80lb injector data base tune
Yeah, that's drastic. I had a 16 degree overlap cam that was in the 30s on a 346 with 52lbs Ford GT500 injectors. You should probably be in the 40s tho depending on the cam size.
But as you can see, you're nearly at the bottom of the injector with it at 1.9ms and you still aren't at stoich. You may have to do some offset raping to get them to idle right. Zero out of the short pulse added. If that doesn't help, go into your offset table in the 11.5-14V range and decrease everything by 10%.
You may be able to regain some control of the injector with the VE table. Keep min fuel mg at .008. It's on the wrong side of the knee that low, but let's keep it there.
But as you can see, you're nearly at the bottom of the injector with it at 1.9ms and you still aren't at stoich. You may have to do some offset raping to get them to idle right. Zero out of the short pulse added. If that doesn't help, go into your offset table in the 11.5-14V range and decrease everything by 10%.
You may be able to regain some control of the injector with the VE table. Keep min fuel mg at .008. It's on the wrong side of the knee that low, but let's keep it there.
Next I decreased injector offset table by 10% in the 11-14V regions. I was able to regain better control of the VE table while RTT.
Decreased the injector offset table by 5% at a time and now the car runs much better throughout the entire rpm without touching the VE table. Still rich but a much better baseline to mess with.
Teching In
Joined: Sep 2011
Posts: 7
Likes: 0
Help LQ9 with sloppy stage two cam and 80lb Deka’s
Im tuning with EFI Live, I’m running an LS1B controller, what all do I need to change for these injectors? I tried the sticky data spreadsheet up top but doesn’t seem to work.
Im tuning with EFI Live, I’m running an LS1B controller, what all do I need to change for these injectors? I tried the sticky data spreadsheet up top but doesn’t seem to work.
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Do you have the data for your injectors...?
You have to set B4001 (IFR) to your injector's flowrate, this depends on your measured rail pressure.
You have to populate the various injector characterization tables from that data:
B4003 - Minimum Pulsewidth
B4004 - Default Minimum Pulsewidth
B4005 - Small Pulse Adjust
B3701 - Pulsewidth Voltage Adjustment
Also:
B9021 - Minimum Transient Pulsewidth (available only for several OS's).
You won't run out of range in the IFR table, but you may exceed the airflow 512 g/s limit in the PCM/OS... you may need to scale for this.
You have to set B4001 (IFR) to your injector's flowrate, this depends on your measured rail pressure.
You have to populate the various injector characterization tables from that data:
B4003 - Minimum Pulsewidth
B4004 - Default Minimum Pulsewidth
B4005 - Small Pulse Adjust
B3701 - Pulsewidth Voltage Adjustment
Also:
B9021 - Minimum Transient Pulsewidth (available only for several OS's).
You won't run out of range in the IFR table, but you may exceed the airflow 512 g/s limit in the PCM/OS... you may need to scale for this.
Teching In
Joined: Sep 2011
Posts: 7
Likes: 0
Do you have the data for your injectors...?
You have to set B4001 (IFR) to your injector's flowrate, this depends on your measured rail pressure.
You have to populate the various injector characterization tables from that data:
B4003 - Minimum Pulsewidth
B4004 - Default Minimum Pulsewidth
B4005 - Small Pulse Adjust
B3701 - Pulsewidth Voltage Adjustment
Also:
B9021 - Minimum Transient Pulsewidth (available only for several OS's).
You won't run out of range in the IFR table, but you may exceed the airflow 512 g/s limit in the PCM/OS... you may need to scale for this.
You have to set B4001 (IFR) to your injector's flowrate, this depends on your measured rail pressure.
You have to populate the various injector characterization tables from that data:
B4003 - Minimum Pulsewidth
B4004 - Default Minimum Pulsewidth
B4005 - Small Pulse Adjust
B3701 - Pulsewidth Voltage Adjustment
Also:
B9021 - Minimum Transient Pulsewidth (available only for several OS's).
You won't run out of range in the IFR table, but you may exceed the airflow 512 g/s limit in the PCM/OS... you may need to scale for this.
Decreasing the offet table by 8% gave me better control of the injector at idle however anything off idle was about that % lean. Car ran and drove fine but I didnt like. I have my short pulse at 1 ms, short pulse adder was 0'd but I restored it to 80 data, just havent tested it yet. Lowering the short pulse to 1ms pulled all the fuel out. However, I get o2s at idle that wont swing anymore, they are pinned rich but the shorts show -7. I'm going to reduce the proportional fuel and restore the error to stock and see what it does. If I can get them to oscillate again, shes good to go.
stock long block with a blower and 80s is what I'm working with. Hence why I am reluctant to play with the VE all that much.
stock long block with a blower and 80s is what I'm working with. Hence why I am reluctant to play with the VE all that much.
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