Does anyone happen to know how much hp and tq is gained at the wheels for each additional .1 bar of boost? I suspect the gain varies considerably depending on such factors as the size of the turbos, octane, etc. That being said, what is the approximate hp/tq gain for:

1. K24 turbos (with upgraded internals) on 100 octane?

2. Stock K16 turbos?

Thanks,

Craig

 

Over small increments, flow is linear with pressure,
and flow equals cylinder content. If the combustion
quality is equal, the power will also increase linearly.
Therefore at a given RPM, 1.0 bar should produce
20% more power than 0.8 bar. All this is subject to
lots of complications, like the reduction in power because
of the extra heat imparted to the charge by extra pressure,
etc, so actual gains will be lower usually.

 

I have heard that for every 0.1 bar increase you will see an addition of 15-25HP. So with just an ECU upgrade the maximum boost is changed from the factory 0.7 bar to 1.0 bar you get an increase of approximately 60hp... nice!

That's why changing the waste gate actuators is so appealing because you can then go from 1.0 bar to 1.3 bar on K24s... I think?

 

One of the tuners previously stated that .1 bar = 17 HP.

 

The number will depend on many factors so that number will change for each setup. It really depends on each car. The same test on a 930 will yield 22HP for every .1 bar. Also keep in mind another loose equation is for every 3 lbs of boost you raise your CR by 1 point.

 

Going from .8 bar boost to 1.0 bar is acually going from 1.8 to 2.0 bar absolute pressure. Theoretically the power increase would be 11%. That's assuming that the motor has the same volumetric efficiency at the higher boost. Theoretically it looks like you will get a maximum of +5.5% per .1 bar increase (23HP).