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#11 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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I
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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#12 | |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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#13 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,118
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I have some 5:13's!
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#14 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,359
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Big John, is that what they run in the Callaway? 5.13's? Wow.
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#15 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Hans,
If u have GPS, u can use that to confirm.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#16 |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,065
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Good point, Paul. As I recall from my (very) old days summer job as a track mechanic at Ford's Dearborn test track, it was not a problem but I don't recall truly if we dealt with posi axles back then. I do know that with open rears we had to have an assistant hold the other wheel while we counted the axles. So if you are right that both need to rotate, then jack up both wheels and let them rotate together. That should work I would think. --Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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#17 |
![]() Join Date: Oct 2004
Posts: 1,889
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#18 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,118
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#19 | |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Bob, you were right, tach is off considerably. The speedo is correct. At 60mph the correct rpm is about 2800. Based on the formula that is right for a 3.54 diff ratio. Also noticed that's the tach is really off at high rpm. When I shift at 7+k on the tach I'm barely at 6k in reality. Anybody have any thoughts on how to get the tach fixed? H ![]()
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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#20 | |
![]() Join Date: Oct 2004
Posts: 1,889
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There are a couple possible ways to correct the tach. In the past few years there's very likely a much improved procedure than what was used for years before. Mine was actually done by an GM/ACD cluster facility that I had a relationship with at the time. My entire cluster and display was confirmed. The tach correction has been a DIY for many but much depends upon the persons talent. I don't know how expensive a "for hire" today might be but if the "for hire" included a check/correction of the entire cluster that could be a very good way to proceed. I sent a circuit board to PW many years ago for him to sort out a project he had at the time. |
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