850 tdi POWER!!!!!!

[martin_r_smith]

Originally Posted by bongodave

Scania Turbo it! http://www.youtube.com/watch?v=24afjVqm2Uw

Haha that made me chuckle. He is a right loon that dude, his new super and turbo charged MB is a beast!

[martin_r_smith]

Brickman

I have used a 3bar before (just any old audi one will do it) and it alone will increase boost pressure by around .3 bar across the rev range. I use a MBC now as the wastegate on the kkk has a habit of opening prematurely, the MBC aids a speedy spool up and holds a nice 18psi right through. The decat enabled me to hold 18psi in the higher rev range as it reduced exhaust manifold pressure. It doesn't drone at motorway speed but it is louder at 50mph. Sounds lovely though.

A 16t does work well and is almost a bolt on. But you can run all the boost in the world on a diesel, unless you have sufficient fuel it will do absolutely nothing to the power output. Unlike a petrol the car itself will not add additional fuel when more boost is used. The standard nozzles are good I reckon for 200bhp, but the little kkk cannot flow enough air to get an efficient burn, resulting in excessive smoke.

The plug in box is the key to extra fuelling on my setup, however larger nozzles .240-.275 will work about the same. The box I linked earlier is the best one I've used and I think it is reasonably priced too. The box on its own gave me 170bhp 270ft/lb and the difference over stock is amazing. It is a little smokey at this power so I turned the box down a bit (160 ish).

Injectors- mine are 190k old are stock .216, I dynoed the car as standard and was within 1% of factory power so I guess there ok. Just run millers or 2 stroke in every tank and they will be fine.

The flywheel will be fine, it will shake like mad but be sympathetic, ie back off a touch when you know its going to happen (normally 2100-2600rpm in 4th at WOT).don't worry about until it breaks I say.

Fuel economy wise, if you worry about it then leave your engine alone. I do still get the same or even a little more (computer tells me 58.6 mpg lol) if I drive it like my grandad but you can't help but give it a little squeeze so in reality the economy goes down. I average 40mpg.

Again with your turbo, it may well be on its way but worry about that when it happens. The kkk k14 might well be the strongest thing on earth in my opinion, it can take 2bar all day long and still be happy. Unfortunately it is a hot air blower at this and highly inefficient.

[brickman]

Amazing information, thanks much!


MAP sensor I don't think I've been able to idenfity, my setup (MSA 15.7) doesn't look like it appears on Vadis/VIDA. I figured it should sit somewhere between the compressor and the intercooler or after it, but so far not seeing it!


Thats what the typical VW item looks like.

Injector wise sounds like its worth me getting my standard injectors done and benched as with this car at least for this year I have no plans on going big with it, needs to be able to drive and function without having threat of impending DMF failure.

Another odd question for you. 5th gear swap, I know the VW/T4 people often do it and drop a fair few rev's in top gear. I currently get slightly over 1900rpm for an indicated 60mph (15" stock wheels), motorway cruising speeds I find the rev's fairly high for the size of engine. Anything over 70 seriously drops the economy, I reckon its right on peak torque around 70-75mph, great for towing caravans at speed but not for much else. Question is, are there different ratio's of boxes, a 5th gear swap option, or just stick bigger wheels on it and then adjust the speedo with Vadis/VIDA?

[martin_r_smith]

On the end of the inlet manifold (top left of engine bay) is a pipe leading to the MAP. Remember though if your not adding fuel and just increasing boost you will gain nothing. Exhaust gas temps will go sky high and you will melt something.

Getting the injectors done make a notable difference and economy will improve. You could get the company to put lager nozzles in at the same time though. .230 should do the job then with a 3 bar MAP or MBC you should see 160 smoke free horses. Even at that the flywheel will shudder like a bugger!

[martin_r_smith]

Regarding gear ratios, its an M56 gearbox so im sure there are options. Personally not looked into it as I dont really care about economy.

Bigger wheels would help you yes, not sure aboute the speedo part, but to be honest it probably wont be that far out as what you gain in wheel you lose in tyre profile.

Also got to remember this is quite a revvy engine for a diesel, they care not for being driven off boost (below 2000rpm).

[scvolvo]

I fitted a m66 to an 850 t5, maybe you could fit the m66 diesel box? I think they are geared much higher.

[scvolvo]

If it's a m56 box could you not use the solid flywheel and clutch from an 850r? Although I maybe being stupid.

[martin_r_smith]

Originally Posted by scvolvo

If it's a m56 box could you not use the solid flywheel and clutch from an 850r? Although I maybe being stupid.

Gearbox is the same but the output shaft from the audi lump is different.

[scvolvo]

Oh I see that's a shame, would have been nice and simple

[martin_r_smith]

Originally Posted by scvolvo

Oh I see that's a shame, would have been nice and simple

It certainly would! But I have not heard good things about a SMF with these diesel engines anyway. Yes it shudders with a DMF with high torque load but apparently worse can happen with the SMF. I think I may try using a sprung clutch with the original flywheel in the hope it cusions the shudder somewhat more.