2350 - Help with stationary high load application

[Rawze]

(05-14-2021 )CTS2021 Wrote:  Thanks for the quick responses guys.

One of the ESNs: 80186307

These X15 units my question refers to are bone stock but operate in an offroad environment and de-mandating is acceptable.

The pump performance test I am quoting the HHP numbers from puts them at 1650 rpm, all things being equal. We cannot exceed 1650 rpm in the field as that is all our hydraulic system will happily accept over long periods of time.

I will work on getting Insite for real datalogging, but for the time being the remote throttle request is maxed and engine load will not go over about 90% on the in-dash readout. And for what it's worth they also will never exceed ~90% on that readout on the offroad movement from site to site.

The nature of the work is that we don't get to choose what RPM we work at, it is operation specific and we try our best using the Allison and 1:1/2:1 box to put the engine in the ideal operating window.

Given the constraints I am working with, I guess to be clear my goal is that I'd like to find the best tuner/shop out there to increase the performance (in the right way) across the entire RPM window.

1650 is where you want that engine to run under high load applications. It will last its longest there.. so, at least you have the right rpm for the engine.

As far as the engine goes. According to that ser#, your supposed to have program HD10389 in it. That program is advertised at 565HP/1850 torque. Here is the actual torque curve of that program however...


(right click and choose "view Image" for a larger picture).


As can bee seen in the screen shot, at 1650RPM, it is programmed to produce 532 Horsepower to the flywheel.

90% throttle would be roughly 477-478 Horsepower output to the flywheel.

- Lag in the gearing accounts for up to about 12% - 15% of the engine output, so this puts it at roughly 405 - 420~ish HP out of the gearbox and into the hydraulic system.

- Now you must account for lost heat (friction) in the drive-line/gearbox, etc. and in the hydraulic system.. and your likely not too far off from what you estimate.