dei remote start tach wire utilization
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=89885
Printed Date: April 28, 2024 at 8:36 PM
Topic: dei remote start tach wire utilization
Posted By: new2mud
Subject: dei remote start tach wire utilization
Date Posted: February 01, 2007 at 12:24 PM
Do installers typically bypass the tach wire and go with the voltage sensing mode on DEI remote start installs, in order to not have to run a wire through the firewall to the tach wire in the engine bay?
If so, what is the typical configuration setup?
The one I plan to use is the Viper 160xv in a 1990 Lexus LS400.
Replies:
Posted By: Twelvoltz
Date Posted: February 01, 2007 at 12:29 PM
The absolute best way is to use a tachometer connection. The tachometer connection will run the starter only until it sees the proper voltage on the wire it is reading. If you do voltage sensing, the unit will crank the starter for the programmable amount of time and may not always start on the first try, especially with older vehicles.
DEI lists this for your tach:
Tachometer black AC at either ignitor
With this note:
LEXUS, LS 400, 1990, Tachometer
the ignitor is located on the passenger side behind headlight and air flow meter in a black plastic box. set module to the four(4) cylinder setting since each ignitor runs 4 cylinders.
Posted By: new2mud
Date Posted: February 01, 2007 at 3:01 PM
Thanks for the tip 12V!
Any tricks of the trade to get a thin wire through the firewall of a luxury car that is sound deadened to the max?
Posted By: russ lund
Date Posted: February 01, 2007 at 3:29 PM
I agree with Twelvolts.Until this year I only installed Ultra Start units and always used the tach wire.This year we added Scytek units and their tech guys told us to try them tachless.When it got cold the units I tried tachless don't always start.So go find your tach source and you won't be sorry.Russ.
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BigDog
Posted By: Twelvoltz
Date Posted: February 01, 2007 at 3:38 PM
I own a tool that looks just like this this. Makes life very easy.
And, just for the record...I am not 12V..that is the person who owns and runs this incredible site...I am twelvoltz (and have been since 95 when I was in the industry). 
Posted By: another-kelly
Date Posted: February 01, 2007 at 6:53 PM
i have those grommet tools myself. love them!! our other trick is to sharpen an antenna down to a point to go through rubber grommets.
Posted By: KPierson
Date Posted: February 02, 2007 at 8:32 AM
First of all, it's not a big deal to run the tach wire through the firewall with the power wire (depending on application), siren wire, and HOOD PIN wire. :) Always hook up tach, it will save you headaches down the road. ------------- Kevin Pierson
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