Fuel Economy with a GTM TT kit!!!

bullitt5897 · 07-13-2011, 08:14 AM

Hey Guys,

As some of you know I bought the TT GTM G37 that I was help selling for a buddy of mine. And I know some of you remember the STI I had purchased before that. Well I sold the STI and bought the G37 mainly for a few facts...

David needed to sell his car quick
The STI had the worse Gas mileage of any car I ever owned!!!

Now when I first bought the G37 TT I figured that the car would be about the same if not a a little better than the STI well I will let you guys judge for yourself if you think TT is bad on Gas mileage:

STI City: 12-16mpg
STI HWY: 14-19mpg

Stock 370z City: 17-19mpg
Stock 370z HWY: 23-27mpg

GTM TT G37 City: 17-25mpg
GTM TT G37 HWY: 27-38mpg

I have been recording my mileage since I bought the car and I will say it is the best and most fuel efficient car I have ever owned. I can set the car to cruise control on the hwy @ 80mph and get 35-38mpg all day long. 55-65mph is even higher!!! Whoever, says going TT will ruin your MPG is full of it!!! I have pictures of my results that I can post if people want me to. I cannot speak for SC'ing your car but if you drive your car normal you can get hypermileage results!

This last 19gal tank of gas should get me around 600miles with combined city and hwy!!!

b1adesofcha0s · 07-13-2011, 08:18 AM

That's insane! I never would have guessed that. It would be cool if you posted pics

Best I've gotten out of my Z was 30.1 mpg driving an hour from VA to MD after getting my exhaust installed.

Econ · 07-13-2011, 08:37 AM

i dont know how you guys get such good gas mileage.

everytime i look at the MPG meeter, and i see it over 20mpg...i know im not having enough fun.

Q8y_drifter · 07-13-2011, 08:50 AM

i can't get my G over 15mpg lol

bullitt5897 · 07-13-2011, 09:01 AM

Hahaha econ!

If I wanted I could make it get 5mpg but that would mean I would be doing 140+mph everywhere! You wouldn't believe how fast a GTM TT kit really is! 70-140+ in 6th gear takes just a few secs!!! The car keeps up with 1000cc motorcycles all day long. I have stomped on corvettes, Mercedes, muscle cars, 600cc bikes and so on... I missed my opportunity the other day to play with a Lamborghini but that's another story.

RCZ · 07-13-2011, 09:31 AM

so bigger injectors/pump and increased power from two turbos = higher fuel mileage, got it.

whaaa?

The only explanation is that you're typing this from the inside of an air tight location while dynoing the white dragon.

GetYourWheels · 07-13-2011, 09:32 AM

Incredible! Keep up the good work!

Nixlimited · 07-13-2011, 09:51 AM

Are these calculations based on the on-board computer, or based on actual fuel-usage figures (e.g. fill up and record mileage and gas usage)? I can see a scenario where the on-board computer would miscalculate gas mileage on the high-end. For example, if the on-board ECU used injector pulse length to calculate fuel use, but you had larger injectors, then when cruising the injector pulse would be shorter because the injector is larger, but you are probably using the same or more gas. I just have a very hard time believing that a TT sports car is rivaling hybrid gas mileage on the freeway.

weiboy718 · 07-13-2011, 10:11 AM

i can barely make 300 miles highway driving only on GTM S/C. about 17-20mpg. can it be our pissy 91 octane robbing us? lol

Billy02987 · 07-13-2011, 10:12 AM

Quote:

Originally Posted by Nixlimited

Are these calculations based on the on-board computer, or based on actual fuel-usage figures (e.g. fill up and record mileage and gas usage)? I can see a scenario where the on-board computer would miscalculate gas mileage on the high-end. For example, if the on-board ECU used injector pulse length to calculate fuel use, but you had larger injectors, then when cruising the injector pulse would be shorter because the injector is larger, but you are probably using the same or more gas. I just have a very hard time believing that a TT sports car is rivaling hybrid gas mileage on the freeway.

