Tach pulses per revolution - LS1TECH - Camaro and Firebird Forum Discussion

Conversions & Hybrids LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

Tach pulses per revolution

Thread Tools Search this Thread
Old 01-13-2006, 05:27 PM   #1
Conversion master
Thread Starter
iTrader: (1)
Join Date: Dec 2001
Location: Gig Harbor, Wa
Posts: 861
Default Tach pulses per revolution

How many tach pulses come from the PCM per revolution. I think it is 2? Is it a 5V squarewave signal?
70 LS1 is offline   Reply With Quote
Old 01-13-2006, 05:39 PM   #2
sawzall wielding director
iTrader: (4)
G-Body's Avatar
Join Date: Sep 2004
Location: Downers Grove, IL
Posts: 3,101

Yes, the computer puts out 2 pulses per revolution (4cyl output). I am not sure what style signal it is but you can convert it to 4 PPR (standard 8cyl output) by using EFI live 7 or HP Tuners.
G-Body is offline   Reply With Quote
Old 01-14-2006, 09:38 AM   #3
Teching In
Join Date: Jun 2005
Posts: 9

Hey jeff,
I donít know if you remember me consulting you on tach problems on my vette. Any way itís an 81. I rebuilt the tach and hooked it directly to the signal from the PCM It works but I suspect that it off a bit. Iím very happy that the tachometer moves again. I just need to get my hands on a programmer and check if the PCM is set on 4 or 8 cyl and play with it.
zamika0a is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Need Help Setting Parameters for Speedo bshyster65 PCM Diagnostics & Tuning 10 09-23-2015 04:53 AM
Changing speedo settings = bricked computer??? HELP! Lil'John PCM Diagnostics & Tuning 12 02-08-2011 10:59 AM
Gen 5 Camaro ABS Hub reluctor teeth count tijoe Gen 5 Camaro Suspension Tech 3 10-20-2010 03:05 PM
tach signal-4 pulse to 8 pulse?? chrisp3 Conversions & Hybrids 20 06-26-2007 02:31 AM
VSS- 4L60E (LT1 style) sender mated to LS1 pcm CHarris Conversions & Hybrids 13 01-24-2007 06:39 PM

53, conversion, converting, corvette, cpu, impulses, ls1, output, pulse, pulses, rev, revolution, revolutions, setting, steps, tach, tachometer, tachometers

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 07:53 AM.

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:
Your question will be posted in: