6.7 408 lq4 with holley intake 300-122
95mm throttle body
54 lbs injectors
custom cam by comps
circle d 3200 stall converter
2 bar map
port and polished prc 2.5 cathedral 317 heads
10.9 : 1 compression
93 octane
it little long, did stop and go, 55-60 and little WOT passes
Thanks
Overall it doesn't seem that bad.
Commanded fueling under full throttle is kinda rich and the o2 sensors show it's pretty rich as well. Hard to tell what it's really like without a wideband oxygen sensor. It also looks like it starts to lean out past 6,300rpm going towards redline on the one pull, the o2's start to drop fast.
Timing of mid 20's is really safe and will always make good power.
The tune file would be helpful too, just to make sure things are setup good. We can only assume the injectors are name brand with data and so on.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
The injector are holley accel high impedance
I do have a AEM afr gauge and it just bounces around to much. Its little old and needs to be recalibrated.
A few things/question.
Did those injectors have data with them?
I ask because you say they are 54lb/hr just the injector flow rate in the tune has them around 47-48lb/hr.
Your cylinder volume is still that of a 6.0, now that it's a 6.7 you need to increase that number so it's accurate. All airflow/fueling calculation take the size of the engine into account.
Don't mirror the high/low octane timing tables, the low octane table needs less timing in it so that it can pull timing away if it knocks. Dial the low octane table back about 6 degrees everywhere.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
And I was wrong about the injectors
there 48lbs
wish they had a picture of a donkey on here
and with the cylinder volume just under engine, general, size and cylinder volume
change it to 0.8375 for the added stroke and bore and that should change the calibration.
Its a pdf idk if will open and haven't nailed down the actual min pules width
Fuel Compatibility Standard Gasolines & Ethanol Flex Fuels
Fuel Pressure 300 kPa
Static Flow Rate n-Heptane: 5.8 g/sec (46 lb/hr, 508 cc)
Dynamic Flow Rate n-Heptane: 13.35mg/pulse (2.5 ms PW, 20 ms Period)
Offset 0.2 ms
Minimum Linear PW 1.2 ms
Linear Flow Range (SAE) 9.63
Opening/Closing Time 1.15 / .75
Coil Resistance 12.0 •
Injector Inductance 6.5 mH
Minimum Operating Voltage Calibration optimized against MOV requirements
Connector USCAR
Spray Pattern 15? Cone
Installation Compatibility Deka I / IV Long Installation Compatible
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