I am interested in having a play with a 4x4 Octavia to make it into a stealth machine, say as far as it will sensibly go on standard transmission and internals. My Scooby is running 434 BHP and 395 lbft, 0-60 3.9, 0-100 8.7, 0-125 12.1 all in the wet with a passenger in full road trim and used daily, and I am interested in looking at the Octavia as a future project. FWD is not an option and I prefer the stealth look of the 4x4s.

A few questions:

1. What is the reliable torque and power limit for the 4x4 transmission as stock?

2. Any user tunable reflash software or aftermarket ECUs?

3. What size injectors as stock? Is the fuel pump up to the job?

4. Any kits to bolt on a Garrett GT25? What is the preferred turbo in the 300-400 BHP range?

5. Need a brake upgrade and suspension drop at least to be the equivalent of the vRS. Suggestions?

I would think that the engine mods needed would be intake, turbo, exhaust, ECU at least, possibly intercooler, injectors, fuel pump.

Hi, and welcome to Briskoda...

Some of your questions can be answered HERE

a IHI turbo conversion will see over 300bhp on standard internals, but im not sure how the 4x4 drivetrain will cope, but apparently its almost a straight swap to drop in the TT gearbox and haldex.

Hope you get this thing built... it will be a monster

A few questions:

1. What is the reliable torque and power limit for the 4x4 transmission as stock?

260hp 250lbft any more and the box starts to break

2. Any user tunable reflash software or aftermarket ECUs?

plenty..

3. What size injectors as stock? Is the fuel pump up to the job?

you need rs4 pump fpr and injetors.

4. Any kits to bolt on a Garrett GT25? What is the preferred turbo in the 300-400 BHP range?

lots of options..

lots

5. Need a brake upgrade and suspension drop at least to be the equivalent of the vRS. Suggestions?

exp on 4x4 but do-able re brakes.... susp KW v3.

Talk to Stuart J

re the engine.. there is no prob with 350 on stock internals bt 400 is pushing it. The haldex will not hadle it.. neither will the TTs unit - its the same.

The 6 speed box is stronger but i would look at a quaife diff and cold treatment..

John Banks!!!!! in a Skoda........ now we've arrived...

Any user tunable reflash software or aftermarket ECUs?

(Skoda)Tek 2.5 anyone

LOL there won't be anyone on scoobynet in six months they will all be on here driving Skodas

we should have a swapped Scoob for Skoda head count.

Thanks for the replies. Didn't realise the gearbox was so limiting, not just a Scooby problem then. Is the TT gearbox really only

Hello :wave:

Is the TT gearbox really only

Given that the 4X4 gearbox costs

Given that the 4X4 gearbox costs

The going rate for the used gearboxes is about 250-300 dependent on miles/cogs...

As for looking higher up the range the engine is the same the box is still weak the haldex will still need changing - till you get to an S4.... then you are buying a hole bag of out of warranty / age related probs - not to mention an extra 300kg to lug about.

Why not come along on 24th of April bring the scoob see if it can live with the Octy on track then decided. Am sure both RS and 4x4 owners would be happy to let you have a lap or 2 in the left seat!

BTW, Denis: is there a 6-speed 4x4 gear-knob mentioned in your catalogue? I'm sure they do one for other markets.

Yes - at

Wouldn't be a replacement for the Scooby, more a slightly more sensible daily driver as I have a larger turbo coming for the Scooby which should get it to 500 BHP and 450 lbft comfortably, but reliability is an issue - I'm getting a second 2457cc engine block to build up for when the original pops.

with the greatest respect, ffelan is making uninformed guesses, fact is we do not 'know' what the haldex or 4x4 gearbox will take as no one has got to those levels yet.

Hmmm, don't want to be a pioneer on another car. The S4 route does look enticing.

Welcome aboard John, it is nice to have another expert on the board!

Steve

There was a RS4 on www.rs246.com for sale privately for

Another S4 Link to look at:

http://www.ktrperformance.com/gallery/Project_Cars/KTR_S4/s4_gallery_01.htm

Now thats what i call a turbo, imagine the sound!!! (off to try and find a video clip:D)

Doh, the videos are on the site:D

Thanks Phil, someone who has taken the hit on the mods instead of me for a change would be nice

Prawn's one sounds just like the sort of thing I would be looking at. Need to have a think.

