RomRaider

I'm getting close to doing some fairly serious surgery on my Baja. The fuel system is a total disaster, so I'm basically starting at square one and building it from the ground up. The primary change will be ditching the 550cc Yellow top sidefeed injectors, and going with topfeed TGV delete housings and 565cc blue injectors. I've already had a dead injector (#3), though I was able to get 4 'good' injectors, I broke one installing it, and thus, only replaced the #1 and #3 injectors. Either #2 or #4 is now either restricted flow, or the electrical part is weak, because I'm getting really lean at idle, and I have verified it is not an air leak.

So, I'm looking at 565cc STI injectors, but I'm not entirely sure how to set the tables in RR to get them to work. The 2005 Baja has fewer tables for the injector offsets than the 2007 STI map, and I'm not sure if I can just copy/paste the entire STI injector tables over without exceeding a size limit or something in the ECU itself...

Thus, I'm asking here, what should my process be? Just straight up copy/pasta the existing tables when I put the injectors in, or do I need to maths/edit differently?

This isn't going to be the only change to the fuel system, but it will be the only change I really need to tune for right now (I'm going to also put in a higher flow capable fuel pump, but I won't be touching the FPR/fuel pump duty cycle, and letting that run 'stock' for now).

Once I get a 'safe' baseline for the injectors, I will use the Injector scaling tool in RR to fine tune it, but I want to at least have it 'close enough' that it won't either go out of limits on fuel trim, or damage anything (or just not run at all).

There literally are no 'local tuners' that I would trust, and the closest tuning shop is a 5 hour drive away. I would have to tow the Baja there, and it would cost me over $1,000 to do so, so I really need to be able to do this myself...

Injector scalar is not actually flow based. It's time based.

The value is "converted" by standard/normal in opensource, by dividing 2707090 by the raw value used by the ecu, which is a duration in microseconds to equal stoichiometric at 1 gram per revolution.

1 g/rev could also be explained as a mass of 1 gram of air, per revolution, or mass air flow of 1 gram per revolution.

Typically Mass Air Flow is related to grams per second, (MAF g/s) but they are both "mass air".

because injector scalar is duration * g/rev, any error in MAF or VE scaling is directly proportional to error in both types of mass air as well as injector scalar.

With that, we explain the differences of injector scalar between regions with different fuel, but the same overall system. (eg: 02 jdm wrx vs 02 usdm wrx) but this does not explain why the "flow scalar" is usually or always less than the flow tested values for injectors. (eg: duration is longer for a fuel type that has a lower gas AFR ratio) or explain why say, dark blue top feeds in the US can come with different scalars and latencies between different years or models. (different fuel systems, MAF, airmass compensations, along with scalar/latency) where they are comping different tables and trying different injector calibrations.

In summary, your MAF/injectors, intake manifold, and overall fuel system would match a 2007 sti the most, so I would use any table that is related to MAF/airmass comps/per cylinder injector comps/scalar/latency/etc from the 2007 sti.

If in the event that a table is a different size, then you would consider treating that table differently, but all of the others should start as direct copies. This is where I would start. If you do not have the stock intake, i would use the intake scaling you have (presumably tuned/developed for your aftermarket intake) and automatically plan on double checking everything everywhere.

Overall, I do not recommend the romraider scalar/latency or MAF scaling utilities because they do not have enough/correct filters being applied. I would instead process data from a datalog in other software like MLV or Baldur's Control Systems log software.

Okay, I did check, and most of the tables are identical between stock maps.

The MAF scaling is different, and the 07 STI has more cells in the table than the Baja map. I'm assuming this is where the big difference is? I wonder if the difference here is due more to the larger turbo on the STI vs the TD04 the Baja came with, but I'm thinking that's not the case.