Quote:
Originally Posted by gmsii
i think it would be good to qualify some of the above statements to more accurately reflect the differences between Rotrex vs Turbo
Turbo advantages:
- Makes more power at the given boost level (more efficient)
** actually this is not true...because the rotrex's high rpm capabilities, it can run compressors with the same efficiencies as turbos. however, at the same boost levels and same piping and intercooler configurations the rotrex should make more power because the charge air temps should be lower. the Rotrex has a maximum operating oil temp of 180F, so compared to the exhaust side of the turbocharger there should be less heat bleeding over to the compressor side. with the rotrex there will be a few hp used to turn the blower, so the question is if the power lost in turning the blower greater or less than the power gained from having cooler charge temps.
-More low and midrange torque
** this depends on the size of the compressor housing. the power on a smaller turbocharger may come much more dramatically at lower rpms, but may also run out of air on the top. but generally speaking the power of a supercharger will come in much more linearly than a supercharger.
Turbo disadvantages:
- A bit more complex project since it generates more heat which requires more heat insulation to prevent heat soak issues (wraps, turbo blankets, hi-temp coating ..etc)
** yeah...turbos run hot hot hot...protecting and managing against the additional heat is paramount
- Possible lag and unpredictable power delivery (may not be the case for smaller turbo setups)
-Transient response is somewhat delayed even with smaller turbos
** yes..the sc responds instantly
Rotrex disadvantages:
- Lacking the advantages of the turbo ( see above)
- Possible belt issues (I think it's addressed on the newer kits though)
** this is more a possible kit developer related issue and not inherent to the Rotrex itself. on the KW kit, the sc belt drive is independent from the engine accesory belt, so even in the case of breakage, you can still drive the vehicle.
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Thanks for the explanations. I guess I am leaning towards to KW kit but can you please tell me whether or not I can use the SUBARU oem oil cooler with a smaller nut (the one behind the idler pulley)? The bracket size is my only concern with your kit, other than that it looks very good. I know you guys will soon offer an oil cooler kit as well but I would like to use the OEM cooler for OEMish look, simplicity and cost.