SOS stage 2 running 3.2 pulley
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Well first off which blower is this 1220 or 1200? Because they both have a different rpm cap. A 1200 with a 3.2" pulley max rpm is 8350rpm. I saw average 17psi there. Now, couple that with 91 oct and id say you are pushing the comfort level of most tuners. The stock fuel system with a 340 and 1000cc injectors will handle this no problem, but will the tune on the engine is the question. If you rev beyond 8350rpm or bump down even smaller to a 3" pulley, your not only risking the blower bearings, but ramping up additional IAT, and that's going to further up your chance of detonation. 1 point of OCT does make a noticeable difference when your tuning window is this small between not enough timing and too much to keep the motor in a healthy running state in a fluid environment. The lower the oct and the more boost you make, the smaller the tuning window gets for you to work within. A SC does help keep that window a bit broader vs a turbo however since all the boost is concentrated at the end of the rpm band. But it still needs to be right.
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Well first off which blower is this 1220 or 1200? Because they both have a different rpm cap. A 1200 with a 3.2" pulley max rpm is 8350rpm. I saw average 17psi there. Now, couple that with 91 oct and id say you are pushing the comfort level of most tuners. The stock fuel system with a 340 and 1000cc injectors will handle this no problem, but will the tune on the engine is the question. If you rev beyond 8350rpm or bump down even smaller to a 3" pulley, your not only risking the blower bearings, but ramping up additional IAT, and that's going to further up your chance of detonation. 1 point of OCT does make a noticeable difference when your tuning window is this small between not enough timing and too much to keep the motor in a healthy running state in a fluid environment. The lower the oct and the more boost you make, the smaller the tuning window gets for you to work within. A SC does help keep that window a bit broader vs a turbo however since all the boost is concentrated at the end of the rpm band. But it still needs to be right.
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Originally Posted by s2000Junky' timestamp='1439146496' post='23709139
Well first off which blower is this 1220 or 1200? Because they both have a different rpm cap. A 1200 with a 3.2" pulley max rpm is 8350rpm. I saw average 17psi there. Now, couple that with 91 oct and id say you are pushing the comfort level of most tuners. The stock fuel system with a 340 and 1000cc injectors will handle this no problem, but will the tune on the engine is the question. If you rev beyond 8350rpm or bump down even smaller to a 3" pulley, your not only risking the blower bearings, but ramping up additional IAT, and that's going to further up your chance of detonation. 1 point of OCT does make a noticeable difference when your tuning window is this small between not enough timing and too much to keep the motor in a healthy running state in a fluid environment. The lower the oct and the more boost you make, the smaller the tuning window gets for you to work within. A SC does help keep that window a bit broader vs a turbo however since all the boost is concentrated at the end of the rpm band. But it still needs to be right.
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