Go Back   MustangForums.com > Ford Mustang Tech > Classic Mustangs (Tech)
Sign in using an external account
Register Forgot Password?
Search


Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


66 Rally Pac

Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-08-2015, 10:19 PM   #1
Gitdyup
 
Join Date: Apr 2015
Vehicle: 66 Ford Mustang
Location: South Carolina
Posts: 2
Default 66 Rally Pac

I would like to install a Rally Pac. The problem is that I have not found one that will work on my 347 Stroke using a MSD 6AL ignition with the tech output going to a Holly EFI Carb. Note, I have MSD Blaster SS coil. Any suggestions?
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
Gitdyup is offline   Reply With Quote
Old 04-13-2015, 07:42 AM   #2
99GTvert
is my username.
 
99GTvert's Avatar
 
Join Date: May 2006
Vehicle: 1
Location: Earth
Posts: 12,480
well, its getting cold outside again...****in reached down to the 40s the other day.  almost can't wait for the snowy stuff............................almost i don't have a twitter account nor have i ever been to a twitter web page (update: i have), but if i ever did decide to take the plunge i will let you know by posting it in this awesome little box of text (update: not really)! i like tacos lol...though between crunchy tacos and soft tacos i cannot really say which one is better.  sometimes, the mess a crunchy taco leaves behind is a little annoying while the soft taco just doesn't have the same taste... cake is so much better than pie no, srsly.  **** pie. ****ing
Default

Moved to tech forum.
__________________
99GTvert is offline   Reply With Quote
Old 04-13-2015, 01:02 PM   #3
bop11
1st Gear Member
 
Join Date: Apr 2014
Vehicle: 67 mustang coupe
Location: PA
Posts: 115
Default

The tach output is a series of pulses, as long as the EFI and the electronic tach have a high input resistance, and they should have or they would affect the ignition, you can splice a wire into the line going to the EFI. Both EFI and tach just count the pulses but do not effect them. Since you have a mechanical distributor with vacuum and centrifugal advance this should work correctly.
bop11 is offline   Reply With Quote
Old 04-14-2015, 06:30 AM   #4
Gitdyup
 
Join Date: Apr 2015
Vehicle: 66 Ford Mustang
Location: South Carolina
Posts: 2
Default

When I hooked the EFI and the tach to the Tach output wire, they fight for the signal and the car will not stay running. Also, doesn't not have a vacuum advance.
Gitdyup is offline   Reply With Quote
Old 04-15-2015, 08:52 AM   #5
bop11
1st Gear Member
 
Join Date: Apr 2014
Vehicle: 67 mustang coupe
Location: PA
Posts: 115
Default

The old Ford tach are series tachs and goes between the ignition switch and the ballast resistor or wire not directly on the + side of the coil. The pink wire(resistance wire) is needed to make it read correctly which you may have eliminated with the fuel injection.
You need to replace the tach with a modern pulse counter as the old one is a volt meter. It averages the pulses per time into a voltage by means of the inductance in the meter coil. The faster the engine runs the higher the average voltage. This would surely load down the fuel injection system if you put the tach between the plus on the coil to ground.
If you still use the pink wire to feed the coil, you probably could put the tach in as originally installed.
Attached Images
File Type: jpg Tach Wiring, Faira tach.jpg (80.1 KB, 0 views)
File Type: jpg tach 2.jpg (54.7 KB, 0 views)
bop11 is offline   Reply With Quote
Old 04-15-2015, 08:52 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
rally pac, tachometer

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

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 11:51 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup