Last weekend I towed a 32', 13K Montana 5th Wheel, from Boise to Seattle which has several good, steep passes. It's the first time I've towed anything heavy with all the mods in my sig which I did specifically for better towing performance and I thought I would share a few things. First, PHP tunes are great and using the 40 HP setting, I could hold the Blue Pass, Deadman's Pass and a couple other's just as steep at 60 MPH and my EGT's held right at 1250 and only barely went above that on the steepest grades. I saw just over 19lbs boost but with my boost fooler, it was actually closer to 25. My trans temps never went over 190 and usually sat right between 165-175. My RiffRaff billet wheel wasn't noisy at all, but my 6637 intake was. And although I never noticed any drone with my Walker muffler before, at lower RPMs, 1800-1950, which is 55-59 for me, there is a slight drone. Fortunately, with my 4.10 gears, I'm usually around 2000-2050 RPMs so it's irrelevant. Anyhow, I was really happy with my mods and I got the best MPGs that I have ever seen while towing heavy.
One other thing I wanted to share related to bad fuel resulted in EXACTLY the same symptoms another OP had earlier this week. I got some bad fuel and the truck started cutting out momentarily with the WIF, SES, and Wait to Start lights all coming on briefly but when I let off the throttle, everything was back to normal. My alt light never came on and I was monitoring ICP, IPR, boost, voltage, trans temp and EGTs. Nothing was ever abnormal when it cut out so I figured it was either my chip or bad fuel. Although I'm not 100% convinced yet, after two days and 100 miles of normal, incident free driving after filling up and using a double dose of "Howes Lubricator", I'm definitely leaning towards bad fuel.
One other thing I wanted to share related to bad fuel resulted in EXACTLY the same symptoms another OP had earlier this week. I got some bad fuel and the truck started cutting out momentarily with the WIF, SES, and Wait to Start lights all coming on briefly but when I let off the throttle, everything was back to normal. My alt light never came on and I was monitoring ICP, IPR, boost, voltage, trans temp and EGTs. Nothing was ever abnormal when it cut out so I figured it was either my chip or bad fuel. Although I'm not 100% convinced yet, after two days and 100 miles of normal, incident free driving after filling up and using a double dose of "Howes Lubricator", I'm definitely leaning towards bad fuel.