What MPG are you getting after going F.I.

Alstann · 03-31-2013, 02:08 AM

Considering closed loop maps (i.e. cruising or low throttle), I don't really see a reason why a turbo kit would decrease MPG. The car is just trimming itself to 14.7 AFR, and beyond that, a tune that controlled open loop (WOT) behavior wouldn't really be beneficial, would it? As long as the car is able to steadily maintain it's target stoich. AFR, the turbocharger setup should increase efficiency.

Even though they are restrictions, per se. Of course, maybe I'm just speculating. :P

Baer383 · 03-31-2013, 08:49 AM

I think this thread is funny,talking about MPG in a FI car that's like a super model talking about how she needs weight reduction.

MMC Racing · 03-31-2013, 10:32 AM

On the 350z we had with Vortech, the day to day driving MPG loss was 2.

Dzel · 03-31-2013, 11:39 AM

I'll tell you what you guys send me a TT kit and I'll run test for you with chats graphs and even pop up books! Lmao

esfourteen · 03-31-2013, 09:18 PM

15mpg avg was my last fill up, quite a few 140+mph pulls

theDreamer · 04-01-2013, 11:10 AM

Quote:

Originally Posted by m3chhawk

Don't forget FI almost always includes free flowing exhaust, no catalytic converter, and more efficient intake designs. Couple these with a custom tune and there is much more leading to the efficiency increase than the turbo/boost.

That is true, but you also have to consider that the tune is where it takes advantage of all of those changes.
And I would bet most are designed to harness that open exhaust/intake design as quickly as possible to build power quickly. In the end I really really really doubt anyone is getting 30+ MPG on any forced induction VQ37.

elperuano · 04-01-2013, 12:26 PM

can't believe people still thinkin that.

Motion Lab · 04-01-2013, 12:57 PM

Quote:

Originally Posted by theDreamer

That is true, but you also have to consider that the tune is where it takes advantage of all of those changes.
And I would bet most are designed to harness that open exhaust/intake design as quickly as possible to build power quickly. In the end I really really really doubt anyone is getting 30+ MPG on any forced induction VQ37.

By making the power easier you are increasing the efficiency of the motor which means less fuel will be required to make the same amount of power. This will then increase fuel economy based on how you are driving. Coupled with optimizing the fuel injection via UpRev, it can make a pretty good difference on the car. If your in it to win it at every stop light you will never have a very good MPG rating haha. Even a stock g37 we tuned who drove down from New York averaged 19mpg on the way down and 25mpg on the way back up after the tune and exhaust installation.

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

Thanks,
Alex Goodwin
AlexG@motionlabtuning.com

elperuano · 04-01-2013, 04:57 PM

LafitteZ · 04-26-2013, 06:51 PM

my tt370z I run average 30 mpg with my stage 2 setup.
Manual
light flywheel and clutch
greddy turbo tic with down pipes
volk 19s with 295/30 and 255/35
unorthodox crank pulley.
My twin turbo g37 is horrific on gas.
Auto
Drive it conservative mabe 20mpg.
20 inch volks
down pipes and exaust
In the 370 I left new orleans with a full tank then filled up with gas in georgia going to z nats. we was with a bunch of guys so we did a little playing around going up there. had me and my gf and luggage in the car.

DIGItonium · 04-26-2013, 06:56 PM

With my driving habits I pretty much get the same fuel economy which is around 22-23 MPG combined. Do you guys think 10% ethanol would drop fuel economy as well?

Chuck33079 · 04-26-2013, 07:02 PM

Quote:

Originally Posted by DIGItonium

Do you guys think 10% ethanol would drop fuel economy as well?

Yep. Ethanol is godawful for mileage.

Z370Z011 · 04-26-2013, 07:27 PM

Quote:

Originally Posted by Baer383

I think this thread is funny,talking about MPG in a FI car that's like a super model talking about how she needs weight reduction.

But isnt that a common thing

lol

Z370Z011 · 04-26-2013, 07:28 PM

Quote:

Originally Posted by Chuck33079

Yep. Ethanol is godawful for mileage.

