Audi A6 Avant 2.5 V6 TDI Quattro

[fjtwelve]

?
The boys at HQ in Roche are fine
Whats the problem?

 

[RogerM]

I'm following this thread with much interest as I am just about to purchase a V6 TDi Superb and am looking at what can be done to improve her power wise. Great to see people tuning the V6 TDi in the UK.

 

[adamss24]

I'm following this thread with much interest as I am just about to purchase a V6 TDi Superb and am looking at what can be done to improve her power wise. Great to see people tuning the V6 TDi in the UK.

For a start, a good remap or a propper tuning chip will change the way the car feels and goes. If you go for more, expect the clutch to go quick as the FWD isnt that great for traction. When i say a propper tunning chip, i mean one like Steinbauer or PSI Motorsport and not a "resistor-in-a-box" from ebay ! My a4 quattro will embarass many petrol engined cars and the way the diesel pulls when its on boost, it makes you grinn !

 

[RogerM]

Oh I'm fully converted to diesel for day to day road going passenger cars, my B5 Passat caused a few upsets with the boy racers round my way(turbo, nozzles and map gave 167PS & 382Nm on an AFN lump).

I'm looking at trying to get the most I can 'use' out of the Skoda and as much as I'd like an A4 quattro I simply can not justify the doubled asking price.

I think I will be fine with just FWD as most of the use is motorway cruising or towing, I have other cars for track work and playtime

It's always interesting to see what other people's experiences are as there are a lot of options out there and some are obviously much better suited to the job than others.

I work as a design development engineer for a major diesel FIE manufacturer and can tell you that many of those "black boxes" you see on e-bay are the scurge of the industry and have been directly responsible for many warrentee claims, I'd always stay away from such things.

Right off to research some more V6 TDi information (and to work out how to afford an A4 quattro )

 

[fjtwelve]

Turbo is back with Turbo Dynamics, waiting for info.

 

[fjtwelve]

TD says:
confirm that the VNT mechanism was jamming in operation due to damage to the veins themselves. What appears to have happened is the exhaust wheel itself has failed (fatigue most likely) and the pieces of this have impacted the VNT veins causing damage.

The turbine wheel itself is the original item fitted to the turbocharger from the factory and was not changed when we upgraded the units back in September last year, with this in mind we cannot repair the unit under warranty as the warranty covers our parts and labour and does not extend to the lifespan of original components…we can replace the turbine wheel with a brand new item and fit a replacement VNT mechanism as well as giving the unit a full overhaul,

Joy. Anyone any experience of this happening?

 

[Rub87]

strange... are you sure they didn't 'clip' the wheel?

 

[fjtwelve]

The spec sheet refers to modifying the turbine wheels but is not precise about what they do. I have asked for more details and photos.

 

[INC]

TD says:
confirm that the VNT mechanism was jamming in operation due to damage to the veins themselves. What appears to have happened is the exhaust wheel itself has failed (fatigue most likely) and the pieces of this have impacted the VNT veins causing damage.

The turbine wheel itself is the original item fitted to the turbocharger from the factory and was not changed when we upgraded the units back in September last year, with this in mind we cannot repair the unit under warranty as the warranty covers our parts and labour and does not extend to the lifespan of original components…we can replace the turbine wheel with a brand new item and fit a replacement VNT mechanism as well as giving the unit a full overhaul,

Joy. Anyone any experience of this happening?

You need to check exhaust manifolds for cracks. Sometimes small metal parts from manifold go into turbo .

I see its many times.

 

[im570rm]

this is exactly what happend to my turbo last week,a small metal part from manifold shaved 3 blades from the exhaust wheel .

 

[adamss24]

Sorry to hi-jack the thread, does anyone how good is the GT 2359V as fitted to the renault espace 3.0 dci (v6 engine) ? Looks a big motha compared to the VNT 20 and its pretty much plug and play. Its also oil and water cooled. Here are some pictures:

 

[Fez]

hi Chris, what is the part number on that turbo and which year was the car?

 

[Fez]

I think that's a GT2559V Chris.

 

[mojogoes]

Hi fez hows this project coming along

 

[Fez]

hi steve, nothing really happening at the moment, cars been standing for 6 months because of a ban on my license, 150mph somewhere on the a406, now got it back so i need to do a service, change discs/pads for some larger ones, one of my springs is broken so gona put some eibachs.

Then hopefully chris will help with the turbo upgrade etc

Do you know anything about this GT2559v turbo off the renault?

 

[fjtwelve]

"150mph somewhere on the a406" - beautiful throwaway line there, like it. Have accumulated 9 points somewhat less dramatically bloodi cameras having to be extra vigilant.

Car is back, picked up on Good Friday so no one around to explain whats been done so will chase up tomorrow. Not had chance to drive much but plenty of torque and power so mechanically we are back on track i think. Still smoking under load below 2000rpm especially in upper gears so more mapping still to go. Travel arrangements may prevent getting much more done before we drive to Germany in 10 days but i'll try. It does rev to 4900-5000 by the way.

