2014 LE hatchback

[RWJC]

Originally Posted by ern-diz

I'm not a big fan of chrome on these cars, but your wheels look sharp.

Thank you!

[RWJC]

Originally Posted by LTHatch

What size MAF tube did you get? Possibly i am mistaken but did you say you bought a new MAF? From the threads on here, too large a MAF tube will throw a code, that's possibly what's causing yours.

OK, had a 1/2" x1/2" reducer ring, inserted into the MAF tube, butted up against the sensor, disconnect NEG for 3 min, start & idle for 5 min, and then drive. Floored it 3 times...no CEL. Thanks Hatch!!!

WAY more pull, not supercharger, but much improved!

[RWJC]

ok, not so quick, now the CEL is on, but the Trac off light did not come on, so there is an improvement. Going to pull the code in the morning..maybe a little more reduction around the MAF

UPDATE: put a smaller cone filter, no CEL as yet, and went short ram (sri). still have hp gains..trying to figure out mpg vs speed and gain/loss..

[RWJC]

Originally Posted by RWJC

UPDATE: put a smaller cone filter, no CEL as yet, and went short ram (sri). still have hp gains..trying to figure out mpg vs speed and gain/loss..

As of today, CEL & TRAC Off are both on even with smaller cone filter. The new MAF sensor still emits a code. Based on research, will take a thick 2" OD hose and stick inside the 3"OD pipe where the MAF sensor is to mimic the exact size original OEM Air box. Will test that today.

[LTHatch]

Definitely keep us updated, if the smaller MAF hose doesn't fix it someone else might have different ideas to getting your Yaris running right,

[RWJC]

Originally Posted by LTHatch

Definitely keep us updated, if the smaller MAF hose doesn't fix it someone else might have different ideas to getting your Yaris running right,

Well, went a different route...put the OEM setup from intake hose to airbox back on. The OEM filter needed to be replaced, so I cut the entire center out. put the MAF back in the OEM housing. Ran my 3" flex hose from the bottom of the OEM box, back under to behind the front driver fog light. I used the large cone to let more air into the system.

Drove 50 miles.

1) Check engine light NEVER came on.
2) Does not sound as good.
3) Lost the HP gain I had.
4) Unsure of MPG effects.

SO if anyone who has 17" rims or larger with a STOCK intake, can post their MPG @:
25-
45-
55-
70-

I would be appreciative. Also, specify city & state you are in. I will run like this for 2-3 days, and record my MPG at those speeds. Then compare.

If no Issues, I will try to locate a 2" or 2.5" MSF aftermarket tube.

[mr_miles]

I get 38 to 45 mpg with my rotiforms on. they're 17x8. they're also really frigging heavy which does not help lol.

[RWJC]

had an idea...i looked at the OEM airbox where the MAF sits, took measurements, and then too PVC 2" coupling. I foil taped the PVC to protect it and make it more aerodynamic. Inserted it into the MAF 3" housing and reduced it to the OEM 2" measurement. After I drilled the PVC to allow the MAF to sit in the tube, retaped and reconnected. Start was rough, but the computer calibrated and idled very smoothly, better than the OEM box oddly enough. Went and drove 15 miles, but waited till the very end before I floored it. No lights...

As you can tell, I cant stand to have a problem unsolved.

[haunter1982]

what code was saved?

I think you got too much air, motor runs leaner, you got more power, but on reving, your enging gots too lean -> Error.

[RWJC]

UPDATE:

bought a CAI on Amazon that is 2.5" and the MAF sensor never tripped. It seems so far at 100mi the ECU seems to be learning the new intake. Sounds really good with the resonating tip. Got several compliments on it today. it causes the Air filter to sit right behind the front bumper on the driver side.

MPG seems to have improved drastically of the 3" tube. looks like HP seems to have dropped somewhat, but I'll take the better MPG. If I want HP, I'll get a supercharger. LOLz

Loving the traction on the wheels/tire package. I'll continue to post updates as they happen.