Is anyone running the proflo 4 on a 426 stroker or something alike?. What map and settings are you using and what have you gotten out of it in terms of HP and torque?
I have built a 426 stroker out of a 360 mopar engine and installed a proflo 4 EFI system on it. The car is running okay but at the dyno the power graph seems less smooth than what I had before with the carb (EFI lines are in RED, the others are from the carb). I wonder if I choose the right profile cam. I have a Hughes engines SER3842ALN-10 (cam card is here -->
http://www.hughesengines.com/Upload/..._2015/3842.jpg. Let me know if you think it should be mild or race just to make sure I set up the wizard correctly.
I used the recommended settings from Hughes in regards of timing, idle, etc. and modified it during the dyno run session (about 4 hours) but could not get it to perform better than that. In the street the car feels strong but expected a larger improvement (RED lines in the dyno graph) from having slightly larger valves (2.02 to 2.08 intake), ported the Edelbrock performer RPM heads, installing 1.6 ratio rockers instead of 1.5 and swapping the Edelbrock 1411 carb for the pro flo 4 EFI (had an edelbrock performer air gap intake before).
I set the idle timing to 18 degrees during the weekend instead of the previous 15 it had, feels much stronger since you press the accelerator.
Advance starts at 1300 RPM (idle set to 1050 RPM). Total spark set at 33 degrees with full advance at 2800 RPM.
Surely a dumb question but what happens if you increase idle timing further?
WOT AFR target 12:1
Cruise AFR target 13.3:1
Idle AFR target 13.5:1
pump shot 99%, duration 3 seconds, otherwise it leans out a lot (+17 AFR) when going WOT and takes a long time to go down, not reaching the AFR target.
This engine likes gas, if I put it leaner feels like it does not pull, respond as well when pressing the accelerator. When set like this it reaches AFR target all right.
Important to mention that the car was dynoed at 4500 ft above sea level, with 91 octane pump gas.
Edelbrock reccommends using the 5016 map. But how do I hand pick the 5016 base map?. Also, the 5016 map according to the manual says its for 331-380 cu with very low vacuum, mine is 426cu and vacuum at idle (1150 RPM) according to the proflo data is 15-17 inches. Fuel pressure is 47.9 psi fuel pressure, I have the Edelbrock fuel tank sump kit that was installed as it came out of the box.
I got response from Hughes yesterday on how they would classify this camshaft, is mild or race, the answer was kind of in between street and race, this is their answer: "It is more of a middle of the road cam used in a lot of stroker application."
I have driven the car about 400 miles after the EFI was installed. Feels better now than when I ran it at the dyno.
Thanks for your feedback
.
