07CTS-V

iTrader: (6)

I think it has to do with your tune. My cammed LS2 got the same fuel mileage as it did when it was stock. The extra power allows you to use less pedal to keep the same speed. I think you just need to have it tuned for part throttle.

jasonk

iTrader: (29)

not that it helps one way or another, but I have a cam thats close in size to yours 224/226 with around a 580 lift 114lsa with a maggie and I average (when i am trying to be nice) around 17 in the city, and 25 on the highway. I would think that you should be closer to that, but without knowing much about the tune its tough to tell, perhaps your tuner ran it on the rich side with 42lb injectors? what was a/f on the dyno

also not sure what the temps are out there, but the days that it gets cold here in tampa, i tend to suffer a bit more

FRiCK

iTrader: (7)

Temps haven't been cold lately, 60-70's. I'm putting new 02's (Bosch 13111's corvette rears) fuel filter and 02 sims on tonight, I already have new plugs gapped @ .050" I'm gonna have the tuner throw it back on the rollers and see if anything has changed.

Any suggestions as to what I should tell him or ask him what to look for in the tune?

siggyfreud

iTrader: (1)

If he doesn't know what to look for when you say the MPG is redic head elsewhere.

wcryan

iTrader: (2)

Agree with the above post...... Tuner's should be easily able to adjust power ratio's to the type of MPG you want to get

the owl

iTrader: (2)

If you decide to sell hit me up

wcryan

iTrader: (2)

haha ^

itsslow98

iTrader: (18)

I call Bullshit on people with V1s even bone stock raking in 28mpg. I think people either calculate wrong, or lie there asses off, 28 is vette territory or fbody with a 6 speed and crappy gears.

Frick I get 15 city all of the time and like 21-22 highway. And for whoever said cammed cars arent good for long trips thats BS. The first week I got my cam and long tubes on the car I made a 3 hr trip and got the best gas mileage ive seen in the V 24.6mpg.

I actually gained 1-2mpg city and highway once I got the cam and long tubes.

wcryan

iTrader: (2)

Yeah, to be honest I get around 15-16..... But im not very conservative. And thats stock too

MIAdragon

iTrader: (6)

Heh I was lucky to see that with the maggie....

siggyfreud

iTrader: (1)

FWIW stock I average ~18-19. Includes a good mix of hwy and hwy traffic. On the straight stretches, based on the computer's calculator (as opposed to calculating it on my own) the car gets 24-25mpg at 55-60mph on the hwy. It CAN go higher, but that could be the difference between a slight downgrade or a slight uphill.

JJSimon904

iTrader: (8)

My cam is 236/242 .615/.615. I've got almost 10k miles on the setup since I put it in last August.

I got 30 on the highway when stock. My last trip to Houston (~600 miles round trip in February) with the big cam I got over 25mpg on the tank...made it there in one tank..with a couple of races on the way

OP, you cam'd your car...its going to get worse gas unless you tune for it and/or use less pedal..and yes you should always expect worse gas mileage. Anyone wants to make more power n/a on stock cubes will get worse gas mileage. You can work with the tune to get better gas driving around and it requires a lot of time logging and tuning for several days to/from work if you DD the car. You can't do this on the dyno.

Most of my tanks average 10mpg right now because I sit in an hour of stop and go traffic each way to work and I like to play with the car. I have tanks where I average 16 (like when I filled up today) but it takes a lot of work to do that. I just budget the near $4/gallon for gas. It is worth it My opinion is if you can't afford the little extra cost of the gas money then you shouldn't be modding the car in the first place.


EDIT: I also knew plenty of LS1 fbody guys that saw 31mpg on road trips.

JJSimon904

iTrader: (8)

Just to reiterate, it is impossible to tune for driveability on the dyno espically in 30-40 minutes. The load of the dyno doesn't even begin to simulate real world driving.

STAGEUP

If I say what my mpg is here, I'll be accused of lying.

Let's just say, its all about the tune, and if the tuner actually puts some effort into the drivability portion Of the tune.

SVT F15O

^ ^

FRiCK

iTrader: (7)

He gets 12. Lol

But it's a big *** V10! I wouldn't be complaining at that point... Lol

serik21

by happy my nav screen shows average of 9.3 and i only have exhaust intake and tune amd a lead foot

aurora40

iTrader: (1)

Just FYI, whatever the cam, your engine doesn't use more air to cruise. If it takes say 25hp to overcome air and rolling drag at 60mph, then you only need 25hp worth of air and fuel. With a cam, you aren't making like 30hp instead, otherwise you would speed up. Engines have a throttle that controls the rate of airflow. Cam profiles mainly affect the volume of airflow. More volume of less pressure = the same amount of air.

Certainly overlaps and such can affect fuel efficiency, but saying big cam = big air = big fuel is simplistic beyond being helpful.

To the OP, if you can't solve it, why would you get rid of the car vs just the cam?

greddy91

iTrader: (2)

Stock I pulled 26 mpg from Oklahoma City to Houston - I was actively pursuing gas mileage virtually the entire trip... 2 mpg more isn't that much of a stretch, and perhaps if the majority of a trip were being made at a gentle downgrade 28 seems attainable.

I haven't actively pursued MPG yet in the V post maggie/cam, and with my mileage becoming increasingly more of a value point (also the addition of the 3.90 gears...) on the car I can't see any more 800 mile adventures coming up either... - Likely adding an 04-05 Maxima to the stable soon and that will see the majority of those duties.

dre2013

iTrader: (7)

last roadtrip i avg'd 26mpg all stock (hand calculated). normal avg now is about 19mpg with a decent amt of highway, a little spirited driving, and a 10min warmup every morning.