Help Wimmer figure out his top speed!

[cawimmer430]

So my car is rated by BMW as having a top speed of 210 km/h. But I've often maxed out the car at 235 km/h (speedometer indicated) in the past. The speedometer will be ineffective at those higher speeds, but by how much?

How would I go about figuring out my true top speed based on say this image: I'm doing an indicated 210 km/h but with the RPM at 4,500 in 6th gear on the A/T transmission. As you can see I still have a lot of RPM to go. 235 km/h doesn't seem that far off as a top speed based on the RPM.





What would you guys need to accurately calculate it? 143-horsepower @ 6,000 RPM, 190 Nm of torque at 4,250 RPM.

Could not find the gear ratios for the 6-speed A/T so here they are for the 5-speed M/T (Hinterachs?bersetzung = rear axle gear ratio ).




More technical info: http://www.bmw.de/de/de/_common/download/shared/pdf/1_SH_datasheet.pdf

[SVT_Power]

I highly doubt the top speed on this thing would be gear limited, but if you were looking for that number, we need the tire/wheel information as well.

Edit: Here I found a site you can plug those numbers into - http://enormouslysideways.net/calc.html

[cawimmer430]

I highly doubt the top speed on this thing would be gear limited, but if you were looking for that number, we need the tire/wheel information as well.

Continental 195/55 R16 87H Premium Contact FR rated up to 240 km/h.

[cawimmer430]

I highly doubt the top speed on this thing would be gear limited, but if you were looking for that number, we need the tire/wheel information as well.

Edit: Here I found a site you can plug those numbers into - http://enormouslysideways.net/calc.html

Ah sweet! Will give it a try! But now I gotta watch Euro 2012!