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Thread: Performance related mods that help with fuel efficiency?

  1. #11
    FST Junkie! G heinrich's Avatar
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    I've got all the stage 3 bolt ons and an intake. Running a 91 OTS tune (fill with 93). I believe I've averaged 42 miles per gallon according to the cars trip odometer on the highway.but I drive like an ass usually so it's around 26-27.

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    Quote Originally Posted by rob99rt View Post
    Forgot about wheels and tires... I am looking at replacing the stock 18s with some 17s once the F1s are worn out. Had to get a tire patched 2 days ago and the poor tire guy had a bear of a time with the tire due to that lip and the short sidewall. I imagine the taller sidewall of the 17s will help a bit with the ride harshness, too, as the roads around Denver suck.
    tires and wheel package of a 17 can be heavy compared to a 18. the more sidewall the more rubber the more weight

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    Leave it alone! ("performance wise") if you want to keep that 32+ MPG DON'T touch it. NOTHING you do will help... bolt ons and a tune will get you less MPG NOT more.

    You could run meth injection, but then you have to fill a tank with an added cost but you will for sure get better MPG. return on investment will be bad LOL. if you plan to keep the car for 10+ years then it will pay for itself.

    light 18" wheels and light weight tires will be the only help you can get

    if you really want 17" then go for it but you just keep in mind that the package will likely be heavier. most 17" wheels are less than a lb lighter than the 18" but the tires are more than a couple lbs.

    return on investment will be bad for anything you do. if you want rims then get them, if you want rims to get better MPG... well that is silly because you are going to spend $1000 on rims and gain .5 mpg better at most and it will take you years to see the return at the pump , $1000 is a LOT OF GAS


    You bought the wrong car to want good MPG

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    If you're already getting 32+ mpg on the highway, you shouldn't expect much more. That's a hell of a lot better than 98% of the people on here, no matter how we drive. But more power to you (I guess not literally) if you can find a few ways to increase it.

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    Quote Originally Posted by nickbaldwin86 View Post
    return on investment will be bad for anything you do. if you want rims then get them, if you want rims to get better MPG... well that is silly because you are going to spend $1000 on rims and gain .5 mpg better at most and it will take you years to see the return at the pump , $1000 is a LOT OF GAS


    You bought the wrong car to want good MPG
    I agree with this... spending money on performance mods to save on fuel is going to take forever to recoup the investment. You can do some free/cheap things like make sure you have no unnecessary weight in the car, tires are properly inflated (or slightly above) and then just pay attention to your driving habits. Read up on the driver mods on hyper-miling forums.

    If you need new tires and are willing to sacrifice some grip, look at low rolling resistance tires/eco friendly models. You can also get away with running a 225.40x18 (oem winter RS size.) Also, if you can improve your car's aero, it would help cut through the air (although being a mile high, i would execpt slightly less resistance already,) again check out the hypermilling forums for what they are doing.
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    FST Junkie! nickbaldwin86's Avatar
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    Quote Originally Posted by rambleon84 View Post
    I agree with this... spending money on performance mods to save on fuel is going to take forever to recoup the investment. You can do some free/cheap things like make sure you have no unnecessary weight in the car, tires are properly inflated (or slightly above) and then just pay attention to your driving habits. Read up on the driver mods on hyper-miling forums.

    If you need new tires and are willing to sacrifice some grip, look at low rolling resistance tires/eco friendly models. You can also get away with running a 225.40x18 (oem winter RS size.) Also, if you can improve your car's aero, it would help cut through the air (although being a mile high, i would execpt slightly less resistance already,) again check out the hypermilling forums for what they are doing.
    Narrow less grippy tires are a great thought... just say no to corning the car ever again...
    Totally agree to what you are saying, but....
    hypermilling these cars sounds like death to the ecoboost... the motor shouldn't be lugged and if you blow up a motor it will cost way more money then any money you saved at the pump, to save a penny you spent a dollar to replace a motor.

    again High MPG is not what this car was built for... just my thoughts

    Sounds like you spent a lot of money on a "sports car" to make it into a Prius, and drive it like one.

