar 2009 Posts: 1,350 Status: Offline |
Post #28
Interesting topic  I'll keep an eye on this |
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Posted 28th Apr 2012 at 12:16
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buzzbrightyear
Seasoned Pro  Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,894 Status: Offline |
Post #29
welshpug! wrote: stick the spare wheel back on Swirl pot and fuel pump in way now, that's why I removed it. ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 28th Apr 2012 at 12:38
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #30
buzzbrightyear wrote: welshpug! wrote: stick the spare wheel back on Swirl pot and fuel pump in way now, that's why I removed it. Same as mine.  I have thought about this issue in the past when the spare wheel gubbins was all taken out, it does create a void space before the rear bumper which must be producing a "parachute" effect to a degree. I just think that it isn't that huge a problem especially with a road car that you would need to combat it with any kind of mod. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 28th Apr 2012 at 13:30
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manthos
Seasoned Pro  Location: Norwich Registered: 29 Apr 2009 Posts: 1,966 Status: Offline |
Post #31
I've thought about a full undertray for a while. Think a diffuser will look good if subtle but not do too much however the parachute effect could be solved just by drilling some holes in the back bumper. Will keep an eye on this though.________________________________________ Team SUPERCHARGED I LIVE FOR THE 306 Old Project thread Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url = |
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Posted 28th Apr 2012 at 16:56
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #32
drilling holes if anything will make it worse, just cut the middle out.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 28th Apr 2012 at 17:00
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #33
welshpug! wrote: drilling holes if anything will make it worse, just cut the middle out. I agree, although if you drill holes or cut the middle out it will look gash, unless some sort of diffuser was installed somehow. I know I wouldn't want to "cut" my bumper apart to be honest. This is an interesting topic though, and I look forward to see if anyone comes up with a decent idea of combatting it.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 28th Apr 2012 at 18:51
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #34
just a simple flat sheet from the tank backwards should suffice ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 28th Apr 2012 at 18:56
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eddy_gti6
Seasoned Pro  Location: Durham Registered: 20 Oct 2008 Posts: 8,716 Status: Offline |
Post #35
Been pricing thingd up and itd gona cost around £300 to do a full undertray with front splitter and rear diffuset what is far too expensive i think. What about blanking the pocket where the spare wheel was with a plastic or aluminium sheet? ________________________________________ Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & = |
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Posted 28th Apr 2012 at 18:58
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davedgti6
Seasoned Pro  Location: whiston, prescot Registered: 28 May 2006 Posts: 1,651 Status: Offline |
Post #36
welshpug! wrote: just a simple flat sheet from the tank backwards should suffice That's what I was thinking, being a Joiner I was thinking of just using a piece of 10mm marine plywood sprayed black, cut to shape and kept away from the exhaust a bit, this would cover my swirl pot and fuel pump etc, if it proved to be a benefit then could get some aluminum cut to the same size as the ply, the plywood would be free for me too  ________________________________________ Team Supercharged Gti-6™ |
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Posted 28th Apr 2012 at 19:07
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clen666
Seasoned Pro  Location: Co. Durham Registered: 12 Feb 2009 Posts: 2,401 Status: Offline |
Post #37
You can get a 3m x 1.5m sheet of that composite aluminum for about £100, not sure how heavy or rigid it is though  ________________________________________ Team 'unintentional rat look' |
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Posted 28th Apr 2012 at 19:27
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eddy_gti6
Seasoned Pro Location: Durham Registered: 20 Oct 2008 Posts: 8,716 Status: Offline |
Post #38
Polycarb should do the job, i have plenty of that  ________________________________________ Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & = |
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Posted 28th Apr 2012 at 19:50
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #39
davedgti6 wrote: welshpug! wrote: just a simple flat sheet from the tank backwards should suffice That's what I was thinking, being a Joiner I was thinking of just using a piece of 10mm marine plywood sprayed black, cut to shape and kept away from the exhaust a bit, this would cover my swirl pot and fuel pump etc, if it proved to be a benefit then could get some aluminum cut to the same size as the ply, the plywood would be free for me too Seeing as you can get the material for free then Dave, you try it and post the results... Question is though, once you've fitted it how are you accurately going to test it to see if it's made an ounce of difference? Do you have access to a windtunnel?? ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 28th Apr 2012 at 21:54
