Norwegian OM606 build

Turbo

Holset

489

10-08-2013, 01:25 AM #255

Yes, to fit intercooler is a real challenge specially if one is to use an aftercooler as well with is quite good in point to gain some efficiency or less need of drive pressure depending how you want to put it.

The efr 7163 has a mass ratio about 6 if we consider 0,08kg/s to 0,45kg/s from pr2 to pr 3, as what I have seen that wide is quite good but I have not seen the HX300W so I can not say anything about that one. The back side to efr 7163 is it poor capability to handle surge but it has titanium turbine wheel and diagonal turbine construction so back pressure is less going to be affected by the turbos rpm and ball bering will aslo help spool time. for om606.962 13psi at 1600rpm and goes by it self up to 4000rpm at 40psi so by suitable LP turbo it has no problem to come along up to 7000-8000rpm with a flow of 100lbs/min if it is desired without need to be shut down before.

If you are going to run the turbo quite by them self I can understand you need for high pressure ratio for HP unit but a high pressure compressor design is going to have trade of in other areas. if we consider constant polytropical efficiency for the compressor design is-entropic efficiency is always going to drop from best efficiency point with increasing presser ratio. The really hard part is that no manufacturer, that I know of, show openly there turbine map, and holset is even hard to find the compressor maps as well. If you have enough information on the unit in hand you can put it in borg warners matchbot to play to see how it comes out to make an early prediction of performance for the engine, of course the program have some limitation but it is quite fun to see the difference of different setups

It is going to be very interesting to follow you build, keep up the good work

(10-07-2013, 05:30 AM)EDH_Performance
(10-06-2013, 05:20 PM)Turbo It would be very interesting to compare the HE300WG map to efr 7163
why do you want to inject water /methanol between the LP and HP stage
No after and intercooler?
Nice pump )

Sorry, the compmap isn`t for the public
But i can tell you that it is a bit wider, starting from the same lbs/min and the holset can handle one bar extra... The pr peak is at the same place, but the holset is at pr:5 where the efr is only 4. The holset holds that peak quit long
if this is the compmap:
http://www.turbodriven.com/performancetu.../71x80.jpg

I don`t know if i have room for an intercooler between the stages, but time will tell