50 mpg or bust. - Toyota Yaris Forums

ecoterror · 02-20-2014, 06:57 PM

My favorite hobby is road racing racing, Ive had two cars so far that I got very competitive with, an 04 srt4 with over 16k into it, including a home made front splitter, underbody tray, and rear diffuser, I am very good at making a areo package work, now i run a 91 GSX eclipse, which as of yet I havent built a kit for it, but it is in the works.
So then I opened the hood of the car for real this time. Installed a braille lightweight racing battery I had left over, 11lbs saving over the 35 series stock battery. i removed the air box and cut out the charcoal filter lid, and ran a custom cold air intake to the bottom of the box, that helped a bit, I got about 1mpg i would guess from the box modding and battery. This will soon be replaced with a trd intake I scored from a trade-in the other day, so Im looking forward to the gains I will have from that when installed on my next oil change. (I only mod the car at the begining of every oil change to eliminate variables.) Then the rear motor mount, which is pathetic from the factory needed work, so I broke out a polyurathane cutting board and a cutoff wheel, cut the board into two small pieces and drilled out most of the rubber, if you press the two pieces that you cut semi accurately... into the remaining mount you get a fairly solid mount, at almost no cost, and anything that cuts the slop out of the drivetrain will increase the mpg.
I had had the car for about 3 months at this point, so i hooked it up to my techstream and pulled the fuel trims, to my shock and elation my LT fuel trims had lowered to -15.6%, real number results that my little car was being as miserly as it could with the petrol. Although I was still only getting 38 mpg which to me is nowhere near what i should have it.
enter my first areo mod.
As we all probably know, the stock engine covers are hilariously bad, too small to even make a difference. So i went to my trusty imagination again to find a cheap fix. Then it fell into my lap, a customer had tore their underbody shield off of a 2010 sienna, part #58167-08010. this piece is in fact WAY bigger than the whole front end of a yaris. So I broke out the cutting wheel and went to town triming it to clear the tires, once it fit i used the OEM clips and screws to hold the front of it to the bumper, drilled some holes in the rear subframe and used 4 steel screws to hold it in place. it extends from the front bumper to past the subframe, basically perfect as an underbody plate.
The difference of the plate was nice, it made the road noise a bit quieter, made Key On Engine Off cruising run well over my previous records. Driving at 80 for long trips became a breeze.
which settled me right in at 41mpg while driving like a normal person, no actual eco driving, which is how i am most of the time.

once agian, let me know what you think, this car is fantastic for what it is and i love modding it.

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02-20-2014, 06:57 PM	#2
ecoterror Drives: 08 yaris Join Date: Feb 2014 Location: akron Posts: 6	My favorite hobby is road racing racing, Ive had two cars so far that I got very competitive with, an 04 srt4 with over 16k into it, including a home made front splitter, underbody tray, and rear diffuser, I am very good at making a areo package work, now i run a 91 GSX eclipse, which as of yet I havent built a kit for it, but it is in the works. So then I opened the hood of the car for real this time. Installed a braille lightweight racing battery I had left over, 11lbs saving over the 35 series stock battery. i removed the air box and cut out the charcoal filter lid, and ran a custom cold air intake to the bottom of the box, that helped a bit, I got about 1mpg i would guess from the box modding and battery. This will soon be replaced with a trd intake I scored from a trade-in the other day, so Im looking forward to the gains I will have from that when installed on my next oil change. (I only mod the car at the begining of every oil change to eliminate variables.) Then the rear motor mount, which is pathetic from the factory needed work, so I broke out a polyurathane cutting board and a cutoff wheel, cut the board into two small pieces and drilled out most of the rubber, if you press the two pieces that you cut semi accurately... into the remaining mount you get a fairly solid mount, at almost no cost, and anything that cuts the slop out of the drivetrain will increase the mpg. I had had the car for about 3 months at this point, so i hooked it up to my techstream and pulled the fuel trims, to my shock and elation my LT fuel trims had lowered to -15.6%, real number results that my little car was being as miserly as it could with the petrol. Although I was still only getting 38 mpg which to me is nowhere near what i should have it. enter my first areo mod. As we all probably know, the stock engine covers are hilariously bad, too small to even make a difference. So i went to my trusty imagination again to find a cheap fix. Then it fell into my lap, a customer had tore their underbody shield off of a 2010 sienna, part #58167-08010. this piece is in fact WAY bigger than the whole front end of a yaris. So I broke out the cutting wheel and went to town triming it to clear the tires, once it fit i used the OEM clips and screws to hold the front of it to the bumper, drilled some holes in the rear subframe and used 4 steel screws to hold it in place. it extends from the front bumper to past the subframe, basically perfect as an underbody plate. The difference of the plate was nice, it made the road noise a bit quieter, made Key On Engine Off cruising run well over my previous records. Driving at 80 for long trips became a breeze. which settled me right in at 41mpg while driving like a normal person, no actual eco driving, which is how i am most of the time. once agian, let me know what you think, this car is fantastic for what it is and i love modding it.