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    Quote Originally Posted by nickbaldwin86 View Post
    Narrow less grippy tires are a great thought... just say no to corning the car ever again...
    Totally agree to what you are saying, but....
    hypermilling these cars sounds like death to the ecoboost... the motor shouldn't be lugged and if you blow up a motor it will cost way more money then any money you saved at the pump, to save a penny you spent a dollar to replace a motor.

    again High MPG is not what this car was built for... just my thoughts

    Sounds like you spent a lot of money on a "sports car" to make it into a Prius, and drive it like one.
    How about Dr Jekyll/mr hyde? Boring hypermiler during the weekly commute and then can still get into it on the weekends.
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    Quote Originally Posted by rambleon84 View Post
    How about Dr Jekyll/mr hyde? Boring hypermiler during the weekly commute and then can still get into it on the weekends.
    I just got a daily. 97 Rav4. runs smooth as butter on cheap 87 petrol and gets better mileage than my ST. yea same. going to be boring all week, but I will save my miles on the ST for the weekends

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    Quote Originally Posted by nickbaldwin86 View Post
    Narrow less grippy tires are a great thought... just say no to corning the car ever again...
    Totally agree to what you are saying, but....
    hypermilling these cars sounds like death to the ecoboost... the motor shouldn't be lugged and if you blow up a motor it will cost way more money then any money you saved at the pump, to save a penny you spent a dollar to replace a motor.

    again High MPG is not what this car was built for... just my thoughts

    Sounds like you spent a lot of money on a "sports car" to make it into a Prius, and drive it like one.
    I bought it for a few reasons... Ecoboost fan for several years now (Transit with 3.5 EB, Escape with the 2.0 EB)... and since there's a fair amount of parts commonality between the Escape and Focus, I went that route since it seemed like a good fit for what I wanted (better mileage than Escape, better acceleration). I did NOT want a N/A car for around here... at an altitude of 5K I wanted a turbo/super-charged car for the increased efficiency of filling the cylinders as well as the benefits of get-up-and-go when I need it. I don't lug it, but I don't hammer on it much either. It makes enough torque to get it moving just fine from a light without needing to get into boost much, and I'm still usually the first person down the road by several car lengths. I realize the car wasn't built for high mpg... I didn't buy it to get 40+ back and forth to work. However, *IF* I can bump it up a little bit and get more power/acceleration when I want it, then I will. I can't seem to leave anything alone and will tweak/work on/fiddle with just about everything I own to make it better one way or another, and this car isn't any different.

    If I can figure out a way to up the efficiency of the engine, since after all it's really nothing more than an air pump, then mpg will subsequently increase. Typically, if you can figure out a way to more easily get air and in and out of the engine, it'll make more power, too. If I can figure out a way to decrease the spinning mass at the corners, that will help as well. How much stuff like airflow mods will change the mileage I've yet to quantify, but the car should react positively to anything that frees up air flow in and out of the engine. Might be a little or might be a lot.. just don't know yet.
    Last edited by rob99rt; 07-08-2019 at 01:41 PM.

  11. #20
    FST Member rob99rt's Avatar
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    Quote Originally Posted by rambleon84 View Post
    How about Dr Jekyll/mr hyde? Boring hypermiler during the weekly commute and then can still get into it on the weekends.
    That's basically what I had with that 99 Neon RT I used to own and am hoping to somewhat replicate here. That thing had a lopey idle due to the cams and was tons of fun to drive due to its acceleration and cornering abilities, and yet it gave me 41 mpg on the highway when I kept my foot out of it. I think from the factory is was rated at 33 mpg. Best time I ever turned with it was [email protected] mph at National Trails, and that was with wheelhop through 3rd gear. I'm sure a better driver could have knocked a few tenths off of that and picked up a couple mph, too. 0-60, though, was not that car's strong suit due to traction limitations, even with the lsd I'd put in it. The ST is much easier to get to 60 quickly.

    ETA: so I had to take a drive about 70 miles North which was a 400 foot elevation change, and since we were hauling a dog I had to turn on the AC (which I never use). The mileage for the tank was way down compared to normal... 29.6. Still not awful, but the speed (cruise at 77-78) and AC definitely killed it. Looks like driving the 45-50 mph route to work is the way to save on fuel right now.
    Last edited by rob99rt; 07-08-2019 at 08:40 PM.
    - Rob


 

 
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