I can't comment on reliability or every day use of a tuned S4, but sounds like a cracking car though.

If it wasn't for insurance i would probably be driving it myself!

John

Octavia 4x4 transmission is short geared so 150 appears as you go into the red in top, I have calculated as best I can that this is a tadge over 140 actual.

I would not be confident trying to but big horsepower through it but there again has anybody actually tried ??

If you change the box to a TT225 the clutch would be worth grabbing as well, I think the Starter motor & flywheel may also neeed looking at as I have been told the std 4x4 ones may not match.

Im currently running 228 bhp from just a remap, absolutely no other engine mods & the car feels quicker than the Scoob (STI 3, 292 horses at Powerstation) You dont get that long legged wind up the scoob had. Some of this may be aided by the shorter gearing

The beauty is that I can thrash the **** off it & nothing breakes, the Scoob blew once for me & again a few months after I sold it.

I have also changed the Brakes, AP 4 pots + 335x32 discs

With higher compression and an extra half litre the Scooby has no real lag now, so I think I know what you are getting at about real world torque in any gear, I think the 1.8T engine is so much more efficient, as well as spooling up a decent sized turbo early.

The Scooby just did just both head gaskets because the head studs had slackened off. After parts were sourced it was a week off the road which was inconvenient, and I only recently sold my old Pug 406 runabout. I am hoping that I have ironed out the unreliability now, but will have to see. Hence the thought of another car.

At 228 BHP how useful is 4x4 over FWD on the Tavia chassis? My 194 BHP V6 Pug did not have good traction in the wet :(

At 228 BHP how useful is 4x4 over FWD on the Tavia chassis? My 194 BHP V6 Pug did not have good traction in the wet :(

depends on how good you are with fwd... and depends how many of them horses you are trying to use at once.....? 4x4's are quicker off the line but they are shorter geared as well.... when you are rolling then the diff is less apparent ... but cornering feedback is poor on the 4x4 so some say its easy to push hard in the vRS?

Trouble I have with fast, heavy FWD cars is that the weight transfer feels wrong to me when you run lots of torque. You open the throttle and the weight transfer is rearward and you have just unloaded your front where you are hoping to get traction. There seems to be no way to tighten your line mid bend without lifting off?

Does the vRS have a limited slip diff? If not, is anyone running one?

For turbo kits with GT series Garrett turbos, go to www.atpturbo.com. I have a T3 S60 ball bearing from them and with some minor mods to the downpipe, it's been really reliable. I run 20-22psi on a daily basis (91 US octane at 2800m altitude makes around 230hp to the wheels). Their best turbo kit is probably the GT28RS (GT25 is good for like 250hp) with the exhaust manifold, downpipe, etc. However, the kit has no software. You could get a custom remap done though, or pull a few tricks and have it work like mine on k03 software.

Jabba also makes a good kit, but it's way overpriced. The GT28RS kit goes for like USD2,000, that's a LOT less than Jabba. It does require do-it-yourself mentality though.

Regarding the 4x4, I think people are too conservative, but if you don't want to be a pioneer... The S4 makes a bunch of HP, but it's a heavy car. with 450hp (k04s to the limit), a 350hp Octavia will give it a hard time if traction is not that big of an issue. I've heard of people running 400whp out of a VR6 using the stock FWD trannie on the Octavia, with no real issues. That's with drag racing. Jabba, however, claims 320ft.lbs to be the limit. I'd say go for it as long as you're not drag racing, the trannie should hold up.

Does anyone know what other VW has this trannie? We could look up in other forums to see what other people have found to be the limit.

Also, I'm running a peloquin LSD. That thing rocks. No more tire squealing for no reason, even with my T3 at 22 psi. I'm running GY F1 DS2 tires 225x17. I can step on it full gas on a turn and the car just sticks to the ground with minor squeaks from the tires. Traction with the LSD seems to be a problem above 250whp (300bhp) and smaller turbos like the K04 or the GT28R, that spool up below 4kRPM.

Speedy G

the Octy RS uses the O2J box IIRC.. and im sure several of our more experienced members will beable to comment on the reliability. TaviaRS had snapped a mainshaft or two, and Badger5 also eventually killed the box on his 340bhp ibiza. and Ffelan killed his at anglesy