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2 minor issues...not sure if they are common...

CubSmurf

By CubSmurf
in 911, 912 Series

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CubSmurf Member

CubSmurf

Posted
Posted

So, I just bought the 87 Cabrio, with 5spd manual..and I have noticed only 2 small issues. First is, the speedo is about 10mph off. It does have aftermarket Borbet wheels. Is this a common issue? Anyway to correct it? Secondly, when first starting the car, it will idle and sometimes die. It fires right back up, and will go. But once the car warms up, no issues. Also, coincidentally, when the car first starts it runs just fine, but seems like when the car warms up it REALLY COMES alive! The car never misses, or runs badly, but when it warms up it feels MUCH stronger. Is this common?? I appreciate the info!

CubSmurf Member

CubSmurf

Posted
  • Author
Posted

The wheels are 17" Borbets. So, I know that will have something to do with the discrepancy. Didn't think it would be that m uch though. But as long as I know, it's no big deal. I looked around, and it looks like the plug wires need to be replaced. So, I think that might be my culprit as far as the running goes. Will check the sensor if the wires don't do it. Thanks!!

magcuda Member

magcuda

Posted
Posted

17" wheels yes, but what are the tire sizes? if they are not porportionate to the original size it will throw the speedo off.

CubSmurf Member

CubSmurf

Posted
  • Author
Posted

Found out the previous owner, did it intentionally when he put in white face gauges. He was getting a lot of speeding tickets, so he adjusted the needle! lol. at least I know I am not crazy!! thanks all!

  • 2 months later...
SkipC Member

SkipC

Posted
Posted

Go to Tirerack.com and input your current wheel and tire size. Then input the original wheel & tire size. You are looking for the tire diameter. Divide the new diameter by the original diameter. The result should be the factor the speedo is off. If its not and your numbers are correct, there's a problem with the speedo, assuming everything else is original.

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