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#1
11-06-2004, 12:57 PM
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missing a gear?
the 87 190e 2.6 i bought recently seems to be running awful high rpms at highway speed (3000 @ 62mph) is the over drive not engaging - is there a lock up torque converter on the car? i haven't got any manuals on the car yet
(last week i did notice the atf was low added 2 qts of redline synthetic) i only feel 2 shift points when in drive, should there be 3. 
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#3
11-07-2004, 12:02 AM
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I'm pretty sure the 190 has the same transmission as the 124 series- there isn't an overdrive- it's 4-speed. Since you have an earlier model your transmission probably starts in 2nd, hence only 2 shifts: 2-3 & 3-4.
Mine I think runs around 3000-3500rpm at 70-80ish.
__________________
1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys Last edited by chazola; 11-07-2004 at 12:07 AM.
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#4
11-07-2004, 05:21 AM
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Quote:
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#5
11-07-2004, 09:33 AM
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The speedometer gearing is set up for the 849 revs/mile of the OE 185/65R-15 tires and the axle ratio is 3.27:1, so revs at 60 are 849 x 3.27 = 2776.
Tires with a different revs/mile spec will not effect this relationship, but they will impact speedometer accuracy, and as previously stated, the auto trans starts in second gear unless you floor the throttle. Fourth (top) gear is direct and there is no "overdrive". Duke
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#6
11-07-2004, 11:26 AM
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Quote:
However, in the case of an automatic, with a fluid coupling, the actual rpm at 60 mph is going to be 200-300 higher than 2776, and, hence the posted 3000 rpm figure.
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#8
11-09-2004, 02:19 PM
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Quote:
Under cruise load a non-lockup torque converter will have some slippage, but I doubt if it's more than about 3 percent, which would only be about 100 revs at 3000. Plus there's some inherent error in the speedo gearing and the speedo and tach head calibration and our ability to accurately interpolate between the hash marks. If the tach/speedo readings are within three percent of the calculation, then it can be considered okay. Duke
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#9
11-09-2004, 06:20 PM
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Quote:
Quote:
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#10
11-10-2004, 12:46 AM
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No, a fluid coupling and torque converter are different animals. A fluid coupling provides no torque multiplication. A torque converter does. If you've been around long enough to understand the original GM Hydramatic you understand this!
Production cars do not use "high stall" torque converters. Drag racing cars and hot rods only. High stall converters yield very poor fuel economy. Duke
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#11
11-10-2004, 01:19 AM
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Quote:
Quote:
My 300 SDL uses a high stall torque converter. The 190 mentioned above uses a high stall torque converter. End of discussion.
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#13
11-10-2004, 11:20 AM
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how many MB forum members does it take to change a lightbulb...?
__________________
1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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