carb setup computer questions.
carb setup computer questions. ok i have a few questions but was unsure of which forum to post them in. but i figured this forum would yeild the best results.
i have a 95 camaro, i'm swapping in an ls1/t56 into it. i'm looking to go the carb route w/ the vic jr intake and the msd tcm. is there any need for me to run the original (95) or ls1 pcm at all? i would like for the interior accessories to still sork, and speedo and such. i have the harness from my lt1 and also the harness for the ls1. can someone maybe shed some light on this... any help is greatly appreciated, thanks in advance.
Nick
i have a 95 camaro, i'm swapping in an ls1/t56 into it. i'm looking to go the carb route w/ the vic jr intake and the msd tcm. is there any need for me to run the original (95) or ls1 pcm at all? i would like for the interior accessories to still sork, and speedo and such. i have the harness from my lt1 and also the harness for the ls1. can someone maybe shed some light on this... any help is greatly appreciated, thanks in advance.
Nick
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
You should not need any of the factory PCM`s at all. The motor will be controled by the MSD computer and I think that your BCM should control all of your accessories. You will need to hook up your gauges though, use LT1 senders for the oil pressure and water temp. The tach should plug into the MSD box somehow (never saw wiring diagrams for an MSD box so I don`t know exactly). The speedometer may require a little extra effort, the speedo will be looking for an 4000PPM square wave DC signal, and the trans will be sending a sine wave AC signal (I think the T56 has a 17 pulse per Revolution signal). You could either try finding a GM DRAC box that would convert the signal or go with an aftermarket speedo signal convertor like one from dakota digital.
These are the only problems that I can think of right now, but I have never looked at wiring diagrams for an LT1 car so I cannot be sure that these are the only problems you may encounter.
These are the only problems that I can think of right now, but I have never looked at wiring diagrams for an LT1 car so I cannot be sure that these are the only problems you may encounter.
ok excellent, thanks guys for all your help. so as it sounds the only thing i'll need to worry about is the speedo hook up. i plan on running aftermarket gauges for the water temp and oil pressure. if im not mistaken my fuel gauge will still work considering that i'll have the factory bcm in the vehicle. i already have a shiftlight/tach wired in that i'll be able to run off the msd.
tach wire strait to the wire for the tach in the cluster, and you can run the speedo strait to the cluster to, BUT, you will lose cruise control that way.
gotta have the BCM to perform the function, plus going to a calbe setup on the carb, not sure how you could hook up the electric cruise box, but im sure anything is possible.
you will reuse your lt1 oil pressure sensor, just need a metric adapter to fit it in the block.
volt and gas will work without any mods.
water temp will need to be hooked directly to the cluster if it goes through the PCM 1st, i cant remember.
sounds like a fun project.
gotta have the BCM to perform the function, plus going to a calbe setup on the carb, not sure how you could hook up the electric cruise box, but im sure anything is possible.
you will reuse your lt1 oil pressure sensor, just need a metric adapter to fit it in the block.
volt and gas will work without any mods.
water temp will need to be hooked directly to the cluster if it goes through the PCM 1st, i cant remember.
sounds like a fun project.
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Originally Posted by TJ
water temp will need to be hooked directly to the cluster if it goes through the PCM 1st, i cant remember.
sounds like a fun project.
sounds like a fun project.
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Originally Posted by G-Body
The water temp gauge will need to use its own sender. The 99+ LS1`s use a serial data signal to the computer which is not directly compatible with any gauges. So just use the sender that came with the gauge.
doesnt it go to the ECM 1st?
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Verdad Gallardo Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
Any gauge will work fine as long as you use the sender that goes with that gauge.
The temperature sender signal goes to the ECM first on 99 and newer cars. The sender output is a serial data signal which the ECM interprets and then sends to the gauge. To my knowledge there are no gauges that will work when hooked directly to the sender in a 99+ car.
On the 98 LS1s the sender has a dual output, one output goes to the computer as a serial data signal and the other goes directly to the gauge.
The temperature sender signal goes to the ECM first on 99 and newer cars. The sender output is a serial data signal which the ECM interprets and then sends to the gauge. To my knowledge there are no gauges that will work when hooked directly to the sender in a 99+ car.
On the 98 LS1s the sender has a dual output, one output goes to the computer as a serial data signal and the other goes directly to the gauge.
Originally Posted by G-Body
Any gauge will work fine as long as you use the sender that goes with that gauge.
The temperature sender signal goes to the ECM first on 99 and newer cars. The sender output is a serial data signal which the ECM interprets and then sends to the gauge. To my knowledge there are no gauges that will work when hooked directly to the sender in a 99+ car.
On the 98 LS1s the sender has a dual output, one output goes to the computer as a serial data signal and the other goes directly to the gauge.
The temperature sender signal goes to the ECM first on 99 and newer cars. The sender output is a serial data signal which the ECM interprets and then sends to the gauge. To my knowledge there are no gauges that will work when hooked directly to the sender in a 99+ car.
On the 98 LS1s the sender has a dual output, one output goes to the computer as a serial data signal and the other goes directly to the gauge.
i have an autometer sendor hooked strait to the factory gauge and its correct.
a set of autometers would be a nice touch tho.
