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Old 09-01-2018, 09:37 PM   #22
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region: NWIC
Location: Near Seattle, WA
05 Stage Free LGT


I just did some math on the BC 280 single-AVCS cams, and they have 6 degrees of overlap (@ .050), which is a lot by turbocharged standards (especially with a small-ish turbo like the ones you're looking at). AVCS lets you advance the intake cam, would theoretically help out low-end performance, except that it makes the overlap even larger so it would probably work against you.

In other words, the folks advising against those cams are right.

BC 272 single-AVCS cams, on the other hand, have -6 overlap (underlap?) which is more suited for a turbo car. You could give it a few degrees of intake advance before overlap starts, so I don't think you'd lose much on the low end. BC says you can run them with stock valve springs.

450whp with a TD05-20G isn't going to happen, even on E85. I'd guess 375whp. This thread suggests that G25-660 might get you there, or at least come close:

...which is pretty amazing for a turbo that comes into boost at about the same RPM range as a 20G.
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