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post #1 of 46 (permalink) Old 01-31-2014, 10:26 AM Thread Starter
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Cobalt Project

Me and my dad are starting an interesting project involving a cobalt and several other cars I am hoping the members here can help me with. It is a 1978 Ford Mustang II body and rear end that we are going to put a cobalt motor with the an AR5 transmission mated to it. My first question of many to come I am sure is how does the speedometer on the cobalt work?


Here are some pictures of the body as it sits.







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post #2 of 46 (permalink) Old 01-31-2014, 10:56 AM
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There's a VSS on the output shaft of the transmission.

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post #3 of 46 (permalink) Old 01-31-2014, 11:33 AM Thread Starter
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Coby what is that?

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post #4 of 46 (permalink) Old 01-31-2014, 11:41 AM
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Cool a costang or a mustbalt.....lol

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post #5 of 46 (permalink) Old 01-31-2014, 12:24 PM
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VSS = vehicle speed sensor
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post #6 of 46 (permalink) Old 01-31-2014, 01:29 PM
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The automatic transmission output speed sensor (VSS) is a magnetic inductive pickup that relays information relative to vehicle speed to the TCM. Vehicle speed information is used by the TCM to control shift timing, line pressure, and TCC apply and release.

The VSS mounts in the case at the speed sensor rotor which is pressed onto the differential. An air gap of 0.27-1.57 mm (0.011-0.062 in) is maintained between the sensor and the teeth on the speed sensor rotor. The sensor consists of a permanent magnet surrounded by a coil of wire. As the differential rotates, an AC signal is induced in the VSS. Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

Sensor resistance should be 1500-1650 ohms when measured at 20C (68F). Output voltage will vary with speed from a minimum of 0.5 volts AC at 25 RPM to 200 volts AC at 1728 RPM.

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post #7 of 46 (permalink) Old 01-31-2014, 05:03 PM Thread Starter
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What about on the manual cars?

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post #8 of 46 (permalink) Old 01-31-2014, 05:13 PM
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Same thing only the signal goes directly to the "ECM", processed then sent to the instrument panel via GMLan.

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post #9 of 46 (permalink) Old 01-31-2014, 10:53 PM Thread Starter
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The speedometer is giving me the most trouble right now on how to make this setup to work so far

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post #10 of 46 (permalink) Old 02-05-2014, 12:56 PM
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While I fully respect your right to pursue your project, I've got to ask, are you high? What would possess a person to take an antique car and adapt a modern, computerized engine into it? Unless you have some serious engineering credentials, I fear that this project is going to eat you for lunch. But even if you are successful, what's the point? You could take the money you're going to sink into this project and get a really nice Cobalt or a really nice Mustang, but instead you're going to have a one-of-a-kind that won't be as reliable as either one, and will likely require continuous re-engineering. When you go to sell it, you're going to have to find someone who shares your vision (if such a person exists). I hate to burst your bubble, but I think you'd be better building a Stang or a Balt, rather than a hybrid.

First thing to do is strip and restore that Mustang body, that will give you plenty of time to come up with a powertrain design. Hell maybe by then you'll come upon a scrapped newer Mustang that you can gut.

Last edited by Coby7; 02-06-2014 at 04:33 AM.
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