OK, so I hit the dyno again back in July, but then headed out on vacation with the family, so I've been slow posting the update. Here we go:
The new cams only added 8 WHP, peaking at 242 wheen hp (285 at the crank) and peak torque was the same at 230 Wheel lb ft (270 crank). Here's the graph.
For reference, here is the previous dyno run with same exhaust and configurations, but with stock 964 cams.
Something that seems weird to me is that peak torque is now occurring at a lower RPM than with the 964 cams (4,300 rpm vs 5,000 rpm). That should not be the case. The more aggressive cam should be peaking later in the rpm range. I'd love to get people's thoughts on why this would be. My current theory is that the GT2-107 cam is a bigger bump (more duration and a lot more lift at .470" vs .430") on the exhaust side than on the intake side compared to the 964 grind. While I have 1.75" B&B headers, I was back to the Dansk sport 2 in 1 out muffler for this dyno test and I'm wondering if it is really starting to restrict on the exhaust side? The test will be to go back to the freer flowing Monty muffler and see what it does then.
I would be lying if I said I wasn't a bit disappointed with the gross numbers, but I am absolutely loving the character of the motor now and how it drives. The motor feels like it is smoother, smaller displacement (in a good way), and higher strung that with the stock 964 cams. Regardless of the numbers, the tune is pretty well dialed in and running the best it ever has and I am very happy with the cam upgrade.