VSS signal ?
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Fleet Mechanic
Joined: Feb 2002
Posts: 1,483
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From: Tulare U.S.A.
VSS signal ?
Im installing a 97 460 engine, trans, and transfercase into a 73 crewcab. The problem Im running into is the speedo and VSS drive( the 97 uses a VSS in the rear end) . What I would like to do is install a transfercase from a 89-91 F-250 for a speedo and VSS drive. Ford used a VSS with a cable drive comming off it in thease years. What I need to know is the signal from the trans or transfercase mounted VSS the same as the rear end mounted VSS signal?
Thanks in advance for any help
Leadmic
Thanks in advance for any help
Leadmic
Post Fiend
Joined: Jan 1997
Posts: 23,165
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From: Enjoying the real world.
VSS signal ?
One signal is used for anti-lock brakes (high pulse), the other for speedometer (low pulse rate)/shift. Even with a Truspeed you couldn't modify the pulse rate enough. You'd need a 555 chip or 74LSxx (don't remember the exact number as its been a while since I worked with TTL logic) as a multiplier/divider. If you go this route you may want to see if you can get a multiplier/divider at JDR Microdevices as you'll be able to wire it in without having to know the low level stuff. Let me know and I can look up the pulse rates for you.
Thread Starter
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Fleet Mechanic
Joined: Feb 2002
Posts: 1,483
Likes: 273
From: Tulare U.S.A.
VSS signal ?
Hey Ken, all I can say is Wow. I think Im going to have to learn some things if I want to complete this project.
Ok first off which chip are you speeking of and how will I know which one to get? I probbly will need the pulse rate. It still sounds easer than changing the rearend and the transfercase.
I thank you very much for your help Im a little over my head with the electronics in the case.
Leadmic
Ok first off which chip are you speeking of and how will I know which one to get? I probbly will need the pulse rate. It still sounds easer than changing the rearend and the transfercase.
I thank you very much for your help Im a little over my head with the electronics in the case.
Leadmic
Post Fiend
Joined: Jan 1997
Posts: 23,165
Likes: 18
From: Enjoying the real world.
VSS signal ?
You don't want to use a multiplier/divider chip unless you're familiar with electronics. Basically, they take a pulse and divide or multiply to get a new pulse rate.
Do a web search on www.google.com for "automotive pulse divider" and you'll find a wide range of "turn-key" products that will do what you need. I believe Steve posted the pulse rates elsewhere so you can use those numbers when selecting a pulse divider product.
Do a web search on www.google.com for "automotive pulse divider" and you'll find a wide range of "turn-key" products that will do what you need. I believe Steve posted the pulse rates elsewhere so you can use those numbers when selecting a pulse divider product.
Postmaster
Joined: Jan 2003
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Likes: 3
From: Durham, NC
VSS signal ?
Originally posted by webmaster
One signal is used for anti-lock brakes (high pulse), the other for speedometer (low pulse rate)/shift. Even with a Truspeed you couldn't modify the pulse rate enough. You'd need a 555 chip or 74LSxx (don't remember the exact number as its been a while since I worked with TTL logic) as a multiplier/divider. If you go this route you may want to see if you can get a multiplier/divider at JDR Microdevices as you'll be able to wire it in without having to know the low level stuff. Let me know and I can look up the pulse rates for you.
One signal is used for anti-lock brakes (high pulse), the other for speedometer (low pulse rate)/shift. Even with a Truspeed you couldn't modify the pulse rate enough. You'd need a 555 chip or 74LSxx (don't remember the exact number as its been a while since I worked with TTL logic) as a multiplier/divider. If you go this route you may want to see if you can get a multiplier/divider at JDR Microdevices as you'll be able to wire it in without having to know the low level stuff. Let me know and I can look up the pulse rates for you.
Post Fiend
Joined: Jan 1997
Posts: 23,165
Likes: 18
From: Enjoying the real world.
VSS signal ?
Its been a long time since I did any TTL (used to have a lot of fun putting together ISA interfaces!). Man, I miss some of the cool Z80 stuff! A counter is a divider (ie, 1 pulse out for every X in). Not in the sense of a ALU divider or a divide register though.
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
VSS signal ?
Originally posted by webmaster
Its been a long time since I did any TTL (used to have a lot of fun putting together ISA interfaces!). Man, I miss some of the cool Z80 stuff! A counter is a divider (ie, 1 pulse out for every X in). Not in the sense of a ALU divider or a divide register though.
Its been a long time since I did any TTL (used to have a lot of fun putting together ISA interfaces!). Man, I miss some of the cool Z80 stuff! A counter is a divider (ie, 1 pulse out for every X in). Not in the sense of a ALU divider or a divide register though.
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Post Fiend
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VSS signal ?
Used to love the instruction set! It had two identical register banks that you could switch between with one instruction. Really cool for multi-tasking on an 8 bit CPU.... 
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Post Fiend
Joined: Jan 1997
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From: Enjoying the real world.
VSS signal ?
Do a web search on www.google.com for "automotive pulse divider" and you'll find a wide range of "turn-key" products that will do what you need. I don't have specific product in mind, there are several that will meet your needs with a web search.
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Fleet Mechanic
Joined: Feb 2002
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From: Tulare U.S.A.
VSS signal ?
Hey Ken , I got to thinking about it and dont I need a pulse multiplier rather than a divider? I need to increase the pulse not decrease it. Do the make such a thing? I did a search and came up empty. Any ideas?
thanks for your help.
Leadmic
thanks for your help.
Leadmic
Post Fiend
Joined: Jan 1997
Posts: 23,165
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From: Enjoying the real world.
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