questions about a Cummins ISM turbo

[windowrattler]

(12-23-2023 )Bearmtnmartin Wrote:  I expect that's probably what happened. The truck probably had 10 owners and i bought it for peanuts because it was thrashed. But how did the m11's regulate boost? Just defueling?

I believe you're right about it defueling to keep boost in check. I also believe that the turbo selections are made to match at full power/full fueling. Waste gated turbos and now modern vgt turbos help more in the non full load areas of boost.

One other question in my head would be is the ecm program modified by someone trying to get it to perform "correctly"?

Your engine is 425 horse. What is the turbo off of? As example the customer I looked up with the M11 celect is a 325 horse engine. The turbo would be quite a bit smaller and at max load in your engine I would think it'd be out of it's efficiency range and start to build excess heat.

Rawze is also on the right track with viewing the data but your CM570 might have drastically differently names for the parameters. I was messing with a 99ish ISL CM550 and all the parameters were more of abbreviations and the descriptions of them were poor or non-existent so it took me a bit to find the info I was after.