Tac calibration issue??? - ZR-1 Net Registry Forums

Paul Workman · 02-08-2008

When I mentioned to Pete and again to Mark Haibeck (yesterday) that at 7000 rpm I'm only doing about 102mph, the question of tac accuracy came up (Pete). Or, do I have a 4.10 gear? (Marc). I verified my rear gear is a 3.45, and I hooked up my scanner and ran the tac up to a steady 3000 rpm, and the scanner rpm says 2565. Hmmmm.... Pete tells me he's at 122 mph at 7000 rpm with the stock 3.45 rear gear, and if I do the math, 122mph*2565/3000=102mph.

Q: Obviously my tack reads high at steady rpm. Is that to offset tac lag in rpm runup, or is there some calibration issue I might want to address?

What say da Z gurus??

TIA,

P.

02-08-2008	#1
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Tac calibration issue??? When I mentioned to Pete and again to Mark Haibeck (yesterday) that at 7000 rpm I'm only doing about 102mph, the question of tac accuracy came up (Pete). Or, do I have a 4.10 gear? (Marc). I verified my rear gear is a 3.45, and I hooked up my scanner and ran the tac up to a steady 3000 rpm, and the scanner rpm says 2565. Hmmmm.... Pete tells me he's at 122 mph at 7000 rpm with the stock 3.45 rear gear, and if I do the math, 122mph*2565/3000=102mph. Q: Obviously my tack reads high at steady rpm. Is that to offset tac lag in rpm runup, or is there some calibration issue I might want to address? What say da Z gurus?? TIA, P.