I believe it does it exactly that way. I've watched my fuel closely since adding my turbos and it definitely hasn't increased even though the on board computer says different. The larger injectors trick it. I drive mostly highways and am pretty conservative and I normally get 300 miles to the tank now. Here's an example of my gas mileage according to the car. I keep telling people I have a hybrid lol. The last picture is what I was getting before the turbos.

Econ · 07-13-2011, 10:18 AM

i really need to go forced induction asap.

someone loan me like $5k...thats all i need.

GetYourWheels · 07-13-2011, 10:18 AM

Sell a kidney!

ChrisSlicks · 07-13-2011, 10:25 AM

Quote:

Originally Posted by Nixlimited

Are these calculations based on the on-board computer, or based on actual fuel-usage figures (e.g. fill up and record mileage and gas usage)? I can see a scenario where the on-board computer would miscalculate gas mileage on the high-end. For example, if the on-board ECU used injector pulse length to calculate fuel use, but you had larger injectors, then when cruising the injector pulse would be shorter because the injector is larger, but you are probably using the same or more gas. I just have a very hard time believing that a TT sports car is rivaling hybrid gas mileage on the freeway.

Quote:

Originally Posted by Billy02987

I believe it does it exactly that way. I've watched my fuel closely since adding my turbos and it definitely hasn't increased even though the on board computer says different. The larger injectors trick it. I drive mostly highways and am pretty conservative and I normally get 300 miles to the tank now. Here's an example of my gas mileage according to the car. I keep telling people I have a hybrid lol.

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.

esfourteen · 07-13-2011, 10:30 AM

if you're getting 38mpg highway in the Z you are either going down a steep hill or being partially towed.

Econ · 07-13-2011, 10:31 AM

07-13-2011, 08:14 AM	#1 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	Fuel Economy with a GTM TT kit!!! Hey Guys, As some of you know I bought the TT GTM G37 that I was help selling for a buddy of mine. And I know some of you remember the STI I had purchased before that. Well I sold the STI and bought the G37 mainly for a few facts... David needed to sell his car quick The STI had the worse Gas mileage of any car I ever owned!!! Now when I first bought the G37 TT I figured that the car would be about the same if not a a little better than the STI well I will let you guys judge for yourself if you think TT is bad on Gas mileage: STI City: 12-16mpg STI HWY: 14-19mpg Stock 370z City: 17-19mpg Stock 370z HWY: 23-27mpg GTM TT G37 City: 17-25mpg GTM TT G37 HWY: 27-38mpg I have been recording my mileage since I bought the car and I will say it is the best and most fuel efficient car I have ever owned. I can set the car to cruise control on the hwy @ 80mph and get 35-38mpg all day long. 55-65mph is even higher!!! Whoever, says going TT will ruin your MPG is full of it!!! I have pictures of my results that I can post if people want me to. I cannot speak for SC'ing your car but if you drive your car normal you can get hypermileage results! This last 19gal tank of gas should get me around 600miles with combined city and hwy!!! __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 08:18 AM	#2 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 142	That's insane! I never would have guessed that. It would be cool if you posted pics Best I've gotten out of my Z was 30.1 mpg driving an hour from VA to MD after getting my exhaust installed. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

07-13-2011, 08:37 AM	#3 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 20	i dont know how you guys get such good gas mileage. everytime i look at the MPG meeter, and i see it over 20mpg...i know im not having enough fun. __________________ 2014 Triumph Thruxton 900 2013 Fiat 500 Abarth 2009 Nissan 370z

07-13-2011, 08:50 AM	#4 (permalink)
Q8y_drifter Enthusiast Member Join Date: Mar 2010 Location: Kuwait Posts: 306 Drives: 08 Infiniti G35 5AT Rep Power: 16	i can't get my G over 15mpg lol __________________ 08 G35 5AT Sedan \| Stillen CBE \| Invidia HFC \| Injen CAI \| Uprev Tune \| Akebono BBK \| Tanabe Coilovers \| Hotchkis Sway Bars \| GTSpec FSB \| Black Headlights & Grille \| Volk GT-F Wheels \| Hankook V12 Evo Tires

