ISX Horsepower/Torque setting

[Rawze]

(09-19-2022 )TBraun Wrote:  Got a couple questions. I bought this 2000 International 9900ix truck with the ISX engine in it. Obviously all pre-emissions. The data sticker on the engine shows it a ISX600/1850. The previous owner said he thinks the engine was de-rated at one time because the engine was running rough, they told him it was set at 565. This would have been many years ago. He said he had it on a dyno afterwards and it had 450 at the wheels, he couldn't remember the torque reading. He asked why it was so low and they told him because you loose that much to the wheels. That seems like a lot of loss, but maybe that's right. If I get Insight hooked to the engine, with it show me what the HP and Torque settings are? Or does it just show the program numbers? Also, what kind of boost pressure would/should the engine run if it was around 550 hp and full load? The truck doesn't have a boost gauge, but I'm adding one. It has a waste-gate turbo, so obviously it's not going to be above what it's set to, I'm just wondering where they should run.

It will show the HP/torque. If it is a CM570 ISX engine then it should have about 36-psi boost under full operating load. And by the way, in regards to the ISX, more boost does not make more power .. it only causes accelerated wear and increased friction in the engine.

If you are not sure what program belongs in it then sign up to cummins.quickserv and look it up. Its free.

As far as a dyno goes.. it depends on the gearing of the truck. If it has a tall set of rear end gears than it can loose up to about 18% or so of the flywheel power at the wheels. If you want to improve it then a better set of rears is always a far cheaper solution with much better performance results than trying to turn up the engine and wearing it out faster.