Rack and pinion..again - ZR-1 Net Registry Forums

JFFerner · 12-03-2015

I'm about to undertake determining the causes of some steering noises as they have been previously described here. Please excuse my lack luster knowledge even after reading many postings. Steering ratios, my understandings:
Standard C4 15:5:1?
C4 with Z51 option 13:1
C4 with ZR-1 option, (ZR-1 inlcudes the Z51 option)however, per my car's manual, it has a ratio of 15.73:1
I understand the aspect of a slower ratio for high speed, but what is the steering ratio on a stock ' 90 ZR-1?

If replacement of the rack and pinion is needed, will a standard C4 rebuild be a bolt in substitute without modification?

Thanks..and so it goes..Jim

12-03-2015	#1
JFFerner Join Date: Jan 2012 Location: Dallastown, PA Posts: 189	Rack and pinion..again I'm about to undertake determining the causes of some steering noises as they have been previously described here. Please excuse my lack luster knowledge even after reading many postings. Steering ratios, my understandings: Standard C4 15:5:1? C4 with Z51 option 13:1 C4 with ZR-1 option, (ZR-1 inlcudes the Z51 option)however, per my car's manual, it has a ratio of 15.73:1 I understand the aspect of a slower ratio for high speed, but what is the steering ratio on a stock ' 90 ZR-1? If replacement of the rack and pinion is needed, will a standard C4 rebuild be a bolt in substitute without modification? Thanks..and so it goes..Jim