As above.

For my Westfield SEIW.

Or even a guide to make one would do.

Thanks

Hi, there are a few folks who advertise in the westie oc mag and there was an article on how to make one over a couple of issues, on the westie forum search diffuser and you will find , if your not in to much of a hurry I can pop up inverness way once I get my plates ......
http://www.carbon-nv.co.uk/products.html
http://forum.wscc.co.uk/forum/index.php/topic/114516-diffuser-as-seen-in-club-mag/
look for andy lower down in the comments on the 2nd link
Hope to see you about soon
Gary

Personally not sure the low aero of a 7 type car warrants a complex rear diffuser myself. Simply a flat sheet boxing off the underside of the rear should give you the same (or better) improvements.

What Nick205 said.


Flat floor the car from front to back as a first step and develop from that point.

Speak to Julian at Aerodynamic - he had a load he was trying to shift when he put his business on hold. I bought one and it cleans up the rear end a treat, also stops much going in the void in front of the fuel tank.

Anything to close off the rear end will stop the 'parachute' effect which causing drag and lift.
To be fair, as has been said the underbody aero is a mere sticking plaster for the problem that is the 'over car' aero on a 7type. Flat flooring to clean up flow inc engine bay and careful choice of arches, will reduce negative effects though so well worth doing.
Simon McBeath wrote an article for Racecar engineering mag on a Caterham they had in MIRAs wind tunnel and drammati gains from arch design, fairing for silencers etc, many of which are to be seen on hillclimbing and racing 7s still today. Worth a google.

Also pics of the Dick Spanner racing orange Westfield of Derek Hodder, small mods but highly effective

I bought one from Playskool

GBS do various colours

GRP Black Rear Diffuser - GBS Zero,Kit Car - Fibreglass - GRP0022


Andi