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Has anyone fitted (F&R) upgraded diffs to the S3?

Andrew@A.L.D Mar 31, 2015

  1. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    As titled

    Im doing a major rebuild to my gearbox, it will have taller gearing, steel selector forks, bracing, 4th gear supports, ARP replacement diff bolts and much more.

    I just want to find out weather its worth the getting uprated diffs been a 4WD car with my CRC controller.

    Was told the drp box is good to have as the gears are stronger but still short and the casing will make the engine tilt forward
     
    Alex C likes this.
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  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator

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    DRP box?

    <tuffty/>
     
  4. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  5. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator

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    I have no idea what a DRP box is or what its from... I can only assume as you have mentioned it tilts the engine forward you are referring to a VF/R32 box? which I believe is 02M based anyway...

    No idea on if they are stronger... tbh I doubt it as torque is not really any different between a 1.8t and VR engine...

    As long as its the same type of 02M (later versions are a bit different) then all the internals will transfer over to a 1.8t case...

    <tuffty/>
     
  6. snowy

    snowy Registered User

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    Yes it is

    Most defineately

    I both the front transaxle and rear axle Peloquins in my car - both torsen worm gear diffs

    Blue haldex in the middle

    The results are easily worth the cost - both diffs cost me $1500 5yrs ago bought direct from Peloquin

    [​IMG]


    Don't think there's anything wrong with the strength of the gears, so I'd look at selecting the ratios you want but strengthing by using the something like the SQS syncromesh gears - these are what take the punishment - rebuild the lot into your existing casing so you know it fits with fecking about

    The steel selector fork or bracing [the brass fork] isn't it ?
     
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  7. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    It's a lot of cash. I'm not going to be doing 6k rpm larches
     
  8. snowy

    snowy Registered User

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    Power is nothing without traction though

    but the quality they add to the drivetrain is beyond just double the traction, even at low speeds you can feel the extra solidity

    Uprating the diffs is really worthwhile at any powerlevel - but at anything near 600hp you really would be missing a massive trick
     
  9. Sam_

    Sam_ Down under

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    Had the Peloquin rear and sold it before fitting :( general feeling was the front made the most difference (makes sense)...

    Epytec do the strengthening parts
     
  10. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    I'm going to go for everything I can and get the diffs. Will be fitting ERF gears so in theory it can do 200mph.
     
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  11. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    std TT stroker we built, std suspension even... amazingly launched fine.. stunned
    540bhp-410lbft
     
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  13. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    I have has a lot of wheel spin with mine when your on damp roads, you can feel the left front wheel spin a lot
     
  14. Gary_808

    Gary_808 Registered User

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    Drp box has a stronger case... only seen it in 6cylinder/vr6 bell housing though. Which obviously won't fit 1.8t.

    Ps was chatting do a guy from France at pod low 9 second mk2 golf, running standard open diffs front and rear no traction issues...
     
  15. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    open doiffs are fine for straight lines but sling it round a corner or your left or right wheels hits a greasy patch of road then the wheels light up

    Nothing wrong with trying to get more grip.
     
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  16. Gary_808

    Gary_808 Registered User

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    The evo boys are on quite a simular setup to us transmission wise, (of course the hydrualic clutch pack is in the transfer box) and I have noted that a few people seem to fit a rear diff before the front, but not entirely sure if that's for a reason or because it's easiest.
    But running diffs is very popular in them circles, that's the problem not a great deal of people get really serious about these cars and corners.
     
  17. S3Alex

    S3Alex Rarely neutral Gold Supporter

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    Quaife also make a superb torque biassing front diff which is worth a look.

    I use one in my car,and traction really has improved.
     
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  18. snowy

    snowy Registered User

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    There's a chap on R32OC with a turbo'd R32 running Quaife front an Peloquin rear

    This is the Quaife front diff

    Wavetrac also

    maybe he'd be running 8 seconds with lsd's though ;)
     
  19. Gary_808

    Gary_808 Registered User

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    When I think about it now he may be in the the 8's.. (looking for my videos) he's on full drag slicks, he isn't having traction issues so there's no need yet...
     
  20. Alex C

    Alex C Well-Known Member VCDS Map User

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    are you grabbing this from darksidedevelopments? shame there is no 5/6 steel fork from them; that's the one that failed on me - guess its uncommon for that one to fail. Have you managed to source a 5/6 steel selector fork?
     
  21. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator

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    The uprated 02M forks are VAG parts don't forget... they cost about 140 quid from TPS....

    There is a 5/6 selector too (from the same gearbox as the other two) but nobody I know that have done the upgrades of the other two forks have used them and its unknown if it fits or what modification is required to get it to fit...

