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2007 ve Berlina aloytec auto with 3.9 or 4.11 diff gears ?

Discussion in 'VE Holden Commodore (2006 - 2013)' started by Matias37, Jan 15, 2018.

  1. Matias37

    Matias37 Member

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    Hi all ,I been looking online for some time to see if some one has tried 3.9 or 4.11 diff gears for their alloytec berlina or omega 4speed auto, but I haven’t had any luck , so if anyone has first hand experience your feed back will be appreciated I have tested all my mods down the 1/4 mile and so far this is what I got.

    Ozztrack tune only 16.27
    + mace 12mm spacers and k&n air filter 16 flat.
    + rear sport muffler only 15.86
    Had a small tune change ,use to shif at 6000 rpm 1st 70kph 2nd 140kph now 1st 80kph 2nd 160kph @ 6600rpm but waiting on cooler whether to test down the 1/4.

    I think the car can run a low 15s now but it’s just a theory base on how the car feels
    With the new tune. My goal its to get into the 14s I think 4.11s will do the trick .
     
  2. vr304

    vr304 Active Member

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    Haven't personally had experience with an auto v6 VE but I can tell u that 4.11's are a very short ratio and with your 4 speed auto you'll probably hate it u may even go backwards in performance would be a lot better off with 3.7 gears maybe even 3.45 and I'm picking ur diff is a single spinner so an lsd upgrade would be wise, if your looking for more power try ditching the air box for an otr and get oz track to touch up the tune to suit
     
  3. Capsule

    Capsule Member

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    Yeah I have the 3.27 LSD (ex-police) and with an Orssom OTR, spacers, Pacemaker extractors, SSV non-AFM exhaust, no tune, it wheel spins for a split second when I floor it so I guess what you'd have issues with traction and a 4.11. As vr304 suggests, I'd try a 3.45 first, then a 3.7 and see if that makes any difference.
     
  4. harrop.senator

    harrop.senator Well-Known Member

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    Just throw 3.9s in it n be done. May not be heaps quicker down the strip but it'll skid it'd hook and arse dyno will add 20 horses.

    Had daily commodores with 3.9s they cruise at 23-2500 in the older models with 4l60s wouldn't go under 3.7 if for butt feels.

    My Caprice has 3.46 diff gears and you can sit on 130 n still pull 10 litres per hundred at like 2800 rpm. Throttle position and lean cruise does wonders.
     
  5. lowandslow

    lowandslow Well-Known Member

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    What speed are you crossing the line at and in what gear?
    In a manual you would be aiming to cross the line when your just about touch the limiter so i dont have to waste time shifting a gear for the last 50m or so. If the VE's are like the older models they would hit a wall in 3rd gear.
     
  6. harrop.senator

    harrop.senator Well-Known Member

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    With 3.9s you'll be shifting into third at 135 kph @ 6600
    With 4.11s will be 125 kph @ 6600
    Seeing as you already have a 3.27 if 3.45 are available for zf I wouldn't bother the difference is minimal.

    You'll just be changing into third crossing the line as I'm assuming you're trapping at what 140, 145 over the line?

    May slow you down may be quicker. Those motors like to be over 5k. The fact it'll get to limiter quicker may help it pending how bad the torque drop is when it clicks third.
     
  7. Matias37

    Matias37 Member

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    Thank you for your thoughts guys ,
    Harrop senator is on the money that's why I'll go 3.9 and lsd I calculated 1st 67kph 2nd 134kph 3rd will be engaged at 134 give or take. I'm looking for a new lsd diff.For the 15.86 the speed was 143.5 kph it just had shifted to 3rd at 140 .Im going back 28/3 and if I can manage a 15.2 I'm going to go ahead with the 3.9 lsd , realistically for what I have read the diff change can net a .4 - .6 gain and that should translate hopefully to a 14.8 .
     
  8. Matias37

    Matias37 Member

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    Well didn’t go according to plan last night but ended up with a pb of 15.743 not the 15.2 I want it but to be fair it was a hot night 27c compare to 16c when I ran the 15.86 I’m going back in July maybe I’ll have the 3.9s by then.
     

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  9. mike_nofx

    mike_nofx Active Member

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    I’ve gotta ask... if you enjoy drag racing, why stick with the 6?
     
  10. Matias37

    Matias37 Member

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    why not? You can enjoy drag racing with any car , what I enjoy about it is experimentig with new mods and beating my own times , I’m also on a low budget , but most importanly I love my big fat berlina
     
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  11. Matias37

    Matias37 Member

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    OK 3.9s and true track center are going in on the 12/7 it'll be a couple of months before I break it in since I don't drive a lot .I think i'll star a new thread about how the car drives since it looks like im the only on this forum to have done it.When I have the box retuned im going to raise the shift point while im at it to 7000rpm from 6700 so it'll shift at the factory speeds 1st 70kph 2nd 139 so I'll get the full extra 19.2% power and torque advantage at speed, or close to it at least.
    After all is done this is going to be the lengths of the gear compare to stock .
    1st 70, 2nd 69 ,3rd 70 or close to it ,after 1st 58 2nd 46 and 3rd 37 .
     
  12. harrop.senator

    harrop.senator Well-Known Member

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    Where does the hp fall off on the curve atm and where's peak hp and torque?
     
  13. Matias37

    Matias37 Member

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  14. Antmiller

    Antmiller New Member

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    I've had no luck even finding anyone in nz to fit 4.11 gears into my r8 anyone else had same trouble?
     
  15. harrop.senator

    harrop.senator Well-Known Member

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    Nope. Most the kiwi boys bang their own diff gears in I know surely someone in the country has a trade cert on it. Ve I'm assuming?
     
  16. vr304

    vr304 Active Member

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    Steelie gears in Auckland will build your diff for you he’s one of the best out there when it comes to diffs
     
  17. VTS5

    VTS5 TechJunkie

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    We do'em all the time. Did one today actually.. All B /N,, 2.92 out, 4.11(Motive) with TT (Harrop) in.
    We also have Genuine in the box 3.45 LSD's
     

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    Last edited: Jul 7, 2018
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  18. Tonner Matt

    Tonner Matt Well-Known Member

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    I want to put a Truetrac and a set of 3.9's in my VZ 1 Tonner
    But as yet I haven't decided on whether to buy Genuine Dana or Motive Gears
    Price is not my concern either as both brands of gears are basically the same price anyway

    What's your opinion on the quality of the Motive Gearsets ?
    What do you guys commonly use or prefer .... Motive or Genuine Gears ?
     
  19. VTS5

    VTS5 TechJunkie

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    What ever the customer requires... Motive, Richmond or Genuine.. We stock both Motive and Genuine.But mostly use Motive.
     
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  20. Tonner Matt

    Tonner Matt Well-Known Member

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    Thanks for that mate. Appreciate the feedback
     

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