Fuel Economy with a GTM TT kit!!!

GetYourWheels · 07-13-2011, 11:48 AM

Mr.Squeeze · 07-13-2011, 12:18 PM

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.

You are 100 % correct the bigger injectors trick the stock ECU.

Kirkster · 07-13-2011, 12:36 PM

Quote:

Originally Posted by Mr.Squeeze

You are 100 % correct the bigger injectors trick the stock ECU.

Yep. Now we just need to figure out how to fix that...

Econ · 07-13-2011, 12:37 PM

interesting

bullitt5897 · 07-13-2011, 12:52 PM

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

bullitt5897 · 07-13-2011, 12:59 PM

btw at 75mph i am just under 3k rpm and barely touching the gas maybe 6% throttle... The mileage to empty jumps around on me so I am not using that as my basis... After 200miles yesterday it went from 395 to empty up to 495 back to 450 and so on depending on my driving. Also I believe the trip computer is taking calculations at 1 mile increments and comparing the avg fuel consumption to give you the est. range. If i lay into it for a quarter mile the range doesnt change until a mile or two later and if I am coasting it doesnt change either.

Mike

wheee! · 07-13-2011, 01:02 PM

hmmmm.... I wonder if the wife will buy this logic! lol

... honey, the twin turbos are actually saving us money...!

bullitt5897 · 07-13-2011, 01:04 PM

Quote:

Originally Posted by wheee!

hmmmm.... I wonder if the wife will buy this logic! lol

... honey, the twin turbos are actually saving us money...!

lol my wife to be is all over it haha but her nickname at work is Turbo cause she loves turbo cars hehehehe

Kirkster · 07-13-2011, 01:06 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

Quote:

Originally Posted by Bullitt@UAMotorsports

btw at 75mph i am just under 3k rpm and barely touching the gas maybe 6% throttle... The mileage to empty jumps around on me so I am not using that as my basis... After 200miles yesterday it went from 395 to empty up to 495 back to 450 and so on depending on my driving. Also I believe the trip computer is taking calculations at 1 mile increments and comparing the avg fuel consumption to give you the est. range. If i lay into it for a quarter mile the range doesnt change until a mile or two later and if I am coasting it doesnt change either.

Mike

If a TT got better gas milage than a stock motor everyone would put one in...

Must be that new math they are teaching in school...

bullitt5897 · 07-13-2011, 01:43 PM

Hey everyone said me and Semtex were applying ricer math when we quoted his exhaust, HFC combo on hp.... guess what we were right! My math is on target... I have been getting 500+ miles on a tank of gas when i drive it normal...

500/19=26mpg

550/19=28.9mpg

600/19=31.5mpg

so with my avg's being around 26-31 combined I should be right on target.

SharpByCoop · 07-13-2011, 02:03 PM

I have the same car/combination (essentially). I have to side with Bullitt, although I understand and won't completely trust the onboard computer (which reads around 29-27 mpg on cruise.) It just sips fuel when I'm not stepping into it.

That said, probably because of exhaust flow (no cats, straight out), the car is effortless at 70mph.

The new math: Having my cake and eating it, too.

Coop

bullitt5897 · 07-13-2011, 02:07 PM

ricer math FTMFW!!! hehehe

ChrisSlicks · 07-13-2011, 02:17 PM

Turbocharged engines are generally considered to be more efficient than an NA motor of similar or slightly lesser HP level, but I've never heard of adding a turbo system to a car making it more efficient, although if the compression ratio is reduced then I guess it is theoretically possible.

RCZ · 07-13-2011, 02:36 PM

Come on guys...the idea behind saving fuel with a turbo engine is that you can produce same power with LESS cylinders or LESS displacement when compared to another engine. Bullitt, could you please explain why the car is more fuel efficient now?

pty370z · 07-13-2011, 02:42 PM

It's not like GTM needed more advertising to sell their S/C and TT systems.. hahahaha..

- Do you have a Z or a G?
- Are you having sucky gas mileage?
- The answer to your problem is Twin-Turbo!

IT WILL PAY FOR ITSELF WITH SAVINGS!

