5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

increased EGTs/with new fuel plate

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  #1  
Old 08-17-2009 | 03:59 PM
mrjeep44s's Avatar
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Default increased EGTs/with new fuel plate

I just completed a cummins swap into my 93 chevy c3500,I wanted more power so I added a #5 fuel plate.It dam sure does what its supposed to.The power difference was very noticeable.My problem is that my egts went sky high to 1400 degrees with my foot mashed to the floor.The motor is out of a 98 freightliner with allison 545. 4" exhaust from ss diesel and a cold air intake. There is no intercooler because there is no room.motor is stock otherwise with only 80,000 miles. Before installing the new TST products fuel plate the egts would get to 1200 degrees max. Can I adjust the fuel plate or star wheel to help.Also can I use the stock chevy diesel elec. fuel pump and bypass the transfer pump on the cummins? All input would be greatly appreciated.
 

Last edited by mrjeep44s; 08-17-2009 at 04:53 PM.
  #2  
Old 08-17-2009 | 06:15 PM
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slide the plate back, and/or slide the afc housing back
 
  #3  
Old 08-17-2009 | 11:14 PM
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IF you want to keep the power without the intercooler, a water/meth injection would help alot. But other than that, pull back the plate and drop the power
 
  #4  
Old 08-18-2009 | 09:14 AM
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The plate was installed using the guide provided in the kit.It is in the stock location of the stock fuel plate.Do you mean move back towards firewall,and if so how much.I was also told that the stock 3/8" fuel supply line is to small for the cummins.Is it true that this could cause the motor to run lean and create heat? That is why I was thinking of remounting the elec. fuel pump that originally fead the old 6.5td. This is my first diesel truck and my first engine conversion so I am still learning.Without the people on this site I would not be were I am today.Thanks to all for your help and support.
 
  #5  
Old 08-19-2009 | 11:44 AM
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Diesel engine theory is opposite to Gas engine theory.. Running a diesel lean is not hotter but the opposite, cooler. Gas engines typically have air/fuel ratios less than 17:1 where you can run a diesel to 100:1 and would benefit more from it. Heat in a diesel is too much fuel, rich mixture, late timing, bad head gasket, etc. If you have the mechanical lift pump working on this engine, then leave it be. The electric pump won't be enough fuel pressure for the P7100 pump. And industrial injector pump will behave differently than the automotive version with a plate and require some special attention for setting the timing etc. as the lift tables on the net don't apply.

Moving the plate back toward the fire wall is reducing fuel/power. Moving the plate at 0.010" increments would be my recommendation.
 
  #6  
Old 08-20-2009 | 06:34 AM
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Thanks lildog for your input.I will try moving the plate and see if that will work.Rick.
 
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