Fuel Economy with a GTM TT kit!!!

Kirkster · 07-14-2011, 08:38 PM

Quote:

Originally Posted by weiboy718

ya! but then i'm not making any positive boost. not sure if that matters much on the S/C app. still a little disappointed in my fuel mileage. 220 is what i'm making on highway and local driving combined out of a full tank lol

gas price in San Francisco is around $4.17 for 91 octane btw lol.

wow...

combined local and highway I am getting ~19mpg and that is with quite a bit of getting on it..

I generally see 330 out of a tank without sucking it dry...

weiboy718 · 07-14-2011, 08:43 PM

Quote:

Originally Posted by Kirkster

wow...

combined local and highway I am getting ~19mpg and that is with quite a bit of getting on it..

I generally see 330 out of a tank without sucking it dry...

man! somethings not right with my car lol. it's sucking wayyyyy too much gas and i'm not even getting on it.

Kirkster · 07-14-2011, 08:51 PM

I am getting 24mpg pure highway 65~70 mph driving...

ChrisSlicks · 07-14-2011, 09:07 PM

I get 6 mpg.

RCZ · 07-14-2011, 09:10 PM

I'm getting around 15...20 if Im super careful.

EVOHUNTER · 07-20-2011, 04:37 PM

After i installed my stillen kit i filled my car up, said i had 765 kms tell empty which i ussually only get like 380 to tank so i thought that was od.. i started thinking i messed up the level sensor when i installed the fuel pump. And also my tank would never read full, like ever.. i filled it up, it read full which surprised me, ive got 435 kms on this taknk with 2 dots left. im wondering if i did mess up my level sensor? Im using the trip function and not the milage left gauge. Ive been really easy on the car lately, i guess if your not pumping in boost u shouldnt be using anymore gas then before it was FI?

theDreamer · 07-20-2011, 04:41 PM

Quote:

Originally Posted by ChrisSlicks

Exactly this. The trip computer is estimating fuel economy based on "stock" injector pulse width, the trip computer numbers are meaningless.

Fill to fill measuring the number of gallon you put in the tank by the number of miles driven is the only accurate measurement.

EVOHUNTER, read the above quote, should explain what is going on.
I get between 15-20 depending on how I am driving (mostly city with some open highway). Lately I have been getting up on the highway more, but those on ramps are just asking for it.

DIGItonium · 07-24-2011, 04:53 PM

My car reports around 22.3 MPG average, and calculated to 21.7 MPG after yesterday's fill up. This is mostly city and some freeway driving to work and around town. So each week I accumulate under 230 mi., and it takes a little over 10 gallons to fill up. All N/A so far of course.

Jeffblue · 08-05-2011, 01:11 PM

Quote:

Originally Posted by Bullitt@UAMotorsports

Guys I am doing my figures from pumping gas (I filled up 19 gal yesterday and drove 300+miles so far and I still havent reached 1/2 tank) and I am using info from the trip computer. both are correlating really closely maybe off by 1-2 mpg... still it does not negate the fact that at an increased hp level the car is under less strain to hold a given rpm...

for example:

maintaining 75mph in 6th gear stock required about 30+% throttle position...
maintaining 75mph in 6th gear TT'd required about 22% throttle position...

I am seeing an increase in motor efficiency and can sustain higher rpm's with less throttle input. Therefore, the motor is able to get higher fuel economy.

mike

btw rcz... I have been driving a TT G37 for 2 months now

ok none of this makes any sense. First of all how would you actually make it to the gas station with a totally empty tank. Which would have to be the case in order for you to actually fill it with 19 gallons of gas. second, i have no idea why you would run a car with 600whp and an aftermarket turbo kit and built motor and all that stuff with almost no gas in the car, that is just asking for trouble. Third, unless you got a different transmission, your gearing would be exactly the same as ours, and therefore you wouldn't have any reason to be getting better fuel economy. All things being equal, same RPM at the same speed, but with a larger displacement motor and a ton more horsepower, it defies ALL reasoning that your car could possibly get better gas mileage than a stock 370z.

Turbochargers, and any FI system, coupled with larger injectors produces more power by allowing the car to burn MORE air and fuel in the cylinder. You stroked your motor too, allowing it to burn even MORE air and fuel at the same time, producing more power. So burning more air and fuel at the same time means better efficiency?

Your car has more power than any stock 370z because it can burn more air and fuel in a given revolution than a stock vq37. More air and fuel burnt in a given revolution=worse fuel economy.

Just because your motor doesn't have to strain to make the same horsepower as a stock motor, doesn't mean it is more efficient. If a 6ft 300lb Powerlifter can more easily deadlift 500lbs than a 5ft tall 175lb power lifter. However, when they are both walking around the 300lb guy burns more calories to do any activity just because he has a higher metabolism and more mass. Granted, engines aren't people, but its the same principle.

I also don't see the point in making a false statement about increased fuel economy on a high horsepower car. The correct answer to 'how many MPG's do you get?' in your high horsepower, modified car, is 'I don't give a shit.'

Rui Z · 08-05-2011, 01:23 PM

^^He's talking about his G37 car.

