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Author Subject: Rear Diffuser
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline
Post #51
Not allowed to fit one to my race car as it contravenes the regs, I'd be happy to knock one up for a paying customer though Whistle

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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
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Posted 29th Apr 2012 at 23:51
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eddy_gti6

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Location: Durham

Registered: 20 Oct 2008

Posts: 8,716

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Post #52
What would you do with the exhaust? If either blanking the gap up in the back or fitting a rear diffuser isnt the exhaust going to just get in the way?

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Posted 30th Apr 2012 at 01:39
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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline
Post #53
eddy_gti6 wrote:
What would you do with the exhaust? If either blanking the gap up in the back or fitting a rear diffuser isnt the exhaust going to just get in the way?


I can't see the exhaust bieng much of an issue, it fills part of the parachute area quite nicely all by itself, I'd be tempted to just sheet off all the areas around it. (you wouldn't want to enclose it as all the trapped heat would be bound to cause something in the floor to melt etc.)

________________________________________

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
Posted 30th Apr 2012 at 10:47
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dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

Posts: 10,305

Status: Offline
Post #54
stan_306gti6 wrote:
dangti6 wrote:
Marine ply FTW. Saw several of the touring cars sporting it at Thruxton today.


In what capacity were they using it Dan?


I may have pictures. Will check later. The Honda's IIRC had 15mm thick marine play as a 3 foot deep splitter/undertray. One was painted, the other you could see the layers.

A Vectra which was having a new front end fitted after a smash had a large section of thin ply hidden away up and under the front bumper for aerodynamics.

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    • Posted 30th Apr 2012 at 11:05
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    phillipm

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    Location: Rotherham

    Registered: 15 Oct 2006

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    Post #55
    It's great for splitters, they usually get trashed or wear away, and it's cheap and easy to form.

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    Posted 30th Apr 2012 at 11:45
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    fatlapit

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    Post #56
    Side exit exhaust?????

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    Posted 30th Apr 2012 at 11:49
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

    Posts: 25,817

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    Post #57
    yup, looked like most of them were now (BTCC cars)

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    Posted 30th Apr 2012 at 12:26
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    buzzbrightyear

    Seasoned Pro

    Location: hiding all receipts for car

    Registered: 09 Jul 2008

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    Post #58
    Could always do a rolling road before and after to see what top end speed results are between the new undertray parachute filled version and the standard parachute bumper.

































    Joke.

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    andrew315rawson@live.co.uk
    Moonstone phase 7 gti6
    My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
    Posted 30th Apr 2012 at 14:25
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    eliotrw

    Seasoned Pro

    Location: Southwark

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    Post #59
    buzzbrightyear wrote:
    Could always do a rolling road before and after to see what top end speed results are between the new undertray parachute filled version and the standard parachute bumper.
    LOL

































    Joke.

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    Ex- Phase 3 China GTi-6 T-Reg
    Posted 30th Apr 2012 at 14:27
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    daveyboy

    aka Jim Davey

    Location: Southampton

    Registered: 01 Oct 2007

    Posts: 8,648

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    Post #60
    I think the more telling figure would be MPG, as lets face it, how many of us are regularly sit near the limiter in 6th wishing we were a little more aerodynamic? If it does reduce drag you should see a small gain in fuel economy.

    ________________________________________

    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
    Posted 30th Apr 2012 at 14:36
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    buzzbrightyear

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    Post #61
    yeah true, mpg run on the rollers then?

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    andrew315rawson@live.co.uk
    Moonstone phase 7 gti6
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    Posted 30th Apr 2012 at 14:40
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    stan_306gti6 Forum Admin

    Location: Kent

    Registered: 18 Jan 2004

    Posts: 21,768

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    Post #62
    buzzbrightyear wrote:
    yeah true, mpg run on the rollers then?


    LOL

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    Posted 30th Apr 2012 at 14:42
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    fatlapit

    Seasoned Pro

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    Post #63
    if your near the limiter just turn the boost up!!!!!!.................. oh u cant Smile

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    Posted 30th Apr 2012 at 18:39
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    stan_306gti6 Forum Admin

    Location: Kent

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    Post #64
    fatlapit wrote:
    if your near the limiter just turn the boost up!!!!!!.................. oh u cant Smile


    No-one likes a smart arse...LOL

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    "Supercharged - 454.1bhp/317.5lb/ft"
    Peugeot 306 GTi-6
    2000 (X), Moonstone Love
    Posted 30th Apr 2012 at 18:50
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    mik

    Seasoned Pro

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    Post #65
    daveyboy wrote:
    I think the more telling figure would be MPG, as lets face it, how many of us are regularly sit near the limiter in 6th wishing we were a little more aerodynamic? If it does reduce drag you should see a small gain in fuel economy.


