916LS1

iTrader: (4)

Is this normal? I used to go about 200 miles on a tank in the city, but after the cam swap, I'm finding that I can only go about 120 miles on one tank. And this is AFTER the tune (put down 388rwhp). Does this mean that my tuner sucks?

N4cer

iTrader: (11)

Just depends on the car, but WOW. I got 200 with my old 224 setup with huge heads that were too big. In fact, I still get more than you are with my current setup. But sometimes cars are just weird. Mine only got 20-22mpg stock, when everyone else was claiming 25-28.

SS4Matt

iTrader: (4)

all the performance stuff i've ever done to my car always got me better MPG it seemed, intil i threw in my 60# injectors, those killed my MPG, but hell when i used to have one of my old setups with my old TR224 cam, i always got pretty good gas mileage....could be a tuning issue, it could just be you putting down the loud pedal every chance you get when i used to DD my car i would get good mileage, now that it's just my nice day cruiser, i get horrible MPG cause i have my foot in it whenever i take it out...my self control went out the window.

BriancWS6

iTrader: (18)

Going to bigger injectors will only lower your mileage if they weren't tuned properly and your dumping in excess fuel. The point in installing larger injectors isn't to give the car more fuel at all times, but to give it the abilty to supply the proper amount of fuel when needed, where stock size would have ran lean.

Ferocity02

iTrader: (60)

My 224 also killed my gas mileage. I guess it's just the nature of aftermarket cams.

00slowredz

i think you're right, however also think it has a lot to do with the weight of the persons foot. ya get a cam, you drive harder so you enjoy it

916LS1

iTrader: (4)

I DO have quite the lead foot, especially after the cam. My tuner did say that my edelbrock shorties weren't "tuned length" so they are making the computer vary in AFR at lower RPMs.

Oh4GTO

iTrader: (46)

Tr224 gave me about 12.3 MPG. No highway driving. Just cruising aroung 55 - 60 with a few lights. With the MS4 and heads Im getting better mileage..........14.2MPG..........thats what Im talkin about.

Grimes

iTrader: (3)

I think some of you have tuning issues, and/or a heavy right foot!

SS4Matt

iTrader: (4)

yeah i needed bigger injectors because the stockers weren't cutting it, and thus once the new ones went in, my afr was back to it's happy point and thus dumping more fuel in when i drove around with my foot to the floor, which is...well...all the time

ringram

Cam overlap will ensure fuel gets thrown down the exhaust without ever seeing spark too. Are you running the 112 LSA?

Michael02hawk

iTrader: (26)

I'm getting about 225 miles on my take of gas, with the TR224 and my whole 383 setup.

But that can be less depending on my lead foot for the week. :-)

Studytime

iTrader: (15)

A 224/224 is not a big cam and should not annihilate your economy. I think like Grimes said you're enjoying the new power too much.

Ben T.

The Dragon

iTrader: (6)

Something is wrong with your set-up/tune. Eliminate any mechanical issues you may have first; fueling leaks etc.

Unless you're driving EVERYWHERE at WOT . . . something is wrong.

I get ~165 miles on a tank ALL CITY driving on my set-up; which is rather extreme compared to yours.

I drive at no less than 3K RPM'S and a VERY heavy foot in the city (I don't need to drive that high, I just choose to ).

That "untuned length" is a suspect statement . . . if everything is mechanically sound, find another tuner IMO.

Good luck.

SSippi

iTrader: (2)

When the fun factor goes up the fuel economy goes down. I get anywhere from 18 to 22mpg with some city and highway and with 4.10's driving conservatively. Try keeping your shifts below 2.5k and 3k rpms. When I really have fun my fuel economy is in the 14 to 16mpg!

99blancoSS

iTrader: (115)

I had a TR224. Yes you lose gas mileage due to the foot factor. I could get either around 120 miles per tank or 280 depending on how I drove. If the a/f is good then its not the tune

The Alchemist

iTrader: (19)

With my TR224 (112lsa), heads, long tubes, 3.73s, I still get 210-230 miles per tank of gas and it takes roughly 15 gallons to refill, so I'm getting between 14 and 16 mpg and that's all backroads, stop and go. Granted, it's a 'fun driver' only so when I do drive it I'm gassing it pretty hard.

On your tune, did he do just a WOT dyno tune, because if so, your mid throttle, low rpm tune may be off pretty bad and your running extremely rich. Doing a 'drivability' tune is just as important as a WOT dyno tune.

davered00ss

iTrader: (4)

My gas milage is the same as before the cam.

GuitsBoy

iTrader: (4)

My city mileage has always sucked and has gotten worse with mods.

My highway milage however has stayed almost the same. I still get 25 MPG highway with mods in sig.

SmaknaSS

iTrader: (1)

In my old car my gas mileage went up a bit but on that car I zero'ed in my L-trims using the old IFR and MAF transfer funtion methode no VE.