Plus there's so many factors that go into mpg that we really shouldn't care too much about it when it comes to TTing a car.

Jeffblue · 08-05-2011, 01:29 PM

Quote:

Originally Posted by Rui Z

^^He's talking about his G37 car.

Plus there's so many factors that go into mpg that we really shouldn't care too much about it when it comes to TTing a car.

Oh sorry, i thought he was talking about the Z. Either way, same point.

bullitt5897 · 08-05-2011, 01:31 PM

Your confusing my cars...

This was in reference to the G37 TT I bought which by my logs on paper has been getting 27-33MPG shared mileage. And btw the car holds a 20 gal tank of gas.

Jeffblue · 08-05-2011, 01:34 PM

Quote:

Originally Posted by Bullitt@UAMotorsports

Your confusing my cars...

This was in reference to the G37 TT I bought which by my logs on paper has been getting 27-33MPG shared mileage. And btw the car holds a 20 gal tank of gas.

ok either way. Why would you run an aftermarket turbo car down to the empty light. its asking for trouble.

are you under boost or vacuum while cruising?

bullitt5897 · 08-05-2011, 01:43 PM

the power lifter is a bad analogy...

lets look at it this way...

you have a N/A car it makes 300hp then you add ram air system... now it makes 315hp on the same tune... the car uses the same amount of fuel on both applications one just makes more power. Acceleration is now faster meaning getting up to desired speed takes less time so your burn duration is shorter. You are able to use less throttle to maintain that speed even if it is just a small amount...

I am just writing down what the car is getting for mileage... I have driven Hi HP cars for a while now and understand you dont need to flaunt it 24/7 when driving! I find that I can still get great gas mileage with them. Others dont always get similar results because they floor it all the time. SC'ers will get worse mileage than a TT because your always in boost...

bullitt5897 · 08-05-2011, 01:45 PM

Quote:

Originally Posted by Jeffblue

ok either way. Why would you run an aftermarket turbo car down to the empty light. its asking for trouble.

are you under boost or vacuum while cruising?

its hard to gauge how much fuel is left cause the gauge drops like a rock and at that point I am babying it like crazy to make a gas station. I am at 3k rpm when I am cruising I will take a snap shot of the boost controller next time I am cruising.

Mike

07-14-2011, 08:51 PM	#63 (permalink)
Kirkster A True Z Fanatic Join Date: Dec 2008 Location: Peoples Republic of MD Posts: 1,792 Drives: Roadster of DOOM Rep Power: 19	I am getting 24mpg pure highway 65~70 mph driving... __________________ Powertrain Warranty voided on 5/14/2011 Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara For eastwest:

07-14-2011, 09:07 PM	#64 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	I get 6 mpg. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

07-24-2011, 04:53 PM	#68 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	My car reports around 22.3 MPG average, and calculated to 21.7 MPG after yesterday's fill up. This is mostly city and some freeway driving to work and around town. So each week I accumulate under 230 mi., and it takes a little over 10 gallons to fill up. All N/A so far of course. __________________

08-05-2011, 01:23 PM	#70 (permalink)
Rui Z Track Member Join Date: Feb 2010 Location: (.)(.) Posts: 931 Drives: 8====D Rep Power: 16	^^He's talking about his G37 car. Plus there's so many factors that go into mpg that we really shouldn't care too much about it when it comes to TTing a car. __________________

08-05-2011, 01:31 PM	#72 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	Your confusing my cars... This was in reference to the G37 TT I bought which by my logs on paper has been getting 27-33MPG shared mileage. And btw the car holds a 20 gal tank of gas. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-14-2011, 09:10 PM	#65 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	I'm getting around 15...20 if Im super careful.

07-20-2011, 04:37 PM	#66 (permalink)
EVOHUNTER Track Member Join Date: Jul 2011 Location: Edmonton, Canada Posts: 681 Drives: BOOSTED3-7-0 Rep Power: 14	After i installed my stillen kit i filled my car up, said i had 765 kms tell empty which i ussually only get like 380 to tank so i thought that was od.. i started thinking i messed up the level sensor when i installed the fuel pump. And also my tank would never read full, like ever.. i filled it up, it read full which surprised me, ive got 435 kms on this taknk with 2 dots left. im wondering if i did mess up my level sensor? Im using the trip function and not the milage left gauge. Ive been really easy on the car lately, i guess if your not pumping in boost u shouldnt be using anymore gas then before it was FI?

08-05-2011, 01:43 PM	#74 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	the power lifter is a bad analogy... lets look at it this way... you have a N/A car it makes 300hp then you add ram air system... now it makes 315hp on the same tune... the car uses the same amount of fuel on both applications one just makes more power. Acceleration is now faster meaning getting up to desired speed takes less time so your burn duration is shorter. You are able to use less throttle to maintain that speed even if it is just a small amount... I am just writing down what the car is getting for mileage... I have driven Hi HP cars for a while now and understand you dont need to flaunt it 24/7 when driving! I find that I can still get great gas mileage with them. Others dont always get similar results because they floor it all the time. SC'ers will get worse mileage than a TT because your always in boost... __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

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