Heh all I meant was for this initial tune I'm gonna gun for about 25-26psi, see what it does with some timing and then go from there. If it responds super awesome then yes I'll be tempted to bump it up to 28 or so and push it a bit to see what it does, but at this point I just want a good solid base tune on there for daily abuse and then depending on what I do in the spring I'll turn up the wick a bit.
Quote:
Originally Posted by mlomker
Why wouldn't a built 4G? You guys rarely build your bottom end so I suppose that's why people keep the revs down.
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The head dynamics on the 4G63 get worse and worse the older ones you get. It's way more common, to get good torque and then peak power at 6500-7000rpm or so, then fall off. Unless of course you have a big turbo with a big hotside.