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10-08-2011, 05:17 AM | #1 |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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5 cents performance mod
Hi everyone!
Anybody seen this article?: http://www.autospeed.com/cms/A_11035...popularArticle Fooling the ECM into thinking that air temperature is lower than it is actually is. Is it doable to our Yaris? or anybody tried this? Thanks! |
10-08-2011, 05:55 AM | #2 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
Posts: 7,744
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Doable? Yes.
Effective? Remains to be proven...
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10-08-2011, 08:08 AM | #3 |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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i want to try it, any idea which wire is for the intake air temperature?
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10-08-2011, 08:16 AM | #4 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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u should do a dyno before and after to see actual results.
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10-08-2011, 09:00 AM | #5 |
Drives: 2005 Toyota Echo Join Date: Aug 2010
Location: Brampton, ON
Posts: 505
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It's debateable, some ECU's won't advance the timing and only add fuel with a colder IAT reading, but some like the Insight will do both.
That being said, running 11.5-12.0 AFR is too rich, especially when it used to run 12.0-12.5... but heck getting 5 degrees more timing ain't half bad (assuming the knock sensor doesn't kick in).
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2006 Saturn Ion Redline 2005 Toyota Echo RS 4dr hatch - Cyl #3 bad - sold 2000 Toyota Echo 2dr coupe - The track car - rusty & scrapped |
10-08-2011, 09:14 AM | #6 |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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my yaris has not seen a dyno ever since I owned it!
anyway, I think the result can be seen if one has a scangauge II / OBDII and the thing to watch is the air/fuel ratio (I may be wrong on this) . if the ECM is fooled by thinking it is getting a cooler air, it may allow a richer air fuel mix. theoretically, a liitle more fuel will give a little more power. our yaris have a knock sensor, I think that will prevent any predetonation in case I have too much fuel in. now, i have two problems: 1. I do not have the A/F gauges to see the results, i may have to rely on driver's instinct on this. 2. still I do not know which wire should i insert the variable resistor. |
10-08-2011, 09:21 AM | #7 | |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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Quote:
only one way to find out... |
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10-08-2011, 11:07 AM | #8 | |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Quote:
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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10-08-2011, 11:19 AM | #9 |
Drives: 1nz-fe Join Date: Apr 2009
Location: SoCal
Posts: 4
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Oxygen Sensor output will still determine the A/F ratio. Lower airtemp reading may allow ECU to advance timing a little bit though.
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10-08-2011, 02:04 PM | #10 |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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guys, i really appreciate your responses. thank you very much!
so this is what i got so far: 1. it is doable (provided i know which wire is for the temperature sensor) 2. if my current AFR is 14.7:1(stoichiometric), getting it down to 12:1 should be fine. less than 12:1 will be too rich. too rich and i will not benefit and lose power instead. (unfortunately, i do not have any gadget to measure / get the ECU reading, all i know, my engine is still completely stock) 3. if i was able to fool the ECU to advance the timing, i might get more power from using same amount of air with a little extra fuel. and still i am stuck on item 1... |
10-08-2011, 02:37 PM | #11 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
Posts: 7,744
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To be honest, the Yaris ECU already runs pretty rich. When driving normally it keeps at stoichiometric for best performance and emissions, and when you put your foot down, the ECU goes into open loop mode and is mapped quite rich (presumably to prevent any overheating problems, or detonation due to bad fuel, only Toyota engineers can answer this). It is highly unlikely that more fuel will give any power, quite the contrary it might be beneficial to lean things out a bit, but so far I believe nobody has any hard numbers on this.
As for your item 1, go look at www.etimago.com/yaris/repairmanual , the "engine control" file should show you the wires at the MAF/IAT sensor. For item 3, I did some testing for another member not long ago with my scangauge showing the timing advance value, at full throttle: http://dl.dropbox.com/u/1600280/Car%...-05-31_425.mp4 It's a big file, sorry :p But you can see the advance reaching about 39 degrees. Might have gotten higher if I could have kept on going, I am not sure. Anyway I am not saying it's a waste of time to do these kinds of mods, but don't expect magical results, and try to document and measure as much as you can :)
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The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ... |
10-09-2011, 12:20 AM | #12 |
Drives: Blazin' Blue 2007 Yaris LB Join Date: Sep 2011
Location: Fort Campbell, KY
Posts: 110
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Its definetly something to look into and document, let us know the results if you do mess around (:
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10-09-2011, 08:36 PM | #13 |
Drives: 2005 Toyota Echo Join Date: Aug 2010
Location: Brampton, ON
Posts: 505
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Not if it goes into open loop during WOT and determines fueling off a pre-defined table in the ECU instead of reading the sensor.
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2006 Saturn Ion Redline 2005 Toyota Echo RS 4dr hatch - Cyl #3 bad - sold 2000 Toyota Echo 2dr coupe - The track car - rusty & scrapped |
10-17-2011, 04:08 PM | #14 |
Drives: 2006 Yaris HB 5DR Join Date: Oct 2008
Location: Jubail, KSA
Posts: 105
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@eTiMaGo
Thanks, I check the manual and only had to time to read it today. Found the intake air temperature sensor explanation on page ES-97, simplified schematics on ES-99 and ground wire on MAF(orange-colored) on EWD page 87. Thanks also for sharing your test, I’m having second thoughts now. @Viperoni and Reactor Found some info about A/F sensor on page ES-76 and heated O2 sensor on ES-126. Still not clear to me what will happen and how much adjustment this two sensor will do as compared to the adjustment of the ECM from IAT chnages. I already bought a cheap OBD2 scanner on ebay, hoping to receive it in two weeks time. I will do some initial data gathering before deciding to proceed or not. |
12-02-2011, 12:21 PM | #15 |
My Face Is Ridiculous
Drives: 2010 Toyota Yaris 3dr LB Join Date: Dec 2011
Location: Scott, LA
Posts: 456
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they sell cheap resistors on eBay that do the same thing...it will make your car run rich and stink like fuel. trust me.
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12-02-2011, 12:45 PM | #16 |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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^ Correct. For ten minutes, then the ECU makes the adjustment. No gain.
Here is my article on the subject: http://www.microimageonline.com/foru...act-or-Fiction
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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