V-8 Vehicle Speed Sensors (VSS), Speedometers, V8 Conversions

V-8 vehicle Speed Sensors (VSS), speedometers, speedometer cables

Stealth Conversions
Vehicle Speed Sensors — Speedometer Cables
See also Vehicle Speed Sensors — Reluctor Ring and Speedometer Clamp

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—>Now! Download entire Vehicle Speed Sensors chapter ! (Chapter 13 of our Chevrolet TBI & TPI Manual)
(Adobe Acrobat .pdf — if you need the free Acrobat Reader, go here)

Stealth Conversions began offering aftermarket vehicle speed sensors (VSS) for engine swaps in 1991. The speed sensors are smog legal for engine swaps, and have been issued CARB EO #D-371. Without a VSS, the Chevrolet Fuel Injected engines will not run correctly, and they will not pass a smog test.

Basically, the VSS tells the ECM how fast the vehicle is going. Most people think the VSS is only used for the lock-up torque converter. The VSS is also used to control the EGR valve, the charcoal canister purge valve, the electric cooling fans, idle speed, and air/fuel ratio. This is all explained in the Chevrolet shop manuals.

It must be emphasized that the VSS is used to control the idle speed when the vehicle is moving. Without the VSS, a vehicle may have stalling problems under certain conditions. Needless to say, this is dangerous. Raising the minimum idle speed with the adjusting screw can eliminate stalling, but the engine will still not run optimally without a VSS.

A lot of people think that running "closed loop" is best for fuel mileage. Closed loop simply means that the oxygen sensor is being used to monitor the fuel/air ratio. Some of the Chevrolet fuel-injected engines are programmed to run lean under certain conditions (called "highway mode") to improve fuel mileage during steady cruise conditions. Without a VSS, the engine computer (ECM) will not get the correct signals to run the engine for best fuel mileage. There are a lot of programs in the ECM that depend on the VSS. For best operation, the VSS needs to be connected and functioning.

There are four types of VSS signals required by the engine computer (ECM):
1.	The two-pulse (2000 pulses per mile) square wave (D.C. current or direct current) used on all TBI engines through 1992, all computer-controlled-carbureted engines, and on 1985–1989 TPI engines.
2.	A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is required by the 1990–1993 TPI, 1992–1993 LT1 engines, and 1990–1993 Camaro 3.1/3.4 V6 engines.
3.	A 40 pulse per driveshaft revolution speed sensor used on 1993 and newer trucks with automatic transmission, 1994 and newer rear drive cars (Camaro, Corvette, and Caprice) with the automatic transmission.
4.	A 17 tooth per driveshaft revolution speed sensor used on 1993–1997 LT1 engines with the Borg-Warner 6-speed transmission. An 11 tooth reluctor ring is used on 1993 LT1 engines with the Borg-Warner wide ratio (3.35 First gear) 6-speed transmission.

PLEASE NOTE: Our manual goes into greater detail on this topic! We regret that we are unable to enter into telephone or e-mail discussions concerning it, as we just cannot spare the time!

Vehicle Speed Sensor, VSS, Speed Sensors, Speedometer, V8 Conversions, V-8 Conversion

Vehicle Speed Sensors Offered by Stealth Conversions

Stealth Conversions Vehicle Speed Sensors
— from book: Chevrolet TPI & Engine Swapping

Stealth Conversions has several types of vehicle speed sensors designed for easy installation into vehicles that were not equipped with vehicle speed sensors. All Stealth Conversions VSS units have CARB EO numbers (#D-371) — they are smog legal for engine swaps.

Shown above are:

1.	The two-pulse square unit for all passenger car TBI installations, all computer controlled carbureted engines, and 1985–1989 TPI engines. 7/8-18 thread, .104" square drive.	5.	Four-pulse sine wave. Same as #4 above, except without extension cable. Also available for Toyota with 22 mm metric thread and .187" tang drive.
2.	Two-pulse for Toyota. Same as above, except for 22 mm metric threads, and .187 tang drive, which fits Toyota transmissions and transfer cases.	6.	Dual output 90° angle drive. Use on Jaguars with electric speedometers. Allows connecting two-pulse or four-pulse unit on other end for Chevrolet ECM. XJ-6 Jaguars must use tranducer from XJ-S.
3. 4.	Extension cable, 10" long, 7/8-18 female with .104" square drive. Four-pulse sine wave with 10" extension. Use for 1990–1993 TPI V-8, 3.1 V-6, and 3.4 V-6.	7.	Speedometer sleeve. This sleeve is used on 1982–1986 trucks with 700-R4 transmissions. It is made of aluminum and should be used with the above speed sensors. The plastic sleeve used on some cars with the 700-R4 is not as strong, and the threads strip easily.

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JTR engine swapping manuals are available directly from JTR, as well as through a number of retailers, including:
Summit Racing (S-10: Part #JTR-S10; Jaguar: Part #JTR-JAG),
JEGS (S-10: Part #116549; TPI & TBI: Part #117942),
Steve Smith Autosports (S-10: Part #S212; TPI & TBI: Part #S195), and
Classic Motorbooks (S-10: Part #116549; TPI & TBI: Part #117942; Jaguar: Part #118438; Datsun Z: Part #115501; Volvo 200: Part #122587). Follow the links to reach their web sites!

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