Power steering?

[scottj]

Originally Posted by Cobranut

How does a steering rack even get full lock with less than 1/2 turn of the wheel? The pinion would have to be enormous, or the steering arms extremely short to achieve that.

I had 3/4 turn lock to lock with an 3.9"/turn Appleton rack and 5" steering arms. I've also run a 4.5" Sweet rack that was noticeably quicker. Pinion sizes were approximately 1.2" dia and 1.4" dia. These were on dirt late models. A standard road race rack is 2.0"/turn while an autocross rack might be 3.14"/turn. Easy-peazy...

[Cobranut]

Originally Posted by scottj

I had 3/4 turn lock to lock with an 3.9"/turn Appleton rack and 5" steering arms. I've also run a 4.5" Sweet rack that was noticeably quicker. Pinion sizes were approximately 1.2" dia and 1.4" dia. These were on dirt late models. A standard road race rack is 2.0"/turn while an autocross rack might be 3.14"/turn. Easy-peazy...

Thanks. I guess I wasn't really thinking about the circumference of the pinion being the rack movement in one turn.

My Cobra has an MG rack that gives about 2 turns lock to lock. Much quicker and steering effort would get pretty high when parking.

My race car's rack ratio and steering arms are set by the rules. It has about 1.4 turns LL. Of course, it only weighs about 1,300 lbs with driver.