Quote:
Originally Posted by Mr.Squeeze
The GTX2863r can't run 30 psi safely on our engines ,that's a pressure ratio of 3.0 and 49 pounds per min of air at 7500 rpms. That would be really pushing the turbos it's even a stretch for the GTX2867 r.
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indeed you are correct, on our engines you cant run that much boost. I just dug up those charts I sent you awhile back:
the 2863r is really only efficient to run up to 24psi at 7500rpm on our engine. pushing more boost would be over-spinning the turbo at higher rpm.
the 2867 is a good choice if you want to run a lot of boost, and would still be "on the map" at 30psi in higher rpm's.
looking at the plot you can see the 2867 is generally more efficient from 14psi +, so if you're going to upgrade turbos at all I would skip the 2863r, the 2867 is a great choice.
with all of that said, you can still hit 600whp with your current turbos, a bit more if you dont mind running e85 and over spinning them a bit at high rpm, so it really depends on what your goals are. I don't have the plot for the 2860rs any more but its basically the same as the 2863 except the 2860rs peaks around 2.5
PR and its .6 efficiency island (far right edge before over spinning) is where the .65 is on the 2863.