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Were you applying the brake when you tested base boost? Yes that's right, have your foot on the brake (not too hard mind you, don't want to warp/overheat them!), then give it full throttle. This will simulate a higher load, as you would experience going up a very steep hill or with a heavily loaded car, or at very high speed. I got a 0.5 psi or so difference by just going full throttle without braking, vs. with.
If you're already getting peaks to 16-17 psi, that's better than my car was doing with just over 4 psi base boost. I would barely touch 16 on the very best day, and that's with water injection too. However, it would hold 15-16 rock solid - AND, this is with only a 3.0 bar FPR and stock injectors. Raising base boost really improved the max boost, but has not improved the solidity of the higher boost. It still will only reliably hold maybe 15 psi, and even lower as I get over say, 4500 rpm. Hence, I seriously am thinking of turning base boost down to 5 psi or so. I miss the feeling of having one SOLID boost level no matter what. I'm going to see if some APC settings can bring about this result first, however. I am under the impression, perhaps mistaken, that it's better to run a higher base boost if you are running higher than stock max boost, even if you adjust the APC so that the max is only 15 psi or so. Even with only 15 psi max, I still love the way my car feels around town. It feels GREAT off the line (base timing is at 20 BTDC) and will scoot right along even if you get off the throttle by 10 psi. Of course, at freeway speeds and two lane highways, it's great to have the 15 psi on tap for passing...
Anyhoo... :)
Aaron Gilbert
posted by 207.202.17...
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