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 speedo and tach accuracy
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186 posts [100%]
Topeka KS
4-20-2010
  speedo and tach accuracy« » Reply  Edit


I'm curious how accurate the tach and speedo is on other Rs.

My tach has never been 100% accurate with what the computer reads. If I remember correctly, it may be off as much as 400-500 rpm at 9k.

As for the speedo, it hasn't ever been the most accurate either. When I actually used to drive the car, it was accurate at lower speeds but was off a bit when cruising the interstate. I think the problem is getting worse and I'd like to correct it. I noticed last month that I was actually doing 45 when the speedo said 55. What am I looking at to correct this? I'm on stock wheels and 195/55/15s.


2000 Camry - DD POS
2016 Pilot - Tow vehicle and weekend car
1998 R - 0650: 8/05 Track Car
2000 R - 1102: 1/05 - 8/05


RTW DC2R
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2207 posts [100%]
NYC
10-20-2002
 « Re: speedo and tach accuracy (Move Over)« » Reply  Edit


Pretty sure we all have this problem.

My speedo is definitely way off compared to gps readings and gets worse at higher speeds. My tach is much more accurate than the speedo but not exact.

4K rpm with stock trans, wheels and 205/50 azenis puts me right around 70mph gps indicated though the speedo reads closer to 74mph. 75mph reads closer to 80mph on the speedo.

I think its a combination of the speed sensor gear being off and/or wearing slightly over time, and wheel/tire sizes.


98-0034 - Track Daze y0
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Outrun




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830 posts [100%]
1-17-2008
 « Re: speedo and tach accuracy (RTW DC2R)« » Reply  Edit


From Hondas I've driven (1994 Civic EX, 1994 Civic Si, 1995 Civic Si,1999 CR-V, 1996 Integra GS-R, 1997 ITR) the speedo seems to be about 5mph optimistic so that an indicated 80mph is a GPS 75mph.

Not sure exactly how the tach works. My 1994 Civic used to read about 3000rpm at 70mph and then occasionally started reading 3000rpm at 80mph and the fuel cutoff went from about 7100-7200rpm to just past the 6500rpm mark. It now regularly stays at 3000rpm at 80mph though the speedometer needle has started going all over the place (straight down, 110mph, 0mph, or jumping back and forth).


"Who killed Vincent Chin? Was it them? Was it us, not giving enough of a f*** to stand up?"


Mt3c
Only my opinion

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14 posts [100%]
Orange County CA
6-29-2016
 « Re: speedo and tach accuracy (Move Over)« » Reply  Edit


Same issue here. Comparing my OBDII readings to phone gps, u get a difference of about 8% higher reading on the speedometer/OBDII compared to phone gps. From memory, tachometer wasn't so great either when compared to OBDII reader.

Now imagine if the inaccuracies translates into odometer reading too? 100,000 miles should actually read 92,000 miles.


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186 posts [100%]
Topeka KS
4-20-2010
 « Re: speedo and tach accuracy (Mt3c)« » Reply  Edit


Quote, originally posted by Mt3c »

Now imagine if the inaccuracies translates into odometer reading too? 100,000 miles should actually read 92,000 miles.

That's what I've been wondering for the past few years. I'd love to be able to correct whatever is causing the error.

New tires (stock size) and a new speedo had no effect. I believe it reads higher with the K20 tranny than it did with the ITR tranny. It seems to be off by 10 mph around 45 mph, off by 5 mph at maybe 60 mph, and then starts getting off more the faster speed I go. At 80 mph it reads close to 95.


2000 Camry - DD POS
2016 Pilot - Tow vehicle and weekend car
1998 R - 0650: 8/05 Track Car
2000 R - 1102: 1/05 - 8/05

RTW DC2R
Bump drafting j00



Online

2207 posts [100%]
NYC
10-20-2002
 « Re: speedo and tach accuracy (Move Over)« » Reply  Edit


Thats way off comapred to mine.

Ill hook up my OBDLink next time Im in the car and see what it looks like.


98-0034 - Track Daze y0
00-XXXX - The OG NOPI Fish Tank Type R - SOLD

My For Sale thread ITR and Misc Parts For Sale


coolhandluke
Break on...



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13070 posts [100%]
HI
12-12-2005
 « Re: speedo and tach accuracy (Mt3c)« » Reply  Edit


Quote, originally posted by Mt3c »

Now imagine if the inaccuracies translates into odometer reading too? 100,000 miles should actually read 92,000 miles.

They would.


98-1040
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01-0187 - Sold
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SwiftITR
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134 posts [100%]
Des Moines Iowa
11-20-2015
 « « » Reply  Edit


Because I am boosted and using fairly conservative Rocket turbo cams, I know my tune is set to activate VTEC right at 5k rpm. However, if I watch my tach, it reads 5,300rpm before it activates. I'm pretty sure the ecu is correct and activating it right at true 5,000rpm...

AssPenny




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1364 posts [100%]
Hooston TX
11-11-2002
 « Re: (SwiftITR)« » Reply  Edit


Anybody do a speedo correction? I was looking at a kit that is popular with bikers but then I remembered I don't really care that much

http://www.healtech-electronics.com/products/sh/

This ones been around for a while as well: http://yellr.com/yb_home.htm

Craig - Who uses his AIMS when driving home from the track


01 #1075
03 ///M3
http://www.we-todd-did-racing.com
 

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