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Old 09-06-2011, 04:55 PM   #21 (permalink)
What colour should it be?
 
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Quote:
Originally Posted by euromodder View Post
Nobody on here has been able to proof they do improve FE, and it wasn't for lack of trying

I still think they could work, but not in the usual massively/truck-sized variety on a regular car.

Something more subtle might do the trick. Renault / Dacia had them on the rear roof line of their eco-Logan.
OK, but Dacia probably had some wind-tunnel time via Renault to try things out ?

We know there is a return with some people from a grill block (although both you and I have tried these and not seen a significant difference - but that might be the difference in Euro vs US driving conditions - long cruises and journeys in the US vs. our more busy and choked roads).

We have seen coast downs with boat tails which seems to suggest an improvement and with wheel covers (front and rear), new noses, wheel spats, mud flaps removal or reversal. Even some differences with mirrors folded and removed vs not.

The coast downs with tabs suggest minimal effect and threads testing them on cars longer term show no difference at all as far as I can tell, or whatever difference is recorded could well be inside an error range.

So at the moment we have to say at best "maybe" or it has "potential", but on a firm this-makes-a-firm-difference basis we have to say "no".

@Neil - I would love to see those instructions and for someone to do some proper testing having followed them.

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Old 09-08-2011, 08:31 AM   #22 (permalink)
dcb
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Quote:
Originally Posted by Arragonis View Post
We know there is a return with some people from a grill block
The difference is that the barriers to implementing a grill block are about non-existant. I think the first one was wet newspaper or something, any sort of material can be bodged into a grill block (of varying durability), you can prototype one with coloured duck tape, or even cram neglected beanie babies into your grill.


Quote:
Originally Posted by Arragonis View Post
So at the moment we have to say at best "maybe" or it has "potential", but on a firm this-makes-a-firm-difference basis we have to say "no".
VG's for fuel efficiency are surrounded by mystery, or bullocks if you prefer. There is no end to the number of things you could be told you are doing wrong after trying them, it isn't well defined how it is supposed to be helping car efficiency. There simply is no defined theory as it relates to efficiency or it's application. The potential here seems not worth mentioning in the "I think someone else should try this" sense, what you do with your own time is a different matter.

Quote:
Originally Posted by Arragonis View Post
@Neil - I would love to see those instructions and for someone to do some proper testing having followed them.
I'm confused, you don't think these other people did proper testing? On what basis?
Google Custom Search

Can you properly define proper testing of vortex generators? Can you also define proper testing for non-existence of invisible pink unicorns?
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Old 09-08-2011, 09:44 AM   #23 (permalink)
What colour should it be?
 
Join Date: Oct 2009
Location: Englishman living in Scotland
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George - '11 Toyota Aygo Go!
Team m8
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Quote:
Originally Posted by dcb View Post
Can you properly define proper testing of vortex generators?
A-B-A, of which your search picks up quite a few I thought maybe Neil had something new. Maybe not.

Picking through the first page of results at random, nobody seems to show a measurable effect on FE, certainly not the "riches and world peace" claimed by the makers. The MIRA test linked in one of the posts seems to show about 2.8% improvement on a truck.

Quote:
Originally Posted by dcb View Post
Can you also define proper testing for non-existence of invisible pink unicorns?
Heretic...

EDIT - The MIRA test appears on the Airtabs website too. But from memory I haven't seen any ParcelFarce trucks with tabs on that I can remember. Going to track one down and photo it.

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