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I believe you are basing your opinion on looking at a 2560 car we tuned, and a 2560 car you tuned.
You can not look at a small sample of just 2 cars, with similar mods, with cams being a difference and come to your conclusion.
If your going to make a conclusion like you are, you would need to make the cam change only on the same car.
I have done just cam changes only and 500 cams make more power through the whole power band when everything is set up right on the engine. What the cams are offering, is to allow a larger amount of air to move, this let the turbo feed itself faster and will make more overall power.
Cam timing is huge, cam timing can make or break a set up. Most of these cars can work reasonably well with the cams and timing belt installed with factory sprockets that do not allow any adjustment. Others are far enough off to cause the power band to shift, or simply make the whole power band lower.
The 2560 car we recently tuned was not put together by us, we added some parts and tuned it.
When checking the ignition timing, the CAS needed to be all the way counter clockwise for the mechanical ignition timing to match the 15 degree ECU ignition timing output.
We figured the timing belt was off, but after checking the belt, it was on correctly.
I believe this car could benefit greatly by adjusting the cam timing with sprockets that are adjustable.
I also believe this cars cam timing is off more than they normally are, I have seen 50 RWT gains from adjusting cam timing on some cars and others only see only 5.
One of the things I have seen that can cause the cam timing to be way off, would be when the heads and lower manifolds are mismatched from early to late. This causes the timing belt center idler bearing height to change and changes the cam timing.
Based on just changing cams only, and based on a large amount of cars we have tuned, with many different set ups and many different cams for each set up, I have to conclude that 500 cams make the most overall power on a Z engine than any other cam we have used so far.
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22:20:27 05/25/11
