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VF Calais V 6.0 LSD upgrade for drags

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Justin Thomas, Apr 15, 2019.

  1. SS Flo Rida

    SS Flo Rida Active Member

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    I was under the opinion that the nitto nt555r dot radials are legal here in Oz. Possibly the nt01 and nt05 also. Not sure about the MT’s I know they didnt used to be strictly legal here as it was rumoured they didnt want to pay for Aust certification but you see a lot of cars running around on them so maybe that changed. At least they look legal versus the hoosiers which are obviously slicks
     

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  2. Hq King

    Hq King Member

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    Yes I was looking at tyre sizes today and see what you mean about the lack of choice . I brought my hq about 35 years ago paid $6500 it was in mint condition with a nice 253 and traumatic I cooked the motor . Several diffs driveshafts gearbox and a lot of engines later it now has a 427 sb , turbo 350 with 9 inch . Best time 11.12 best mph 121 never been trailered raced all over nz won nz super Street oh and by the way love your hqs always wanted a 2 door always seemed just out of reach dam oh I have been following your drag racing in the ss super cool and good luck with future mods
     
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  3. Unicorn

    Unicorn Member

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    SS flo rida,at which point in the mod process did you add the 3.9 diff gears and how much time did you drop at the drags?
    I watched your youtube vids but must have missed when you mentioned the diff gear change.
    Also what revs do you sit on at 100kph? cheers
     
  4. SS Flo Rida

    SS Flo Rida Active Member

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    Cheers Unicorn

    I only fitted the 3.9s and wave track about 7 months ago and have only been up to the drags once with this set up. It dropped a tenth off my best ET however as mentioned it was nosing over big time. With the larger diameter tyres now it bring the actual final drive up to 3.68 which I think will yield another 10th or so. I’ll let you know how that goes in a couple of weeks.
    I’ll check what revs it does at 100 on my way home and let you know.
     
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  5. SS Flo Rida

    SS Flo Rida Active Member

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    it sits a bees dude below 2000 rpm at 100 kph.
     
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  6. Unicorn

    Unicorn Member

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    That's perfect imo,i don't know why everyone doesn't do 3.9 gears.
    Diff gears are very underrated as a mod I think,on a basically stock car diff gears make a pretty decent difference in acceleration and only doing around 2000rpm at highway speeds how can you go wrong. cheers
     
  7. abuch47

    abuch47 Active Member

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    stock rolling diameter?
     
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  8. SS Flo Rida

    SS Flo Rida Active Member

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    No thats with 275/35r20’s
     
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  9. SS Flo Rida

    SS Flo Rida Active Member

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    If using a standard size rolling diameter tyre 3:7’s would be about the same as the 3:9’s with the 275/35r20 tyres Im running on my A6. 3:9’s with the standard tyre size is a bit too short imo for the strip as you need to the shift into second to be exact due to 1st gear being so short. Launching in second gear is a bit too long and will cost you 4 or 5 tenths. Ive tried a heap of different combo’s over the last few years and thats been my experience anyway. I’d suggest 3:7 would be ideal for most a6 daily drivers
     
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  10. SS Flo Rida

    SS Flo Rida Active Member

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    PS the test n tune scheduled for last Wednesday night was cancelled so unfortunately I haven’t timed the latest set up. Will do asap tho
     
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  11. Unicorn

    Unicorn Member

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    Does the a6 in performance mode start in 2nd gear from a standing start if you just let the trans shift itself?
    I only have ever driven ford 6 speed autos and they start in 2nd gear in perf mode unless you shift manually then you can select first gear.
     
  12. SS Flo Rida

    SS Flo Rida Active Member

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    They start in 1st every time. My mates fgx xr8 does start from 2nd also in auto mode.
    However I shift it manually at the drags & haven’t used it in the auto modes since having the stall converter fitted a couple if years ago. That way I can shift into the next gear exactly at the best point for the next gear
     
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  13. Unicorn

    Unicorn Member

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    cheers
     
  14. Justin Thomas

    Justin Thomas New Member

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    Hi guys, thanks for all the input. I've possibly cut a corner or two with my budget and recently swapped the 2.92 out for a 17,000km 3.27 LSD... Agreed it might not last but it was a fraction of the cost of any other options and i want extractors and tune also.

