Does VSS have to be hooked up on a six speed?
03-23-2007, 01:00 AM
#1
Does VSS have to be hooked up on a six speed? I was already running a t56 before I swapped to the LS1 and I wired the VSS up to an autometer electronic speedo. I have it hooked up the same way on this new six gear and my speedo works fine but i wanted to know if the PCM needs VSS input for anything or if I can leave it disconnected? I dont know if this has been covered before but search is wonky for me right now. Thanks
03-23-2007, 01:05 AM
#2
It uses it at some points I think for fueling calculations, other than that and I am sure it is not hooked up will be egr operation and skip shift. The way I ran my auto meter speedo in my monte was leaving the two wire running from the trans to the vss sensor intact and then just t'd in the signal to the speedometer with the vss high signal wire and it worked fine.
03-23-2007, 01:11 AM
#3
I was told that for a manual trans, the PCM doesn't really need the signal. For an Auto.. it needs it.
I have been running without it connected and it runs find. But as stated. It maybe used for something other than normal Engine operations and performance.
I have been running without it connected and it runs find. But as stated. It maybe used for something other than normal Engine operations and performance.
03-23-2007, 07:11 AM
#4
I thought it had to be hooked up... I left mine hooked up like it was in the 99 donor car. I ran my Autometer speedo off of the PCM output. The blue or white plug...not sure which, but I ran those inside just like the 99 had them and hooked up to them.
When Im coming to a stop, with the clutch in, my RPMs do not return to idle. They stay slightly elevated, UNTIL I hit a certain speed. Say, 5mph. Then they drop to idle. I assumed that was the way it was supposed to be.
That being said...my harness and PCM are for a 99 auto car, but it was all converted for a T-56. Not sure if that has any bearing or not.
Ill find out for sure when I get it tuned. I think Im going to have an M6 PCM flashed into mine, and then see how things go.
Justin
When Im coming to a stop, with the clutch in, my RPMs do not return to idle. They stay slightly elevated, UNTIL I hit a certain speed. Say, 5mph. Then they drop to idle. I assumed that was the way it was supposed to be.
That being said...my harness and PCM are for a 99 auto car, but it was all converted for a T-56. Not sure if that has any bearing or not.
Ill find out for sure when I get it tuned. I think Im going to have an M6 PCM flashed into mine, and then see how things go.
Justin
03-23-2007, 09:13 AM
#6
Hmm Well I have a tune booked next week and want to tidy up any details before i go to ensure all goes well. I already have a button wired in for the reverse lockout from my last set up so no biggie there. I suppose it likely not a big deal to splice my speedo into the LS1 harness and ditch my old wiring. I was just curious whether or not it is actually required for something else calibration wise etc. Looks like its not a big deal from what y'all say. Thanks guys
03-23-2007, 09:33 AM
#7
When Im coming to a stop, with the clutch in, my RPMs do not return to idle. They stay slightly elevated, UNTIL I hit a certain speed. Say, 5mph. Then they drop to idle. I assumed that was the way it was supposed to be.
https://ls1tech.com/forums/pcm-diagnostics-tuning/177230-stop-drilling-those-tbs-fix-stalling-without-computer-tuning.html
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03-23-2007, 11:24 AM
#8
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Looking through tables in HPTuners, I see the PCM on an 6-speed model uses VSS for EGR diag, IAC tweaking, MAF idle zone determination, deceleration fuel cut-off, idle proportional closed loop, LTFT idle cells, disabling main spark table, CAGS, reverse lockout, disabling Fan1, and to output signal for cruise and ABS. I bet it'll drive better with it hooked it.
03-23-2007, 11:37 AM
#9
Looking through tables in HPTuners, I see the PCM on an 6-speed model uses VSS for EGR diag, IAC tweaking, MAF idle zone determination, deceleration fuel cut-off, idle proportional closed loop, LTFT idle cells, disabling main spark table, CAGS, reverse lockout, disabling Fan1, and to output signal for cruise and ABS. I bet it'll drive better with it hooked it.
Thanks bro thats exactly what I was after
03-23-2007, 12:59 PM
#10
Yeah sounds like it does need the VSS for a few things. Good list there...
Im hoping for a decent increase in power...but maybe more importantly an increase in driveability when I get a tune. So we'll see!
CAM let us know how it goes when you go in for a tune!
J.
Im hoping for a decent increase in power...but maybe more importantly an increase in driveability when I get a tune. So we'll see!
CAM let us know how it goes when you go in for a tune!
J.