    Generally speaking its typically the firsat two forks that go as they tend to get the most abuse... not personally heard of the third fork going until yours of course...

    <tuffty/>
     
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  22. Alex C

    Alex C Well-Known Member VCDS Map User

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    I should say it was the rivet that holds the fork to the shaft rather than the fork itself that failed.

    why is there a question mark over whether the VAG 5/6 selector fork fits without modification?
     
  23. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator

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    I believe the forks are actually designed for an 02Q box not 02M... I have spoken to a few of my friends in the trade that have done the conversions before as I am looking at rebuilding a gearbox myself and none have done 5/6... its not to say it won't fit but not seen it done so can't comment either way...

    I did have the parts numbers somewhere but can't find them at the moment...

    http://www.partsbase.org/audi/audi-...it-selector-fork-6-speed-manual-transmission/

    According to the above there is a mix of 02M and 02Q part numbers in the later boxes with these all steel forks... while its plausible 5/6 will fit I personally have not seen it done yet

    <tuffty/>
     
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  24. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    I'm just going to modify the 5/6th fork.. I've just got all the parts now for the box.. Only thing I need now is the diffs..Should be able to get them in a few weeks.

    A spare gearbox and diff are been soda blasted right now..

    It's a good job I'm doing all this as I found a my gearbox case has a crack in it and leaking oil on the garage floor.
     
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  25. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Yep gearbox is dead. Looks like the new engine is doing well and it still needs mapping. The box has a crack around the end so it looks like the gears have been trying to climb. Not sure if it was done on the old engine as I've not given the new engine any hight revs.
     
  26. Gary_808

    Gary_808 Registered User

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    They need a substantial end support running power, not like the Dire piece of **** sheet metal people are selling in the uk.
     
  27. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    The steel plates are ok for anything under 1000bhp I was told by bar-tech and darkside.

    The really thick chunks of aluminium are for over
     
  28. Gary_808

    Gary_808 Registered User

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    I've seen it 4 times now,
    sub 700bhp vr6 mk2 golf.
    Sub 700bhp 20v mk1
    And 1 S3 sub 600bhp but launched hard.
    and mk4 2.8 sub 600bhp.

    It's whether you want to build a box that'll last for a tiny bit more work, or end up having to re do everything.

    And a man of your calibre shouldn't have a problem whipping something more substantial up.


    Mine will look something like this to give you an idea.
    [​IMG]
     
  29. snowy

    snowy Registered User

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    any ideas how much that would weigh ?
     
  30. Gary_808

    Gary_808 Registered User

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    Being alloy not alot. Less than a 1kg I should think, maximum 2kg.
    A small price to pay to avoid bearings and shafts visiting your out the end case.
     
  31. Alex C

    Alex C Well-Known Member VCDS Map User

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    is this axial force because the gears are helical rather than straight cut? i'm guessing you wouldn't need this shaft end reinforcement at big power levels if the gears were straight cut?
     
  32. Gary_808

    Gary_808 Registered User

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    Yes.

    But the most of the gear kits worth buying now for big power (not sqs rubbish) are helical cut. As helical is inherently stronger than straight cut.
     
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  34. snowy

    snowy Registered User

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    what wrong with their stuff ?

    Not had any experience of them, but they list some nice looking kit and not found any slating via googling
     
  35. Gary_808

    Gary_808 Registered User

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    Your not googling hard enough.
    Everyone used their stuff mainly because it was all that was avaliable.
    Few customer service issues.
    As some one told me personally. 'They build/design boxes, but they don't use them or really test them.'
    They are ok for most people,
    But there's much better out there now for less.

    The likes of don octane/mp make a very nice gearkit,
    All the big power guys have swapped over.
     
  36. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Monster performance does a gear kit but still expensive.
     
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  37. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  38. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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  39. snowy

    snowy Registered User

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    They seem to work well

     
  40. antwan64og

    antwan64og Registered User

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    That annoying high pitched whine is the straight cut gears, the misses wouldn't appreciate it on the shopping run but its win win really.

    You'd just Pretend the intercom was broken and wear ear plugs so you couldnt hear the whining or the gearbox :icon thumright:
     
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  41. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Going to modify the main shaft as well to help with 4th strength too.
     
  42. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    I've run SQS since 2007, been very reliable.
    Only rebuilt this year and 3/4th were chipped, but functionally perfect

    SQS have been great for me.
     
  43. Gary_808

    Gary_808 Registered User

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    Your not exactly testing it too it's limit. (4wd launch on drag slicks with north of 800bhp+ usually over 1000bhp and with more torque from the vr style engine.)

    On a previous car build I could get 2 years of track days out of a gearbox that would last 1 rwyb at santapod,
    Shows the difference in stresses.
     

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