Speedometer Theory - Page 2

t_g_farrell · 12-10-2010, 10:30 AM

Your cable may need to be lubricated. Or theres moisture in the speedo and its
affecting the magentic pickup for the spinning cable or something.

josh18_2k · 12-10-2010, 01:04 PM

usually when your speedo is on its way out the needle bounces. that gets annoying quick.. im going 60- no wait, 30, 80? wtf

when in doubt, go the same speed as everyone else lol

tweiss3 · 12-10-2010, 04:34 PM

Lol, i use gps for my speed 80% of the time. Although, i do use cruise alot, and if tue cable dies im screwed in that mannor.

NoDOHC · 12-11-2010, 12:46 AM

I have the opposite problem, mine reads high when cold and makes this obnoxious squealing/grinding/whining sound (you almost have to hear it). After the interior warms up, it becomes quiet and semi-accurate.

ReTED, I am jealous that you have a functional speedometer on the dyno, mine apparently only reads up to about 80MPH (even though I was pulling to 165 MPH). The VSS to the ECU is accurate, but the needle on the gauge is not.

Obviously I wouldn't have any way of figuring this out on the street...

RETed · 12-11-2010, 06:42 AM

Guess I'm lucky?
But I did replace my original speedo cable soon after I got this car back in '97 or so...
I've maybe put on 30k miles on it since - it doesn't get driven that often.

It is kinda unnerving to put down a 4th gear run though as you see the speedo sweep past 100mph, and you're sitting inside going no where on the dyno runs...

-Ted

tweiss3 · 12-11-2010, 01:05 PM

Hmm, I am assuming this is the original cable, at 140k now, and it consistently reads 5 higher than I am actually going. Consistent is enough for me. I am following the key rule, If it works at all, don't touch it.

12-10-2010, 10:30 AM	#16
t_g_farrell Waffles - hmmm good Join Date: Aug 2008 Location: Huntersville, NC Posts: 757 Rep Power: 0	Your cable may need to be lubricated. Or theres moisture in the speedo and its affecting the magentic pickup for the spinning cable or something. __________________ 1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00

12-10-2010, 01:04 PM	#17
josh18_2k Rotary Fanatic Join Date: Feb 2008 Location: Gresham, OR Posts: 473 Rep Power: 18	usually when your speedo is on its way out the needle bounces. that gets annoying quick.. im going 60- no wait, 30, 80? wtf when in doubt, go the same speed as everyone else lol __________________

12-10-2010, 04:34 PM	#18
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio Posts: 319 Rep Power: 15	Lol, i use gps for my speed 80% of the time. Although, i do use cruise alot, and if tue cable dies im screwed in that mannor. __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles

12-11-2010, 12:46 AM	#19
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I have the opposite problem, mine reads high when cold and makes this obnoxious squealing/grinding/whining sound (you almost have to hear it). After the interior warms up, it becomes quiet and semi-accurate. ReTED, I am jealous that you have a functional speedometer on the dyno, mine apparently only reads up to about 80MPH (even though I was pulling to 165 MPH). The VSS to the ECU is accurate, but the needle on the gauge is not. Obviously I wouldn't have any way of figuring this out on the street... __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

12-11-2010, 01:05 PM	#21
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio Posts: 319 Rep Power: 15	Hmm, I am assuming this is the original cable, at 140k now, and it consistently reads 5 higher than I am actually going. Consistent is enough for me. I am following the key rule, If it works at all, don't touch it. __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles