Thanks - I've seen that and read it a hundred times before I installed the Diamante cams. They're saying the same thing that Charlie is on the valve timing - and it's what I believed would be the rationale before I made the swap. I'm just not seeing the results on the dyno or my butt gauge. From what they're saying, you'd think I should retard the cams instead of advancing them. It appears that I'm looking at the other side (closing) of the lobe from Charlie (and GrapeApe) and it may be necessary to give more consideration to the entire cam pattern.

According to the dyno operator I used, he has seen many instances where cams that were retarded as much as 8* worked better in a blower application. I suppose it might have to do with how much power the engine can make on its own and where you want the power band to be. Certainly, some of the engine's power is lost to turn the blower... if the engine doesn't quickly make power on its own, it can't get going with the blower.... but that's a completely different issue that I'm not complaining about. It doesn't sap engine power if the blower isn't on line because of the bypass valve, so I think there should be more power built lower and before the blower ever comes on line for ordinary street driving. That means an earlier closing intake and less valve overlap. That may be one reason the cam doctors use a different profile for blower engines.

I've spent a bunch of time building a Mitsubishi cam spec table - perhaps it should be in a separate thread for future reference, but I find it very interesting that for the 3000GT TT, Mitsubishi did some of the things mentioned by GrapeApe (late valve opening times), but they reduced valve overlap by shortening the duration time on both intake and exhaust to different extents.

It appears to me that any of the N/A cams will be a compromise and the best solution might be custom cam patterns - or changing to the 24v DOHC heads where I can have separate control over the intake and exhaust cams. But changing the heads will also require a change to another ignition system - not impossible w/MS, but probably not a lot of fun.

If anyone can tell me how to convert an Excel file to .jpg or .jpeg, I'll post the chart.

Frank