tC injectors cured my lean condition

[LtNoogie]

I installed a set of tC injectors today to see how they would affect my AFR under WOT boost. Shortly after installing them, I drove around to see if idle and low throttle would be affected. I threw CELs twice for a rich condition.

P0101 - Mass Air Flow (MAF) Circuit Range/Performance Problem
P0172 - System Too Rich (Bank 1)

After clearing the codes both times, the codes never came back. I'm guessing that the ECU eventually learned how to cut back on the fuel to keep the A/F mixture stoich.

First video is of a freeway acceleration with the S/C turned off. I tried to go WOT but there was too much traffic. Even at near WOT, the AFR stayed at stoich and timing was well advanced. The video is not as clear as I'd like and I need to find out if it is the screen capture program or Windows Movie Maker.

http://www.youtube.com/watch?v=ohEyY0FAM2U

Second video is a WOT acceleration with 7lb boost. I used to read a 14.7 AFR while doing this, which many said was bad for the engine. In this video AFR bottoms out at 12.03 on the data logger. On my wideband gauge, the reading is 10.5 or something close. Lean condition is gone when the car goes into open-loop acceleration. While maintaining speed, sometimes the boost levels are from 1-3lbs and put the car into open-loop. You see max rich condition there too.

Don't know why there's a difference in the readings. During DFCO, the wideband tops out at 16, the data logger tops out at 18. :iono:

http://www.youtube.com/watch?v=YxesjWxczJo

I need to find a lull in traffic and try this again.

[PETERPOOP]

Wow, 10.5 on the wideband @ WOT/openloop/under boost. Wonder how low it would drop if you had your stock airfilter on.... hmm. Strange it didn't help during your DFCO.

[1NZYaris1]

Did you give Garm a big kiss :biggrin: , or did you get them else where.:rolleyes:
congrates on sorting it all out , :thumbsup: :burnrubber:

[LtNoogie]

Thanks but the tuning continues. Now, I really understand the desire to have an ECU that one can map.

[LtNoogie]

Wow, 10.5 on the wideband @ WOT/openloop/under boost. Wonder how low it would drop if you had your stock airfilter on.... hmm. Strange it didn't help during your DFCO.

During DFCO all fuel is cut off so the wideband and built-in wideband will always detect lean.

[PETERPOOP]

mine stops at 15 and not 16. but i know what you're saying.

yah, i can't wait to tune mine either. :)

[yaris-me]

Congratulations!:thumbsup:

[cali yaris]

awww, glad to see they went to good use. congrats Noogie.

[LtNoogie]

Thanks to you Garm.

[gwasabi]

Told ya Peter! Bigger Injectors FTW lol

[PETERPOOP]

? There were threads about using bigger injectors before you came up with the bright idea.

My lean condition was fixed without bigger injectors anyway.

[LtNoogie]

Peter, there's more than just trying to cure the lean condition. If you study the art of inector sizing, and it is an art. Bigger injectors give the potential for bigger HP because more fuel is burning. You can't go too crazy big or else you'll have other driveability problems.

Part of my quest for more tuning is to cut back on the fuel a little when I'm not boosting. I'm getting a CEL every time I start up the car which I have to clear. Not a biggy with my Dyno-Scan but a nuisance.

[gwasabi]

So wait noog your running rich now?

Why don't you try the 1zz Fuel injectors instead?

[LtNoogie]

So wait noog your running rich now?

Why don't you try the 1zz Fuel injectors instead?

:smile: I'm looking for some right now, cheap. I figured a 1.8L Corolla should be using slightly larger injectors than the 1.5L Yaris but not as much as a 2.4L tC.

The alternative is a boost compensating fuel regulator. I'm getting more fuel than I can handle (CELs) when I'm at low RPMs and am still running rich at WOT. I may want to regulate my fuel pressure down a bit to cure the rich non-boost situations and let the regulator bump up the pressure one pound for each pound of boost.

It's a never-ending disease, this wanting to tweak the car. And I haven't even started collecting the parts for water/meth injection yet.

[cali yaris]

It's a never-ending disease, this wanting to tweak the car.

amen, brother. And when you finally get tired of this one.... you get another one. :wink:

[LtNoogie]

Oh really? I was hoping that there were ways to tweak the Lotus Elise that comes after the Yaris.:biggrin:

The Yaris is prep school for me so that I learn the basics of performance tuning.

