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VF 2 ls3 ssv. Custom tune + otr 246rwkw.

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Jackel, Apr 13, 2019.

  1. Jackel

    Jackel Member

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    Hey guys!
    After a custom tune & otr my VF2 ls3 ssv made 246rwkw. Stock was 218rwkw.
    To me this doesnt sound right, sounds pretty low but i could be wrong.
    What does everyone think?
     
  2. lmoengnr

    lmoengnr Well-Known Member

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    Still have the factory headers, cats and exhaust?
     
  3. Jackel

    Jackel Member

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    Yes! At the moment still have factory headers, cats & exhaust but will upgrade to a full h&m/harrop exhaust at end of year.
     
  4. 07GTS

    07GTS Well-Known Member

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    look at the gains not the number the actual gain is average to what people get from those mods, most others start higher and end with same gain its just different dyno calcs
     
  5. abuch47

    abuch47 Active Member

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    not that it matters but sounds low for stock ls3
     
  6. Jackel

    Jackel Member

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    Im assuming another 20rwkw gain with headers+ cats + catback?
     
  7. EYY

    EYY Well-Known Member

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    I just had a ‘280rwkw’ ls1 retuned on a dyno dynamics dyno. Baseline run was (from memory) at 206.9rwkw and retune bought it up to 222.6rwkw with heaps more torque across the board. Fuel trims were way off so fuelling was adjusted.

    Tuner said that the 3.9 diff gears was the reason for the lower reading and that the baseline run would’ve been over 250rwkw on his dyno if it had 3.07’s and no histall.

    Ive had and driven ‘250rwkw’ stock ls1’s with just intake, exhaust and tune and they don’t go as well as this one. Went up against a w375 pack ssv and very easily walked away from him. He actually approached us and asked what had been done to it afterwards.

    Dyno figures and Kw ratings don’t mean all that much at all - Dyno’s are just a tuning tool after all and figures are easily manipulated.

    Apparently the best way to get high readings is to strap them down loosely so that under acceleration, the rear tyres climb up onto the front roller so that they’re not contacting the rear roller at all.
     
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  8. 07GTS

    07GTS Well-Known Member

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    the whole strapping down is due to the lesser hp cars if u strap them down too hard they will show less hp from the contact load, the higher hp cars have to be strapped down as tight as u can get cos otherwise the spin the tyres, as long as the tyres are on the roller the only affect can be tyre pressures changing the diameter, if dyno operator uses different gear and adds it to the dyno calc then it will read same, but most don't change calc to suit gears so it reads slightly off
     
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  9. Ryan_044

    Ryan_044 New Member

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    That gain sounds about right for those mods but the actual figure does seem low - could just be the dyno. Whereabouts did you get it tuned?
     
  10. Jackel

    Jackel Member

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    APS! Luis is a very experienced tuner so no issues there!
     
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  11. Jackel

    Jackel Member

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    What do u think about doing headers + cats + retune for next upgrades and leaving the catback stock so it can be quieter? Will i lose much kw & torque?
     
  12. 07GTS

    07GTS Well-Known Member

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    headers and cats are good to do it gets the flow out and the rest will be fine it will keep torque low and very quiet all u really need is stock rear mufflers to keep any sounds down for cruising then with throttle sounds good
     
  13. Jackel

    Jackel Member

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    As long as the higher flow due to the headers + cats doesnt disintegrate the stock catback mufflers over time.
     
  14. 07GTS

    07GTS Well-Known Member

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    it won't be any worse then a totally stock exhsust, i ran headers into 2.5'' then into stock rear mufflers with 14 psi boost for few years without issue
     
  15. EYY

    EYY Well-Known Member

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    When mine was done, tach input wasn’t hooked up and variables weren’t changed. It was an older dyno so maybe a factor.

    It was strapped down HARD. Said he straps all cars down the same

    Plan to take it to the drags early may anyway. Should give a bit more of an indication I spose
     
  16. Gotta_Drive_1

    Gotta_Drive_1 Member

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    I have found that a real general rule of thumb that OTR, EXHAUST & HEADERS + tune upgrade will generally give rwkw of whatever flywheel kw was. As an example a 260kw L77 with those upgrades becomes roughly 260rwkw. Not sure if this still applies to 6.2L. Maybe someone that has had said mods could confirm if say a 6.2L LS3 Clubby at 317kw flywheel would go to roughly 317rwkw. My 2012 VE SS UTE went from 260kw standard to 269 rwkw and its easy to see why when the stock headers come off!!!, they belong on a go cart and would probably still choke that!.
     
    Last edited: Apr 14, 2019
  17. Geoff6666

    Geoff6666 Member

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    Yep, that's what I got. L77 270fwkw stock.Now makes 270rwkw with exhaust otr and tune. Also running E85.
     
  18. abuch47

    abuch47 Active Member

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    No not quite those mods will not turn flywheel into rear wheel unless your tuner is really good a fudging the numbers. Like others have said the increase in torque across the rev range is more important as with gains in anything other than WOT.
     
  19. 07GTS

    07GTS Well-Known Member

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    im not sure with others on dyno but when i got mine done to get the proper torque figure we had to run the dyno at a set speed/gear and then input that engine rpm into the dyno so it could make the correct torque calculation, the track will always show a lower calc hp then the dyno because the dyno can hold 100% of your torque/hp and then let it go, thus with the quarter unless u can get down at 100% throttle for 100% of the run u wont show a true figure, thats where so many big hp dyno cars dont get the quarter numbers, i always say put 15" stockies on a pro drag car and then see what number it does... it wont equal its engine hp
     
  20. EYY

    EYY Well-Known Member

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    I’d use 1/4 mile times to compare between stock and modified ls’, not necessarily to work out power figures

    1/4 mile times are a much better indication of a street car’s overall performance imo. Comparing dyno figures is like comparing apples to oranges - unless doing back to back runs on the same dyno.
     
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