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Exhaust mods for Motorsport, possibly Director & Magnum

Discussion in 'VF Holden Commodore (2013 - 2017)' started by duaned, Oct 27, 2017.

  1. monstar

    monstar Naturally as-pirated

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    Additional research to hand:
    G0A9XTQ copy.jpg

    Above is to scale with bolt alignment. So it is possible if you cut the flange...:(
    It occurred to me while fiddling around with this, where on the vehicle would you put a device to collect 75% of all the heat generated by combustion energy? Possibly the worst place for a shitty device, replace with proper unit for $500 and bolt on HSV headers. Tune in-tact, oil cooling works better than stock.
     
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  2. monstar

    monstar Naturally as-pirated

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    True, header design is actually about performance, essentially catback is about sound...
     
  3. 426Cuda

    426Cuda SUBLIME!

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    That's a lot to cut off. Could you cut, rotate left say 30° and re weld?
     
  4. blackve76

    blackve76 Well-Known Member

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    Farout that is so close to exhaust you'd think it would be a oil heater
     
  5. 426Cuda

    426Cuda SUBLIME!

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    And yet it works.
     
  6. monstar

    monstar Naturally as-pirated

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    Smart thinking, cut pre-flange, slip on joiner extension. Weld seal top, band clamp to cat pipe. Sort of excellent opportunity to replace that section with stainless mandrel and HFCs, which flange immediately after...
    42C6846A-A321-4DCC-82BE-906E3A3BA055.jpeg
    Cut off problem header flange and the top flange of this, weld join, voila.
    That’s to use HSV headers and retain HX.
    BUT
    If you don’t already have HSVs I suggest using the PH5387 long tube tri-ys which do clear and perform much better through the rev range. Easy peasy.
     
    Last edited: Oct 31, 2017
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  7. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Or just buy headers that fit.
     
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  8. panhead

    panhead Well-Known Member

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    What is the operating temp for your oil and how much does the temp increase when the engine is under load?

    I guess we'd also need to know what the temps are for the LS3's without the cooler to be able to compare the difference.



    .
     
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  9. LS1SS

    LS1SS Active Member

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    Ok where does one get nice cats like the one pictured above? Some muffler places in Syd want a fortune to make them up and want your car as well,I would just like to buy over the counter take home and fit to my HSVs.
     
  10. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    I've tried to get Manta to make a bolt on HSV cat but they say there's not enough of a market for them to warrant jigging them up.
     
  11. blackve76

    blackve76 Well-Known Member

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    That would be interesting to find out data, I'd ceramic coat header for peace of mind.
     
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  12. 426Cuda

    426Cuda SUBLIME!

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    Always an option. But, it's the potential warranty issues stemming from a tune...
     
  13. 426Cuda

    426Cuda SUBLIME!

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    Above my pay grade sir. ;)
     
  14. 426Cuda

    426Cuda SUBLIME!

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    https://www.pacemaker.com.au/header...e-vf/commodore-ve-vf-6-0-6-2l-v8-tri-y-detail

    They do look good hey. Interesting how different the left and right headers are. I guess they're tuned length?

    Re the HSV headers. I was thinking simply oxy off the existing flange. Clean up, rotate and re weld to same length? Also thought about opening up the cats. Insert similiar diameter 200cpi then re weld. It might sound like a lot of stuffing around. But the udea of retaining OEM (Albeit HSV) look on my MSE appeals to me. Probably still cheaper than going after market and no warranty issues...7 years is a long time!
     
  15. panhead

    panhead Well-Known Member

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    No problem, I just thought if Holden took the time to fit an oil cooler for the limited editions then they may have also taken the time to add an oil temperature gauge of some sort to compliment it.



    .
     
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  16. panhead

    panhead Well-Known Member

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    I can understand why you'd like to retain a more OEM look to the car but would a change to the exhaust cause a warranty issue for anything other then the exhaust itself?

    I would have thought the tune to make the exhaust changes worthwhile would cause the issues.



    .
     
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  17. Sabbath'

    Sabbath' Redblock Jesus

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    Probably had leftovers in the parts bin of the coolers, but not the extra binnacle gauges like when they had the leftover taxi shells for the gts-r.
     
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  18. panhead

    panhead Well-Known Member

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    Or even if they wanted to be cheap and not fit gauges they could have just switched on something in the display to give a digital reading.


    .
     
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  19. monstar

    monstar Naturally as-pirated

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    Would it surprise you to know that the Engine Oil Temp is a calculation not an analogue to digital sensor reading?
    My take on it is that it was specified on the L77 for the Police Pursuit Vehicle, for warming oil for emergency starts in friggin cold countries like they have sump warmers plugged in on fire engines. PPV obviously had a limited production run, plenty of overs, and marketed as an oil cooler. It clearly is not that!
    At best is an oil temperature stabiliser but I'd say given our country and the header location, I would not rate the cooling capability of that heatsink in that location over 100º.
    Having said all that, heating the oil more quickly might make for less clickety-clack cold start knock on startup.
     
  20. 426Cuda

    426Cuda SUBLIME!

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    Interesting. Maybe it has a dual effect?
     

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