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If you are still using the 370cc injectors you need to change the Injector correction as those are smaller than the Power FC is expecting; both Injector Lag and Size will need to be adjusted. If you use the same side feeds as a EJ20G in the EJ22T let me know. I have some 480cc EJ20K injectors sitting here that I could send. I personaly say go with nothing smaller than 550cc as the 16G and everything else I have seen around that size or a bit smaller easily maxes out the stock injectors respectivley. I personally would go with the biggest injectors you could fit. I have one set of Sard 850cc/Helix 860cc? and then a set of Nismo 740cc.

If you want these 480cc and they are plug and play for you r fuel rails you can have them very cheap. They are sitting in my spare engine and I have no use for them at the moment.

Sorry, I was only thinking OEM ECM.

I only used the EJ20g ECU for an afternoon to test with. I didn't want to accidentally fry my PFC.

I ran the EJ20g ECU with stock 370cc injectors and the stock aluminum Hitachi MAF. I also had not switched the pressure sensor ground yet. Those are most likely to be the reason for the check engine light. The EJ20g ECU did not have an idling or detonation problem. However, it did not want more than 1/2 throttle. It would fuel cut at anything more than that.

0 to 1/2 throttle = perfect.
1/2+ throttle = dead.

The PFC works fine, but, of course, needs tuning. I ran the PFC for about 5 days and a tank of gas with the Hitachi AFM. This is when I had stalling problems when returning to idle. Once idle was achived it was rock solid. The wideband showed a reasonably good match between the Hitachi meter and the 370cc injectors, even with the PFC controlling them. No changes to the PFC at this point.

Monday I swapped in a JECS AFM and the return to idle problem was gone. But of course it was way too lean now. So I scaled the injectors up and it's OK now. Safe to drive. Now the 'real tuning' begins. I'm still reading my tuning books, but am slowly adjusting the injector scaling to get the raw wideband readings to match the map. That's the first step. That way when I enter '12.50' AFR into the map I can expect '12.50' out the tailpipe.

You are tuning with the Datalogit I assume? Are you on the mailing list? There are a lot of very knowledgeable people on there. Did you recalculate your injectors from the the 440 they are expecting? Do the EJ20G injectors fit your EJ22T rails? I have some I can mail tomorrow if you want them for $20. It is important for the Injector Lag and size calculation to be spot on. Also did you let the Power FC learn the idle after being initialized?

Datalogit: yep.
Mailing list: yep.

370 * 1.20 = 444. So that's where I started.

I'm now at 1.18 correction and AFRs are very close. I do need to adjust lag, but the general concensus seems to be that lag settings are more crucial at low RPMS. My plan is to adjust scaling at high RPMs then fine tune lag at idle/low RPMs. Unless you know the 370cc lag time. I can't find it.

I've got a set of 440s to put in eventually. I'm in the mood to try and find a safe base map for a completely stock EJ22t first. Tuning a stock engine 'back to stock' seems the safest way to improve my mapping skills.

This time I did not let it learn the idle. Once I nail the injector specs I plan on a full reset to clear any remnents of my testing. Then it will get the full cold start idle learning procedure.

For $25 Witch Hunter can tell you the injector lag time if you send them one. You should have been at 1.189 correction from the get go. I would have rounded to 1.19. The EJ20G injectors are 440's right? Why would you be messing with your injector correction to tweak your AFR?

Because once the engine is warmed up the basic fueling calculations are based almost 100% off the MAF reading.

Lets looks at a specific cell in the AFR map for example. In that cell your calling for a 13.00:1 AFR. Lets say your wideband is reading 12.00:1. You have only 2 ways to correct this.

1: scale the injector down, so it injects a bit less fuel. This is prefered if much of your map seems to be off.

2: scale the MAF so it calculates less load. This can also bo done with a PFC.

Considering that the MAF is the same as what the PFC is 'expecting', and the injectors are not, I'm choosing option 1.

Remember, all this is 'pre tune'. Getting your map to match the wideband is only convience. It's nice to be able to type 14.7:1 in the map and get 14.7:1 on the meter.

PhyrraM wrote:I only used the EJ20g ECU for an afternoon to test with. I didn't want to accidentally fry my PFC.

I ran the EJ20g ECU with stock 370cc injectors and the stock aluminum Hitachi MAF. I also had not switched the pressure sensor ground yet. Those are most likely to be the reason for the check engine light. The EJ20g ECU did not have an idling or detonation problem. However, it did not want more than 1/2 throttle. It would fuel cut at anything more than that.

0 to 1/2 throttle = perfect.
1/2+ throttle = dead.

The PFC works fine, but, of course, needs tuning. I ran the PFC for about 5 days and a tank of gas with the Hitachi AFM. This is when I had stalling problems when returning to idle. Once idle was achived it was rock solid. The wideband showed a reasonably good match between the Hitachi meter and the 370cc injectors, even with the PFC controlling them. No changes to the PFC at this point.

Monday I swapped in a JECS AFM and the return to idle problem was gone. But of course it was way too lean now. So I scaled the injectors up and it's OK now. Safe to drive. Now the 'real tuning' begins. I'm still reading my tuning books, but am slowly adjusting the injector scaling to get the raw wideband readings to match the map. That's the first step. That way when I enter '12.50' AFR into the map I can expect '12.50' out the tailpipe.

Oh okay, I see. The reason you couldn't get more than half was probably the MAFS. So it would seem I've got some issues to figure out on my car then. Thanks!

Any update? Do I need to go buy a 20G ecu? I found one for 75 bucks.

I have one I will sell for $60 Shipped.

No updates as far as the EG20g ECU is concerned.

I cannot see using one on an EJ22T. Some ARE chippable, but the people/companies that can do it don't have access to an EJ22t or American gas.

I do have a rough, but seemingly safe, base map for the PFC done. Work continues.

Did the Stock EJ20G ECU ever work correctly on your car?

I never tested it, but I'm positive that it would after my mods.

Please make a EJ20G ECU into a SS step by step wiring conversion "For Dummies" when you have some free time...

+1!

I'm planning to. Moving has been getting in the way.

Any more tuning? Quantitative (or more Qualitative) results? How is the tuning process working for you? Is it fairly intuitive with the logging software?

I'm still very interested in this project, and it is tops on my short list of EM solutions. I've been keeping an eye out for a EJ20G PFC, and I'm inheriting my wifes laptop (she gets a new one from work this year). Maybe this fall I can get into this.
I'd run 440's and the plastic MAF so a base ej20G map would work (with some timing pulled initially).

-Chad

No more tuning, but I've been running the PFC for this whole time with zero problems and getting 18-20 MPG in 50/50 mixed driving. Completely stock except for the addition of the previously mentioned ignitor and a Diamond coilpack. California 91 octane from various stations.

I have actually started collecting my pictures to sit down and do a write-up over the long weekend. If you keep a fire under my ass, it has a pretty good chance of getting finished.

Cool - thanks.

Match in hand.... that's a bad visual

Write it up!!!!!

I'm the one who PM'ed you on RS25. This is great information! How about making a conversion harness? I'm sure some people (like me) would be willing to buy it.

impreza_GC8 wrote:I'm the one who PM'ed you on RS25. This is great information! How about making a conversion harness? I'm sure some people (like me) would be willing to buy it.

I don't trust my ECU harvesting and soldering skills enough to let them out in the wild. But if you provide me with a proper jumper harness ( http://bbs.legacycentral.org/viewtopic. ... &start=119 ) and $40, I'll make one.