I find the car loud, mind you I'm more accustomed to other kinds of cars. I do a lot of highway driving and find that at about 120km/h its reving at about 3500-4000 RPMs. Sitting idle it revs at about 1000 RPM, which isnt that bad. I'm just wondering what could be the cause of the high RPMs, or if generally this is a normal reading while driving at that speed. Any ideas as to what I could test to see what the problem (if any) could be?
thank you \ nick
What is with people asking this question? Engine speed (while driving) is purely a function of the diameter of the wheels, the gearing and differential ratios, especially in a manual transmission. It's not like some mysterious formula and it has nothing to do with the engine. If its doing 1800 rpm at
60 km/h, it's gonna do 3600 rpm at 120 km/h. Its a linear function. To answer your question, VW's tend to have short 5th gears in order to give you better highway accelleration. If it bothers you, you're going to have to drop the transaxle and change out the gear or differential (or get a new car). Alternately, I suppose you could get absurdly large tires (although that could adversely affect your handling, and almost certainly would hurt your accelleration and braking in every gear).That said 1000 rpm seems high for idle speed, but thats completely unrelated to the engine speed while moving. Possible reasons for a high idle include bad sensor (oxygen sensor, coolant temperature sensor, etc), air leaks, stuck injectors, faulty idle stabalizer valve (not real likely), faulty ECU (not real likely), misadjusted throttle bypass, etc.
If you crawl under your car and get the transmision code you can use this to calculate your correct RPMs:
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