overheating, fuel cutout issues? - Page 2 - Toyota Yaris Forums

mojoyaris · 08-05-2009, 08:17 PM

I'm back after another test run getting it prepped for the Targa.

On long fast runs it's ok. But on short tracks with lots of 2nd to 3rd shiift it's another story.

Stock Thermostat it ran 225 degrees plus. Red line is 210 degrees.
With the new thermostat the water temp stays @ 210, so this is good.
Oil temp is @ 210 and stays pretty cool. So no need at all for oil cooler.

MAF sensor issues etc not really a problem. But what I think it is is the ECU runs the car lean and at VVTI it's not putting in enough fuel after an extended period of driving.

The front end actually gives me alot of air and vents it out through the top of the hood and below. Lots of cold air to the brakes (never had overheating brake issues--- compared to the stock bumper).

Stock bumper will most likely go back on for the Targa with new suspension setup.

Engine has no SC or Turbo, but this may be changed in time for the Targa and hopefully get some more testing in before then. By that time, injectors, and ECU etc will be modified for distance running so the car won't be running in fuel economy mode anymore.
(Piggybacks will also be added).
This may also include getting rid of the Drive by Wire system as well :)

but then again, if Toyota Canada can get me the ride with a stock Yaris, I'll use that instead :)

Geez, motorsports sure isn't cheap.
Some of the guys in Japan have proposed I use the ECU from Japan for the turbo model.
I'm not sure about this, but they'll be sending me info later. We'll have to see what happens.

Thanks for all the input.
If you guys ever come to Japan, check out the Vitz challenge series.

mojoyaris · 08-06-2009, 09:41 PM

The engine is setup to run lean. I think it's the ECU doing it's bit.
after running the car hard, it just runs out of fuel. Kinda like vapour lock.
The car comes back to life. It's like the ECU and the fuel pump is not able to keep up with the flow that is needed when running at VVTI all the time.

jkuchta · 08-07-2009, 04:10 PM

Try water-wetter....I have it in mine, and I've done trackdays WFO in 2nd-4th gears with no problems...I've never seen water temps go above 190 in the track, even after a 25 min. session at the streets of willow spent almost entirely above 5,000rpm.

08-05-2009, 08:17 PM	#1
mojoyaris Ecurie Snoopy Lives View User's Garage Drives: Jojo Join Date: Mar 2007 Location: Vancouver Posts: 447	I'm back after another test run getting it prepped for the Targa. On long fast runs it's ok. But on short tracks with lots of 2nd to 3rd shiift it's another story. Stock Thermostat it ran 225 degrees plus. Red line is 210 degrees. With the new thermostat the water temp stays @ 210, so this is good. Oil temp is @ 210 and stays pretty cool. So no need at all for oil cooler. MAF sensor issues etc not really a problem. But what I think it is is the ECU runs the car lean and at VVTI it's not putting in enough fuel after an extended period of driving. The front end actually gives me alot of air and vents it out through the top of the hood and below. Lots of cold air to the brakes (never had overheating brake issues--- compared to the stock bumper). Stock bumper will most likely go back on for the Targa with new suspension setup. Engine has no SC or Turbo, but this may be changed in time for the Targa and hopefully get some more testing in before then. By that time, injectors, and ECU etc will be modified for distance running so the car won't be running in fuel economy mode anymore. (Piggybacks will also be added). This may also include getting rid of the Drive by Wire system as well :) but then again, if Toyota Canada can get me the ride with a stock Yaris, I'll use that instead :) Geez, motorsports sure isn't cheap. Some of the guys in Japan have proposed I use the ECU from Japan for the turbo model. I'm not sure about this, but they'll be sending me info later. We'll have to see what happens. Thanks for all the input. If you guys ever come to Japan, check out the Vitz challenge series. __________________ Sponsors and Organizations: Toyota Rally Canada Yokohama Tire Canada Western Canada Rally Association Ecurie (Team) Snoopy Canada, racing since 1966

08-06-2009, 09:41 PM	#2
mojoyaris Ecurie Snoopy Lives View User's Garage Drives: Jojo Join Date: Mar 2007 Location: Vancouver Posts: 447	The engine is setup to run lean. I think it's the ECU doing it's bit. after running the car hard, it just runs out of fuel. Kinda like vapour lock. The car comes back to life. It's like the ECU and the fuel pump is not able to keep up with the flow that is needed when running at VVTI all the time. __________________ Sponsors and Organizations: Toyota Rally Canada Yokohama Tire Canada Western Canada Rally Association Ecurie (Team) Snoopy Canada, racing since 1966

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08-07-2009, 04:10 PM	#3
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Try water-wetter....I have it in mine, and I've done trackdays WFO in 2nd-4th gears with no problems...I've never seen water temps go above 190 in the track, even after a 25 min. session at the streets of willow spent almost entirely above 5,000rpm.