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Adapting LSx PCM/wiring harness to 351C

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  • Adapting LSx PCM/wiring harness to 351C

    I am helping swap a 351C into a 66 Mustang and my brother in law wants to convert it to EFI. I know there are other options out there (megasquirt, fast, aem, bs3, etc.), but for the cost that you can find a LSx PCM/harness + the fact I already know the HP Tuners platform makes this more attractive.

    From what I can see I'll need to figure out a way to mount a 24t reluctor to the crank (along with mount a sensor to read the reluctor), and I'll need to mount a cam sensor/trigger to either the cam gear (with the sensor through the cam cover) or modify the distributor to become a cam sensor.

    All of the other sensors seem pretty straight forward, ect, map, etc. The plan is to either have fuel injector bungs welded to his current single plane 4150 intake manifold or see if there is an existing 351C efi single plane. Then mount a 4 barrel throttle body to that (which should have tps and iac sensors). Then we'd mount the coil packs on the firewall.

    I am sure you guys who are running MS, BS3, FAST, etc. have to come up with solutions like these to operate the computer, so I am looking for the easiest route.

    The stock ls2 timing cover has the sensor going through it like this:

    The stock ls2 cam gear has the half circle tooth on it like this:

    So if we could modify the stock dizzy to have a single tooth design like this I think that might be easiest:



    If not we could possibly drill through the timing cover and mount a sensor similar to the ls2 setup and mount some type of single tooth reference for it to the cam gear like this:



    For the crank reluctor we could figure out a way to mount a 24t reluctor ring to the crank pulley like this:

  • #2
    you can do it with eec-4/mustang harness just as well...its been done before
    Ring and pinion specialist

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    • #3
      not familiar with the eec-4 tuning options. seems to me that the 0411 gm pcm (03-04) is probably leaps and bounds more advanced. i'd like to run the 351c open loop speed density and i've seen where others have adapted the system to all sorts of other v8 engines. with the plentiful supply of harnesses/pcm's/sensors, etc. and the fact i already own hptuners and am familiar with it is what makes it so appealing. i just figure a lot of these sensor issues have probably been dealt with by others (between all the aftermarket ems mustangs and all the 351c pantera guys).

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      • #4
        its also more complicated to adapt because of ind coils,triggers etc IMHO
        Ring and pinion specialist

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        • #5
          you are probably right, but seems like it'd be sweet. hptuners even allows you to select which injectors are on which bank if i wanted to implement a close loop operation.
          LSX:
          1-8-7-2-6-5-4-3
          laid out like this:
          1 2
          3 4
          5 6
          7 8


          351C
          1-3-7-2-6-5-4-8
          laid out like this:
          5 1
          6 2
          7 3
          8 4


          So essentially the firing order is actually the same, the cylinder numbering is just different.

          if you label the firing order of the 351c based on the lsx cylinder numbering you end up with:

          2-6-5-4-3-1-8-7

          if you convert this to start on the lsx's #1 cylinder you end up with
          1-8-7-2-6-5-4-3

          which is the same as the lsx's
          1-8-7-2-6-5-4-3

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          • #6
            this would mean that as long as the reluctors referenced cylinder #5 as TDC (read #5 according to 351c order, #1 according to lsx), the coil packs and injectors would all be correctly wired from the factory, you could even run close loop as the banks that each of the injectors fired on would have not changed.

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            • #7
              tweecer and moates let you change firing orders too
              Ring and pinion specialist

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              • #8
                Looks like TrickFlow makes a 351C single plane with injector bosses and fuel rail mount bosses cast into it:

                and mount one of these on top (which comes with GM TPS and IAC motor)

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                • #9
                  theyre supposed to be releasing a box for the cleveland too, I hear
                  Ring and pinion specialist

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                  • #10
                    A FAST xfi is ~1700 plus the fab, AEM is almost exactly the same, and BS3 is about 2500. They will all require fab work in order to provide the computer with crank/cam signals.

                    Here is a parts list for the 24x. Mind you the only thing you get when you buy the FAST, AEM, or BS3 is the engine management system and possibly the harness (i.e. what you are paying $300 for with the GM stuff). You'd still have to provide all the sensors, fab a crank and cam reference, buy coils, injectors, etc.

                    Computer
                    0411 PCM - http://www.eficonnection.com/eficonn...spx?ItemId=729 - $110
                    Blue/Green Factory Wiring Harness - TBD - ~$200

                    Coils -
                    Can be found on tech for ~ $75 w/brackets.

                    Plug wires -
                    If mounted on valve cover you can use OEM which can be had for ~$40 brand new

                    Cam Sensor
                    Convert a SBC 1x Distributor for 351c - http://www.eficonnection.com/eficonn...spx?ItemId=623 - $125 + Conversion
                    or just make your own conversion dizzy and use ACDELCO Part # 2133826 - $34

                    Crank Sensor
                    24x reluctor - http://www.summitracing.com/parts/NAL-12559353 - $30 and find way to afix it to balancer hub
                    24x sensor - STANDARD MOTOR PRODUCTS Part # PC278T - $25 and find way to mount it

                    MAP Sensor
                    STANDARD MOTOR PRODUCTS Part # AS60T - $30

                    IAT Sensor
                    http://www.diyautotune.com/catalog/g...tail-p-62.html - $25

                    ECT Sensor:
                    STANDARD MOTOR PRODUCTS Part # TX89 - $7

                    Knock Sensor

                    Seems a lot of the 24x guys are using the lt4 knock sensor that screws into the block (you'd drill/tap it) which is ULTRAPOWER Part # KS2 - $15
                    or if you could use the factory lsx sensor AIRTEX / WELLS Part # 5S2172 - $35
                    There are 2 Knock sensors from the factory but don't know if you have to use both.

                    Fuel Injectors
                    I have a set of 28.8lb injectors you can you, they are "shorty" style so you'd have build your rail mounts to mount the rail lower. These can support about 400rwhp at a reasonable D.C.

                    Fuel rails
                    Blank fuel rails (you'd have to drill your own holes, this would probably be the easiest way to make sure they line up perfect.
                    http://compare.ebay.com/like/2305135...Types&var=sbar - $11 per rail and you'd have to fab a mount for them

                    Fuel injector bungs:
                    http://www.racepartsolutions.com/pro...S-InjB&cat=108 $4 each, would have to drill and weld these in to existing manifold

                    Throttle body
                    4150 Accufab throttle body with IAC and TPS sensors
                    http://sdparts.com/category/accufab-...hrottle-bodies - $460

                    or
                    90mm edelbrock throttle body w/sensors - http://www.summitracing.com/parts/EDL-3864/- $360 and
                    edelbrock 4150 elbow - http://www.summitracing.com/parts/EDL-3849/- $115

                    Total:
                    Right ~$1,000 to convert 351c to 24x + fab.

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