Join Date: May 2006
Location: Gaithersburg, MD
Car Year: 2009
Car Model: Outback XT-B
When you add more power it can increase 60' times. Less low-RPM power, slower spool, less power off the line can all cause some bogging off the line.
Lots of wheel spin can be controlled with better modulation of the clutch, or lower RPM launching. You've gotta play with it a little.
Using the 20kg won't really add stress to the tranny. It'll remove stress from the pinion shaft because the stock center diff will stop unloading.
If you are JUST drag racing, I'd weld up the center diff. It would kind of suck for daily driving, but it would maximize traction. All 4 go up, or none at all.
09 SWP Outback 2.5XT 5MT 263whp, 337 lb-ft