Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Race Car Tech
Reload this Page >

My FB Tach Reads High -- How Do I Fix It?

Race Car Tech Discuss anything related to road racing and auto X.

My FB Tach Reads High -- How Do I Fix It?

Old 10-04-08, 10:23 PM
  #1  
Red Car, Blue Notes
Thread Starter
iTrader: (1)
 
elwood's Avatar
 
Join Date: Mar 2003
Location: Lake Orion, MI
Posts: 1,461
Likes: 0
Received 2 Likes on 2 Posts
My FB Tach Reads High -- How Do I Fix It?

I know it's reading low because my standalone ECU and the tach on the dyno both say 7300 RPM, when my tach says 8000 RPM. Is there a way to calibrate it?
elwood is offline  
Old 10-05-08, 09:30 PM
  #2  
Death to Infinite Scroll
 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 11,702
Received 43 Likes on 40 Posts
grannysspeedshop.com has a writeup on recalibrating for V6s and V8s but you can use that for calibrating for rotary as well.

IMO don't bother, just get a quality tach like a Sport Comp. The stock tach actually is accurate in 1st gear, unless your car is really quick in which case it actually lags behind the engine, despite being 10% too high under steady state conditions.
peejay is online now  
Old 10-13-08, 09:58 PM
  #3  
Red Car, Blue Notes
Thread Starter
iTrader: (1)
 
elwood's Avatar
 
Join Date: Mar 2003
Location: Lake Orion, MI
Posts: 1,461
Likes: 0
Received 2 Likes on 2 Posts
Thanks, man -- an excellent write-up! Just what I was looking for.
elwood is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Th0m4s
Build Threads
25
02-26-19 02:04 AM
stickmantijuana
Microtech
30
04-23-16 06:37 PM
Thor 18
Interior / Exterior / Audio
4
09-13-15 08:39 PM
Coolant_Leak
3rd Generation Specific (1993-2002)
2
08-30-15 11:18 AM
tsmith94FD
3rd Generation Specific (1993-2002)
4
08-16-15 05:41 PM


Thread Tools
Search this Thread
Quick Reply: My FB Tach Reads High -- How Do I Fix It?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: