![]() |
#1 |
![]() Join Date: Sep 2015
Location: Mt Airy, MD
Posts: 17
|
![]()
My tachometer reads approximately 48% high based upon the AC display verification.
|
![]() |
![]() |
![]() |
#2 | |
![]() Join Date: Oct 2004
Posts: 1,889
|
![]() Quote:
I discovered mine when actually trying to confirm a rear axle ratio that would have explained my tach variance but this was on a car that wasn't thought to be modified. I checked mine vs. a Tech1 scanner rather than the C68 display. Mine is repaired and correct but NOT by me. Last edited by WVZR-1; 09-05-2015 at 10:49 AM. |
|
![]() |
![]() |
![]() |
#3 |
![]() Join Date: Mar 2004
Location: Found Member
Posts: 4,346
|
![]()
Easy way ? Take the lens off then gently pull the sweep off . Then read set it and push the sweep back on.
__________________
Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
![]() |
![]() |
![]() |
#4 |
![]() Join Date: Sep 2015
Location: Mt Airy, MD
Posts: 17
|
![]()
Not sure what you mean by pulling the sweep.
|
![]() |
![]() |
![]() |
#5 |
![]() Join Date: Sep 2015
Location: Mt Airy, MD
Posts: 17
|
![]()
OK, I am guessing by "sweep" you are referring to the tach needle?
|
![]() |
![]() |
![]() |
#6 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
|
![]()
__________________
LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
![]() |
![]() |
![]() |
#7 |
![]() Join Date: Mar 2004
Location: Found Member
Posts: 4,346
|
![]()
Sweep = Tach needle.
__________________
Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
![]() |
![]() |
![]() |
#8 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
|
![]() Quote:
![]() The error is a % (of rpm) error. In short, re-positioning the needle to read accurately only works at one rpm value. the same % error will result above or below that "set" rpm.
__________________
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 Last edited by Paul Workman; 09-08-2015 at 09:53 AM. |
|
![]() |
![]() |
![]() |
#9 |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,707
|
![]() |
![]() |
![]() |
![]() |
#10 |
![]() Join Date: Sep 2015
Location: Mt Airy, MD
Posts: 17
|
![]()
Yea. Who knew these LT5's would get up to 8,000 RPMs without hitting the rev limiter.
|
![]() |
![]() |
![]() |
|
|