Curious questions

[rraccerr]

(02-28-2019 )Rawze Wrote:  

(02-28-2019 )rraccerr Wrote:  2014 t680 with a ISX 15 400 Cummins. Two questions i would need help with.

1. My sweet spot on my rpm meter is at 1300 rpm. That’s where I keep my engine running over the road. But I read that an ISX should be kept at 1650-1800 to get best performance, is this true? And if so, should I forget about that sweet spot indicator?

...

there is no "sweet spot". 1300 is too low rpm for pulling power (when you need a lot of boost). it is better to have it in higher rpm range - 1660 or so when pulling hard. - When not pulling hard, it is better to use the lower rpm.. it changes with loads and terrain and requirements.

http://rawze.com/forums/showthread.php?t...8#pid24378

Thank you!
I’m assuming you mean to keep it at 1660 when I’m loaded on flat terrain, but curious as to what rpm when not pulling hard. Seems like I ask a lot of questions, but I want to learn.
By the way, thanks for what you created.hats off!