07-13-2011, 09:01 AM	#5 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	Hahaha econ! If I wanted I could make it get 5mpg but that would mean I would be doing 140+mph everywhere! You wouldn't believe how fast a GTM TT kit really is! 70-140+ in 6th gear takes just a few secs!!! The car keeps up with 1000cc motorcycles all day long. I have stomped on corvettes, Mercedes, muscle cars, 600cc bikes and so on... I missed my opportunity the other day to play with a Lamborghini but that's another story. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 09:31 AM	#6 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	so bigger injectors/pump and increased power from two turbos = higher fuel mileage, got it. whaaa? The only explanation is that you're typing this from the inside of an air tight location while dynoing the white dragon. Last edited by RCZ; 07-13-2011 at 10:42 AM.

07-13-2011, 09:32 AM	#7 (permalink)
GetYourWheels A True Z Fanatic Join Date: Feb 2011 Location: Southern California Posts: 3,816 Drives: 2011 BMW M3 Rep Power: 22	Incredible! Keep up the good work! __________________ Email : Eddie@GetYourWheels.com \| Tel: (562)249-7184 \| Your Wheel Fitment Specialist / Wheel & Tire Deal via DM Top Tiers Dealers - Avant-Garde / Forgestar / Rohana / Stance / Vossen + More https://live.staticflickr.com/65535/...de6886f7a7.jpg

07-13-2011, 09:51 AM	#8 (permalink)
Nixlimited A True Z Fanatic Join Date: Aug 2009 Location: San Diego Posts: 1,235 Drives: 15 GT-R / 11 Prius Rep Power: 26	Are these calculations based on the on-board computer, or based on actual fuel-usage figures (e.g. fill up and record mileage and gas usage)? I can see a scenario where the on-board computer would miscalculate gas mileage on the high-end. For example, if the on-board ECU used injector pulse length to calculate fuel use, but you had larger injectors, then when cruising the injector pulse would be shorter because the injector is larger, but you are probably using the same or more gas. I just have a very hard time believing that a TT sports car is rivaling hybrid gas mileage on the freeway. __________________ Car Sold! Pleasure being a part of the Z community. New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)

07-13-2011, 10:11 AM	#9 (permalink)
weiboy718 Track Member Join Date: May 2010 Location: Bay Area Posts: 923 Drives: Infiniti G37 Rep Power: 16	i can barely make 300 miles highway driving only on GTM S/C. about 17-20mpg. can it be our pissy 91 octane robbing us? lol

07-13-2011, 10:18 AM	#11 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 20	i really need to go forced induction asap. someone loan me like $5k...thats all i need. __________________ 2014 Triumph Thruxton 900 2013 Fiat 500 Abarth 2009 Nissan 370z

07-13-2011, 10:18 AM	#12 (permalink)
GetYourWheels A True Z Fanatic Join Date: Feb 2011 Location: Southern California Posts: 3,816 Drives: 2011 BMW M3 Rep Power: 22	Sell a kidney! __________________ Email : Eddie@GetYourWheels.com \| Tel: (562)249-7184 \| Your Wheel Fitment Specialist / Wheel & Tire Deal via DM Top Tiers Dealers - Avant-Garde / Forgestar / Rohana / Stance / Vossen + More https://live.staticflickr.com/65535/...de6886f7a7.jpg

07-13-2011, 10:30 AM	#14 (permalink)
esfourteen A True Z Fanatic Join Date: Mar 2010 Location: LI, NY Posts: 1,375 Drives: 40th TT Rep Power: 19	if you're getting 38mpg highway in the Z you are either going down a steep hill or being partially towed. __________________ Build Thread \| GTM TT Install Thread \| Engine Build Thread

07-13-2011, 10:31 AM	#15 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 20	__________________ 2014 Triumph Thruxton 900 2013 Fiat 500 Abarth 2009 Nissan 370z

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