Where's the fun in that? ;)

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.

Found it....This was with FI on the car. It went down after to around 34 after it was all said and done.
Don't mind the engine light...cats were burnt up.

:icon18:
Brother, that gauge isn't accurate once you change out the fuel injectors...


But if you have a conservative tune, a Turbo kit WILL add efficiency...

:iagree:

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

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.:rofl2:

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

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

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

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.

:icon14: can't believe people still thinkin that.

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

:facepalm:

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.

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?

Yep. Ethanol is godawful for mileage.

But isnt that a common thing :ugh2: lol

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

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

Maybe, but you need to go bigger on the fuel system for ethanol. It's a trade off. E85 is good stuff if it's readily available around you. He was asking about E10, and that's hard to avoid.

Ethanol has a much lower energy content than gasoline (~115k BTU/lb for gasoline vs ~70k BTU/lb for ethanol). So ethanol will always hurt your fuel economy.

That being said, you can make more power on ethanol (~105-110 octane), but you need to at least tune for it and ideally build (higher compression) for it and you will likely flow 30% more fuel to make equal power.

Ethanol is a great big ripoff for consumers. It's government subsidized despite it being an inferior and less efficient fuel. It does have a higher effective octane, but when you go to the pump and buy gas cut with 10% ethanol, like in CA, you are basically buying watered down gas, which will impact your mileage.

Good point. No wonder during the 6 years of ownership with the 350Z at some point the car stopped feeling as peppy and a full tank didn't last as long. Around that time not all pumps were required to put the 10% ethanol notice. It's everywhere, and it's not really saving us much money. [END RANT]

Coming back from Z days I was getting 23 mpg,I happen to notice when refilling.

I have been getting similar fuel economy while on my 1k mile trip. I have gotten 22, 20, and 21 MPG on the 3 tanks of 93 I used to get from Fontana, NC to Lawton, OK. Unfortunately, Lawton only sells 91 octane........ouch. my trip back to Killeen, TX should be interesting for the first tank of fuel.

Sent from my SGH-T889 using Tapatalk 2

I just ran my first full tank of 93 (boosting heavily) and I got 18.7 mpg.

Just wait until the day you fill up on Friday afternoon and then on Saturday, then see what your MPG is. I think I got it down to 9MPG. :driving: