CM870 Turbo Boost
04-30-2023, (Subject: CM870 Turbo Boost ) 
Post: #1
CM870 Turbo Boost
Hey everyone, I have an 06 International 5600I tandem dump truck with a stock tuned, mandated recently installed CM870 long block. The truck has an Allison RDS six speed transmission. The truck runs stronger than ever and gets better as it breaks in except in one situation. When I’m climbing a long steep hill in fourth gear the engine pulls strong with around 32psi boost at around 1600 rpm’s. When the transmission downshifts to 3rd gear on the steepest part of the hill my RPM’s go up to around 2000 but my boost drops to about 22psi. It seems to me the boost should go up instead of dropping. This is a brand new Cummins OEM VGT turbo. Before the new motor I used to never get below 40mph fully loaded on these same hills but now I’m down to 30mph! In every other situation besides these longer hills the truck is stronger than ever. Any ideas?
Thanks, Terry
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Messages In This Thread
CM870 Turbo Boost - Hemiterry - 04-30-2023
RE: CM870 Turbo Boost - Rawze - 04-30-2023,
RE: CM870 Turbo Boost - Rawze - 04-30-2023,



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