Sorry if this is a stupid quesiton but im new to evos and new to turbo'd cars. Now i know if i run the car at WOT its obviously going to eat up the gas, my car is tuned at 16lbs now but i was wandering if i got it tuned for 20lbs, how much worse would the gas mileage be?? (i do alot of highway driving and i normaly run in 5th gear and just cruise only hitting maybe 1 or 2 lbs or none at all, if i moved it to 20 is that still going to suck more gas?)



thanks to anyone who responds

 

lol not trying to be mean but if you stay out of boost does not matter what its tuned to. stay around 1 or 2 psi while driving like a sane person or highway driving and you will have Excellent gas milage period. kind of common sense take it easy and the evo will take it easy on your wallet

 

why is the car tuned at 16 lbs in the first place? that's lower than from the factory

unless you aer boosting it doesn't make a difference what your boost is set at as far as gas mileage is concerned

 

i know that, but i do have spirited driving moments and want some more power but how much more gas is it going to eat from 16-20

 

Anytime you're in boost your car will consume more fuel, and the more boost you run the more fuel your car will need to keep it safe. As stated though, regardless of if you run 16psi or 36psi your vehicle will use no more or less fuel than normal when not in boost.

 

the factory tune should be set to either 19-20 psi. thats from the dealer. so you need to get your tune readjusted thats one. as i stated does not matter long as your out of boost 1 or 2 psi is not going to matter you will have great gas milage 26 on hwy or so. its what i was getting. if your driving hard then you need more gas to push more psi blah blah blah etc so therefore you will be fueling up sooner. so if money is tight right now might i suggest driving like a N/A car. if you just got paid or track nights do what you have to do for the W... just be ready to fill up on the way home

 

If you're talking about spirited driving (so not just freeway cruising) I would say that it is going to eat more gas. How about this though.. What sort of gas mileage do you get on average right now? 22 combined? I honestly don't think it'll affect it that much unless you are a crazy driver.

I was tuned on 21 psi, with a full TBE and I was still getting about 18-21 mpg on average (about even city and freeway driving, with plenty of spirited driving).

And btw... Might want to try not wandering so much, can cause traffic problems... Stick to wondering about things instead

 

sell your evo and get a prius.

have your car tuned properly, and when youre not looking to have a spirited drive, stay out of boost.

 

hahah sorry bout that im a bad speller.


alright i understand how it works now, the guy before me was a complete dumbass, ive had so many problems with this car already, and im just trying to get everything fixed

 

Haha, it's no big, I just have to pretend to be spelling police once in awhile.

Get it all fixed up and it'll be a wonderful car. 16 psi is horrible for an Evo. And I promise your gas mileage won't go down enough for you to care, especially not enough to be a bigger con than the pro of going fast

 

i dont know about that hommie. my evo had a boost leak and i could only net a steady constant 15psi i knew this by a the dealer doing a boost leak test and after i install a boost guage. I was having plenty of fun. Mellon told me i was 4 psi off and i found my crappy megan manifold was on car when i bought it was cracked there my leak. so im redoing my whole longblock but i did not know any better and the only evo i have riden/driven is my own so 15 psi was balling. Man i cant imagine hows its going to feel at 30psi with no leaks.

 

well
your gas mileage really depends on how you drive
20 psi definitely eat more fuel compare to 16psi
as there are more air suck into the motor
more fuel are needed in order to keep the AFR not too lean
and obviously
more air force into the engine result in burning of more fuel
which means less mileage for you when u are spirited driving
however, if u are doing highway miles
it shouldnt matter much

 

I was running 15 psi due to a faulty factory solenoid... Put a MBC on and bypassed the solenoid... cranked up to 21 with nothing else... Trust me, it made a huge difference. Hell, the 2 psi change (roughly) across the board on my STi made a huge difference in how the car felt. I remember asking and someone said that you can assume a very rough guess of about 5-7 whp per psi. Not sure how accurate that was as I never tested it, but it has to be a decent gain if everyone is questing to boost more and more.

Oh wait, I remember, I do have a semi-test of that theory.

Totally stock baseline 206 whp, Mustang dyno.
Threw on full catless TBE, solenoid happened to break around this time too, 207 whp, same dyno and settings. (except for boosting to a peak 15 with taper to 12)
Turned boost up to 21 with MBC and got a fairly average quality tune: 276 whp same dyno and settings.

Now the total numbers don't matter, since all dynos are different, but since I got a baseline and redyno'd each time the same way on the same dyno, you can get at least a decent idea of the gains (or losses).