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Proper RPMs for 2001 Sonata
I recently purchased a 2001 Sonata. However, during the first week, the transmission went, and had to be replaced by the dealer (with a used one). Silly me, I did not find out what transmission he replaced it with - the 3 speed or the 4 speed (It had had the 4-speed).
It seems to me that the car is running at higher RPMs during highway driving than I remembered it doing before. When I drove in to work today, it was doing about 2750 RPM @ 75 MPH? Does anyone have a table of the RPMs a motor should be doing at a given highway speed, and would a different speed transmission change that noticably? Is the 2750RPM @ 75 MPH excessive? Ineed to make sure everything is right with this transmission before I accept this repair. A little background history: The original problem was detailed here - https://www.hyundaiforum.com/m_12051/tm.htm. They ended up replacing the transmission speed sensor, and the problem seemed to only get worse after that, until the car became undrivable. It was jerking/jolting into gear at far higher than normal or reasonable RPM, and refused to shift out of 3rd gear. A transmission shop said there was something physically wrong with the transmission and it got replaced. |
RE: Proper RPMs for 2001 Sonata
What engine do you have? 4 cyl. or 6 cyl.?
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RE: Proper RPMs for 2001 Sonata
That's not bad for 75 MPH.
Two things you should be able to test: --manually shifting the automatic, how many gears can you select? --there should also be a lock-up torque converter. To tell if this is operating correctly, look for a double-drop in RPM as the transmission first shifts into top gear and then locks up the torque converter. Also, if you accelerate moderately in top gear, you should see the RPM jump by a few hundred as the torque converter unlocks. |
RE: Proper RPMs for 2001 Sonata
ORIGINAL: nmunafo I recently purchased a 2001 Sonata. However, during the first week, the transmission went, and had to be replaced by the dealer (with a used one). Silly me, I did not find out what transmission he replaced it with - the 3 speed or the 4 speed (It had had the 4-speed). It seems to me that the car is running at higher RPMs during highway driving than I remembered it doing before. When I drove in to work today, it was doing about 2750 RPM @ 75 MPH? Does anyone have a table of the RPMs a motor should be doing at a given highway speed, and would a different speed transmission change that noticably? Is the 2750RPM @ 75 MPH excessive? Let's start with the known facts: 2001 Sonata automatic: - 1st gear ratio = 2.842 - 2nd gear ratio = 1.529 - 3rd gear ratio = 1.000 - 4th gear ratio = 0.712 - Final gear ratio = 3.770 So when in 4th gear at 2750 engine RPM's the wheels are turning 1024.5 RPM. 2750 / 0.712 / 3.770 = 1024.5 Original tires: - 205/60-15 The diameter of that tire is 24.7" and that tire has 817.4 rev per mile. So if the wheels turning1024.5 revs per minute, multiply that by 60 and you get61,470 revs per hour. Now divide that by the tire rev per mile (817.4) and you get the Miles Per Hour. 61,470 / 817.4 = 75.2 mph For the record, speeds in 4th gear at indicated engine RPM: 1500-rpm = 41-mph 1600-rpm = 44-mph 1700-rpm = 46-mph 1800-rpm = 49-mph 1900-rpm = 52-mph 2000-rpm = 55-mph 2100-rpm = 57-mph 2200-rpm = 60-mph 2300-rpm = 63-mph 2400-rpm = 66-mph 2500-rpm = 68-mph 2600-rpm = 71-mph 2700-rpm = 74-mph 2800-rpm = 77-mph 2900-rpm = 79-mph 3000-rpm = 82-mph |
RE: Proper RPMs for 2001 Sonata
Just wanted to comment that I visit many forums, yet rarely do I come across such an excellent response.
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