First start, 7060 to 7427 Conversion - Crazy rich at idle

[Daveo91]

The '7427 has a parameter for Injector Flow Rate. What is the injector part #?

Gearhead-efi link for TBI injector flow rates: http://www.gearhead-efi.com/Fuel-Inj...d-part-numbers

dave w

Thanks, Dave. They are 17084304 injectors, 74 lbs/hour. I'm assuming I should change the injector flow rate in my BIN to that number? The .xdf has entries for TBI lbs/hour and grams/sec. Do the conversion and enter both? It also has entries for other fuel injection systems - ok to ignore those?

[tayto]

what pressure

[Daveo91]

what pressure

Good question. I should have checked since I have a gauge at the TB. I will check next time I run it, but it usually runs around 13 psi. Too much?

Thank you.

[stew86MCSS396]

13 psi should be fine. That xdf regarding lbs/hr gms/sec, you change 1 and they all change respectively based on "fuel injection system."

[Daveo91]

13 psi should be fine. That xdf regarding lbs/hr gms/sec, you change 1 and they all change respectively based on "fuel injection system."

Thanks!

I changed the 70 lbs/sec to 74. Ran it again after that and it seems to have helped, but still very rich. Actually was able to drive it this time. After a long warm up it will rev and accelerate without bogging, at least enough to drive. I got it to go into closed loop and much more driveable in that scenario, but most BLMs are 110 or below, some pegging low at 90. It seems rich across the range.

My question is what to adjust? Should I adjust VE table as I know how to do? (Dave W's averaging spreadsheet) Or should I adjust more globally, since it's rich everywhere? If globally, how do I do that? Change the injector flow rate?

One other thing: the mask I'm using shows manifold air temp as -40 deg C. I noticed there is a flag for MAT that is NOT check marked so I think it shouldn't matter? But I just want to ensure that there's not a problem with the computer thinking the air coming in is freezing cold. Engine Temp and coolant temp values appear to be correct.

[dave w]

I would try injector flow of 78, with the expatiation that all BLM averages will increase from rich (less than 128) to a number much closer to 128. An injector flow rate that has some VE cells with BLM averages rich and some VE cells with BLM averages lean is a good setting.

The Manifold Air Temperature settings are correct, and -40 temperature is correct too.

dave w

[Daveo91]

I would try injector flow of 78, with the expatiation that all BLM averages will increase from rich (less than 128) to a number much closer to 128. An injector flow rate that has some VE cells with BLM averages rich and some VE cells with BLM averages lean is a good setting.

The Manifold Air Temperature settings are correct, and -40 temperature is correct too.

dave w

Thank you, Dave. I've gone up to 78 on injector flow rate - it improved things, but still very rich. No BLMs are above 128, most are in 110s or lower. Should I just keep increasing flow rate in 4 lbs/hr increments until I see some BLM values over 128?

One other thing: at warmed up idle, closed loop, spark advance is jumping around a ton, all between 15 and 25, mostly between 15 and 20. Something to be concerned about?