    Also replaced the standard road tyres with new Goodyear F1's that are more about safety on the roads for now. I did however buy and check fitment on new 17x9 alloys (yes tight over brakes but fine). Possibly future tyre options M/T do a range that will fit these.

    I've also ordered the new Pacemaker 4 into 1's and high flow cats, pending shipment then its heading for a tune when installed.


    Winter Drags this Sunday to test diff and OTR with the new rear rubber also (track not prepped). Headers & Cats still in transit to match cat back already fitted.

    Update 9-06-19 drags today 13.4 sec with the OTR Pacemaker cat back and 3.27 factory LSD. Standard wheels and tyres. Pretty happy, looking forward to the headers high flow cats and tune. For a luxury model calais-v i'm pleased.
     
    Last edited: Jun 9, 2019
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  15. Justin Thomas

    Justin Thomas New Member

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    Hi guys, Just done some further testing on wheels this time as i know i would have found this info helpful. Info related to 19 staggered Redline SS VF Black mags with the five spoke star shape compared to Calais 19 ten spoke wheel.



    Weights of wheels: Redline Front wheel with 245-40-19 B-Stone Potenza and 3mm tread 24kg each with tyre

    Redline Rear wheel with 275-35-19 B-Stone Potenza 3mm tread 26.6Kg with tyre

    VF Calais-V 19 Inch wheel with new Goodyear Eagle F1 26.4Kg with tyres

    Note Quarter mile time did not improve on the Calais with the staggered fit wheels and half worn tyres, Best time on Staggered 13.50
    Best time on Calais wheels 13.40 (ten runs each day) almost identical conditions and weather situation. (Winter drags non-prepped track)


    Make your own mind up regards the below. Just my findings.
    Noticeably some guy had a VF S2 LS3 Ute with a Full exhaust OTR and Tune running Mickey T 285's and was running 14.00's I think he was expecting good times as before exhaust and tune he ran 14.00 but the exhaust and tune didn't alter his times at all after he fitted the M/T's.

    I read that M/Ts on a lower powered car can slow it down when the hook up, his day kinda confirmed this for me hence after my headers and tune i won't be fitting M/Ts now. He had also done about 10 passes and they appeared over half worn.
     
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  16. abuch47

    abuch47 Active Member

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  17. SS Flo Rida

    SS Flo Rida Active Member

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    Hopefully wont find out until next week. If it doesn’t it will be dam close so fingers crossed.
     
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  18. SS Flo Rida

    SS Flo Rida Active Member

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    agreed regarding MTs on a stocker or mild set up
     
  19. Justin Thomas

    Justin Thomas New Member

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    Update on my 2014 Calais V Drags

    I completed the 4 into 1 Pacermaker Headers and High flow cat install, Cat back 2.5 system was already done. Also Installed OTR and had tuned to 96 octane with results just touching 300rwkw. Diff was changed to 3.27 with LSD and decided to stick to factory wheels.

    Side note: The 2.92 to 3.27 LSD Diff upgrade was really good, well worth the change (factor in speedo needs to be calabrated, tuner required on dyno)
    For anyone looking at this option i love the change, was worried the revs would be to high for cruising but its fine. Personally wouldn't go further than 3.27 in Calais. After i installed the headers and had the tune done i feel the revs felt even slightly better when cruising. 10/10 upgrade.

    Despite the 20-30kph head wind on non-prep winter day i was super pleased running 12.92 after tune.
     

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  20. Milo 6.0

    Milo 6.0 Member

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    Wow that thing is really moving now.
    What revs are you doing at 100kph now with the 3.27 gears?
    So you got nearly half a second gain with the tune:cool:
    Id be stoked running a 12.
     

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