Thread is aged like fine wine but not ancient… wanted to just drop another data point on here. TS1’s and trapping 133.x mph full weight s8 w/ extra 100 lbs in it. Dyno’d 738 whp on a mustang. Running E30-35.

It is not just the low pressure fuel pump, but also the injector duty cycle you run up against. Some of the difference here between what E content people are comfortable running is just how close they want to push it and how much slop they want to leave in for their ability to accurately blend at the pump. The ‘depends on the car’ is also as much depends on the duty cycle people limit themselves to and the weather. E.g. here we have a full 100 degree swing from hottest day in the summer to winter we occasionally see below 0F. In other areas that is only 60 or 70f.

Real compressor wheels (and thus the most correct maps) work on head (pressure ratio for a given gas) and volumetric flow, not mass flow… that is a simplification they put on the curves which includes some different assumptions. Point being when it gets that cold out the compressor wheel can move a boatload more mass flow, even more than you would think by looking at a compressor Map.

Cheers