Tach or Voltage?

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bryantobando

Copper - Posts: 64

Joined: November 29, 2005

Location: United States

Posted: December 14, 2006 at 9:29 AM / IP Logged

When I install, DEI remote starts, I always set it to voltage since it is easier. Is it better though to use the tach wire instead or are they both the same?

mobilecustoms

Silver - Posts: 397

Joined: November 04, 2005

Posted: December 14, 2006 at 9:40 AM / IP Logged

tach is better, but voltage is easier but some cars do not like it. it needs the tach signal

bbtaco

Copper - Posts: 119

Joined: November 03, 2002

Location: Virginia, United States

Posted: December 14, 2006 at 9:48 AM / IP Logged

It is better to use the tach signal.

tbone587

Copper - Posts: 167

Joined: January 17, 2005

Location: United States

Posted: December 14, 2006 at 9:55 AM / IP Logged

tach is definately more realiable in my opinion, but voltage is easier to do if you dont have the time to find a tach wire.. If you are running a hoodpin wire into the engine compartment its usually a smart idea to run the tach wire in there as well. This way you can hook up the tach wire while your under the hood, or if its your own vehicle you can set it to voltage and then find the the tach wire at a later date when u get more time.

brcidd

Copper - Posts: 274

Joined: January 07, 2005

Location: Ohio, United States

Posted: December 14, 2006 at 10:00 AM / IP Logged

I've seen a weak alternator- not allow the voltage method to work- in which case the tach was used- I use the voltage method about 70 % of the time- with no comebacks--

The new databus modules (GM - SL I believe) now have the tach signal available as an output from the databus bypass module- to feed directly into your r/s brain- so no wires to run underhood-- I have yet to try one of these- but sure does sound nice for the installer....

Brcidd - Engineer That Does Remote Starter Installs on the side.

bryantobando

Copper - Posts: 64

Joined: November 29, 2005

Location: United States

Posted: December 14, 2006 at 10:35 AM / IP Logged

is there a reason though why tach is better than voltage..?

mobilecustoms

Silver - Posts: 397

Joined: November 04, 2005

Posted: December 14, 2006 at 11:20 AM / IP Logged

voltage is a guess when the car is on. if the car starts voltage will still crank the starter for the preset time. Tach monitors the engine for over rev and the tach for when the car starts and cuts power to the starter so it does not wear out the starter prematurely.

Tach is easy to get at any fuel injector or coil usually.

05gt

Silver - Posts: 628

Joined: October 30, 2005

Location: British Columbia, Canada

Posted: December 14, 2006 at 11:22 AM / IP Logged

also the idata modules have a tach output to hook up to , so no tach wire goes to the engine compartment, this is for GM and some Chrysler vehicles

megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: December 14, 2006 at 6:49 PM / IP Logged

What is the function for this 2 wire..Tach and voltage...From the manual its said..To check engine...Ist correct, if the auto start cranking the engine..But fail to start..this either 2 wire will detect either the engine already start or not...If the engine fail to start...The auto start will try to start again automatically...without need to to off and on again the autostart...

Coz i facing a problem in the morning..Autostart fail to start my car...I wait another 3 minutes..But the autostart not trying to start again...What I have to do...I have to use my remote to off and on again the autostart...for 2-3 times...than auto start can start my engine..In worst scenario...I have to start using key....This happen only in the morning after my car rest for the whole nite..

Any idea why?

Thank You

jerry_m

Member - Posts: 3

Joined: December 06, 2006

Location: United States

Posted: December 14, 2006 at 11:05 PM / IP Logged

If you have a problem with your r/s not working in the morning and dont have a tach wire hooked up you can do two things hook up your tach or bump up your crank time i recomend both just for that longer crank time on them cold days

jerry_m

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