Stacking Tuners Good or Bad? When to and when not to. - Page 2 - Dodge Cummins Diesel Forum
98.5-02 Performance Parts Discussion Discussion of Performance Parts For the 98-02 Trucks No Advertising ...NO ADVERTISING

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post #13 of 14 (permalink) Old 02-17-2017, 01:50 AM Thread Starter
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No worries man I truly appreciate the insights. I have been spending my time trying to build a jigsaw puzzle of polar bear in a blizzard lolol. Any color is welcome.

I look forward to your thread.

I am not %100 convinced the vp has much coding beyond how to read data and perform the action, but again I am only able to look at the result of what happens...So who knows. I have done some REALLY REALLY REALLY bad code during testing and I have yet to experience the vp not doing what I tell it to. If I ask for timing of 0 it will do it and run like garbage, if I ask for timing of 4095 it will do it. The only thing I can't explain is fueling beyond 3500 rpm, but it appears that ECM is shutting down if I look at the data stream. Only a guess but that's what I see.

As for timing I really need to get a diesel timing light to see if my timing thoughts match what is actually happening. I am thinking that is the only way to truly know. The largest OEM timing request I have seen is ~3600. What that exactly equals is a little fuzzy but I would guess 28-29* commanded. As for base 18* I have no idea on that, but if it was 18* base then I have seen ~46*. Keep in mind the engine was cold so OEM timing was approx 4* advanced across the board. That lines up pretty dang close if your testing was done on a warm engine.

Regardless we are way off topic now so I will shut up until you start your thread. In the meantime I have reading to do.

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post #14 of 14 (permalink) Old 02-17-2017, 10:59 AM
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Good info here.
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