1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Highway RPMs seem high?

Old Oct 6, 2013 | 12:44 PM
  #11  
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Originally Posted by No_chip_92
Any sure fire way to check rpms besides another tach? I don't think it could be out almost 1000 rpm, but then again it does spin off the alternator..

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Well, I changed the fluid, filter, adjusted the bands on the tranny and bumped the line pressure a bit and now it seems to run 2300 or so. There were very very few metal shavings in the pan, and the fluid was in tip-top shape.
Is your tach compatible with the factory tach harness? I have mine wired into there and it works great.
 
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Old Oct 6, 2013 | 10:09 PM
  #12  
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It's an autometer diesel specific tach, I'm going to see if I can get BD diesel to read my idle rpms while I'm at dyno days so I can calibrate it. May try moving around the probe too and see if that makes a difference.
 
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Old Oct 11, 2013 | 01:28 AM
  #13  
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On my tach I had to adjust it up abit to get it where I thought idle was. On the hwy it seems pretty correct. Untill its in od then it seems to read really low, but I have 3.07's
 
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Old Oct 20, 2013 | 09:33 PM
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A little update, I dynoed the truck at bd dyno days, with the mods in my sig the dyno showed 205 horse .. Sound on par with my sig? Don't think so. I'm thinking the TQ is pooched.. Can anyone recommend a good quality TQ that won't totally break the bank? Not on the best budget unfortunately!
 
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