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Old 08-04-2018, 01:40 PM   #5
paulb
 
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Name: paulb
Title: Too Much Time
Status: Not Here
Join Date: Jul 2006
Location: Klamath Falls, OR
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Posts: 1,673
I am a fan of using large injectors and reducing the pulse width. My 05 runs less then stock duration and makes 1100hp.

Not all large injectors react the same way. Idle haze is more of a product of injector and nozzle design, than nozzle flow. Look at the flow sheets and see how even the flow is at low flows. Even flows that are lower then what you plan on running. This is a good indicator on what will happen at idle flows.

The lowest duration that the ecm will command is 160us. If in your tuning you command less then 160us, the ecm is skip that injection event. With large injectors you may have problems getting low enough duration for it to idle without skipping events (rough idle). You need to not only reduce the main event, but you will need to reduce ( or eliminate) the pilot and post events.

As a general rule. Longer injection events with smaller injectors is better for fuel economy, and short injection events with larger injectors is better for producing power, especially at higher rpms.

Paul
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02 4x4 Auto Mach 6+'s, Drag Comp,Source Automotive Twins, Ultimate Transmission
05 2500 4x4 Auto 3.73 BBI 4's, Smarty Touch, Source Automotive Twins, F1 springs and Cam, Opie's bypass system, Mitusa, PPE Dual Fueler, Ultimate Transmission, Opie shafts,Isspro gauges
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