BUL Engine details

[warp_speed]

I've got a 2.0TFSI BUL engine and noticed that there are two intercoolers on the car, I've got one in each of the openings next to the front fog lights, is that correct I was under the impression that there is only one, is this because the engine is the 217 hp one?

[solaris10]

No, all 2.0TFSi A4's have two side mounted intercoolers.

[warp_speed]

Does anyone have any engine diagrams for this engine, I'm a geek when it comes to mechanical stuff and seeing how everything plugs together would be fantastic :-)

[dan.taylor.1]

Dont all turbocharged A4's have two? in fact i cant recall seeing a turbo VAG without two?!

Dan

[kodkod.84]

Not sure about the lower powered diesels- my 1.9TDI B7 had a blanking plate over the air intake on one side.

[warp_speed]

I'm wondering how a dual intercooler system would work, as far as I know you need to cool the air coming into the cylinders because pressurised air increases in temperature. Think I'll check wikipedia

[dan.taylor.1]

the charge passes into one IC, out of it into a pipe that runs under the Rad/AC Rad and into the second IC then into the inlet. IIRC it goes to the drivers side first then the passenger side. Or at least it does on my 2.5 Tdi A4.

Dan

[Lateknight]

Exactly as dan. stated.
Due to lack of space in front of the engine, two side intercoolers where fitted instead of a larger central one.
It works very well for standard and mildly tweaked engines.
My intake temps according to vagcom are not much more than ambient. Last time I ran a data log check ambient was 18c. Max. intake temp. was 38c. The max occurred after coming to a halt after a run.
The TT Mk1 (225ps &245ps) also used a series linked twin intercooler setup.

[warp_speed]

Brilliant thanks for the info. Just a general Turbo question, without the intercooler how hot would the air get when compressed, I mean it must get hot if it starts to explode before reaching the cylinders?

[dan.taylor.1]

It doesnt explode before it reaches the cylinders mate, it would get hot though, and therefore less dense, hence the IC which cools the air, which increases the density but i think decreases the pressure, mind you its still at a higher pressure than a NA car. I honestly dont know how hot it would get but itll be high as its been compressed right next to the turbine housing for the exhaust side of the turbo which gets red hot, as in glowing on some cars, my mates scoob once melted the little plate with the turbo details on it it got that hot.

Dan

[Lateknight]

Its not the compressing of the air that creates the heat, its the heat transmitted to the air by the turbocharger itself that requires the air to be cooled.
A general rule of thumb is that for every 10 degrees farenheit (6c) cooler you can get the intake charge temperature, a 1% increase in hp can be gained. As said before cooler air is more dense and therefore contains more oxygen, which when combined with the right quantity of fuel (vapour) makes POWER.

[dan.taylor.1]

Lateknight, just read my post, yeah did read like i meant the heat is caused by compression of the air (which in fairness is partly true, ever held your finger over the end of a bycicle pump and pumped a few times, they get warm!) and is in fact caused by the conduction/radiation from the exhaust turbine side. haha ill read my post beofre i post from now on to make sure i dont seem dense!

Dan