Fuel consumption & snorkels

charlies, have you checked your air filter, I have found significant insect impact on mine that could combined with the dust increase fuel useage. I did hear the turbo a bit more buy don't know about fuel useage.

G'day Charlie
Had the same problem, so checked air cleaner and found it was fairly dirty.
Just replaced it 2 days ago so will wait and see if I get better results now.
Cheers Poppy

See my post 20917 (and subsequent comment). Sounds a monty for the restrictor to me..... but not all snorkel fitments in that brand have a restrictor. Apart from the noise I had, I do recall laying a smoke trail on acceleration (seen at night in following headlights - not strong enough to see in daylight) - that smoke being half burnt fuel of course - my economy would have been suffering (not measured). While my problem noise is gone and the smoke is gone, I do get a bit of harmonic noise from the snorkel but I want efficient breathing !

Its not uncommon to get a slight increase in fuel use with a snorkel.

15- 18% on . . . what 13/100 or so , is still only around 1-2/100 per hundred extra.

Not a lot when you consider the benefits on having one fitted.

I don't have a snorkel but am looking at fitting one.
The salesman at tow well known 4wd shops told me I would get better fuel consumption (less litres / 100k) due to the ram effect of the snorkel anfd better breathing.
I assume this does require the snorkel to be a larger dia than the rest of the intake :-).
Sounds like this is not the case! Correct?

Had a snorkel put on the GU about a year ago. Fuel consumption is much the same, but I don't pay too much attention to it. City driving I average around 860 K's to about 117L. I havn't done a country run that hasn't involved 4WDriving or I hav'nt been towing, so I can't say.

I have recently noticed the smoke at night as stated above. But only when I give it a boot full and it takes a second or two for the auto to kick back, then no smoke, lots of go.

When off road, people following me often say they can't believe its a diesel, cos they never see any smoke. (and it goes so quick. te he)

Any air ram effect would only possibly happen at high speed --- over 90. Same as the intercooler on the top is only truly effective when cruising at 80 or more. The biggest positive with the snorkel, and this is why I got one.....
The aircleaner is now always clean.

I put the so called air ram effect down to pure sales hype - plain physics suggests that the plumbing with the twists turns and simple surface drag would negate most of the ram effect at anything less than significant speed. With the restrictor in place (the customer is kept in the dark on that) on some models, the ram air effect could be close to the purest bulls**t you'll ever hear over a sales counter.

Yep - forgot to say - my primary reason for having the snorkel fitted was to get clean air to the filter - the original setup was hopeless in the bush - sucking air in from the wheel well.... very dirty, very soon.