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Thread: Cylinder Select?

  1. #21
    Joe (Moderator) joecar's Avatar
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    I read that Crane Cams and Comp Cams can custom grind you a small block chevy cam with alternate firing order (so all you have to do is change the order of the spark plug wires on the distibutor); the reason you may want this "marine" firing order is that some people say it has better "intake balance and/or exhaust header balance (...something about 2 adjacent cylinders firing in sequence messes up tuned header design)", and "promotes better cooling".

    So... thinking out loud, I'm wondering if it's possible to change the firing order in the LS1/LS6 PCM and get a alternate firing order cam ground...?
    :?:

    You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.

  2. #22
    Forum tyhee Site Admin GMPX's Avatar
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    Quote Originally Posted by joecar
    You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.
    Yeah, just swap the wires!!, (I'm not kidding here!!).
    As far as the PCM is concerned, it is just firing outputs A - H, how they are hooked onto the engine is upto the engineers.

    Imagine running an old 455 Pontiac on an LS1 PCM

    Cheers,
    Ross

  3. #23
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    Quote Originally Posted by GMPX
    Quote Originally Posted by joecar
    You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.
    Yeah, just swap the wires!!, (I'm not kidding here!!).
    As far as the PCM is concerned, it is just firing outputs A - H, how they are hooked onto the engine is upto the engineers.

    Imagine running an old 455 Pontiac on an LS1 PCM

    Cheers,
    Ross
    Yah got me thinking Ross , We converted the shop 68 Firebird to Delco injection and stroked it to from a 400 to a 462 a few years back , may be time to upgrade the PCM and chuck a 4l80e into it - nah darn site easier to chuck a spare LS1 and a blower onto it than to do the conversion.

  4. #24
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    Spare LS1 and blower Delco? What are you running in the Monaro now then?

    And if the blower is spare send it up my way. I have a pesky silver clubbie to beat which means I need to drop from 13.0 to 12.7 somehow.

  5. #25
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    Quote Originally Posted by jsttry
    Spare LS1 and blower Delco? What are you running in the Monaro now then?

    And if the blower is spare send it up my way. I have a pesky silver clubbie to beat which means I need to drop from 13.0 to 12.7 somehow.
    I have a few spare LS1's laying around , no blowers though at present I sold my 2.4l whipple and are still awaiting the 3.3l whipple to turn up.

    Monaro at present is running a the same bottom end as always - a 383ci 224 cammed daily driver The 3.3l should liven it up a little

  6. #26
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by GMPX
    Quote Originally Posted by joecar
    You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.
    Yeah, just swap the wires!!, (I'm not kidding here!!).
    As far as the PCM is concerned, it is just firing outputs A - H, how they are hooked onto the engine is upto the engineers.


    Imagine running an old 455 Pontiac on an LS1 PCM

    Cheers,
    Ross
    Ross, mate, you're pure genius...

  7. #27
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by GMPX
    Quote Originally Posted by joecar
    You could casually drop "...oh yeaarh, I changed my firing order..." in your converstions... he he he.
    Yeah, just swap the wires!!, (I'm not kidding here!!).
    As far as the PCM is concerned, it is just firing outputs A - H, how they are hooked onto the engine is upto the engineers.

    Imagine running an old 455 Pontiac on an LS1 PCM

    Cheers,
    Ross
    And you'd have to swap the injector wires also too, eh.

    455 = big cubes -> big torque

    455 + PCM = bigger and wider torque

    (I wonder how big torque will be below 2000 RPM...? )

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