[PETERPOOP]

Peter, there's more than just trying to cure the lean condition. If you study the art of inector sizing, and it is an art. Bigger injectors give the potential for bigger HP because more fuel is burning. You can't go too crazy big or else you'll have other driveability problems.




Why are you telling me this?

[LtNoogie]

Because it sounds like you are ready to stop at the putting on the stock airbox. I say get yourself some 1zz injectors!

[LtNoogie]

As some of you know, I've been swapping in and out fuel injectors more often than some people change their underwear. The only way for me to get to injectors 3 and 4 is to take off the valve cover which, although not difficult, is kinda a PITA. So today, I took a hacksaw to the valve cover and removed that stupid little tang that keeps one from removing the fuel rail easily.

http://i426.photobucket.com/albums/pp346/LtNoogie/DSCN0015.jpg

http://i426.photobucket.com/albums/pp346/LtNoogie/DSCN0038.jpg

[PETERPOOP]

Because it sounds like you are ready to stop at the putting on the stock airbox. I say get yourself some 1zz injectors!

well i am done for now. I am getting 12-12.1 AFR during WOT openloop. I will get larger injectors/tb when i get it tuned.

[cali yaris]

Somehow I missed that Peterpoop fixed his lean condition. So who is still getting a lean condition?

[gwasabi]

I'm guessing that the Yaris injectors are somewhere around 200-250cc injectors. from what I can see the 1zz is about 300-350cc. I believe the TC injectors are like 400cc or something. I remember reading a thread somewhere. so I think that 1zz injectors should be good to go for you. Check a junkyard and just pocket em. lol that's what we do in Hawaii.

[PETERPOOP]

I'm guessing that the Yaris injectors are somewhere around 200-250cc injectors. from what I can see the 1zz is about 300-350cc. I believe the TC injectors are like 400cc or something. I remember reading a thread somewhere. so I think that 1zz injectors should be good to go for you. Check a junkyard and just pocket em. lol that's what we do in Hawaii.

we do? Maybe ghetto crackhead thieves!

Somehow I missed that Peterpoop fixed his lean condition. So who is still getting a lean condition?

Well when I put the stockairbox in, I was getting 12-12.1 AFR readings during WOT openloop. Only time I get into that number is during open loop. We all wish it could go into open loop sooner, but I don't think the blitz fuel controller controls that.

[gwasabi]

they're making money off trash man that's kinda theiving themselves lol. I got seatbelts from a 1989 Corolla when I had my hachi. Just walked out with it in my hands all visible and everything. They never said anything.

[thebarber]

fwiw, the trd s/c for the matrix/corolla was never meant to be used w/ the trd intake...it would void warranty otherwise since it would make the engine run lean. matrix/rolla guys use emanage to fix the a/f ratios to run intake, otherwise youre relagated to stock airbox and exhaust

[PETERPOOP]

fwiw, the trd s/c for the matrix/corolla was never meant to be used w/ the trd intake...it would void warranty otherwise since it would make the engine run lean. matrix/rolla guys use emanage to fix the a/f ratios to run intake, otherwise youre relagated to stock airbox and exhaust


sounds about right. however the guys using the CAI aren't having a problem with the AFR. Maybe their intakes aren't doing anything..... :iono:

[PETERPOOP]

youbelieve those bogus charts? ;)

[PETERPOOP]

But i'm not trying to sell you my product. I didn't think people actually believed those dyno charts company put out for intakes.

[cali yaris]

No way the tC injectors are 400cc

[kurokoma-kun]

Congrats Long :clap: glad to hear you are on the right track...

unless you are still having bad dreams, in which a 50-foot-tall fuel injector uses his blue tape beam to battle the air intake monster for supremacy of the earth's AFR? :tongue:

[largeorangefont]

Somehow I missed that Peterpoop fixed his lean condition. So who is still getting a lean condition?

I missed that too, But I have not been following this as closely as I was before.

[largeorangefont]

Noogie,

You probably will never be able to fix the CELs at startup unless you can reflash the ECU to scale the larger injectors (which we cant currently do). You need injectors that are a little smaller to get rid of that. The car has a +/- 25% fuel correction, so you need injectors that flow no more than 25% more fuel than the stock units to avoid getting CELs.

10.5:1 is good, If you can get a fuel controler on there to lean it out a bit you will be in decent shape.