Sudden drop in fuel economy on ecoboost
11-05-2014, 02:55 PM
#11
Member
It has been reported repeatedly in the forum that intakes have almost no benefit as Ford already plucked that low hanging fruit. And anything bigger than 3" on an exhaust can reduce low-end torque.
However, last February, I was getting the lowest MPG I've ever experienced (brutal winter), but switched from Gulf 87 to Mobil 93 and gained about 2 mpg, so winter gas, brand of gas and octane can have effects.
However, last February, I was getting the lowest MPG I've ever experienced (brutal winter), but switched from Gulf 87 to Mobil 93 and gained about 2 mpg, so winter gas, brand of gas and octane can have effects.
11-05-2014, 04:49 PM
#14
Senior Member
11-05-2014, 05:24 PM
#15
Disconnect the battery for 15 minutes and let it relearn your driving style.
11-06-2014, 08:49 AM
#16
Senior Member/Vietnam Vet
I stand by my statement. For just tooling around under light throttle, we are not in boost and are naturally aspirated. If you give it more and activate boost, then you get more low-end and less MPG.
My fifth wheel is 9500 lbs and I went with a 3" Full Race exhaust for that reason. If Full Race says 3" is good for up to 600 HP, that is good enough for me.
My fifth wheel is 9500 lbs and I went with a 3" Full Race exhaust for that reason. If Full Race says 3" is good for up to 600 HP, that is good enough for me.
Last edited by SkiSmuggs; 11-06-2014 at 02:29 PM.
11-06-2014, 06:29 PM
#17
Senior Member
11-07-2014, 09:22 AM
#18
The ecoboost vehicles do not make enough power to out flow 3" pipe. 3" pipe can flow 813cfm +- a few. You can count 2-2.2 cfm per 1hp. So a 400rwhp na engine will require 813+-cfm exhaust, however, a good bit of that exhaust is used to spin the turbos so the eb setup will not require that. So, you still have all of the flow you need in the upper rpm range but do not have any of the torque loss down low from larger exhaust.
11-07-2014, 09:55 AM
#19
Senior Member
The ecoboost vehicles do not make enough power to out flow 3" pipe. 3" pipe can flow 813cfm +- a few. You can count 2-2.2 cfm per 1hp. So a 400rwhp na engine will require 813+-cfm exhaust, however, a good bit of that exhaust is used to spin the turbos so the eb setup will not require that. So, you still have all of the flow you need in the upper rpm range but do not have any of the torque loss down low from larger exhaust.
11-07-2014, 10:04 AM
#20
Extreme DIY Homeowner
