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What MPG are you getting after going F.I.
Out of curiosity, I was wondering what everyones MPG is like after going F.I.
Given that your not at WOT all the time, post what Your average MPG numbers, and what type of F.I kit you have :driving: EDIT: I know when going F.I. MPG isn't a priority (obviously lol) Just thought it would be interesting to see everyones numbers. :tiphat: |
I average around 21-23 highway usually. It isn't too bad when you stay out of boost...but where's the fun in that? :driving:
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If you drive with a light foot, you could actually see an increase. I remember seeing a guy on here who was getting 30+ on the HWY at 70-75. Its all gonna depend on how you drive, obviously with the larger injectors and fuel pump, if you are heavy on the throttle you will see a decrease. However like I said above if your driving patterns do not change, you will get an improvement because it takes less input of the throttle to achieve the same thing.. Hope this helps.
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The 30+ was not real, he was using the digital screen on the left which is unable to change when you alter the injector size/flow.
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My daily driving of my SC car I Get 18MPG but that is some highway & some traffic plus the usual fun areas. Freeway I can get into the low 20s which is nice with how big Houston is. |
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Thanks, Alex Goodwin AlexG@motionlabtuning.com |
Hopefully this thread doesn't turn into another "30-40" mpg.
No one is getting that kind of mileage on a TT Z. Best mileage I got was around 20-21 mpg all highway drivin from Miami to Orlando. Light boost, tried to keep out of boost but there were times I got into it. |
I hate it when sponsors make untrue comments to sell stuff. There is no way in hell that MPG is going up after FI. You are adding additional weight to the front of the car and dumping more fuel. At best, you will come close to your original MPG. That is if you ONLY drive conservatively and NEVER hit boost.
If any shop or tuner believe any stories from their customer that their MPG jumped up after FI, then I question the integrity and the technical knowledge of the shop. |
I still think it is possible to get slightly better fuel consumption with a light foot and FI. My reason being that this system is going to be fine tuned for the injectors and fuel pump in the car. With that being said who really cares when you have FI lol
Sent from my SGH-T889V using Tapatalk 2 |
Turbo's help the motor exhale and breath. All else being equal, cruising MPG should go up. BUT, part throttle and WOT get so much worse that it more than makes up for the extra you get while cruising.
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And turbos doesnt necessarily help the car inhale better either. At cruising speeds, the turbos are not spun fast enough to create boost. The engine is running in vacuum. |
The only way that turbos increase MPG is by decreasing the engine size. Car manufactures use turbos in the cars to create the same amount of horsepower with a smaller displacement engine.
For example, BMW 335 uses twin turbos to enable a 3.0 liter engine to output around 300bhp. Without turbos, the same engine would probably require a 3.5 liter to make the same power. At idle and cruising, a 3.0 liter engine will use less gas compared to the 3.5, therefore you "increase MPG by turbos". However, slapping on turbos on the same engine with same displacement will NOT increase MPG. |
Well said sir.
This is why I hope it doesn't go in that direction. Everything said has been said in past threads also. Lets just stick to stating MPG... If anyone throws in a high number we can all have a nice laugh. |
I see about 18-18.5 mpg in normal driving. As far as turbos increasing mpg, you may see a little increase in fuel economy driving around in vacuum if the tune is leaner than a stock Z. Once you put your foot into it, all mpg gains go right out the window.
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Pumping losses.
Out of boost, the engine runs at lower efficiency. Unless the engine in question has absolutely horrible scavenging at small throttle openings/low RPM (hint: ours doesn't have poor scavenging) you will pretty much never see an uptick in fuel efficiency. |
lol no fighting you guys!.. hopefully everyone can post some sincere MPG numbers :driving:
of course MPG doesnt matter much when boosting a car, but its interesting to see what MPG numbers everyone is hitting :) |
I've done 3 cross country trips with my GTM twin turbo G37. Averaging 70-75 miles per hour with very little boost, I get about 24 MPG.
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I hope you see a pattern of what actual turbo owners are telling you versus those that are trying to sell you a turbo.
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In stop and go traffic, I get 12-13.5 MPG driving around Killeen/Fort Hood. It is a more or less slinky effect.
On the highway, that is a whole different situation. I have never filled more than 18.1 gallons and I have driven about 500 miles each time I take it down to 1 dot or less. If I use the fuel that you get on base, forget about it. The car might not even start, lol. |
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I sense a regret going FI thread brewing :stirthepot:
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my friend had a 600hp evo that he let me drive once... ive been wanting to go FI ever since :happydance: lol |
Absolutely no regrets. The OP asked for MPG feedback and the fact is it will go down. If you want to know if i regret FI? nahhhhhhhhhhhhhh no way.
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I don't measure my Miles Per Gallon...
That's because I'm too absorbed with my Smiles Per Gallon. Priceless. :tup: Coop |
Well, the 2004 Tahoe I am driving gets the same type of fuel economy. It weighs 6200lbs makes about 300hp and has 22" Bigg wheels on it. It supposedly has a 25 gallon fuel tank as well. I have never put more than 20 gallons in it and have never gone more than 400 miles on a single tank.
Now about regret..............the only thing I regret is having to leave my car @ UPREV while waiting on my new radiator AND having to drive the dang-on Tahoe for 3 weeks. I love my Greddy TT Kit, F.I. TT-TDX, 34 Row OC, and my gauge setup. The only thing I don't like is the idiots in Hondas sounding like bees or the random 1999-2005 Mustang Cobra that pull up beside me and try to impress me with their throttle blips. I did cave in once and downshift (SRM off) from 3rd (about 30MPH) to second and gave him a taste of open WG dump throttle blip. I saw what looked to be a gasp, surpise (wide open eyes), head snapped in my direction, and a quick jerk of the steering wheel. I laughed all the way to base! |
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Turbos absolutely increase the efficiency of the motor which will in turn increase economy when driven conservatively. Supercharger set-ups actually add parasitic drag onto the engine from spinning the blower. This is why they do not see as great of increase in economy regardless of driving style.
Thanks, Alex Goodwin AlexG@motionlabtuning.com |
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A 34-35MPG is almost 30% increase over the factory rating which have been posted to be fairly accurate at 27MPG. I understand turbos added create certain increases in economy but you also have the tune which plays a large factor. I doubt you sent the car home with an economy tune trying to maximize MPG. |
I track my gas mileage on an app (Gas Cubby) so after I get my TT back, I will share actual empirical results with people. I have a year of tracked gas mileage in stock form (based on gallons in and odometer) that I can use as the baseline.
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My car is not a daily driver so even when I wasn't FI I still didn't check the mpg I just drive it and fill it up same as now.:tup:
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