Isn't ethanol cheaper though? Might compensate for the extra gas if its cheaper.

criminalntent · 04-26-2013, 07:39 PM

Turbo size plays a big factor, a smaller turbo will spool higher at cruising speeds and absolutely increase mpg.

03-31-2013, 02:08 AM	#46 (permalink)
Alstann Track Member Join Date: Oct 2011 Location: South Florida Posts: 882 Drives: 12 PW 370z 6MT Sport Rep Power: 15	Considering closed loop maps (i.e. cruising or low throttle), I don't really see a reason why a turbo kit would decrease MPG. The car is just trimming itself to 14.7 AFR, and beyond that, a tune that controlled open loop (WOT) behavior wouldn't really be beneficial, would it? As long as the car is able to steadily maintain it's target stoich. AFR, the turbocharger setup should increase efficiency. Even though they are restrictions, per se. Of course, maybe I'm just speculating. :P TommyL likes this. __________________ 2012 Pearl White 370Z GReddy Twin Turbo

03-31-2013, 08:49 AM	#47 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	I think this thread is funny,talking about MPG in a FI car that's like a super model talking about how she needs weight reduction. Dzel and elperuano like this. __________________ 2013 ZL1 754 rwhp 747 rwtq Last edited by Baer383; 03-31-2013 at 10:37 AM.

03-31-2013, 10:32 AM	#48 (permalink)
MMC Racing Track Member Join Date: Jun 2009 Location: San Diego Posts: 661 Drives: 2015 GT-R Rep Power: 17	On the 350z we had with Vortech, the day to day driving MPG loss was 2. __________________ 2014 F150 Raptor, 2014 Mazda 3, 2015 Nissan GT-R

03-31-2013, 11:39 AM	#49 (permalink)
Dzel A True Z Fanatic Join Date: May 2011 Location: Midland, TX Posts: 3,884 Drives: 11 370Z PW M6 Rep Power: 23	I'll tell you what you guys send me a TT kit and I'll run test for you with chats graphs and even pop up books! Lmao __________________ 10secWS6 IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

03-31-2013, 09:18 PM	#50 (permalink)
esfourteen A True Z Fanatic Join Date: Mar 2010 Location: LI, NY Posts: 1,375 Drives: 40th TT Rep Power: 18	15mpg avg was my last fill up, quite a few 140+mph pulls Dzel, elperuano and Z370Z011 like this. __________________ Build Thread \| GTM TT Install Thread \| Engine Build Thread

04-01-2013, 12:26 PM	#52 (permalink)
elperuano A True Z Fanatic Join Date: Oct 2011 Location: Southwest FL Posts: 1,374 Drives: G37S Rep Power: 29	can't believe people still thinkin that.

04-01-2013, 04:57 PM	#54 (permalink)
elperuano A True Z Fanatic Join Date: Oct 2011 Location: Southwest FL Posts: 1,374 Drives: G37S Rep Power: 29

04-26-2013, 06:51 PM	#55 (permalink)
LafitteZ Track Member Join Date: Jan 2011 Location: lafitte, la Posts: 698 Drives: 40th anniversary Rep Power: 15	my tt370z I run average 30 mpg with my stage 2 setup. Manual light flywheel and clutch greddy turbo tic with down pipes volk 19s with 295/30 and 255/35 unorthodox crank pulley. My twin turbo g37 is horrific on gas. Auto Drive it conservative mabe 20mpg. 20 inch volks down pipes and exaust In the 370 I left new orleans with a full tank then filled up with gas in georgia going to z nats. we was with a bunch of guys so we did a little playing around going up there. had me and my gf and luggage in the car. Last edited by LafitteZ; 04-26-2013 at 06:53 PM.

04-26-2013, 06:56 PM	#56 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	With my driving habits I pretty much get the same fuel economy which is around 22-23 MPG combined. Do you guys think 10% ethanol would drop fuel economy as well? __________________

04-26-2013, 07:39 PM	#60 (permalink)
criminalntent Base Member Join Date: Nov 2012 Location: Louisiana Posts: 15 Drives: M37 Rep Power: 13	Turbo size plays a big factor, a smaller turbo will spool higher at cruising speeds and absolutely increase mpg.