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I have a k24a4 block/k20a2 head frank w/ type r tranny and ecu. Right now the type s injector are in. It feels like it really bogs down until 3 grand then it really starts taken off. Kinda like you're feeling 3 VTECs. So I was thinking too rich or too lean. I pulled the plugs today and they looked really good. So now I'm thinking too lean, right? But I'm all ready running like 51/52 psi. Should I bump the pressure up (if so how much) or should I get larger injectors (if so how big, brand, etc...)?

PS- no code in ecu except p0600a (Serial link Comm. malfunction) (been told it doesn't affect preformance)
 

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If it's pulling hard through your peak torque rpm range then bigger injectors certainly aren't the problem. Timing usually tends to be the cause of low rpm sluggishness with a sudden surge coming on at the upper rpms. That's where I would be looking.
 
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