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Old 04-24-2005, 10:21 PM   #1
NavyBlueSubaru
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Lightbulb How many CC do you put for Modded wrx injectors?

Im running 750 right now. I left the other value(stock) at 420.

I am really curious what kind of values people are running with their modded injectors on the wrx. If you are running strait thru TGV's, please mention that as well.

I'd also like to know if you have to add/remove fuel in the 0% columns for smoother idle, especially cold idle startup.

Thanks,
Jeff
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Old 04-24-2005, 11:41 PM   #2
DjRez4
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If you have the injectors set properly, you shouldn't have to adjust 0% for proper fueling. I have mine temporarily set at 740, but I know for a fact that the setting is way too low. My LT and ST fuel trims are maxed lean to compensate for the improper injector sizing and the CEL is on. This should all get sorted out on Tuesday at the dyno.
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Old 04-25-2005, 12:33 AM   #3
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I had mine at 760 and it was still pretty rich. Starting at 740 doesn't hurt, but I think you'll find yourself working up to a higher setting. They flow a ton.
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Old 04-25-2005, 05:05 AM   #4
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Perhaps mine dont flow much more than 750 because when i reset the ecu with the engine warmed up already(and my 0% column at all 0), it initally runs lean, like 18:1 until the st and lt compensate and add fuel. There was a thread somewhere that had people saying that they had to add fuel in the low-rpm areas of the 0% column for some reason for it to idle correctly. I have 2.5 in my 0% up until around 2k, otherwise it will idle really lean and cough and almost stall from not having enough fuel to combust.

I would like to get ahold of a deltadash for a few days and see what my trims are. I wish somebody in jax had one i could borrow for a week or so.

i've run the injectors as high as 800 in the past but it was harder to tune for some reason. With them at 750, my map from 10%-100% is pretty close to zero, so i think that is a good spot for me to be at.

Jeff
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Old 04-25-2005, 10:02 AM   #5
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You should always run RICH on startup (like 12:1) and then your ST should fall in the -10 to -20 range. This is because the pump initially is run at 100% IDC. Once it cycles down to 33%, you'll notice that as the car warms up your ST trim gets closer and closer to zero.

Basically you know you're on the right track when the car is +- 5% ST with 0% LT, it idle, and a cooling fan cycle still keeps you in that +-5% ST.

Jorge (RiftsWRX)
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Old 04-25-2005, 10:09 AM   #6
Zackbo
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I'm at 820cc right now; have been all winter; and I still have to put up to -2.5 in some columns of my fuel map. I've increased my stock fuel pressure by about 5psi, though.
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Old 04-28-2005, 06:11 PM   #7
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Quote:
Perhaps mine dont flow much more than 750 because when i reset the ecu with the engine warmed up already(and my 0% column at all 0), it initally runs lean, like 18:1 until the st and lt compensate and add fuel. There was a thread somewhere that had people saying that they had to add fuel in the low-rpm areas of the 0% column for some reason for it to idle correctly.
I am seeing the exact same thing. Mine is set for 750, but I had to up the low idle to about +3 to +4. Anything lower and it starts to lean out and can't compensate.
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Old 04-28-2005, 06:36 PM   #8
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I'm running a value of 740 even though I had them flow tested at 43.5psi to 835-840cc. I originally started with a value around 5 to 6 for the 0 load column, but once the motor warmed up completely it was pig rich and I had maxxed out the st fuel trim trying to pull fuel. I've narrowed down to a value of 2 and it keeps the ST fuel trim -5 and the LT at 0 once it's at normal operating temperature.
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Old 04-29-2005, 08:46 AM   #9
ride5000
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i've heard it said that the modded stockers flow less fuel at low DCs than the proportionality would have you believe... thus the need to bump maf a bit down low.
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Old 04-29-2005, 10:55 AM   #10
NavyBlueSubaru
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Im running them at 800cc right now and coldstarts are rough. It will wander and go as lean as 20:1 several times until it finally warms up. I will probably end up running a few points in the 0% near idle rpms.

Jeff
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