Mr. P.
April 28th, 2011, 01:36 AM
Hi Gents -
I'm stuck, and I could really use some feedback on my tuning approach; vehicle is 2003 Silverado SS (LQ9) w/ Paxton Novi-1500 supercharger, 72# injectors, ARH longtubes, and 3000-RPM converter. Tune is COS 3, CLSD with 2-bar MAP sensor.
The first step I took was to calculate the new IFR for the injectors - the stock value was "3.179688", and using Marcin's IFR spreadsheet I plugged in a value of "9.335938" and began the AutoVE process. The result was that the 'shape' of the main VE table grew to Everest-sized proportions, and in-turn my transmission was kicking like a mule pretty-much all the time. After some research I decided to try VE Scaling, and I lowered the IFR value to "8.031250", which in turn (after another round of VE tuning) lowered the main VE table enough to where the transmission was no longer acting-up.
I realize now that there are many 'downstream' tables which also need to be "scaled", including the spark timing tables. I drive the truck daily, and for the most part it's pretty driveable however it won't take more than 2/3rds-throttle without mal-combustion of some sort, and in a lot of part-throttle situations the truck acts pretty "flat", it makes a lot of noise but is gutless so I am suspecting that at a minimum my main spark table is all screwed-up.
I am facing either:
(1) map-out all the other related tables and rescale them too, then proceed with tuning;
(2) keep the scaled IFR/VE tables I have, and rent a load-bearing dyno and completely map-out the timing table;
(3) abandon the scaled VE idea, and start over.
So my questions are: Should I continue on the path I have chosen and scale all these other tables too, if so has anyone else compiled a list of tables I need to rescale? Or is "VE Scaling" a flawed approach?
Thanks,
Mr. P. :)
I'm stuck, and I could really use some feedback on my tuning approach; vehicle is 2003 Silverado SS (LQ9) w/ Paxton Novi-1500 supercharger, 72# injectors, ARH longtubes, and 3000-RPM converter. Tune is COS 3, CLSD with 2-bar MAP sensor.
The first step I took was to calculate the new IFR for the injectors - the stock value was "3.179688", and using Marcin's IFR spreadsheet I plugged in a value of "9.335938" and began the AutoVE process. The result was that the 'shape' of the main VE table grew to Everest-sized proportions, and in-turn my transmission was kicking like a mule pretty-much all the time. After some research I decided to try VE Scaling, and I lowered the IFR value to "8.031250", which in turn (after another round of VE tuning) lowered the main VE table enough to where the transmission was no longer acting-up.
I realize now that there are many 'downstream' tables which also need to be "scaled", including the spark timing tables. I drive the truck daily, and for the most part it's pretty driveable however it won't take more than 2/3rds-throttle without mal-combustion of some sort, and in a lot of part-throttle situations the truck acts pretty "flat", it makes a lot of noise but is gutless so I am suspecting that at a minimum my main spark table is all screwed-up.
I am facing either:
(1) map-out all the other related tables and rescale them too, then proceed with tuning;
(2) keep the scaled IFR/VE tables I have, and rent a load-bearing dyno and completely map-out the timing table;
(3) abandon the scaled VE idea, and start over.
So my questions are: Should I continue on the path I have chosen and scale all these other tables too, if so has anyone else compiled a list of tables I need to rescale? Or is "VE Scaling" a flawed approach?
Thanks,
Mr. P. :)