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Thread: Holden 355

  1. #1
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    Default Holden 355

    My car was on the dyno yesterday & the tuner rang & told me that he could not rev the engine past 5200rpm under full throttle but could rev it past under light throttle ,the engine is a 355 efi single throttle body on a harrop single plane manifold , factory Bosch dizzy , upgraded coil , pugs are gaped at 1.5 mm , it has good fuel pressure , the tuner seems to think its electrical any ideas on what the problem could be ??

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    been here .......too long Smitty2's Avatar
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    .. post moved to correct forum area
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    Sure why not? 76lxhatch's Avatar
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    Knock retard? The person to troubleshoot it would be the tuner, he has all the info in front of him...

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    Do you ever leave? paulzig's Avatar
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    Could be the ignition module, but like these guys are saying the tuner has it all in front of him so its easier for him to troubleshoot...

    If its not electric, its either fuel pump, valvesprings etc...

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    Part of the furniture Deuce.'s Avatar
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    Thinking outside the box here, but maybe an airflow issue? What heads &cam?
    Probably an ignition breakdown (leads/coil/module etc).
    If it was fuel your tuner would know it's gone super lean.
    Or Paul has got it with valve springs. Do you know what springs are in it?

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    You can hear valve float on the dyno. Spark plug gap is pretty big I would bring it in to at least 1.0mm. What plugs? Double check ignition then, probably just needs more intense spark. But as everyone said should be pretty basic for a tuner to diagnose

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    Do you ever leave? immortality's Avatar
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    If it will rev past the same point under part throttle I doubt it would be valve springs. Air/fuel/spark. Tuner should have some idea what the AFR's are doing (or I hope he does). first things first change plugs and reduce the gap and do another run. Also can't hurt to cover the basics, plugs, leads, rotor/cap etc Also need to monitor fuel pressure through the run, just because it has good fuel pressure at idle doesn't mean it will under full load (ask Duece, he knows ).

    Was watching a youtube video the other day of some cars drag racing, this one car was breaking up at the top end. Problem was found to be the alternator not keeping up and letting the system voltage drop to much effecting the ignition system and dropping spark. Depending on what efi software he's using he should have a log which should have enough data to narrow down the culprit.

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    The cam is a cc-288 solid crane , the heads are ported Vn heads , the motor was built for someone else by Ivan Walker here in Sydney . I have spoken to Ivan about the engine & he reassures me it has been built properly . The thing is the motor was carby I then converted it to injection . The only thing I changed were the plugs AC delco double platinums gapped at 1.5mm & the cap & button every thing else came off a running engine that ran perfect . I might change the leads as they are pretty old my bad .

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    Also it's running the factory delco computer & factory harness which has been in the car for 10 years I had no problems what's so ever until I put the new motor in .

  10. #10
    Do you ever leave? immortality's Avatar
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    What fuel pump does it have?

    What throttle body are you using?

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    run the plugs at 1mm see what it does, friend of mine has the same problem we closed the plug gap and it pulled to 6800 no problems
    Last edited by alffie; 02-07-2019 at 09:46 PM.

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    Run these plugs Ngk bpr6ef 1mm gap. this happens a lot in another model of car same problem at highish revs/boost. 5 times out of ten it is aftermarket/platinum plugs. The other 5 is aftermarket ignition coils each cylinder but you don't have those lol. You can use the iridium version if you keen. Get some new leads as well, be surprised if its not that but anyway.
    Last edited by CircuitVK; 02-07-2019 at 10:05 PM.

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    Part of the furniture gtrboyy's Avatar
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    Who was the tuner?

    Surely the tuner would have some idea what issue could be or where to look.

    Voltage or spark issue is possible if alternator or coil is not up task.Mine would

    Hopefully something simple.

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    First the fuel pump is a Bosch bfp070 external & AC delco low pressure in tank , throtle body is a 1000 cfm efi hardware item with V6 super charged Bosch injectors . The tuner tried his ignition module & it the same thing happened , the AFR,s were good , he tried blaming the dizzy but he thought I had a Chinese made Bosch item & it is not as I bought a genuine Bosch dizzy from Holden a long time ago & it ran well in the old engine & I only had the dizzy in the old engine for about 3 to 4000 kms before I changed to this combo.

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    How's this for a thread dig haha

    https://www.aussiev8.com.au/holden-v...-question.html

    Plug gap should be 1.0mm -1.1mm max

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