Originally Posted by BC_Girl
It sounds like it would bring my times down, but I have one question. Shifting with my foot to the floor between shifts, that's better with the 60/40 diff? Not too rough on my clutch?
OK 2 questions.
With the 60/40 or with the 50/50, the idea is the same. Maximum boost as quickly as possible. I was spiking boost around 22psi during my most recent data log by doing this.
Any launch is going to be rough on the clutch. Because you have the 04 5-speed, you won't need to shift between gears as early as someone with an STi or someone with the BA transmission like me.
Again, this is the way I launch. You're welcome to use it but let me warn you it is difficult to get perfect. I know I haven't even gotten close. Shifting from 1st to 2nd, I occasionally hit the rev limiter. I've even done it from 2nd to 3rd. That time, I ran 14.0. Knew I could do better, shifted about 100 RPM sooner, ran 13.7 without hitting the rev limiter. Had a little wheel spin but not much. Probably could have shaved another tenth off by dropping the tire pressure but didn't want to overheat the clutch any more than I already had.
The best advice I can give you, go 80% on your first couple runs to get the hang of it. Ignore the ETs on those runs, just concentrate on your reaction to the light and when you need to shift. Once you get the hang of it, go full out. Between runs, PARK IT for about 10 minutes or so. This will give your clutch time to cool off some so you get the grip you need. If at any point you feel the clutch is slipping, PARK IT and let the car cool off. I've overheated my clutch, tried to drive home and all I got was slip. Thankfully, after cooling off, the clutch gripped again.
That clutch has been since replaced with a ceramic 6-puck. Haven't figured out how to slip it yet. And to all those who argue about stock transmission = stock clutch, you're wrong. If the whole car is stock, yes. I only have had one problem that the transmission shop has never seen before. The snap ring that holds the viscous coupler in shattered.