lisevolution said:
The only way to really get an "ideal" set of cams for exactly what you want is to talk directly to the maker who has the experience and tell him the performance you want. These were designed initially for NA applications and then adapted as per a best guess for the FI motors thus being the reason they're performing how they are. That said, lightening up the drive train to get the engine to the sweet spot faster is a way to do it or like Kooldino said, a worked head and Intake Manifold if selected properly should bring back some of the low end grunt you're losing. The idea now is to build around those cams and maximize the engine performance off of that. The spool time of the GT25R is very quick, perhaps to flow more air at the same pace you may want to contact MPNick about his turbo upgrade that puts the 28 wheel in the 25 housing allowing more air to be pushed at the same pace...
Cams is cams really, if it works on NA it'll work on turbo - mild NA cams equate to MONSTER turbo cams - thats the problem essentially, if you can call it a problem.
To get the same relative result on turbo as you do with NA, the cams would be half as agressive as they are - they are therefore essentially race cams. Its killed low end and pushed power into the midrange to top end - which is ideal for circuit but makes it a bit lathargic in traffic.
Dialing in the cams to better suite your desired powerband would be ideal, along with flowing the head, and lightening the drive train.
I remember andrew coming up to me after he picked up the order of cams, and the cam guy was flabergasted at how crazy these things are for turbo, and theres potential in them to make A CRAP LOAD of power....but more peak invariably means less low end...
I'd really consider cam gears, get the car on a dyno and dial them in to try and bring the curve back down to something approaching what you like. You can even get them dialed in for 2 settings, and just scratch a mark in the cam gears so you can easilly dial them back up for max power/circuit/dyno destruction.
MZ ZOOM: i understand your pain with money - i need to come up with some big wads of green folding stuff to do what i want to do - my engine builder is champing at the bit to get started, but cashflow is always a problem - just potter away at it slowly, get the things you can afford that you think will help, get it tuned, maybe your tuner can put a bit more ignition timing in down low to give it a bit more perk, and then save for the other bits and pieces - i see no reason why you can't make it into a beast, seems you've got most of the stuff sorted out already