Quote:
Originally Posted by jedibow
Correct Serial, P=nRT is your best friend!
Remember turbos do not create pressure for free, the maximum effieciency on the turbo that Don chose is 86% which is very good aslong as you are running the turbo in this effiecency island, so AT Best you will see a drop of 14% in pressure due to the increase in air temperature from created by the compression of the turbo.
This is exactly why I state earlier that a BW EFR turbo would not be a viable option in our car UNTIL you build the bottom end.
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PV=nRT.
Pressure increases with temp, so you lose air density. You won't see a drop in pressure with compression. What you can affect is air density by controlling the volume/temperature.
the amount of boost you run is dependent on the size of turbo as well.
My 6262 is happy running 15-16psi on 91 octane, but a tiny T25 would melt things. It isn't as efficient. I vote for a slightly larger turbo at the expense of lag, but better high rpm efficiency. I think the GT3071r is good. the GT3076r has too large of size differential in wheels imho. But the 6 bladed wheel sounds sick.
I think the GTX3071r would be a nice option but they are really expensive for what they are.
The disco potato is probably the best overall option for most people out there. It is small, but properly sized, and very efficient. I think 7psi on this turbo will produce a nice surge of torque right at 3000rpm. And also with tune should produce over 250whp. 10psi should put it around 280-300whp, but we'll know more when we see how the head flows.
There is a lot to consider on turbo efficiencies. A lot of variables at play here.