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Old 06-12-2019, 06:03 PM   #1
pcampbell
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Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default Timing/boost vs RPM chart



Been working on tuning this thing on the street.... Still increasing timing with no knock on EJ253 with 12psi supercharger. Any thoughts on where I should focus or where I can get away with adding a bit more timing? AFRs are fat, 10.5 but that includes lots of 50/50 water meth, meaning the gas AFR is more like 12:1.


If timing increases with RPM but decrease timing with boost, should the timing line look more flat?
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Last edited by pcampbell; 06-12-2019 at 06:23 PM.
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Old 06-15-2019, 12:40 PM   #2
pcampbell
Scooby Newbie
 
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:
2005 2.5 SC OB

Default

Iím trying to pull the bottom end timing up, that is where it feels a bit sluggish. Iím not knocking at all though so the question is when do I call it good enough? Keep in mind this is a 10:1 static CR motor, not 8.x. Iíve seen people talk about 30 deg timing at redline on a 257 with 15psi. Maybe I will try to get it around 20deg across the board and tinker with it from there. Iím doing it on the road so I really donít know when I hit max torque.
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