scherejs

iTrader: (12)

I'm hoping someone can offer some help on here. There isn't much support on Nasioc regarding injector scaling. I helped a friend install PE 650's in his WRX last night. The stockers are 480 and the stock map has them scaled to 420. He scaled the 650's to 620, 600, 580, 550 ,530, 500 and none were working. The car idled like hell and the CEL kept flashing. The only thing changed on the map was the injector scaling. Nothing was done to the latency tables or anything. Hopefully someone can point us in the right dirction to get this thing to run better. I looked at some threads on here and tried to apply what I read to this situation, but nothing helped.

iam12nv4

Definately look at the latency tables. I had the same issue with mine. IM willing to bet the car idles real lean at idle. Have you done any logging yet?

I had to go slightly higher on my modded 740's

2002-2005 USDM Subaru WRX 2.0L Fuel Injector Latency Settings
420 cc 6442 2002-2003 WRX 2.79, 1.49, 0.98, 0.68, 0.38
550 cc 5120 OEM/Denso STi Pink Fuel Injectors 2.79, 1.49, 0.98, 0.68, 0.38
650 cc 4160 2002-2003 WRX PE 650cc 3.69, 2.39, 1.88, 1.58, 0.68
660 cc 4100 2002-2003 WRX Helix Power 660cc 5.79, 2.49, 1.98, 1.18, 0.68
740 cc 3656 2002-2003 WRX OEM Modified 2.79, 1.49, 0.98, 0.68, 0.38
785 cc 3775 2002-2003 WRX Advertised 785cc 2.55, 1.74, 1.31, .076, .055
800 cc 3380 2002-2003 WRX OEM Modified 2.79, 1.49, 0.98, 0.68, 0.38
800 cc 3380 2002-2003 WRX PE 800cc 9.75, 2.79, 1.37, 0.98, 0.70
820 cc 3450 2002-2003 WRX Helix Power 820cc 5.79, 2.28, 1.78, 1.12, 0.62
850 cc 3180 2002-2003 WRX OEM Modified 2.79, 1.49, 0.98, 0.68, 0.38

2006 USDM Subaru WRX 2.5L
560 cc 4916 2006 2.5L WRX 4.70, 2.65, 1.73, 1.20, 0.99

2005-2006 USDM Subaru LGT 2.5L
515 cc 5200 2005-2006 LGT 7.74, 2.78, 1.57, 1.05, 0.84
720 cc 3720 Nismo 720 2004+ STi Fuel Injectors 4.68, 2.38, 1.29, 0.92, 0.67
730 cc 3670 JECS A46-Z00 730 2004+ STi Fuel Injectors 4.62, 2.35, 1.27, 0.88, 0.67
816 cc 3282 Modified 2004+ STi Fuel Injectors 7.66, 2.69, 1.37, 1.05, 0.75
850 cc 3150 PE 850cc 2004+ STi Fuel Injectors 9.80, 2.70, 1.80, 1.50, 1.30
860 cc 3390 Helix 860cc 2004+ STi Fuel Injectors 6.05, 2.13, 1.28, 0.92, 0.59

2004-2005 USDM Subaru FXT 2.5L
500 cc 5372 2004-2006 STi 7.66, 2.69, 1.37, 1.05, 0.75
720 cc 3730 Nismo 720 2004+ STi Fuel Injectors 4.68, 2.38, 1.29, 0.92, 0.67
730 cc 3625 JECS A46-Z00 730 2004+ STi Fuel Injectors 4.62, 2.35, 1.27, 0.88, 0.67
816 cc 3290 Modified 2004+ STi Fuel Injectors 7.66, 2.69, 1.37, 1.05, 0.75
850 cc 3160 PE 850cc 2004+ STi Fuel Injectors 9.80, 2.70, 1.80, 1.50, 1.30
860 cc 3400 Helix 860cc 2004+ STi Fuel Injectors 6.05, 2.13, 1.28, 0.92, 0.59

2006 USDM Subaru FXT 2.5L
560 cc 4916 2006 2.5L FXT 4.70, 2.65, 1.73, 1.20, 0.99

2004-2006 Subaru WRX STi 2.5L
500 cc 5372 2004-2006 STi 7.66, 2.69, 1.37, 1.05, 0.75
720 cc 3730 Nismo 720 2004+ STi Fuel Injectors 4.68, 2.38, 1.29, 0.92, 0.67
730 cc 3625 JECS A46-Z00 730 2004+ STi Fuel Injectors 4.62, 2.35, 1.27, 0.88, 0.67
816 cc 3290 Modified 2004+ STi Fuel Injectors 7.66, 2.69, 1.37, 1.05, 0.75
850 cc 3160 PE 850cc 2004+ STi Fuel Injectors 9.80, 2.70, 1.80, 1.50, 1.30
860 cc 3400 Helix 860cc 2004+ STi Fuel Injectors 6.05, 2.13, 1.28, 0.92, 0.59




IDC = IPW * rpm / 1200 = %

IDC IPW RPM
61.5069 16.38 4506

scherejs

iTrader: (12)

Thanks. Only logging that we've done is looking at the stft at idle with the different scaling. We were getting swings of +12 to -11.

scherejs

iTrader: (12)

Well went back to work on it today and noticed one of the injectors are leaking (spraying) fuel. So we didn't do any logging or tuning obviously. My question is should we keep the stock scaling and only change the latency table to start with to give us a base to work with or scale the injectors 10-15% below their stated flow rate and adjust the latency table to give us that starting point?

JohnBradley

iTrader: (30)

Shouldnt this be on NASIOC? I mean injector scaling is injector scaling more or less. The Subaru software calculates like most other things, but surely someone there has the latency and scaling for this WRX?

iam12nv4

Its is, work with the latency first, let the car idle for 16 mins and see where your fuel trims are at. there are tons of write ups in this forum and NASIOC. Thats where I pulled my info from. This I did 16 minute cycles of cruising steady throttle to get the injectors dialed in. From there tweaked timing and maf scaling for WOT runs.

scherejs

iTrader: (12)

Nasioc is where I told him to look. He said that he couldn't find anything helpful over there. He must have not looked hard enough. I just posted this over here to see if I could get some info to help him out. Thanks again for getting those tables for me.

Slomo Corey

iTrader: (1)

You mentioned the CEL Light was flashing.... Make sure you unjump the cable after uploading the new revised map.

As someone else said... Watch your short Term Fuel Changes and work off that. It will get you in the right direction.

Fix your fuel leak first for sure...

Corey