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

Andrew@A.L.D

May add NOS to 600+bhp S3.
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
 

<tuffty/>

Badger 5 Edition...Its all about the flow...
Staff member
Moderator
DRP box?

<tuffty/>
 

<tuffty/>

Badger 5 Edition...Its all about the flow...
Staff member
Moderator
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/>
 

snowy

Registered User
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

5630-1427827121-6ae3ff7efe2bb3f70bd892fe77bda5a3.jpg



As titled

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

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 ?
 

snowy

Registered User
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
 

Sam_

Down under
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
 

Gary_808

Registered User
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...
 

Gary_808

Registered User
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.
 

Alex C

Well-Known Member
VCDS Map User
steel selector forks, bracing, 4th gear supports, ARP replacement diff bolts

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?
 

<tuffty/>

Badger 5 Edition...Its all about the flow...
Staff member
Moderator
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/>
 

Alex C

Well-Known Member
VCDS Map User
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?
 

<tuffty/>

Badger 5 Edition...Its all about the flow...
Staff member
Moderator
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?

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/>
 

Andrew@A.L.D

May add NOS to 600+bhp S3.
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.
 

Gary_808

Registered User
They need a substantial end support running power, not like the Dire piece of **** sheet metal people are selling in the uk.
 

Gary_808

Registered User
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.
028bcc484cb0df2e1490b0cad19286b6.jpg
 

Gary_808

Registered User
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.
 

Alex C

Well-Known Member
VCDS Map User
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?
 

Gary_808

Registered User
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.
 

Gary_808

Registered User
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.
 

antwan64og

Registered User
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:
 

badger5

www.badger5.co.uk
Site Sponsor
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.

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.
 

Gary_808

Registered User
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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