Well . . . I thought I was going to bring Kermit back home today, but I just can’t get the electrical right. I may have made matters worse 😦 . I had everything working and the bus wouldn’t start. DAMN . . . novoltage to the coil. I saw the the coil wire the the ignition was not connected. When I connected it . . . POOF. . a little smoke. I discovered that the coil wire from the coil was on the wrong fuse. I corrected that and everything was fine… well except that when the lights are on, so are the brake lights…. of corse no break lights and the right turn signal doesn’t work. With the lights off the right signal in the rear is realy the flashers . . . Dragola . . . BUT. I did find a guy in Coldwater that has experience in VW electrical work, so I left the bus with him. The good thing though is when I did take him out, he ran strong at 50 / 55 mph (according to GPS). The speedo cable broke so when the electrical is fixed, I’ll replace it. Another positive note is that I got the wiper moter going. Just tok it apart and worked the armature for a while, but when I connected the wires . . . POOF . . . Hopefully Pete will get me going again.
Tag Archives: GPS
So I wanted to calculate the RPM to see if I ran the engine too hard. From what I have calculated, I don’t think so. The speedo was 11MPH off according to my VZW Navigator GPS. I checked the tire size on the bus VS the tires that came stock. The stock tires were 6.40 – 15, which according to a vintage tire size conversion they were P195/75R15, or P205/70R15. The tires that are currently on the bus are P215/75R15. Why is this important? We need to understand the what the tire diameter is in order to know the speedo correction. By using the handy-dandy tire size calculator tells me that the im either 4.5% or 7.5% too slow. Which tells me something else is wrong with my speedo, or there is another variable I’m not considering.
Now for the calculation. The variables i need are the following.
tire diameter – 27.7
4th Gear ratio – 0.82
Ring & Pinion – 4.125
Reduction Gearbox Ratio – 1.26
Constant – 336
RPM = (MPH*336*Drive Ratio)/Tire Diameter
Drive Ratio = (ring & pinion * Gear * RGB Ratio)
Given that I kept the speedo at 50 to 55 MPH, which translates to 61 to 66 MPH. That equates to 3153 and 3412 RPM. From what I can gather, as long as I keep the engine under 3500 RPM I should be fine. However I have read that the best cooling is around 2800 to 3000 RPM, so I was probably pushing it some, but I don’t think I ran the motor too hard unless the tuning was off. That I’ll never know at this point.