vss?
01-10-2003, 07:20 PM
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Car: 91 Camaro
Engine: 383
Transmission: 700r4
vss?
I was wondering if i change rear end gears do i need to change the speedo gears at the tranny or can you just change the road speed constant in the prom to correct the speedo reading for the ip cluster.
01-10-2003, 09:23 PM
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have you checked the diagrams over at the gmecm at diy-efi.org site. there schematics i dont have time top puruse them myself. but if it has a vss input and a dash vss output then you could just the input pulse counter to arrive at the correct dash speed. go look at the schematics let me know whats in there. and maybe traxion will pop in and lend some $8d know how.
01-14-2003, 07:21 PM
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Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: vss?
Originally posted by btcamaro
I was wondering if i change rear end gears do i need to change the speedo gears at the tranny or can you just change the road speed constant in the prom to correct the speedo reading for the ip cluster.
I was wondering if i change rear end gears do i need to change the speedo gears at the tranny or can you just change the road speed constant in the prom to correct the speedo reading for the ip cluster.
but it may be less complex on a T5 w/gears...
http://www.eecis.udel.edu/~dzug/92z2...0-vss4T56.html
mike
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01-15-2003, 10:02 PM
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Car: '89 GMC Pickup
Engine: 383 SBC Stealth Ram
Transmission: 700R4/VIG 3200
With Tunercat you can change the Road Speed Constant in the ECM Constant Tables to get the ECM to read the actual speed but the speedometer will still be off unless you change the gears to match. From 3.08's to 3.73's I went from 4007, which is what every binary file I've viewed was set at, to 5453 to get the ECM to calculate the correct speed.
There is also a Instrument Panel Vss Pulse Divisor but changing that only got me a speedometer that didn't work at all. I'm not sure what it does.
There may be a way to edit the binary file to get the speedometer correct too but I didn't. Just called a GM dealer and they sold me the correct gears.
There is also a Instrument Panel Vss Pulse Divisor but changing that only got me a speedometer that didn't work at all. I'm not sure what it does.
There may be a way to edit the binary file to get the speedometer correct too but I didn't. Just called a GM dealer and they sold me the correct gears.
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