Snorkle intake backwards, better fuel economy....GU8

[mudski]

Placebo affect maybe.
I really can't see how turning the snorkel backwards gives you better eco. Theoretically, it would be worse. But having said that. If you have the numbers, who am I to argue...

[june]

you also say in your first thread that you had the cruise control on. I thought this would make it worse. I am still not a believer of your test.

[WogsRus]

Cruise control for all highway runs, forward facing intake and backwards, this way it was comparative.

Doing the test again this Friday run number 6, wait and see i guess

[pascal1]

awsome thread!
- has anyone get figure comparing stock vs shornkel economy (before/after instal)?
- is the length/diameter of the shnorkel having any influence vs the needed flow?
- would the shnorkel be recommended only for (slow) offroad drives?
- can you guys easily disconnect the shnorkel (without unmounting) and revert to stock (say when on highways)?

(- last but not least: what happens with shnorkel facing sideway (in addition to the blow sound)?)

[Winnie]

Why would you ever want to disconnect the snorkel? If anything the air you are getting is ever so slightly cooler which would effectively better your fuel consumption.

If you're happy and you know it tap a post!

[twisty]

- has anyone get figure comparing stock vs shornkel economy (before/after instal)?

Yep. No change for me. But I do have a cleaner air filter.

[macca]

Interesting experiment Wogs, I can not turn mine so have no idea if it makes a change with my 4.2.
Thinking facing forward would have some positive pressure at the filter box and rear would be a little negative pressure. If car was doing 100kph with engine off I feel confident that is what you would see.
Does that mean your cars air to fuel mix is a little lean when the top is forward, that is slightly more air in the mix.
When turned the other way it runs a bit richer, higher concentration of fuel getting to the engine and it likes it.
The difference would be minimal, could it make a difference?
Like said before its one for Jamie & Adam on Mythbusters.

[riotpatrol]

Sideway would create vac like a chimney effect, maybe there is more positive pressure from behind, maybe you have hit a sweet spot in your air fuel ratio?

[riotpatrol]

Maybe air pressure coming off the windscreen surrounds? The A9X Torana scope faces backwards at the high pressure area at the base of the screen.

[Drew]

Could the ram air effect be messing with the MAF (giving it a slightly different figure) than what would be without the snorkle ?