bosco659

I recently installed a set of upgraded (Toyota Supra) injectors in my supercharged Runner. I bought them on eBay a while ago and never looked inside the boxes until I installed them. The part number on the boxes (brand new Toyota boxes) was 23209-46031 which is the proper part number for a 305cc Toyota Supra injector. Problem is (I hope not), that the part number molded into the injector (Denso) does not match and is 23250-46031.

Is this the correct injector or was I ripped off by the seller? I'm hoping that the Toyota Injector number and the Denso part number aren't directly related to one another.

Your input is appreciated.

Thanks

Vic

bosco659

^^^^

Anyone??

midiwall

I think you're okay... A Google search turned up this thread on another forum back from July:
http://www.customtacos.com/ubbthread...?Number=564780

If you go through the thread, you'll find a comment from Gadget saying that they're 305cc injectors.

bosco659

Thanks Mark. Read the thread and saw the comment. Tried all avenues to find out from dealers what these injectors were originally used for but no info was available. Just wanted to be sure they were ok because I am having to run some weird fuel correction with my SAFC to achieve a 12:1 AFR.

Thanks again.

Vic

midiwall

Hmmm... I'm curious, so I gotta ask, what are you running that you're trying to hit 12:1? You mean duing WOT or across the board?

bosco659

Trying to tune for 12:1 under full boost. I can only achieve the 12:1 now when the ECU goes into open loop. I understand that I cannot do anything to correct AFR's ahen the ECU is in closed loop .

Not 100% certain when I am in open loop but 12:1 is seen at WOT and approximately 3700 rpm. I am adding anywhere from 3 to 5% fuel in this range. Have the 305cc's and Walbro 190 lph with an Apex'i SAFCII.

FWIW I found that the 23209-46030 = 23250-46030 = 305 cc flow rate. Could that mean that 23250-46031 = 23209-46031???

midiwall

Hmmm... the best way to know when you're really in open loop is to use a good OBD II reader (not just a code puller), and it'll tell you flat out when the ECU gets there. Guessing based on RPM will leave you with just a guess.

I've tried to download the documentation for the SAFC but the PDF shows up as 64 pages of blank pages on my machine.

How do you interact with the box? Are you entering fuel correction on a RPM vs. air flow grid? How is the airflow shown?

From how the product page reads, it looks like the SAFC will let you enter fuel adjustments against one of 15 fixed scales. Maybe you can get a closer curve match by chosing a different scale?

Does the box interface only with the MAF signal (and RPM)? What about the O2 sensor?

With all of the piggybacks I've seen, none of them inately know when WOT happens... you usually setup the limits of the RPM vs. air flow grid such that the "rightmost column" (columns=airflow, rows=rpm) is the WOT column. For example, in my case running a PerfectPower SMT, (check this thread for screen shots), I see the ECU switch to open loop at around 82% of max airflow when I'm standing on it. But, the ECU will switch at other times as well.

The point is that the decision to move to open loop doesn't just come from the ECU looking at RPM. It's looking at a number of things, manifold vacuum, airflow (generally related of course), RPM, TPS...

Also, what are you using to watch A/FR? This is something else you can get from a good OBD II reader. This is more of a curiosity, for what your goal is right now, I'm not talking about a wideband O2.


_maybe_, but there's more to injectors than their flow rate. There's the resistance of the coil, the electical hookup, the length of the barrel, etc. You'll have to be "careful" when trying to cross part numbers like this. Ideally, having one of each injector in your hand is a good way to compare aspects other than flow rate.

bosco659

The injectors are physically the same size and clip right into the factory harness. They are both high impedence with a coil resistance of 13.5 and 14.2 ohms (different injectors p/n's).

I am using an Innovate Motorsports LM1 wideband to measure AFR's and data log AFR's to rpms.

Thanks for all of your input Mark.

Vic

midiwall

Right on... sound like you're set to go!


I got me one of dem! I did my initial tuning with it, and then "got used" to reading the narrow band A/FR via a meter in an A-pillar pod


You're quite welcome Vic.


I did a bit more reading, and I think you might want to experiment with different curve on the SAFC to see if you can get it to settle into open loop more often.

Please let us all know how it goes!