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RPM at varying speeds

C

chowgar

Spa-Francorchamps
Joined
10 Aug 2014
Messages
327
At 70 mph approximately what rpm should you be at in a 997.1 S. Thanks people.
 
Largely depends on what gear you are in... :wink:
 
John H said:
Largely depends on what gear you are in... :wink:
Click to expand...

In 1st gear that would be around 7400 to 7500 RPM.

. . . . Oh, wait. That's not the question. Factually accurate though. :eek:
 
In my 997.1 3 K revs is 77mph according to the speedo
 
Big Phil1 said:
In my 997.1 3 K revs is 77mph according to the speedo
Click to expand...

Thanks Phil. I'm getting around that figure too. Since my rebuild, the mph has slowly increased at 3000 rpm. Soon after getting the car back, it was 70mph at 3K rpm, but has since increased to your quoted figure.
 
chowgar said:
Big Phil1 said:
In my 997.1 3 K revs is 77mph according to the speedo
Click to expand...

Thanks Phil. I'm getting around that figure too. Since my rebuild, the mph has slowly increased at 3000 rpm. Soon after getting the car back, it was 70mph at 3K rpm, but has since increased to your quoted figure.
Click to expand...

I would love you to explain that one to me.
 
This can happen when the slave pulley of the CVT pair is manufactured using a softer material and it becomes worn away during use.

The slight reduction in the pulley circumference effectively increases the velocity ratio of the gearing - ie a higher road speed may be achieved for the same original engine rpm.

Basically, the slave pulley will need to be replaced, or the master pulley machined down by the same %.

To avoid future wear, ideally upgrade both pulleys to titanium cones, but in any case, make sure the auto tensioner is working (slack in the CVT belt will result in excess slippage and pulley wear).

Standard kit PN: 997.553.780.08

PM me for the the upgrade kit PN.
 
Oh ok..these ones?

nieuwesecundair.jpg
 
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