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Real-world Fuel Economy Gains

2010 August 5
by admin

When I was learning about Flex-a-lite, there were a couple things I heard that got me really interested in replacing the belt-driven fan on my Dodge Cummins diesel truck with an electric fan. First, a 2-4 mpg increase in fuel economy, and second, a power increase.

When I got the Flex-a-lite part No. 264 and pulled it out of the box, the instructions seemed very clear and simple to understand.  The hardest part about the install was getting the stock fan off the truck. After an hour of fighting and losing all the skin off my knuckles, I pulled out the air tools. This is what I should have done from the beginning, because it came right off.

Everything from that point went smooth, the only thing I ran into was that the factory bolts aren’t long enough after I added the spacers the spacer kit that comes with the fan for the upper mounts for the intake and coolant reservoir, so I bought longer bolts at the local parts house. Other than that fan is a good quality product to install. There a some companies out there that go cheap when it comes to installation pieces, but this is not the case with Flex-a-lite.

My first impressions were good. I expected it to make more noise than the factory fan, but found that I really had to listen to hear it over the engine. As far as a power increase I really could not tell, it did not feel any spunkier, but it didn’t lose anything either. The fuel economy is where I was really impressed, I would have been happy with a 1 mpg improvement.  But I was surprised to see a full 2 ½ mpg increase in fuel economy, which is the biggest gain I have gotten from any single item.  I’m extremely happy with this.  I had no idea the stock fan was putting that much of a load on motor.

As far as temp goes, no matter what I do, the temperature stays around 195 degrees. I have towed about a 3,000-pound trailer, gone over mountain passes and it seems to remain the same.  I have not played with the screw to adjust the temperature, but I think I could get this to drop a little if I did.

Trev Burt is a member of the technical sales team at Premier Performance. He helps customers find and match products to reach the objectives they want to achieve with their trucks. He recent installed a Flex-a-lite part No. 264 on his personal vehicle and shared his experience with us.

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