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Thread: Needing some help getting a good starting point tune, Cammed 5.7 with 6.4L Ram Intake

  1. #1
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    Cool Needing some help getting a good starting point tune, Cammed 5.7 with 6.4L Ram Intake

    Hey guys, I'm starting to dive into the world of tuning. I am a VIP Member on HP Academy and have learned a lot about some of the basics, plus I have gone through their Applied Techniquies course on Hemi Tuning Practical Reflash, but the worked example was a bone stock 5.7L that just needed a little tweaking. They skipped over SO MUCH that I needed to learn about in the step by step process of creating the base tune. I am still trying to gather some data to figure out my injector scaling and the applicable Fuel Mass output vs pulse width so I can calculate for the IPW tables the exact delivered fuel mass, unless anyone happens to have that data for a Mopar Injector P/N 68530326AA, I cannot find anywhere a listing of it's lb/hr rating and at what PSI fuel pressure. My best guess has been 42lb/hr at 58 from the only tidbit of info I could find, but I dont trust it. I have my dealership looking for me, plus I have an email into Bosch to see if I can get specs on the injectors from them, as it it marked with their part number 0 280 158 485, but doesnt seem to be in any online bosch publication??

    Essentially what I have is a 2018 Ram 2WD Crewcab, stock bottom end 5.7L, large camshaft, VVT Lockout (so assuming with VVT Lockout, you disable NN??), 6.4L Truck Intake, 6.4L injectors PN mentioned above, Hellcat Throttle Body, long tube headers, dual 3 inch exhaust with no cats, V6 Electric Fan swap, and deleted evap system. Truck has 3.92 Gearing and 8HP70 Transmission.

    What is the list of things you start with to calculate your fueling tables, calculate your estimated VE tables, and other items to begin building a startup tune for a truck with this many mods done all at once. I know it's all about doing the math and plugging it in. But with some of the numbers unavailbale yet about the injector data, I feel I cant even calculate the Fuel Mass properly yet to set up the pulse width tables.

    Sorry for the heft of questoins goign on here. I feel like I am getting great learning info from some of these courses, but there are so many small bits of info missing, and no real direction as to the step by step process you go through to calculate what you need to set all the pertinent tables to in order to get fueling, timing, and VE very close to target using the math alone to determine each of these parameters. I dont want to learn by just following someone's "general rule is I add 5 percent to these tables, I take 10 percent of these tables", etc etc. I want to go into the table having already done the equations that tells me I need to add 7 percent to this cell, and 2 percen to that cell, and 13 percent to this cell, and the results sould put me very close, not just bunch of sneaking up on it by guessing.

    Anywone willing to take me through this journey? I can PMyou my current startup tune (It's a damn mess but it runs and drives) and a couple datalogs. Much appreciated to anyone who can get me through the steps of the process so I can start applying the lessons directly to tuning my truck the right way.
    .

  2. #2
    Quote Originally Posted by STRWAL View Post
    Hey guys, I'm starting to dive into the world of tuning. I am a VIP Member on HP Academy and have learned a lot about some of the basics, plus I have gone through their Applied Techniquies course on Hemi Tuning Practical Reflash, but the worked example was a bone stock 5.7L that just needed a little tweaking. They skipped over SO MUCH that I needed to learn about in the step by step process of creating the base tune. I am still trying to gather some data to figure out my injector scaling and the applicable Fuel Mass output vs pulse width so I can calculate for the IPW tables the exact delivered fuel mass, unless anyone happens to have that data for a Mopar Injector P/N 68530326AA, I cannot find anywhere a listing of it's lb/hr rating and at what PSI fuel pressure. My best guess has been 42lb/hr at 58 from the only tidbit of info I could find, but I dont trust it. I have my dealership looking for me, plus I have an email into Bosch to see if I can get specs on the injectors from them, as it it marked with their part number 0 280 158 485, but doesnt seem to be in any online bosch publication??

    Essentially what I have is a 2018 Ram 2WD Crewcab, stock bottom end 5.7L, large camshaft, VVT Lockout (so assuming with VVT Lockout, you disable NN??), 6.4L Truck Intake, 6.4L injectors PN mentioned above, Hellcat Throttle Body, long tube headers, dual 3 inch exhaust with no cats, V6 Electric Fan swap, and deleted evap system. Truck has 3.92 Gearing and 8HP70 Transmission.

    What is the list of things you start with to calculate your fueling tables, calculate your estimated VE tables, and other items to begin building a startup tune for a truck with this many mods done all at once. I know it's all about doing the math and plugging it in. But with some of the numbers unavailbale yet about the injector data, I feel I cant even calculate the Fuel Mass properly yet to set up the pulse width tables.

    Sorry for the heft of questoins goign on here. I feel like I am getting great learning info from some of these courses, but there are so many small bits of info missing, and no real direction as to the step by step process you go through to calculate what you need to set all the pertinent tables to in order to get fueling, timing, and VE very close to target using the math alone to determine each of these parameters. I dont want to learn by just following someone's "general rule is I add 5 percent to these tables, I take 10 percent of these tables", etc etc. I want to go into the table having already done the equations that tells me I need to add 7 percent to this cell, and 2 percen to that cell, and 13 percent to this cell, and the results sould put me very close, not just bunch of sneaking up on it by guessing.

    Anywone willing to take me through this journey? I can PMyou my current startup tune (It's a damn mess but it runs and drives) and a couple datalogs. Much appreciated to anyone who can get me through the steps of the process so I can start applying the lessons directly to tuning my truck the right way.
    .

    Yes disable NN with VVT lockouts. You'll also need to disable VVT in the tune. Hopefully you can pull a stock 6.4 truck tune from the repository from which you can pull the intake volume and injector data to add to your tune. As to the throttle body, you can get the truck running without messing with the throttle body tables at all. For longtubes, you can add 30% to the transport delay, but again, you should be able to get the truck started without that.

    There's several idle tables, and all will need their lowest values set to, probably 800, and then scaled accordingly.

    This should at least get you a truck that at least starts and runs, however surgey, so you can get it to operating temp and start doing some AFR error logging to start working the VE table. Once the VE table in the near idle to part throttle range is close, there's a lot of trial and error to get the idle smooth, and then to get tip in and part throttle to feel right.