what is the ultimate aaz?

[oldskool rich]

everyone has got there methods including myself, but was wondering if there is like sum kind of tried and tested way of producing bare horse power, like a perfect formula to get the most phisically possible out of an aaz or out of any idi?

also whos car is the most powerful?

got any pics?

i endever to build a totaly mental machine that will take the english vw scene by storm and hopfully win a few petrol heads over, but i want to see what im up against and also get sum fresh inspiration b4 i commit to my idea

[rabbid79]

Ultimate AAZ?  I am currently contemplating the same question.  I purchased a new AAZ, but I dont want to install it in my car in stock form.  I'd love to stroke it to a 2.0, but there are a lot of issues with doing that.  To me, the next best thing would be to put a lightweight, forged, knife-edged 95.5mm crank in it.  Eurospec and Autotech each have nice ones.  I would also like to put lightweight forged H-beam rods in it from Kerma.  Finally, I'd like to cryo the pistons and possibly have them treated with thermal and lubrication coatings.

The reason with going lightweight on everying is to get max RPMs out of it for max HP.  I think this is one area that the IDIs have an advantage over the TDIs but don't exploit it.

This would pretty much take care of the bottom end.  For now, I would leave the rest of the engine stock, but maybe slap the head back on with a thicker copper head gasket and some ARL (PD-150) head bolts.

[vanagonturbo]

Umm IDIs and TDIs both have a 95.5mm crank. Oh and there is no way that an IDI has any sort of advantage over a TDI. Sorry to burst your bubble.

Speed costs money, how fast do you want to go?

Any modification done to an IDI (internal, obviously not IDI or TDI specific) will yield much more if done to a TDI. There is no way around it. TDIs are far superior than the IDI. Thats why MB has been using DI for so long and thats why VW has turned their back on the IDI.

[rabbid79]

Yes, I realize that the AAZ and all 1.9s have a 95.5mm crank.  But since I was just talking about putting in a 100mm crank, I thought I'd clarify.

You'll have to explain to me why having at least 25% more usable RPM vs. a TDI isn't an advantage in the HP-making department.  They each have their advantages, and "that's why VW turned their back on DI" back in the early days.  They wanted a diesel engine that drove more like a gasser (i.e. revs).

Whenever someone says "they're sorry", they're not.  Nice try, but no bursted bubble here.

[jtanguay]

tried and tested way of producing bare horse power, like a perfect formula to get the most phisically possible out of an aaz or out of any idi?

send your pump to Giles.  include around $950.  specify the power you require and what the pump will be used for.  it will be returned to you with the 'perfect formula' to get the most HP (and possibly fuel economy...) out of your IDI.

other than that its all theory... you can mess around with your pump but then it wouldn't be 'tried and tested'  :lol:

[OM617]

Thats why MB has been using DI for so long

it may have been different in Canada but the USA they used exclusively IDI engines until 1999 and their first DI was the 2005 E320 CDI. MB's first DI passenger car engine was in 1995.

VW sold their first TDI in the USA with the 1996 Jetta. VW has made TDI's since the 1989 Audi 100 and the 1993 Golf, well before MB.

[stewardc]

I bored my AAZ to second oversize, ballanced the rotating mass, TDI crank nose with all ARP studs throughout (rods, mains, head). The new head has been ported and the turbo is a Garrett T3. Giles pump is a must and the PP downpipe with a full 2.5" exhaust and Magnaflow muffler. I did install a ceramic puck clutch, but it's much too agressive for street use. In the spring, it will get a 2-stage boost controler (10psi low/24psi high)and a Saab Blackstone intercooler. Later, it will get methanol injection.

[oldskool rich]

im a little confused, should i be moving up to tdi for my machine?
alot of people slate the idi, fair enough its not that eficiant but its so much more simple, all those wires on a tdi giv me a headache

what kind of power are you hiting steward sounds like uve spent alot of time and effort, got any pics?

giv it to me strait, am i gona hit 400bhp in an idi, is it even possible?

in my mind i just cant see how tdi is better, which bits make it the superior engine?

[stewardc]

I know a lot of flack will start, but here goes. Remember that this is only my opinion.
 The TDI is more efficient, but at the cost of complexity and reliability. Those hugely dished pistons scare the crap out of me, as do the electronics. My IDI is simplicity in the extreme. I'm looking for 140-150 horsepower and somewhere around 200 ft lbs of torque on high boost. All this will be in a very driveable package that is giving me almost 70 mpg on about 7 pounds of boost and will still blow away any stock Japcar.

[jimfoo]

I don't think anyone will ever get 400bhp out of an AAZ.

[carrizog60]

you can get more than 400hp out of a IDI but its gonna be like merc 300td or similar...

1.9 is a bit small to those hp figures...

[RabbitJockey]

i think as far performance goes tdis have no real advantage aside from being able to use propane on them

[MJF]

200+hp from 1,9 Vw diesel (idi or tdi) is pretty easy. 300 is possible from TDI, IDI=? (still trying ), but needs lots of work and knowledge. And then, 400hp from Merc 6 cylider 300 IDI is easy, 500+ needs work.

[subsonic]

Just to point this in the right direction,  
Are you talking about a building an engine that will need to be driven on the street or one that is going to be high HP specific?

You can get huge power out of the AAZ if you dont mind tearing it apart after every few runs.  If you plan on actually using the engine in a daily driver, that is a different animal.

I suspect that an all out HP engine would be much easier to build than a reliable high HP daily.

Cut CR way down. Get a giles pump built for Drag strip.  Short straight pipe exhaust. PP intake.  Nitro setup.  Meth / water inj.  ARP everything.  Lighten everything you can.  Turbo is up in the air as you will want off the line and top end,  40-50 lbs of boost.  
Large tool chest to tear apart your engine on a frequent basis.

[bert]

If you want a mechanical tdi,the montego 2.0 perkins turbo diesel was a reliable lump,scrap yards are full of them  :wink:
Bert