Worse MPG with K&N drop ins?

Maila87

Since have installed K&N drop ins and ECU has been reseted. Z is getting worse MPG. The drop down is on highway from around 26 to 22 MPG.

Is this unusual, or have to get used to?
Guess, that it could be caused by ECU putting more fuel to keep A/F ratio.

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-->2005-6 Nissan Micra 1,3i CVT 72PS Red MY 98 -->2006-8 Nissan Almera 1,5i N16 96PS Red -->2007-8 Skoda Fabia Combi 1,2HTP 3 cylinder 60PS Green -->2008-11 AUDI TT 2,0TFSI FWD S-tronic 200PS Red MY06 -->2011 Nissan 370Z manual White Pearl

Methodical4u

that doesn't make much sense. The better filter causes less restriction and should get better mileage.

TreeSemdyZee

Are you actually measuring your gas mileage, or are you just going by the info center?

ChrisSlicks

The info center will be accurate regarding the change. It's not like he swapped out fuel injectors.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

nvrbacardi

You had 26 MPG When I put my K&N filters I went from 20 MPG to 22 MPG. IMO that 26 MPG is way high for a Z. I believe the number you are seeing right now is what you are supposed to have.

When I added the HPS tube it went up to 23.7 MPG

edub370

mine is just over 20 with aftermarket filter. i thought 26 mpg on these things was impossible

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Maila87

It is on specific route. I'm not info center but really curious.

No, injectors are still same. Just switched from original filters to K&N. And yes, I guessed, that MPG should be same at least

Another ECU reset should help. Engine is new with 2200 miles done, so it should be getting better.

Any suggestions?
With previous filters I done 40 MPG once in midnight cruising at 50-60 MPH.

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-->2005-6 Nissan Micra 1,3i CVT 72PS Red MY 98 -->2006-8 Nissan Almera 1,5i N16 96PS Red -->2007-8 Skoda Fabia Combi 1,2HTP 3 cylinder 60PS Green -->2008-11 AUDI TT 2,0TFSI FWD S-tronic 200PS Red MY06 -->2011 Nissan 370Z manual White Pearl

Abdiel

switch back to your original filters (without ECU reset) and see if the mpg changes.

if mpg stays the same even with your original filters, it could be that the ECU is keeping a/f on the rich side for safety while it relearns (just a guess).

6MT

My thoughts are.... who cares what the mileage is? It's a fire-breathing VQ, not a Firefly.

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Andrew

2009 370Z Sport/Touring 6MT sold
2013 Honda Civic Si coupe D/D

fuct

i say dont start counting gas millage until you 10k miles...... mine varied so much in those first 10

Maila87

It was first thing, what I thought about.
HPS tubes are ordered, so we'll see if it make some difference.

VQ are grass eating beast, but sometimes you have to cruise and in this situations I check MPG

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-->2005-6 Nissan Micra 1,3i CVT 72PS Red MY 98 -->2006-8 Nissan Almera 1,5i N16 96PS Red -->2007-8 Skoda Fabia Combi 1,2HTP 3 cylinder 60PS Green -->2008-11 AUDI TT 2,0TFSI FWD S-tronic 200PS Red MY06 -->2011 Nissan 370Z manual White Pearl

edub370

VQ's are not herbavors!

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BuckeyeZ

I have installed K&N drop-ins on several vehicles and I have always seen a very small increase in my fuel mileage. Generally, I would get about 1-2MPG better.

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Stillen | EVO-R | HPS | K&N | Hotchkis | Modshack Oil Cooler | SPL

wh1te370z

whats gas milage?

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1998 BMW 328is... Track Build
2010 White 370z.... sold

Methodical4u

I averaged 25.6 on my second tank of gas and that was around town, highway, stop and go traffic, etc. It's very possible to get these cars to get good mileage. Add in some AMSoil SSO 0-30 and free flowing exhaust, intake, etc and 2 mpg should be the very minimum gains you see.