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choosing the right cam type and settings in the tuner for a Mopar SB 426 stroker

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  • choosing the right cam type and settings in the tuner for a Mopar SB 426 stroker

    Hi, 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 have driven the car about 400 miles after the EFI was installed. Thanks for your feedback
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    Last edited by Ivan Baez; 08-14-2020, 04:26 PM.

  • #2
    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?

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    • #3

      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.

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      • #4
        feels better now than when I ran it at the dyno.

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        • #5
          Important to mention that the car was dynoed at 4500 ft above sea level, with 91 octane pump gas.

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          • #6
            Try 5016 base MAP.

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            • #7
              Thanks, how do I hand pick the 5016 base map?. Also double checking, the 5016 map 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."

              WhatsApp Image 2020-08-17 at 9.22.03 AM.jpeg

              WhatsApp Image 2020-08-17 at 9.22.08 AM.jpeg
              Last edited by Ivan Baez; 08-18-2020, 09:33 AM.

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              • #8
                " Try " meaning see if it likes it or not. Easy to switch back & forth.
                " you state engine Likes Gas".....

                Goto Ecu Settings > Load Map > follow prompts > then power cycle key switch as instructed.

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                • #9
                  excellent, appreciate your feedback, will certainly give it a try and post the results, thanks

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                  • #10
                    Hi, I tried map 5016, the engine did not like it. It bogged from mid to high range. leaned out, short term adjustment was all the way up.

                    I went the other direction (I was running map 5030 originally), and chose map 5034 instead, what a difference!. The short term compensation has a much lower value, and the engine is much more responsive, no more slight bogging so far under heavy acceleration. AFR gos into target AFR much faster. Could it be due to the ported heads with larger valves and higher ratio rockers?.

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                    • #11
                      This weekend I was messing around with the tune, since I installed an MSD shift light and was trying to get it to "turn on" at 6k RPM in the road, hahaha.

                      with map 5034 I still noticed a slight hesitation at high RPMs and saw that sometimes the AFR was around 13-13.5 instead of 12 which is what I set it at (I was running map 5034). I decided to load a another map to see if that corrected it, and after trying around other 3 maps I ended up with map 5037 and that one really nailed it. Map selection can get confusing because your setup may not meet all ranges in the edelbrock guideline table, so thats what messes things up I believe.

                      In my case I have a mopar small block (360) that has a 426 stroker, hyd roller 238 cam and aluminum ported heads with 2.08" intake valves, I guess that changes all the airflow characteristics of a stock engine with just a cam upgrade. Despite the mods I get a pretty good vacuum at idle (16-20) because its roller type and the profile can be more agressive. Very pleased with the results, the car fells a lot stronger now because it goes instantly to 12's on AFR on full throttle.

                      It would help a lot if the app could log data or be able to actually see whats going on while driving the vehicle and to be able to send it to tech support, etc. The phone app should be able to do that easily, are there any plans to get this done?.

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                      • #12
                        Map selection is best Matched to Hot idle Vacuum readings 16-20" in. Hg.= Mild cam MAP

                        5037 = mild cam MAP.

                        Pleased , you have tuned your rig , to best potential...

                        No, plans for data-logging @ this time.

                        Too busy , to get IOS implemented........

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                        • #13
                          Originally posted by 2700 Cast View Post

                          Too busy , to get IOS implemented........
                          IOS app is coming??

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                          • #14
                            Originally posted by 2700 Cast View Post
                            Map selection is best Matched to Hot idle Vacuum readings 16-20" in. Hg.= Mild cam MAP

                            5037 = mild cam MAP.

                            Pleased , you have tuned your rig , to best potential...

                            No, plans for data-logging @ this time.

                            Too busy , to get IOS implemented........

                            Data logging on the Android or IOS app should not be that complex, you are already receiving the data from the ECU in order to display it in the app screen at the gauges. It would be agreat tool for both the user and also Edebrock for trubleshooting issues and provide remote assistance. Take care, There are interfaces that already have it, for example I have a JB4 chip from burger motorsports on my bmw x6 and they have a similar phone app interface and bluettoth communication with the JB4 ECM but that one has the log option. If you google it you can see what I mean. Take care.

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