 

[voodooke]

hello , i see u all talk about +300ps out of a 2.5tdi V6 .. but i don't see any testresults of this ?
i got my 2.5tdi V6 BDG 163ps now on 260ps and 487NM ..
now they told me that there is not much air enough ..
any suggestions ?

greets from Mitch

 

[diffas]

If there is lack of air you need bigger turbo or need to raise the airpressure. What's your setup atm?

 

[Rub87]

hello , i see u all talk about +300ps out of a 2.5tdi V6 .. but i don't see any testresults of this ?
i got my 2.5tdi V6 BDG 163ps now on 260ps and 487NM ..
now they told me that there is not much air enough ..
any suggestions ?

greets from Mitch

Maybe the heads/manifolds aren't flowing so well?

I'm getting 400Nm at 2000rpm and 260hp/600Nm at 3250rpm, 280hp max due lack of fueling with 2260vk on 2.0tdi 8v..

with 2.5l displacement and 3 times the valves one would expect at least same spool characteristics..?

 

[voodooke]

If there is lack of air you need bigger turbo or need to raise the airpressure. What's your setup atm?

the turbo is custom made by Finturbo GT2260V with large injectors and BMC carbon airbox , don't know the pressure of the turbo now ..

@rub ,if u see the inside of the intake,it could be possible ..

i'm searchin for someone to make a custom intake ,from the throttle until the intakemanifolds

greetss Mitch

 

[Mikkijayne]

Its the heads. The inlet manifold is just a box - there's nothing in it to cause any restriction, but the port design on this motor is just horrible. Tiny little valves and very narrow twisty ports.

 

[voodooke]

Its the heads. The inlet manifold is just a box - there's nothing in it to cause any restriction, but the port design on this motor is just horrible. Tiny little valves and very narrow twisty ports.

how sure are u about this ?

Thanks From Mitch

 

[fjtwelve]

Kill or cure. Set off tomorrow to drive to Munich. Garmin updated with all latest maps and speed traps. New front brakes and discs fitted. Recovery insurance organised.....

 

[Mikkijayne]

Good luck!

I'm keeping my A6 but I'm binning the AKE in favour of a tweaked AHU

 

[devonutopia]

Good luck!

I'm keeping my A6 but I'm binning the AKE in favour of a tweaked AHU

If you want any help I am local. Although, I don't know a great deal about the AHU. Can provide vagcom support if nothing else. Am in Exmouth.

Actually, just realised I probably directed you to this forum in the first place 3 years ago.

 

[fjtwelve]

1 week, 2600 miles, ave 62mph, max 145, 29mpg, 1L oil, its a motorway gobblin monster with the midrange to see off most things from 50-120 but stilll too much smoke. We're all in one piece but have given Celtic enough info to choke a horse so more remapping next week. Achtung more beer

 

[fjtwelve]

Pulled the fuelling down 10% across the whole map. Less smoke everywhere, smoother not so raw, more driveable below 2000rpm, still pretty rapid to 100 but maybe less so above that, haven't really been able to check yet. Fuel economy seems up to around 32mpg, not enough miles to really check yet. Need another dyno run.

 

[fjtwelve]

Smoke is easy to get away but we also have the idle shudder with R683 nozzles.
If you find the 'Laufruheregelung' bits in the AKE hexdump please let me know .

Well curiously the shudder is now disappearing on its own. It will happen sometimes at start up but if left to idle will now often disappear. Once warmed up this is more likely to happen. It still shudders if you stop in a queue at stop lights after driving for a while but after a few minutes of stop start driving or tootling around town it goes or almost goes away.

Smoke still occurs if you open the throttle too much at below 2000. In the first 3 gears the gearing is so low you don't really notice any lag, but from 4th up you can feel that it starts to pick up at 1600rpm or so, and by 1800-1900 is starting to pull. Stuck in a slow moving line of traffic it will cruise happily at 1000rpm in 6th, but you wont accelerate off anywhere fast. Over 2000rpm in any gear it is just immediately responsive. Its not as quick as it was but does not smoke and is thus less antisocial more relaxing to drive. It revs very smooth and my driving style is changing to take advantage of this, I am holding on longer in the middle gears because there is enough power to carry on. I suspect i have lost top end power but haven't had the opportunity to check.

Despite this fuel economy has improved to 30mpg in local driving fron the 26mpg or so it was (Imperial not US). As soon as i get on to dual carriageways it jumps to 32, and i'm sure there's more if i can keep it below 80. This is what i used to get in the unmodified engine driving the empty roads in Scotland so pretty pleased to get the same using the extra 90hp on the busy Cornish lanes.

I will dyno it again next month.

 

[Rub87]

do you think the shudder is the same phenomenea like in 1.9 tdi when you use big head/nozzles and don't hammer mod, so IQ is bottomed out..?

 

[doktorec]

guys have you got any info how much flow gives race 683? is it 50% more ??