View Single Post
Old 08-05-2018, 03:46 PM   #8
1stgensleeper
 
1stgensleeper's Avatar

Name: 1stgensleeper
Title: Too Much Time
Status: Not Here
Join Date: Jul 2012
Location: Modesto, California
Member`s Gallery
Posts: 773
Quote:
Originally Posted by paulb View Post
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
Great info Paul, thanks. So by running a larger injector with a shorter injection event you are increasing your rate of injection, does this allow you to run less timing and therefore make things easier on the engine? I’m currently running a set of exergy 100% overs but I have a set of industrial injection’s stage 1 cobras that I’m contemplating putting in incase I want to step things up in the future. My head is off and getting redone so now is the time to decide.
__________________
2006 QCLB 4x4 manual vb 47re, Savage Fab He351, exergy 100% overs, flo pro 5" exhaust
  Reply With Quote