High RPM Fueling with V2 How-To

[Me78569]

I have been looking at the tunes people have been running and I am seeing a common trend, the 30 psi canbus fuel setting is set a few % above the 28psi setting.  For normal DD duties this is fine and dandy, but if you are after high RPM Fueling you should make a small change to your tune. 

 

Rather than setting your 30 psi setting a few % higher than your 28 psi setting you should put your 30 psi setting at %150.   This wont make the tune any less smooth as %99 of the time if you are at 28psi + your are likely at WOT and likely your tune is asking for max duration already.  So if the max fueling command is 4095, and your 28 psi setting puts you at 4095 already then no amount of % jump is going to make the fueling command go any higher, thus you wont feel any difference in your fueling curve when you go from 28psi to 30 psi. 

 

everyone is thinking " big deal you are at max duration what does it matter if the 30 psi setting is at %150 or not?"  

 

What this means is you end up with fueling higher by %30 for longer if you up your 30 psi setting from 120% to say 150% because as rpms top 3500 the ecm begins to pull fuel like crazy.  Since the quadzilla uses the ecm fueling command to multiply on top of you can see how using %150 rather than %120 will hold fueling longer.   

 

 

Once you hit 3700 rpm however the quadzilla gives up as the ECM needs to see a fueling command return from the vp that is 0 otherwise it goes into runaway protection mode.  

 

To see this in a visual manner look at this badly created graph.   The blue line is a tune with the 30 psi setting at 150% the orange is a tune with a 30 psi at %120.  you can see both tunes max out at 4095, but the %150 will hold peak longer.  

 

 

 

Another key point is if you want to make power above 3k rpm your timing better be as high as it will go.  If high RPM fueling is your goal, then you should set your timing "max" value as high as it will go.

 

 

 

 

For when you need just that little bit more, using %150 at 30 psi setting is like having an AMP that goes to 11.