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22nd June 2013, 11:22 AM
#51
Well ok just to convince myself, turned the snorkle facing forwards, cold morning like 2 deg C including Black ice, fuel economy according to Ultra Gauge was 12.8, n the way back, turned it back and got to 11.2.
I have not idea WTF is going on ut it works for meeeeeeeeeeeeee
SHINY AND NEW: 2015 Series 2 Y62 Ti in White. Bone stock, hate to say it but its the wifes car this time.
OLD SOLD:Silver 50th Anniversary Patrol, 2" Pro-Comp Lift, 32" MT ATZ 4 Rib, 9000lb Warn Winch, UH7700NB + BT UHF Brilliant. Ultra Gauge and some GO FAST bits........
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The Following 3 Users Say Thank You to WogsRus For This Useful Post:
blocko05 (19th September 2015), mudnut (22nd June 2013), Stropp (22nd June 2013)
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22nd June 2013 11:22 AM
# ADS
Circuit advertisement
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18th July 2013, 01:44 AM
#52
lots of ways to look at this one,
forward facing = lean mixture and the foot goes down to achieve speed, as noted 120kph
backwards = factory settings for mixture,
(assuming factory tune is minus the snorkel).
less right foot for same speed 120kph and improve economy.
engine conditions and tune!!
driving habits from each individual.
then a tail wind can also make a big difference.
lots to get ya thinking, this forum is soooo usefull.
IF IT'S NOT A NISSAN.
THEN IT'S A COMPROMISE
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18th July 2013, 08:40 AM
#53
Patrol Freak
Wouldnt this be due to the MAF sensors (mass air flow sensor)? It calculates the air flow and corrects the fuel mixtures.. turning the snorkel backwsrds creates negative pressure which reduces the air going into the engine and then adjusts the fuel accordingly.
Be interesting to see how the carbys go. Probably starve of fuel
'92 (MIGHTY) GQ ST 3.0L Duel Petrol / LPG, 2" Pedders Suspension Lift on 33x12.5x15 BigHorns
Lukey 2.5" Performance Exhaust with Extractors, snorkel
Auto Lokka In The Front, Duel Batteries, Stiff Deep Dish Steering Wheel,
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18th July 2013, 08:50 AM
#54
Patrol God
Melbourne to the Murray river say 250 Ks What ppl don't know its up hill all the way.
Big fuel difference if you fill at the Murray and drive south, usually with a howling tail wind
and down hill, Just had snorkel fitted and has made no difference so far to economy.
Maybe summer I'll be sourcing cooler air, cant see how it makes a difference as it stops at
the filter. I'm getting about 330k to half tank and 560k when light comes on.
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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23rd August 2013, 04:03 PM
#55
Just to see for myself, I turned my genuine Nissan snorkel head sideways as it won't do a full 180 without hitting windscreen.
I was sceptical but last full tank returned 12.8lt per 100k instead of usual 13.25 to 13.75. No change to driving conditions.
Going over to the Island early September so sand driving will distort figures but will check again when I return to normal driving.
It doesn't make sense but appears right.
At the end of the day, all you have is yourself and all you need is your friends (and in our case our Patrol)
2006 GUI1 4.2TDi Coil Cab "almost" standard
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23rd August 2013, 05:08 PM
#56
Patrol God
Originally Posted by
threedogs
melbourne to the murray river say 250 ks what ppl don't know its up hill all the way.
Big fuel difference if you fill at the murray and drive south, usually with a howling tail wind
and down hill, just had snorkel fitted and has made no difference so far to economy.
Maybe summer i'll be sourcing cooler air, cant see how it makes a difference as it stops at
the filter. I'm getting about 330k to half tank and 560k when light comes on.
thats about the same as mine it would vary as driving style is different
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The Following User Says Thank You to Sir Roofy For This Useful Post:
threedogs (6th April 2016)
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23rd August 2013, 05:13 PM
#57
Patrol God
Well my snorkel has improved my economy I now get 360 to
half tank and 12.6 /100 k around town on 305 muddies,
snorkel will remain facing forward
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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23rd August 2013, 06:12 PM
#58
Expert
A turbo vehicle will only use the air that is needed, any more and it is expelled out the wast gate. So I would think forced in air is a small factor. As a turbo will suck the air that it needs, so then facing the snorkel to the back should not matter other than supplying cleaner air. Threedogs is also right, coming up to the Murray is all up hill.
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23rd August 2013, 08:15 PM
#59
hi guys , interesting thread .
wogsrus I just had an idea , if you set your ultra gauge to read the MAF sensor then get the patrol upto 100kpa on the highway and see what the maf reading is . do this with the snorkel facing forward , then try it backwards . this would let us know weather or not changing the snorkel direction changes the maf sensor reading , which I assume would change the fuel mixture . over the years I've heard people mention that they get better mileage with a snorkel , but can't remember anyone saying they had better mileage with the head turned backwards until common rail motors came along . ray
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5th April 2016, 08:46 PM
#60
very interesting read.
did anhyone tryt it with a carb yet?
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