BasePW vs LV8 would that be the one? And how do I know where I want to adjust? To correct the lean condition I was getting.Originally Posted by ZEDRATED
Another question, my tuner didn't set the injector constant to 24, and I think that's why I am getting a rich code once and a while when cruising on the highway, if I change it from stock to 24 will it affect any tables and PUlse widths in any ways? And if so, how???
the injector constant is pretty much your base fueling.
changing it will affect everything fueling related.
imagine all your fueling tables as building blocks on a platform, changing the injector constant is like raising or lowering that platform.
it's never correct to set to exactly 24 for 24lb injectors, since an injector that's exactly 24lbs doesn't exist.
if it's lean everywhere, lowering it will make everything richer, then you fine tune from there; it's perfectly ok to use the injector constant to effect a global fueling change, then fine tune from there.
if it's only lean in a particular area and rich in other areas, best not to touch it, and just fix the lean spot in VE or maf scaling, or whatever.
If I had 24lb injectors but stock were 19, wouldn't that make the computer think it is rich and that is why I am getting an engine code?
doesnt it use the injector constant to determine BLM and INT?
also, here is the funny thing, the rich code only comes up sometimes and only on a cruise at highway speeds, I've let of on the throttle then get back to a cruise and sometimes it'll come back in the 14's:1 AFR and the light goes off, I've shut the car off on the highway and restarted it and then it's fine. Why is it that it only happens sometimes? For the most part my cruise on the highway, the AFR guage is reading 14-15.2:1 and just once and a while the light will come on andy AFR on the gauge goes in the 12's. Why only sometimes? I see the BLM and INT are always below 128 and in around 100-110 so that's why I'm thinking if I changed the injector constant that this would fix this problem. But then my lean problem at 50-75% throttle would be worse. And right now the car is perfect at WOT.
also, when I start the car cold it idles in the high 13's AFR but as I drive off and give it has it runs really rich. Sometimes in the 11's for the first 4-5 minutes of driving. What is a good cold idle AFR, driving AFR when cold? And what is a good AFR at WOT when fully warm?
Last edited by ZEDRATED; 09-25-2014 at 12:30 AM.
yes. if it was tuned for 19lb injectors and you installed, 24lb injectors, it'd make the computer think it was rich. but the computer wouldn't be wrong about that. it would land around 11.5-12:1 afr when it was trying to hit 14.7:1. in that case your BLM trims would be bottomed out at 108 all the time. it would pull some fuel, but it'd still be rich. not lean.If I had 24lb injectors but stock were 19, wouldn't that make the computer think it is rich
well the tune was done for the 24lb imjectors but I'm getting a rich condition intermittently on cruise and a lean condition at 50-75% throttle. So ur saying if the base pulth width tables are adjusted correctly then the constant wouldn't matter? Doesn't it calculate the BLM and INT off that injector constant number or does it look at base pulse width table as well?
there are a bunch of ways to tune fueling. it's all a process of adding and multiplying to a base value, based on various conditions, until the final 'how much do i squirt' number is determined. you can scale a maf table, add fuel to some temperature based table, jack the injector constant up, whatever the tuner decides is best.
it calculates BLM/INT based on o2 sensor feedback, then uses it to fine tune fueling (thats what makes closed loop..well.. closed)
where exactly it's added or multiplied into the fueling calculation actually doesn't matter much... 2*3*4 and 4*3*2 give you the same answer, right?
well I do think most other guys on here will say that that is a shortcut way and not proper and injector constant should be set to what is right.
I still want to learn how to go about base pulse width vs Load table changes. How do I know where to add or subtract fuel and by how much?
and what exactly this means cause my tuner left it clicked on:In theECMswitches table, $32B,uncheck Base P.W. Calibration Method (X=Calc.), to use the MAF injectorpulse width table. Make sure to unswitch it or this method will never work.
I would agree and in addition, your baseline settings need to be correct. As an example, the Min Air Adj. should be correct.
Your Inj. offsets also need to be correct. Very Impoortant.
for sure.. but in the end if you have a maf based car with the correct maf table and your global fueling is tilted either rich or lean on a healthy engine, one would assume that the injector constant is the incorrect factor, and imo scaling it is the correct course of action, rather than just subtracting 9% from the entire maf table.well I do think most other guys on here will say that that is a shortcut way and not proper and injector constant should be set to what is right.
there's a bit of a difference between calibrating by the mfr's specification sheet of a component rather than the actual real-world fuel delivery to the combustion chamber in a specific environment.
just because the manufacturer rates an injector with flow rating X at fuel pressure Y doesn't mean average delivered fuel over the entire 8 or whatever injectors in engine Z is going to be exactly X.
Ok, anyways, I want to try to adjust base pulse width vs load but how do I go about that when I don't have any load value in my log in my definition file for $32B?
engine load is MAP (aka vacuum). lower MAP, higher vacuum, lower load. higher map, lower vacuum, higher load. this is one of the most basic mechanical principles.
hes running MAF based no map so load will be maf grams a secend per cylinder if its in the definition.i just got in from tuning a 350 crate engine converted to TPI in a toyota landcruiser on 12p map code on a 1227165 if you ever want to wire in map and try it out 4.11 diff gears and 35" mud tyres just blaze up on the street LOL
Are there any good definition files for 32b?
how do I go about adjusting the base pulse width table? How do I know where to add or subtract fuel???
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