07-13-2011, 11:48 AM	#16 (permalink)
GetYourWheels A True Z Fanatic Join Date: Feb 2011 Location: Southern California Posts: 3,816 Drives: 2011 BMW M3 Rep Power: 21	__________________ 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, 12:37 PM	#19 (permalink)
Econ A True Z Fanatic Join Date: Jan 2011 Location: New York City Posts: 2,546 Drives: Fiat? Rep Power: 19	interesting __________________ 2014 Triumph Thruxton 900 2013 Fiat 500 Abarth 2009 Nissan 370z

07-13-2011, 12:52 PM	#20 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	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 __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 12:59 PM	#21 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	btw at 75mph i am just under 3k rpm and barely touching the gas maybe 6% throttle... The mileage to empty jumps around on me so I am not using that as my basis... After 200miles yesterday it went from 395 to empty up to 495 back to 450 and so on depending on my driving. Also I believe the trip computer is taking calculations at 1 mile increments and comparing the avg fuel consumption to give you the est. range. If i lay into it for a quarter mile the range doesnt change until a mile or two later and if I am coasting it doesnt change either. Mike __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 01:02 PM	#22 (permalink)
wheee! A True Z Fanatic Join Date: Sep 2009 Location: Mod Capital of Canada Age: 58 Posts: 7,354 Drives: cars. lots of cars. Rep Power: 40182	hmmmm.... I wonder if the wife will buy this logic! lol ... honey, the twin turbos are actually saving us money...! __________________ H&R / Stillen / Berk / HKS / Swift / Michelin / UpRev / SPC / Amuse Rep / Seibon / Fringe XVO / TWM / more... My Journal

07-13-2011, 01:43 PM	#25 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	Hey everyone said me and Semtex were applying ricer math when we quoted his exhaust, HFC combo on hp.... guess what we were right! My math is on target... I have been getting 500+ miles on a tank of gas when i drive it normal... 500/19=26mpg 550/19=28.9mpg 600/19=31.5mpg so with my avg's being around 26-31 combined I should be right on target. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 02:03 PM	#26 (permalink)
SharpByCoop Enthusiast Member Join Date: Sep 2010 Location: Connecticut Posts: 286 Drives: '08 G37S - Graphite Rep Power: 15	I have the same car/combination (essentially). I have to side with Bullitt, although I understand and won't completely trust the onboard computer (which reads around 29-27 mpg on cruise.) It just sips fuel when I'm not stepping into it. That said, probably because of exhaust flow (no cats, straight out), the car is effortless at 70mph. The new math: Having my cake and eating it, too. Coop __________________ Jim Cooper - (Retired: '08 Infiniti G37 Sport • TheShopCT built • 11.13 @ 123 mph (click for vid) • GTM Stage II Twin Turbo • 5-speed A/T Level Ten built • 591whp @17 lbs boost)

07-13-2011, 02:07 PM	#27 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	ricer math FTMFW!!! hehehe __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

07-13-2011, 02:17 PM	#28 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Turbocharged engines are generally considered to be more efficient than an NA motor of similar or slightly lesser HP level, but I've never heard of adding a turbo system to a car making it more efficient, although if the compression ratio is reduced then I guess it is theoretically possible. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

07-13-2011, 02:36 PM	#29 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	Come on guys...the idea behind saving fuel with a turbo engine is that you can produce same power with LESS cylinders or LESS displacement when compared to another engine. Bullitt, could you please explain why the car is more fuel efficient now?

07-13-2011, 02:42 PM	#30 (permalink)
pty370z Track Member Join Date: Apr 2009 Location: Panama City, Panama Posts: 654 Drives: over the speed limit Rep Power: 17	It's not like GTM needed more advertising to sell their S/C and TT systems.. hahahaha.. - Do you have a Z or a G? - Are you having sucky gas mileage? - The answer to your problem is Twin-Turbo! IT WILL PAY FOR ITSELF WITH SAVINGS! __________________ 2010 Solid Red 370Z * *Touring-Sport-6MT Black Interior Performance:** STILLEN * BERK * UR * MISHIMOTO * K&N * Z1 * ZSPEED * UPREV * DBA Interior: GT-R Red Start/Stop Button * MSA Floor Mats * PW:JDM Exterior: INGS+1 * SEIBON * FUJIMURA * PW:JDM * UAM * KICS * VOLK

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