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Rec.Autos.Simulators Archive

PDPI and T2; steering right also steps on the gas?!

3 posts by 3 people · 31 May 1999 - 01 Jun 1999

Hi all, A weird thing happens with my PDPI L4 and T2 wheel setup; when steering to the right, I can see in the calibration screen that gas is somewhat employed. The same for a left turn; some braking is visible. Not too much (about 1/20th of the total range) but still, this is ofcourse the thing that's stopping me from becoming a Graeme Nash ;-) I use the axis swap box. Has anybody had this behavior too? It's strange because you would assume the 2 axis are electrically separate. Ruud van Gaal MarketGraph / MachTech: http://www.marketgraph.nl Art: http://www.marketgraph.nl/gallery
From what I've gathered about the PDPI card, it works best with low ohm range pots, 50k ohm or less. If you use a higher ohm pot, you can get the results you are seeing. There is an alternate way of setting the pots which improves the performance of 100k pots, but I don't know if it will work on a 250k pot like thrustmaster uses. If you want to read about this alternate method, go to the tech page at http://www.thomas-superwheel.com. The gist of it is you want the pedal travel to use the minimum side of the potentiometer's ohm range. -David Thomas Jr. Thomas Enterprises
Bubb 01 Jun 1999#471419
I've seen this also. I saw this happen before I got my a TSW2 and a PDPI L4. It also happened with my Thrustmaster Pro and AWE64 joystick port. I assume that because all axis use the same voltage source (+5VDC) that there is a certain amount of voltage drop between the axis inputs when the resistance changes as you turn the wheel/pedal. I was hoping that the PDPI card was going to solve this but I haven't seen a change since I installed the card. I'm not sure if this problem is even worhty of attention but it I am curious. Anyone have more info on this or have a solution? -Gary

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