Truck makes less power with SO pump

dieselpolaris

dieselpolaris

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Apr 23, 2009
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I put my truck back on the rollers yesterday after putting an SO pump on it and I made 70 hp less on the first run and could only get within 10hp of my best run with my HO pump which was 553 by turning my p®ogrammer down to level 7. Am I overfueling my hx35 over a 475 twin setup or what? I'm confused...
 
You are definately way overfueling that thing!!! You did 553hp with a HX35? Over top of what?
 
With my HO pump drive pressure was at almost exactly 1:1 but my gauge is plugged up so I need to get it working again to check... If drive pressure went up a lot with that extra fuel would that choke it off that much? Truck only runs around 1300 degrees on a long pull...
 
dieselpolaris said:
With my HO pump drive pressure was at almost exactly 1:1 but my gauge is plugged up so I need to get it working again to check... If drive pressure went up a lot with that extra fuel would that choke it off that much? Truck only runs around 1300 degrees on a long pull...
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I've never had twins, but I'd say hell no it can't be overfueling that much. Not with a S475.
 
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