Boxster 986 2,5 top speed per gear

[78F350]

Originally Posted by tommy583

I wish my 2.5 would go 100 mph in 3rd or 170 mph in 5th. I'm not sure about this chart.

The chart is about the mechanical linkage, not engine power. Shaft from the engine inputs rpm1 to the transmission, transmission outputs to driveshaft at rpm2, wheel circumference rotates over asphalt at a rate of 'distance' per 'time'. Find a long down hill slope and it should work.

[tommy583]

Originally Posted by 78F350

The chart is about the mechanical linkage, not engine power. Shaft from the engine inputs rpm1 to the transmission, transmission outputs to driveshaft at rpm2, wheel circumference rotates over asphalt at a rate of 'distance' per 'time'. Find a long down hill slope and it should work.

The chart in the back of my 2.5 owners manual has a little different chart. This chart reflects what I see when i'm driving the car. 6,500 RPM's in 3rd gear = 86 MPH GPS verified or 89 mph on the speedo.

[78F350]

Originally Posted by tommy583

The chart in the back of my 2.5 owners manual has a little different chart. ...

Sounds good and I think that you actually have the *correct* answer for the OP's question then. I didn't post the 5-speed chart and I don't know the source. I bet it's from a 2000 or later. It matches up with the chart from the online version of the 2003 model (AV1 142 in the top right).