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Old 05-17-2018, 01:00 PM   #8
pcampbell
Scooby Specialist
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default

Bone stock 200k mile old EJ253.

Right now I'm running 10 psi with 93+torco and a very conservative street tune. It is not even close to detonating - I am sure it has quite a bit more in it , and noticeably more power than 7 psi on 93. I will plan on switching to 93+meth when I get some better gauges installed, maybe exhaust, I am not sure.

Note this is a centrifugal supercharger not turbo, so the boost is high up, I think it is quite a bit easier on the motor than turbo with say 5 psi at like 3000 rpm. I don't hit 5 psi until 4500 rpm.

All the sandrail guys say you can do 10 psi on a stock 253 with race gas, but that is a turbo, not centrifugal supercharger. So I figure 10psi with 93+meth and a centri will be fine all day. It might even be good for 11psi @ ~6400rpm.
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Last edited by pcampbell; 05-17-2018 at 01:15 PM.
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