Recent content by 1995ravens

Please help. I don't understand the math I've tried lol. I am using a diesel Kohler kdw1003 says rated 1,500-3600 rpms And pump is GP hp8040 and say 1840 rpm for 8gpm and 4000 psi. So here is my questions 1..what rpms do I run my engine.(what's best) 2..say it is 3600 rpms so then what type and...