Please help me with this 0-60 time (best 6.22)

Gray Goose

Guys, I just cannot get my Z 0 to 60 any faster than 6.22 (average is about 6.35).

I am spinning the tires a good bit with the high rpm launches but....I think I should still see better than 6.22 as consistent as the take offs are.

I have tried dumping the clutch at low RPM and high RPM, I've tried feathering the clutch at low and high RPM.

The best times are coming from launching at about 5000-6000 RPM and not dumping the clutch....just letting off of it smoothly. But, I can smell that clutch burning pretty good doing that.

I want to start my turbo build this weekend, but I would really like to figure this out first. Any ideas? Is this normal?


Z info
2012 Nismo
61,000 miles
has an aftermarket flywheel that is pretty loud (don't know the brand or type)
Fresh fluids (all including CSC flush, diff, trans,engine)
Stillen short throw
Mtec springs
Z1 solid diff bushings
Z1 solid engine mounts
Z1 Urethane Trans mount
K&N short intakes and filters
GReady cat back exhaust
Tein FLex Z coil overs

All road tests, 85 degrees outside with about 80% Humidity at sea level

Running 285-40-19 F8000 Otshu