60 MPG Toyota Yaris

[ltwargssf]

[QUOTE=redneck;665445]��

Why...???

I run my exhaust heated intake year round. The hotter the air the better. Your computer will pull the fuel back to the correct air fuel ratio. Cooler air contains more oxygen thus more fuel will be needed to keep the correct ratio.

Is your mpg in Imperial or U.S. ?


Yes, the Scan gauge is set to US MPG, the stock L/100km gauge I average around 4.8-5L/100KM with my mix city/highway commutes but I can get it lower.


Temperatures have risen here and I have put back my "cold air pipe" that feeds air from the fender so I get ambient temperature IATs. With the higher temperatures, there were days my car would see 60-70 degree with my winter intake and with my summer intake, they don't go over 30 which definitely improve power delivery. I'm also getting the same MPG with 30-40deg colder IATs so I don't mind switching the intakes after winter since it is not needed.

[ltwargssf]

Originally Posted by Phase

how do you keep the under tray in play or insert it? im looking to make one for my car too. no idea how to clip it out

For most of the front part, I was at my local scrap yard and picked up a whole bunch of plastic screw anchors that are on every toyota fender covers. For the rear covers, there were factory holes near and on the subframe which I simply tapped some threads into and had my bolt placements. I will take more pictures when I get back under there to finish the center of the floors where I will most likely build a small metal frame to attach the last sheets. The rear section is almost completely flat now other than about 12 inches where the muffler is.


Another big plus for these covers is road noise reduction and the engine bay/body being protected from the elements. When I first got the car, a lot of small clamps and bolts in the engine compartment were showing signs of rust and that wasn't surprising since you could pretty much see the ground and all the salt would just get on everything. With the covers in place and everything rust proofed, this car should last me a very long time.

[ltwargssf]

Originally Posted by Vman455

This is not necessarily true; current eco-cars use cool, high pressure intake air routed from in front of the radiator (Honda Insight, Toyota Prius, etc.).

After seeing these intakes at the Chicago Auto Show, I decided to try ducting my intake to the front of the car in 2020:



I verified that intake air temperature had been reduced by monitoring it on the Scangauge.

Statistical analysis (hypothesis testing--compares sample data to the normal distribution to determine if there is enough evidence to claim a population parameter has changed) of the fuel consumption for the 6 months previous (Jan-June) compared to the 6 months after (July-Dec) showed that consumption had been reduced, from an average 4.49 L/100 km to 4.09 L/100 km.

Those scoops may give you cooler IAT's but my goal with making my intake was to avoid hydro locking the engine. I made a pipe from the intake box to the inside of the drive side fender where it goes up and picks up air from behind the headlight. It gets me IAT's similar to ambient air so a scoop is really over kill and more risks of hydrolcking in the rain.

[ltwargssf]

Finished up the floors today, hopefully, il be able to hit the 60mpg goal, I will report after a few fill-ups.

[ltwargssf]

Update*

Driven about 1500km since the covers and I've been having a hard time crossing the 50mpg average mark, unfortunately. Sure I can hypermiling and at 70km/h cruising in 5th I get 62mpg but on average I'm having trouble crossing the 50mpg. I am happy to be able to maintain 45mpg+ without issues and at 100km/h I am at 48-49mpg. Summer is coming so hopping with the higher temperature, my average can go up.

[Phase]

Originally Posted by ltwargssf

Update*

Driven about 1500km since the covers and I've been having a hard time crossing the 50mpg average mark, unfortunately. Sure I can hypermiling and at 70km/h cruising in 5th I get 62mpg but on average I'm having trouble crossing the 50mpg. I am happy to be able to maintain 45mpg+ without issues and at 100km/h I am at 48-49mpg. Summer is coming so hopping with the higher temperature, my average can go up.

So no improvement?

[ltwargssf]

Originally Posted by Phase

So no improvement?

Well the only addition was the floor pans, most of the advantages seem to come from the front and rear undertray.
I would say now it's a bit more consistent at holding 48-49mpg at 100km/h compared to before.
The handling is still amazing, we had record 90km/h winds and I did a 150km highway trip, barely had any counter-steering to do. I saw another stock yaris and poor guy looked like he was drunk, wind was blowing him all over the place.

[ltwargssf]

Went back under today and put a final cover over the entire thing. I put some heat reflective where the exhaust is but it really doesn't get too hot on this small engine so I'm not worried.

Also fabricated some air curtains that feed air from the fog lights.

[Phase]

Originally Posted by ltwargssf

Went back under today and put a final cover over the entire thing. I put some heat reflective where the exhaust is but it really doesn't get too hot on this small engine so I'm not worried.

Also fabricated some air curtains that feed air from the fog lights.

what material did you use for the under tray?

[freebeard]

Whatever it is has lots of fender washers.