Opinion , How mush boost hp do you run on pump 91?
 

I used to get 93 around here but, all I can find is 91 now that I have her running again.
Would run 18-19 psi back in the day but , thinking about 15 psi and low 400s sounds like a good place on 91 pump that contains 10% ethanol.

Opinions?

if you have it tuned right (ie engine sees proper AFR's all the time, not too much backpressure etc etc) 15psi shouldn't be a problem. depending on where you end up with the tuning metrics, more is possible

I agree that 15 shouldn't be a problem, though I tend to tell people to stick to 13 to cushion for Murphy's Law. 14-15 is when I suggest some sort of aux injection.

I run I believe 15-17 psi on EU-95 which should be equal to your 91 rating.

boost doesn't say shit about hp though. Mine is at 400 with all the specs that I run, yet a more modern turbo at same boost should result in better numbers

Thanks for the feed back.
My wastegate just dumps straight down so that helps with back pressure. Keep my AFRs rich and knocked a few degrees off timing.
At 11 psi right now and feeling good about 4-6 more.