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Message: [QUOTE="Cold Roller, post: 704087, member: 9551"] The reason I brought up the PW and timing was that this past winter I had a unique problem in real cold weather, that is gone now that it has warmed up. It seems some of the tunes and tuners haven't set the tables to handle real cold weather and a cold truck. I will say that now that it is warm (above 25*f), the tune runs between 3-10* BTDC timing. When it was cold, it would start at 11-14*BTDC and slowly go down to about 8*BTDC at the lowest! Needless to say, at low RPM and not much AP the truck would pull incredibly hard with the timing over 10*BTDC. That was probably hard on the truck, but there was no doubt about the performance. Even at highway speed and warm engine, in real cold weather the timing was advanced compared to normal. So for most of the winter I put on a lesser tune. A similar thing was happening in the transmission. There was less slip in the T/C when doing a power run cold, so it pulled very well in 5th. Once warm temps came along, I put the tune back on, but the tune was not able to keep the slip to a reasonable level when at WOT. Too make a long story short, the dyno numbers suffered because of the slip at higher RPM and power levels. I thought my T/C was failing until I put on a different tune. Yes, he could have dialed PW back to try and save ICP, but the point is to get more fuelling and the reason for the dual HPOPs. [/QUOTE]

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