Fahrleistungssimulation

Von dieser Software habe ich eine ältere Version :

Mein Urteil : wirklich gut bei sinnvollem Umgang mit den Daten

http://www.cartestsoftware.com

Da gibts auch eine limitierte Version, damit Ihr seht, was es für ca 40 US$ gibt.

Grüße, Stefan

Wenigstens können die physikalischen Größen alle ins metrische system umgeschaltet werden

Grüße, Stefan

Hi Freunde der guten Fahrleistungen !

Hier findet Ihr meine Ergebnisse der Evaluierung des Fahrleisungsprogramms von Pat Glenn.
Es gibt Nachbesserungsbedarf.
Lest den Brief an Pat von eben ...
Ich bin gespann auf seine Antwort.

Ich werde berichten ...

Grüße, Stefan

Hi Pat,

I start using your program . I choose the Audi TT 1.8 T / 225 hp

At normal conditions ( T = 20°C, p=990 mbar and hight = 200 m above see level ) could verify the result measured and puplished in different news papers.

Then I varied the geographical hight. My expectation is a decreasing top speed with increasing geographical hight, but it was increasing. This is not inline with physics.
Reason : The losses due to roll resistance depends on weight, speed, g, and roll resistance coefficent of the tires. So this loss is independent of atmospherecal conditions. The engines output torque at the clutch is a function of air pressure, geographical hight and temperature. So power and torque are proportional to the air mass load of the cylinders. The torque decreases with geographical hight, higher temperature and lower air pressure. If we substract the constant losses due to roll resistance, it yields in a lower power available at the wheels. Clearly : the power available at the wheels decreases more than the power needed to overcome the drag resistance of the car. The result : the top speed decreases with hight or lower barometric pressure.
Your program shows the opposite behaviour .
Next I will check the influence of the humidity.

I am one of these performance car enthusiasts doing performance simulation based on Excel for more then 8 years and also doing performance measurement using the equipment developed by race technology ( GB ) in order to validate the simulation results.

If you are interessed in a dialog concerning these details, please let me know.
Looking foreward for a cooperation.

Best regards from Mering close to Munich

Stefan

P.S.: did nobody realize this discrepancy till now ?