The "let's brainstorm how to make a piggyback work" thread - Page 5 - Toyota Yaris Forums

eTiMaGo · 03-29-2009, 01:09 PM

LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing

I'm not sure you can get injector info off the OBD bus?

But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble...

largeorangefont · 03-29-2009, 01:23 PM

Quote:

Originally Posted by eTiMaGo

LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing

I'm not sure you can get injector info off the OBD bus?

But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble...

I saw that log, he is going too slow. We need long WOT pulls in a single gear, like you would do on a dyno.

Injector info is there on the OBD, the software just needs to be able to read it.

The problem with adjusting the fuel trim is that the car will readjust it back. The car can adjust fuel trims around +/- 25% before a CEL is thrown. Like I said, I have never really seen one that truly works. The car is constantly learing around your changes.

The rear 02 does nothing in relation to fueling. It is only there to insure the pre cats are functioning.

eTiMaGo · 03-29-2009, 02:04 PM

hmmm i believe those are stored values when you have a CEL, not the dynamic values like you've logged so far...

eTiMaGo · 03-29-2009, 02:14 PM

right right gotcha... well this is way over my head, and I need to get to bed, so I won't be much help

Nexus1155 · 03-29-2009, 09:42 PM

some links i found but im in the process of reading them

http://www.autospeed.com/cms/A_2388/article.html
http://autospeed.com/cms/A_2695/article.html

largeorangefont · 03-29-2009, 09:54 PM

Quote:

Originally Posted by PK198105

LOF i got no engine mods so far and i need a longer straight with no one in front of me to do it safely and properly. ill try and do a run like you said from 2000k and up in each gear.

That would be great. Even seeing what a stock car does will be very helpful. Is there anything on the PID list relating to the fuel injectors?

Your list for that other pull had all the stuff we need, except for injector duty cycle or pulse width.

aucorium · 03-30-2009, 01:57 AM

hey Guys

FYI , i chatted to a few guys with the SMT6 chip here in RSA, and they werent all that happy with the chip and have since changed to UNICHIP , im not sure if this is isolated senario's but just thought i'd give you guys the heads up.Problems reported are fueling and idiling , but like i said , could just be the cars that were tuned , i will keep an eye out for more info.

eTiMaGo · 03-30-2009, 02:40 AM

thanks for the heads up, aucorium...

Today I tested something... As you might know I have a basic AF gauge hooked in to the factory sensor, it's not all that useful, but can show me when the car goes to open loop (in closed loop the AF ratio keeps oscillation rich-lean-rich-lean, as this is the most efficient way for the catalyser to work, wile in open loop the needle stays still). So, leaving the house, I shifted up to third at a rather low speed and put the throttle down. The engine was too low in RPMs to gain any sensible speed, but sure enough, AF needle pegged itself at 14:1 after a second, and stayed there until I let my foot off the gas.

I should have a chance to get on the highway late tonight and repeat the experiment in other gears/conditions, but this is quite promising!

aucorium · 03-30-2009, 04:25 AM

mmm , that seems to show some promise , nice one!! let us know how the test goes.

aucorium · 03-30-2009, 04:53 AM

FYI

i am busy researching us a Dastek Uni - Q chip , apparently this works on the yaris , it worked on my buddies honda fit 1.5 , so im gonna see if i can get a plug and play setup , as the guys here claim to have one for the yaris , i will keep you posted.

here is the chip:

http://www.dastek.co.uk/features_unichip.htm

it can control VVT aswell !

eTiMaGo · 03-31-2009, 01:35 PM

here it is in excel format with in-cell bar graphs to show the relations a bit better

http://dl.getdropbox.com/u/691356/FastRun.xls

lammy29 · 08-17-2011, 03:54 PM

any updates after all these years?

03-29-2009, 01:09 PM	#73
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing I'm not sure you can get injector info off the OBD bus? But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble... __________________ 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...

03-29-2009, 02:04 PM	#75
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	hmmm i believe those are stored values when you have a CEL, not the dynamic values like you've logged so far... __________________ 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...

03-29-2009, 02:14 PM	#76
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	right right gotcha... well this is way over my head, and I need to get to bed, so I won't be much help __________________ 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...

03-30-2009, 01:57 AM	#79
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	hey Guys FYI , i chatted to a few guys with the SMT6 chip here in RSA, and they werent all that happy with the chip and have since changed to UNICHIP , im not sure if this is isolated senario's but just thought i'd give you guys the heads up.Problems reported are fueling and idiling , but like i said , could just be the cars that were tuned , i will keep an eye out for more info. __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

03-30-2009, 02:40 AM	#80
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	thanks for the heads up, aucorium... Today I tested something... As you might know I have a basic AF gauge hooked in to the factory sensor, it's not all that useful, but can show me when the car goes to open loop (in closed loop the AF ratio keeps oscillation rich-lean-rich-lean, as this is the most efficient way for the catalyser to work, wile in open loop the needle stays still). So, leaving the house, I shifted up to third at a rather low speed and put the throttle down. The engine was too low in RPMs to gain any sensible speed, but sure enough, AF needle pegged itself at 14:1 after a second, and stayed there until I let my foot off the gas. I should have a chance to get on the highway late tonight and repeat the experiment in other gears/conditions, but this is quite promising! __________________ 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...

03-29-2009, 09:42 PM	#77
Nexus1155 Bathroom + Laptop = <3 Drives: Audi Join Date: Aug 2006 Location: Dorchester Posts: 1,009	some links i found but im in the process of reading them http://www.autospeed.com/cms/A_2388/article.html http://autospeed.com/cms/A_2695/article.html

03-30-2009, 04:25 AM	#81
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	mmm , that seems to show some promise , nice one!! let us know how the test goes. __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

03-30-2009, 04:53 AM	#82
aucorium AKA Samurai Racer Drives: Yaris 2006 Join Date: Jul 2006 Location: South Africa Posts: 834	FYI i am busy researching us a Dastek Uni - Q chip , apparently this works on the yaris , it worked on my buddies honda fit 1.5 , so im gonna see if i can get a plug and play setup , as the guys here claim to have one for the yaris , i will keep you posted. here is the chip: http://www.dastek.co.uk/features_unichip.htm it can control VVT aswell ! __________________ JDMtuner Import Performance Tuning www.jdmtuner.co.za

03-31-2009, 01:35 PM	#83
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	here it is in excel format with in-cell bar graphs to show the relations a bit better http://dl.getdropbox.com/u/691356/FastRun.xls __________________ 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...

08-17-2011, 03:54 PM	#84
lammy29 Drives: Yaris Join Date: Oct 2008 Location: Nottingham, UK Posts: 237	any updates after all these years?