Originally Posted by
metalcrafter
On the topic of gear differentials. . Given the high grip track surfaces (black carpet) . Why do
all the top level kits come with a spool in the front as opposed to having a diff. I've also seen
mention of running a diff in front with "putty" or 500k-1-mil oil . I prefer a diff up front with 20-k
& 7-k in the back . My thinking on this , last thing I would want is the added friction induced up front by
a locked spool ( different turning radius).
Due to the caster on our cars, as the car rolls it effectively tries to lift the inside front wheel (downstops etc permitting) So it reduces the grip the inside front wheel can give.
diff's with 1-2.5million in will still have a 'diff action' but are obviously a lot tighter, going as soft as 20k up front will reduce your forward bite a lot.
As far as I recall the CRC black has a lot of side bite (hence the side wall glueing etc) but less forward bite.
Try running a spool and drastically reduce the droop and see what it does.
You'll notice that all the top team drivers high grip setups still use a spool, as a front diff can never reproduce that 'rip' out of corners.
Spools also make the cars more stable.