Quote:
Originally Posted by TopgunZ
Well guys, if I may throw in my opinion here. A RFS is by far superior. However, I think that the stock fuel system is actually built pretty well all things considered.
I am running E85 and as we all know I require 25-30% more fuel than pump gas. I hit 533whp DJ #'s on 9.1lbs of boost and my injectors are only at 65% duty cycle. This means they still have some left in them if I needed more spray.
I do have 1000cc ID's so this does throw in a ton of differences compared to the bosch 750's. But I feel comfortable taking these to 11.5lbs. Also, my AFR's can lean a little more and Ill still have a bit more safety with ethanol.
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See I dont know why the discrepancy vs what I am seeing then. I know on my particular car when Specialty Z was tuning it they had to stop because it was leaning out up top. Now that issue seems to have went away with a fuel pump relay, but still the loss I see in the fuel system is significant.
Are you watching your fuel pressure at all during this? I would have to go dig through my text books or google on the relationship between flow, size, and pressure but I would say just off the top that your 1000's at 65% would probably equate to somewhere around 90-100% with the 750s. I believe the relationship between injector size and flow is exponential. Again id have to do some digging to confirm.