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eddy_gti6
Seasoned Pro Location: Durham Registered: 20 Oct 2008 Posts: 8,716 Status: Offline |
Post #40
Loads of tabs and a hair sryer should do the job  ________________________________________ Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url & = |
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Posted 29th Apr 2012 at 01:39
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mik
Seasoned Pro  Location: Kent Registered: 17 Feb 2011 Posts: 2,100 Status: Offline |
Post #41
These sorts of subjects are covered here. Especially: Modifying Undercar Airflow Part 1 Modifying Undercar Airflow Part 2 These articles include some test results of experiments on road cars. Based on these articles I am going to install the front wheel "fences" you see on a lot of modern cars including my wife's Mk2 Ford Focus, a factory Pug engine undertray, and possibly a simple flat plastic panel attached to the spare wheel carrier to reduce the parachute effect. To do this I was going to use 3mm black plastic sheet from ebay (though the rear wheel cover might need 4mm for rigidity). I was not going to use expensive stuff. Even at motorway speeds there will be little real difference, but it might improve things slightly and it is a bit of fun. ________________________________________ Cherry Rallye SOLD |
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Posted 29th Apr 2012 at 11:30
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,894 Status: Offline |
Post #42
Ferrari underside:http://honda-tech.com/attachment.php?attachmentid=170472&stc=1&d=1288178092 thread on a Honda forum about same subject, I might read it myself later. http://honda-tech.com/showthread.php?t=2854103 it's just the rear bumper that I was interested in to try improve the parachute effect, if you want to improve the more technical side of it then theres not much point unless you've got a lotta money to waste. ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 29th Apr 2012 at 11:58
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fatlapit
Seasoned Pro  Location: STOCKSFIELD Registered: 02 Nov 2010 Posts: 3,040 Status: Offline |
Post #43
not sure you will need a diffuser as i dont think the 6 can go fast enough________________________________________ |
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Posted 29th Apr 2012 at 18:36
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dangti6
aka JKshooter  Location: Taunton, Somerset Registered: 15 Jun 2006 Posts: 10,305 Status: Offline |
Post #44
Marine ply FTW. Saw several of the touring cars sporting it at Thruxton today. ________________________________________  |
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Posted 29th Apr 2012 at 18:43
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fatlapit
Seasoned Pro Location: STOCKSFIELD Registered: 02 Nov 2010 Posts: 3,040 Status: Offline |
Post #45
but the touring cars have aero packages on them a diffuses wont do alot by itself________________________________________ |
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Posted 29th Apr 2012 at 19:11
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #46
dangti6 wrote: Marine ply FTW. Saw several of the touring cars sporting it at Thruxton today. In what capacity were they using it Dan? ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 29th Apr 2012 at 19:34
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eliotrw
Seasoned Pro  Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #47
I reckon its worth plugging the parachute. But making a proper diffuser is more hassle than I could be bothered with.________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 29th Apr 2012 at 20:45
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #48
eliotrw wrote: I reckon its worth plugging the parachute. But making a proper diffuser is more hassle than I could be bothered with. This ^^ If you managed to smooth out the airflow and block up the gap before the rear bumper it would be beneficial to straight line speed but only up the top end. A proper diffuser would cost thousands to design and implement, and I don't even think you would see a 'real' difference on the track to be honest in terms of cornering ability. I am still interested in a proper neat solution to the parachute issue though. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 29th Apr 2012 at 23:32
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #49
A few hours with some 2mm ally and a riveter should see it dione.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 29th Apr 2012 at 23:34
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #50
daveyboy wrote: A few hours with some 2mm ally and a riveter should see it dione. See if you can knock up a prototype and then post pics of it attached to the car. You never know, you could patent it and start selling them as a genuine aftermarket product. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 29th Apr 2012 at 23:48
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