Originally Posted by Xray
We have a return fuel system and I am currently running woody and robs fuel fix with great success. I have recentlly updated my dashdaq software and I am now able to log boost pressure tp the tenth and have found that the magic number for my car to start to lean out is 18.7 pounds of boost. I am now using this as a trigger point which means that my additional fuel will now be supplied at the right time no matter what the da since depending on the da we build boost faster or slower which made setting the trigger point very difficult.
Right you wouldn't want to trigger additional fuel pressure based off of RPM. You wouldn't get very consistant AFR with different Density alititude. If anything you would want to trigger off of the Manifold air pressure(boost) to get more accurate and consistant AFR with different climate conditions. Is a return style system needed to run with a rising rate fuel pressure relgulator?
I too notice a loss of power at the top end due to leaning and timing being pulled. I think this is the main reason I was bottlenecked at the 12.0 region at the track.
When i took car back to Eurocharged to get the tune adjusted at the top no amount of changing fuel had any effect on AFR altho i didn't experience any dangerous levels like 15/1 but it would creep into 13+ and timing would go to **** and thats when the power loss after say 5,200 rpms.
I have hit the MAP limit twice so im sure im well over this 18.7 value at which the leaning is occuring. This issue is more than likely the main reason many members with greater than 178 pullies have experience no real gains at the track.