Pole Position Gas Pedal question

shumdez

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Hi, I just bought a PP cockpit and it came with no gas pedal cable. I decided that instead of spend the 26 dollars on a cable from arcadefixit, I would fashion my own.(how hard can it be!) (probably a bad idea) I have gotten string and hookup wire to work. The only problem is in test mode I go past the a0-90 range, usually between 8E and 67 depending on what I am using and the length. I had to wd40 the pot and move the pulley back to the flat spot(it was just screwed down on the round side) to get it to work at all.

Also my rough understanding is that when the game powers up it takes the resistance value from the pot and makes this 00 then reads the change from that initial value. Is this right?

Besides making the cable too long so it stops moving the pulley I don't understand why this won't work as the distance between the pedal fully open and closed is a fixed distance.

If anyone can help or shed some light I would appreciate it.
 
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I'm sure this has been posted about before but I'm watching this as well...I have two where the cables were unhooked, and for some reason I think I had a bunch of issues getting one set up last time. Its my understanding that the cable wraps around the pulley a couple times as well.
 
Don't know much about this as I don't have one, but one would assume that the pot should be centered first before hooking the cable up. Possibly even set so the center would be mid pedal press if that makes sense. Pots are all different on how many turns they are, so perhaps if it is not centered properly, even if it does zero out that you are reaching it's limit while pressing the pedal.
 
Don't know much about this as I don't have one, but one would assume that the pot should be centered first before hooking the cable up. Possibly even set so the center would be mid pedal press if that makes sense. Pots are all different on how many turns they are, so perhaps if it is not centered properly, even if it does zero out that you are reaching it's limit while pressing the pedal.


Okay this is good. I did not specify that I am following the instructions in the manual and making sure that when I start the process of connecting the cable the screw is pointing straight up. I basically have two lengths that I have used, one which looks really close to the lenght shown in the picture. This makes the pot turn the whole time the pedal is moving and one that is slightly longer to make the pedal only move the pot a quarter of a turn.

I hope this helps explain it better.
 
Are you certain the pot resets upon powerup? Perhaps there is a centering or zero out setting in service mode. Hard drivin is like that, you periodically need to center it. You would also think you would use the cable that makes it move all the time. Strange, maybe the pot is just bad and thats why the cable was missing, somebody gave up fixing it..
 
The exact pot setting is not critical, the board reads the pot value every time it boots and sets that as 00 and goes up from there.

Dick

This is what I thought it was doing. So if the pot is turning the whole time that I press the pedal and it doesn't end at the proper value, there must be something wrong with the pot. This and ranchdrsn's comment make me think that I just need to replace the pot and go from there. I know that Ken posted a comment about the replacement from jameco so I will probably try that.
 
I'm sure this has been posted about before but I'm watching this as well...I have two where the cables were unhooked, and for some reason I think I had a bunch of issues getting one set up last time. Its my understanding that the cable wraps around the pulley a couple times as well.

I bought another pot and got similar results. I just put an order in at arcadefixit for NOS cable and pot. If you are still interested I will let you know how it goes when they come in.
 
Okay the NOS pot and pulley came in today. Soldered the new pot in Black, green, then red looking from top to bottom. Put the pulley on the flat spot then followed the manual for hooking the cable up. Half turn to the notch then over the pulley screw twice then around one and a half turns. Hooked it up to the pulley spring and put it back in the cabinet. The value I get when pressing the pedal all the way down is 4E. I pass the A0-90 range and get all the way down to 4E.

From all I can tell it looks perfect. Anyone have any ideas about this?
 
From all I can tell it looks perfect. Anyone have any ideas about this?

Well, if you've eliminated the possibility of mechanical issues, time to consider electronic ones.

The input for the pedal is on sheet 8A of the schematics. You can follow it from the edge connector pin on the left. There are some diodes, resistors and caps in the circuit; then it goes thru a bilateral switch (4066) on its way to the ADC @ 8J. Finally, it's the 08XX custom before ariving at the main data bus.
 
Well, if you've eliminated the possibility of mechanical issues, time to consider electronic ones.

The input for the pedal is on sheet 8A of the schematics. You can follow it from the edge connector pin on the left. There are some diodes, resistors and caps in the circuit; then it goes thru a bilateral switch (4066) on its way to the ADC @ 8J. Finally, it's the 08XX custom before ariving at the main data bus.

I spent a minute thinking about it and when I start to press the pedal it was going backwards. I only copied the wiring from what it was when I got it. I flipped the black and red wire and now I am going in the right direction but I end at B5. So it is much closer now I might try just a single turn around the pulley screw, that should make it just a bit longer and end in the A0-90 range.
 
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