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Question about wire tap fuel stretch

Posted

So I know Quad and other tuners stretch the injection solenoid pulse width by some microseconds  like 1500 or 1700. At what RPM? Or is that the max at any speed. This is how they get around the Vp can bus internal max fuel delivery limit. Why not in degrees instead of microseconds? Example 1500 microseconds at 1000 rpm is 

 

1000/60 = 16.7 RPS

16.7 x 360 = 6000 degrees per second

6000/ 1000000 = .006 degrees per microsecond

.006 x 1500 uS = 9 degrees @ 1000 rpm

 

At 3000 RPM the same 1500 uS = 27 degrees.

 

Is it explained somewhere ?

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It is max allowed within the map.  

 

So you are right with stretch set a 1500 at @1000 rpm it is 9 * of crank rotation in time length vs 27* at 3k rpm

 

 

 

 

 

  • Author

So if I understand this correctly. 

 

At 30 PSI boost and 1000 RPM 65% of 1500 uS is 975 us which would be 

5.85* of extended injection beyond what the VP PSG is doing.

 

At 2250 it does 20.25* additional. 

 

It tapers off above 2250.

 

Now it makes sense thank you.

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Welcome To Mopar1973Man.Com LLC

We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.