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About DougIrby

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  • Name
    Douglas Irby
  • Location
    Lexington, Texas
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  • Drives
    2015 Silverado C1500 DC 5.3L w/E85 and Max Tow
  1. E85 makes a very noticeable difference when towing a travel trailer. When towing, I would be willing to pay more for E85 than I would when not towing.
  2. I've been thinking about doing this. It's expensive, so I have to wait until I get the money to do it. I was wondering how the resale value of my truck would be impacted by a supercharger. Anyone have an idea? Would it be a foolish thing to do, financially speaking?
  3. I don't suppose a Chevrolet dealer is allowed to do warranty work on a GMC? I don't have a GMC dealer within 50 miles of where I live, but I do have a Chevrolet dealer nearby that has a first rate service department. I'd like to get such discounts on a new Silverado.
  4. I've been researching this topic and it seems that normally aspirated engines, like the ones we have in our Silverados, loose 3% of their power for every 1,000 feet in elevation gain above sea level. When driving in the mountains of Colorado this can mean we loose over 100 horsepower at elevations aproaching 10,000 feet. That is significant, especially when towing up a grade with a trailer. Engines that have forced air induction, like the Ford Eco Boost, do not loose hardly any power at higher elevations, from what I read. What to you folks thing about this information?
  5. I wonder why recovery hooks come standard on 4WD and not on 2WD, which needs them more than the 4WD's? I wish I had them on my 2WD. Maybe I'll buy a pair and install them. Never know when I may need them.
  6. I prefer to run E85 in my truck in order to get the horsepower boost from 355 to 380, especially when towing my travel trailer. It also runs cooler and cleaner than gasoline, and pollutes the air less than gasoline. Therefore, when I can find E85 at 75-80% of the price of regular gas, I buy it. The closest E85 that is priced right is about 55 miles from where I live. Therefore, I fill up 5 gallon gas cans with E85 to put in my tank at home or when I can't find E85 at a good price. E85 has an octane rating of more than 100. Our Flex Fuel Silverado's have a sensor that detects the octane rating of the fuel and advances the timing when high octane fuel is detected, providing more power.
  7. We will be taking a trip to DC this Fall and going up on the Blue ridge Parkway. I'll test it out at that time...but that will be at much lower altitudes than Colorado.
  8. I'm not sure about that. I like to keep my RPM's at 3,000 or lower. Perhaps if the speed limit was low and I kept the PRM's at 5,000 plus it might do the speed limit. All I know for sure is that I wish I had more torque when I am in the high country going up a grade. I was spoiled by pulling a 5th wheel trailer with a Duramax diesel. If I could afford a 3/4 ton Duramax LTZ that is what I would use to tow.
  9. I have a 2015 5.3 w/ max tow pkg and flex fuel. I try to run E85 every chance I get in order to get the added power the high octane fuel provides. I am light footed on the gas and my truck stays in V4 about 85% of the time, all the way up to 75MPH. I have no problem with it. Most of the time I have to look at my instrument panel to see what I am running, V4 or V8.
  10. When towing a trailer the weight is not the only factor to consider. Just as important is the frontal area of the trailer. If you are towing a boat, you have very little frontal area. If you are towing a travel trailer you have a lot of frontal area. That makes travel trailers much more difficult to tow than a boat of equal weight. Also, where you tow is a factor. If you want to tow in mountainous areas where the elevation is high you will loose about 2% of your towing power for every 1,000 feet in elevation above sea level. I tow a 5,000 pound (fully loaded) travel trailer with a 2015 Silverado 5.3L with the MAX TOW PKG (3.73 rear end), rated to tow 11,200 pounds. When I get it in the mountains of Colorado, my speed going up the mountains is about 25 MPH at 3,000 RPM in M3. If you are going to tow in the high mountains I recommend a max trailer weight of no more than 70% of your maximum towing capacity.
  11. I ordered some Bilstein stocks for the front of my 2015 Silverado 5.3L Double Cab with Max Tow Pkg, then called Bilstein and asked about installing them on my truck. They told me to send the shocks back because, while they would fit, they were not calibrated for the NHT trucks. This was about a year ago. Therefore, I still have OEM shocks on my truck.
  12. Has anyone changed their shocks on a 2014-2017 Max Tow Package (NHT) Silverado? The Max Tow Package shocks are different from the shocks on other trucks. I don't think Bilstein makes shocks that they recommend for the NHT Silverado. I would like to reduce the bounce I get in my truck when towing my travel trailer and go over an undulating area of highway (due to the ground shifting underneath the asphalt). I went to Tire Rack and they have some shocks for the NHT Silverado trucks. Anyone notice that? Anyone bought those? I forget the brand but they cost over $100 per shock.
  13. I have a 2015 5.3 with NHT and flex fuel. The shocks on the NHT are not that great IMHO. However, running E85 is the cheapest way to boost your power, from 355 HP to 380 HP. You will get about 20-25% less fuel mileage on E85 but the much higher octane will be detected by your sensor and it will advance your timing, giving you the added HP. The higher power is easily noticed, especially when towing. I tow a 5,000 pound (when loaded) Lance Travel Trailer and I wish I could get E85 everywhere I go, but it's often unavailable. So I carry three 5 gallon gas cans to buy more when I get the chance. At high altitude, our engines loose power and if towing in the mountains the engines don't have enough power to satisfy me. I am considering adding a supercharger, and would appreciate any advice from anyone who has had one installed.
  14. A larger fuel tank would be a nice option. However, once you get old your bladder needs emptying more often than your truck requires a fill up, especially when the wife is with me.

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