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Showing results for tags 'rpm'.
Found 3 results
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High rpm shifts from 1st to 2nd
Bluelemon posted a topic in 2nd Generation Dodge 24 Valve Powertrain
Hey so the truck I have is a 1999 ram 2500 5.9l cummins. lately ive been having this problem where when I come to a stop and go to take off, the truck will stay in first gear until I get rev to 2500+rpm and it will shift by itself or I can keep feathering the pedal to try and shift it. recently replaced gov pressure solenoid, speed sensor, apps sensor, I checked TV cable there is no slack in it. Ive noticed if I shut the truck off and start it back up and drive the first few stops the truck shifts perfectly fine through the gears but once I come to a few stops and try taking off it will start to stick in gears more often. Also no codes are present, any Idea of what else I can check? -
Hey guys, I have warm up mode and high idle activated with a 90 second delay, until 140°F ECT. I want to verify intended functionality. Here's how mine works. After the 90 second delay, my tach jumps up to about 950 ish. After about 10 minutes, they smoothly increase to about 1200. Does this sound normal? I'm not sure if the two-stage RPM is intended or not. I would kind of prefer to see 1200 RPM instantly when it's cold out. -Kole
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I know there are a lot of people wondering about where the "sweet" spot is on the cummins for mileage and I am here to tell you that there is no sweet spot. Speed kills. I have ran numerous tests and proven that every 5mph gain costs you 2mpg. A while back I was testing this theory and on a 70mph trip I got 21mpg, on a 60mph trip I got 25mpg, at 55mph I was at 26.6mpg. So I theorized that doing 65 on this 700 mile trip would yield 23, and I was exactly right. I got exactly 23mpg. Less RPM=less injections per minute. Less speed=less wind to push out of the way. It's simple, and it works. I know some people out their are claiming 26mpg at 70mph or something crazy like that but if thats the case, why aren't they posting 30+mpg numbers when they do 60! :confused:
