I have a 02, sc430. Modded with blitz supercharged and straight exhaust all the way..( accept the 2 catalytic converter before the o2 sensor.) but i have slight delay or lag during the first gear. From (rpm) 1k to 4k its delay or lag.(not revving smooth). But when its reach 4k and above, the power just kicks in suddenly. I hope you guys understand what im saying. Sorry for the bad english.
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Do you have a dyno run with with AF? This is a tuning issue where any of a hundred factors could be the cause.
Also, make sure you disable the traction control too. The traction control is super super sensitive and will cut the engine without the traction light necessarily going on. I'm guessing though that you had to disable it as even the stock power is enough to lose traction if you slam the throttle wide open at a stop with cold tires. It will kick in even before losing traction and the light won't go on but you'll lose power.
Nope i didnt dyno it yet...but i think it doesnt require a dyno . I did switch off the traction control but its still the same. For me i think is the throttle body thats lag or delay. So may be it need a throttle controller?to reduce delay response. But my first gear wasnt revving that smoothly.