Re: Can't Get New CO2 PPP Shifter to Shift
[Re: Dave Hall]
#2479536
04/08/18 05:51 PM
04/08/18 05:51 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
OP
top fuel
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OP
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Posts: 1,823
Wind Gap,Pa.
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It's either a "normally closed" or "normally open" circuit. Mine is setup to provide voltage to the solenoid and the other wire to ground. I know that the MSD RPM switch usually provides ground so the other wire would need a 12V source. Are you familiar with the MAC Valve? There's a #1,#2, #3 port. Not sure where the hoses are supposed to go. I had the bottle hose to #2 and shifter hose to #1 and vent on #3 and that did not work. Air was coming out of the vent. Then did the #1 to bottle and #2 to Shifter and #3 to vent and this does not work. Yellow wire from MSD to 1 black wire and other wire now to ground and no go. What can I be doing wrong? Set MSD shift light to 2000 rpm in 1st gear brought revs up to 2200 and held it and it didn't shift.
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Re: Can't Get New CO2 PPP Shifter to Shift
[Re: HR3128]
#2479658
04/08/18 10:31 PM
04/08/18 10:31 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
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Port #1 is Supply (pressure from the bottle). Port #2 goes to the shifter. Port #3 is the exhaust. Electrical connections should be +12V. on pin #1 & ground on Pin #2. As a test, connect wire from pin #2 to ground & touch wire from pin #1 to a +12. The valve should energize. If the bottle is connected to port #1, you should get pressure out of port #2. I understand but if I do it that way where does the yellow wire tie into all of this? it looks as as I got the ports correct. And thankyou for the reply.
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Re: Can't Get New CO2 PPP Shifter to Shift
[Re: HR3128]
#2479833
04/09/18 09:03 AM
04/09/18 09:03 AM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
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Sammy, Did your old shifter have a CO2 shifter or did you shift manually? If so, how was it connected to the MSD? Yellow Wire? Either yellow or brown/white wire can run the valve (close to ground) depending on programming in the MSD. First time running a CO2 setup. I have no idea what I am doing. I don't understand the (close to ground) statement. I'm new to this.
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Re: Can't Get New CO2 PPP Shifter to Shift
[Re: Sammy]
#2479836
04/09/18 09:09 AM
04/09/18 09:09 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Just means instead of completing the circuit by sending power to the coil of the valve, it sends a ground. Meaning, you have to wire the valve's coil to get 12 volts anytime the power in the car is on, and the controller sends a ground to activate the valve.
"use it 'till it breaks, replace as needed"
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Re: Can't Get New CO2 PPP Shifter to Shift
[Re: Ben Holt]
#2479993
04/09/18 02:38 PM
04/09/18 02:38 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
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OP
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I see this a lot. You do not need a relay to run the small MAC valve, it only pulls a few milliamps.
The issue is the MSD 7531. It will not fire off the shift light unless it sees the dark blue wire (2 step) activated. It's a programming part of it's internal logic. What I do as a test is hook everything up and turn the bottle on, then turn the ignition switch on. It will try to fire off the shifter solenoid on start up. If it does that it is wired up correctly.
Then just activate the dark blue wire and run it up to the 2000 rpm setting and it will work.
12 volts to one wire of the solenoid, yellow MSD wire to the other.
I don't run a transbrake so how do I trigger the blue wire? I was going to run one and have a transbrake button wired but my valvebody is not a transbrake, I went with a clean neutral valvebody, but I footbrake
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Re: Can't Get New CO2 PPP Shifter to Shift
[Re: Ben Holt]
#2480146
04/09/18 07:41 PM
04/09/18 07:41 PM
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Joined: Dec 2012
Posts: 1,823 Wind Gap,Pa.
Sammy
OP
top fuel
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OP
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Joined: Dec 2012
Posts: 1,823
Wind Gap,Pa.
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I see this a lot. You do not need a relay to run the small MAC valve, it only pulls a few milliamps.
The issue is the MSD 7531. It will not fire off the shift light unless it sees the dark blue wire (2 step) activated. It's a programming part of it's internal logic. What I do as a test is hook everything up and turn the bottle on, then turn the ignition switch on. It will try to fire off the shifter solenoid on start up. If it does that it is wired up correctly.
Then just activate the dark blue wire and run it up to the 2000 rpm setting and it will work.
12 volts to one wire of the solenoid, yellow MSD wire to the other.
Thankyou Ben very much, I had a transbrake button already wired sitting under the carpet for when I decide to try and use a brake. I hooked it up to my shifter, started it up, backed the car out. Put it in 1st gear, hit the button and came up on the converter to 2000 and it worked. Shifted right into 2nd. Perfect
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