    If you look at the links I posted earlier, the Aussie bloke gets an alleged additional 10% fuel economy by putting a better front undertray on his Prius - which already has a low CD.

    I saw some posts on a VW forum where people were putting TT underbody in-fill pieces on their Golfs. If Audi can be bothered to produce the parts, they must have some sort of effect.

    An extra 10% extra range would be welcome on long trips.

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    Posted 30th Apr 2012 at 18:53
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    stan_306gti6 Forum Admin

    Location: Kent

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    Posts: 21,768

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    Post #66
    mik wrote:
    An extra 10% extra range would be welcome on long trips.


    I agree, it does make you think just how much drag the 'parachute' effect rear bumper is having on our MPG.

    Until this conversation started, it wasn't really something I ever thought about before. Crazy

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    "Supercharged - 454.1bhp/317.5lb/ft"
    Peugeot 306 GTi-6
    2000 (X), Moonstone Love
    Posted 30th Apr 2012 at 19:30
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    eddy_gti6

    Seasoned Pro

    Location: Durham

    Registered: 20 Oct 2008

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    Post #67
    stan_306gti6 wrote:
    mik wrote:
    An extra 10% extra range would be welcome on long trips.


    I agree, it does make you think just how much drag the 'parachute' effect rear bumper is having on our MPG.

    Until this conversation started, it wasn't really something I ever thought about before. Crazy


    Laugh my ass off sorry stan

    As said on his link he done a before and after rest run. But in a priuse i cant see it costing too much but in a gti6 i can see it costing a fair bit more.

    I might still look into getting something knocked up when i come round to messing on with the rear of my car but will be a couple of weeks yet. Still trying to find the best material to use. Something thats going to be light and not melt from the exhaust heat.

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    Posted 30th Apr 2012 at 19:39
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    phillipm

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    Post #68
    Not quite as much as you'd expect, the airflow stalls under there and forms an air dam anyway.

    ________________________________________

    - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
    Email me!
    Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
    Posted 30th Apr 2012 at 19:46
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    stan_306gti6 Forum Admin

    Location: Kent

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    Post #69
    phillipm wrote:
    Not quite as much as you'd expect, the airflow stalls under there and forms an air dam anyway.


    Maybe, but it has still got to be causing unwanted drag in a straight line surely?

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    "Supercharged - 454.1bhp/317.5lb/ft"
    Peugeot 306 GTi-6
    2000 (X), Moonstone Love
    Posted 30th Apr 2012 at 19:48
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    phillipm

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    Post #70
    Oh, it can be improved upon I've no doubt, but you don't have the parachute effect you'd imagine back there.

    ________________________________________

    - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
    Email me!
    Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
    Posted 30th Apr 2012 at 19:59
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    stan_306gti6 Forum Admin

    Location: Kent

    Registered: 18 Jan 2004

    Posts: 21,768

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    Post #71
    Interesting stuff, cheers Phil. Smile

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    "Supercharged - 454.1bhp/317.5lb/ft"
    Peugeot 306 GTi-6
    2000 (X), Moonstone Love
    Posted 30th Apr 2012 at 20:22
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    fatlapit

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    Location: STOCKSFIELD

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    Post #72
    hmm i been keeping a close eye on this thread and i think its a good idea but the car will have to be flat underneath from front to back and be no more than 2.5" off the floor to have a real effect i belive and imo.

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    Posted 30th Apr 2012 at 20:49
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    daveyboy

    aka Jim Davey

    Location: Southampton

    Registered: 01 Oct 2007

    Posts: 8,648

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    Post #73
    I have fancied making one for some time, but as I mentioned, DMN doesn't allow underfloor aero apart from a front splitter, and even that is strictly goverened as to how far the tray of the diffuser can extend back under the front of the car.

    ________________________________________

    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
    Posted 30th Apr 2012 at 20:54
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    fatlapit

    Seasoned Pro

    Location: STOCKSFIELD

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    Post #74
    however it is a hatch perhaps the most un aerodynamic shape going

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    Posted 30th Apr 2012 at 21:09
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    fatlapit

    Seasoned Pro

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    Post #75
    stan_306gti6 wrote:
    fatlapit wrote:
    if your near the limiter just turn the boost up!!!!!!.................. oh u cant Smile


    No-one likes a smart arse...LOL


    or the truth Dunno

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    Posted 30th Apr 2012 at 21:09
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