retro fit speed comp volume radio in 3rd
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
retro fit speed comp volume radio in 3rd
was looking at one of the newer style mid to late 1990's GM CD players with the speed comp volume, im sure this works off the VSS somehow
anyway, is there any way to get it to function on a 89 using the VSS off the speedo that goes to the ECM
if so how do you go about doing it and what color wire do you use from the new radio
anyway, is there any way to get it to function on a 89 using the VSS off the speedo that goes to the ECM
if so how do you go about doing it and what color wire do you use from the new radio
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Joined: Apr 2009
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From: Springboro OH
Car: Many
Engine: Several
Transmission: Automatics
Re: retro fit speed comp volume radio in 3rd
was looking at one of the newer style mid to late 1990's GM CD players with the speed comp volume, im sure this works off the VSS somehow
anyway, is there any way to get it to function on a 89 using the VSS off the speedo that goes to the ECM
if so how do you go about doing it and what color wire do you use from the new radio
anyway, is there any way to get it to function on a 89 using the VSS off the speedo that goes to the ECM
if so how do you go about doing it and what color wire do you use from the new radio
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Joined: Jun 2005
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From: Bremerton, WA
Car: 1992 RS / 1989 RS
Engine: 3.1L MFI / Vortec 383 TBI
Transmission: T5 / LS-T56
Axle/Gears: 3.42 open / 3.73 Eaton posi
Re: retro fit speed comp volume radio in 3rd
I've heard that some have got it to work, I haven't been so successful with mine. Either the pulse count form my VSS (305 TBI is 2000 pulse per mile), or the SCV function in the radio doesn't work. Not something I'm going to worry about, I plan to amp the radio anyway with a line level converter.
The speedo feeds a buffer on the back of the cluster which outputs VSS to the ECM and cruise control.
The speedo feeds a buffer on the back of the cluster which outputs VSS to the ECM and cruise control.
Thread Starter
Supreme Member
iTrader: (2)
Joined: Aug 2007
Posts: 2,529
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: retro fit speed comp volume radio in 3rd
yea 
the buffer that goes to the ECM 
anyway, it would be nice to have, i like to ride with the windows down, so the SCV would be nice if you could get it to work........or i could just use my A/C
but im not even sure im going to put a SCV in mine, i got a good stocker, and a real real good Alpine if i want CD so IDK
the buffer that goes to the ECM anyway, it would be nice to have, i like to ride with the windows down, so the SCV would be nice if you could get it to work........or i could just use my A/C
but im not even sure im going to put a SCV in mine, i got a good stocker, and a real real good Alpine if i want CD so IDK
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From: p'cola FL
Car: 88 iroc-z/28
Engine: 408 lsx
Transmission: 5800 stall
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Re: retro fit speed comp volume radio in 3rd
pretty sure its a small green wire off the back of the radio harness for the newer model.
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