Turbo Project

[Jukka Majanen]

Hi

Alex and Huw wrote:

> Is it though? at 1 bar you *know* air is entering the cylinders at 2 bar
> absolute, right, so that's x many moles of O2.  A normally sucking car
> does not draw air in at 1 bar absolute, there is some vacuum and that is
> the key.  maybe its only 1/2 bar, so the turbowhining engine needs FOUR
> times the fuel.  for example, hypothetically...

Oh, I wish that was true today, when I tested my MC with 1 bar.
2.2 liter 100kW when N/A should then give 400kW, but it didn`t :))

OK normal volymetric effiency is some 85%, that means two revs
give Audis 5T; 2.22 x 0.85 = 1.9 liter.

When charging at 1 bar, P/R is 2, so it is now flow of 3.8 liters, but
compressor and I/C effiency has to be noted too, then maybe 3.
liter. Volymetric effiency isn´t exact same but close. 3.0 / 1.9 x 100
is some 160 kW x 1.36 = 215 HP. Maybe that´s the power I had
today, anyway -it was nice.

>> plumbing and the turbo.  Maybe the ISV should feed from before the turbo,
>> mine feeds from right before the throttle body as a stock GTi would.

> maybe someone, anyone, with a stock turbo setup can tell you where the
> ISV goes "between"?

In older 10v:s it´s plumbed between IC outpass and intake rear part,
and in the newer 10v:s ( like mine ´90 MC ) has it internally in the
manifold. But allways after the turbo, so there are no great pressure 
differences in both sides of the ISV.

my 2 pennies
j-pm