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| Thread ID: 95585 | 2008-12-11 01:13:00 | Manual or Automatic | Roscoe (6288) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 727670 | 2008-12-12 03:14:00 | Funny - I was told that OD should never be used around town - only on the motorway . Something to do with placing excessive strain on the gearbox/convertor or something :( That's really olde and antique info there Zip . In the Olden Daze, OD was a hang-on part to the tailshaft of the transmission and yes . . . it would not like it to run in OD at low speeds . The new ODs are IN the transmission and not hanging onto the outside just before the driveshaft . That being said, things have changed, but car salesmen and elderly fathers haven't . They still cling to the old ways and don't really understand the products they are so negligently selling to the unsuspecting public . Since OD cannot be entered until the correct roadspeed and engine RPM and throttle position is all green-lighted and a GO . . . . you aren't really in OD anyway! 1,2,3 and THEN OD is the way it happens; you don't get into OD until the last green light is lit and THEN it goes into OD! There are a lot of other factors involved in the qualifying green-board, but for the moment, they are kinda hi-tech and require more than 30 words, to the chagrin of SOME people! |
SurferJoe46 (51) | ||
| 727671 | 2008-12-12 04:05:00 | You explained it far better than I did Joe... Thanks People just get too technical about cars when they have limited knowledge. They are such simple things to drive nowdays (cars, not people that is) I was a good many years in the trade but that was on Morris 1000, Hillman Minx, Morris Oxfords etc. I don't even lift the bonnet now (Hood) Much to complicated under that) Bit like a woman is a car... I can understand and admire the outside panelling and paintjob, but under the lid? .. now that is another story. Ken :lol::lol: |
kenj (9738) | ||
| 727672 | 2008-12-12 04:34:00 | I too like to be retired, but it leaves a lot to desire . Somehow I find I am busy-er that I was when I worked for a living . The free-clinic mechanic is IN . At least everyone believes that anyway . lol Time really flies when one is enjoined in lively one-on-ones and it is always a pleasure to help those people whom I consider as friends to exorcise ideas that aren't bonifide or true . We all have something to say (at least MOST of us do) and it's a lot of fun for me to hear the ideas of people standing on their heads in Upsidedown Land and it always amazes me that the same ideas and misinformation exists there too . I become verbose . . . well, not really to my mind . . . . . but I guess all I am trying to do is make a point clear as possible . Those particularly long tirades are from my being here with a keyboard, DSL and me aching from my latest medical intervention . . . so I just write and answer as much as I can to make the pain go away . Other times I just C/P, but then I am accused of theft . . . so I can't really win all the people, all the time . |
SurferJoe46 (51) | ||
| 727673 | 2008-12-12 06:50:00 | One good thing with driving on an island (NZ) is that you don't get to any high velocities there like we do here. Ok SJ, time to let you in on a secret 'cos you're pretty close to being a Kiwi now. We don't actually have roads and cars - we just pretend. We still use horse and carts and we got this new-fangled invention last year called electricity, that powers a couple of computers and the PF1 website. I hear we're getting running water next year so you may want to visit sometime soon! :) |
andrew93 (249) | ||
| 727674 | 2008-12-12 06:57:00 | Running water we have had for a while here. Being able to stop it when you've had enough is proving a little tricky though. The country is actually surprisingly large compared with what a map may tell you. For instance, a couple of airports even have runways that run East-West with room left for a road at one end. |
R2x1 (4628) | ||
| 727675 | 2008-12-12 10:23:00 | Ok SJ, time to let you in on a secret 'cos you're pretty close to being a Kiwi now. We don't actually have roads and cars - we just pretend. We still use horse and carts and we got this new-fangled invention last year called electricity, that powers a couple of computers and the PF1 website. I hear we're getting running water next year so you may want to visit sometime soon! :) I think it's a criminal offence to let those secrets out! |
Cicero (40) | ||
| 727676 | 2008-12-12 18:57:00 | Was this a Toyota? They have a unique idea on what a transmission should do, . [/INDENT] 1989 Nissan Bluebird . |
pctek (84) | ||
| 727677 | 2008-12-12 19:30:00 | I was told the simple explanation: Overdrive gears are simply a lower ratio so that the wheels will turn more frequently than the engine does. Sounds to match the results I got with it on during take-off. |
pctek (84) | ||
| 727678 | 2008-12-13 05:20:00 | Running water we have had for a while here . Being able to stop it when you've had enough is proving a little tricky though . The country is actually surprisingly large compared with what a map may tell you . For instance, a couple of airports even have runways that run East-West with room left for a road at one end . It must be the Mercator Projection cone that makes your tectonic plate look small-ish I guess . When I was a very young child, we had square wooden wheels . When the corners wore off we replaced them with new square ones . It's so hard to soar like an eagle when one is surrounded by turkeys . |
SurferJoe46 (51) | ||
| 727679 | 2008-12-13 05:51:00 | I was told the simple explanation: Overdrive gears are simply a lower ratio so that the wheels will turn more frequently than the engine does . Sounds to match the results I got with it on during take-off . That would be true in another age of automobiles, but there was some other dynamic malfunction because you get to OD after all the other gears are gone through first . In an auto or manual transmission, it's the same thing: OD is the TOP or LAST gear in the sequence and is not accessed until you get there . It in no way affects the lower ratios or torque values . Typically, most transmissions have the next-to-OD gear as direct drive (1:1) so the engine is turning the same speed as the driveshaft, not the wheels . There is always the ratio of the differential to consider at that point and most of them run the gauntlet from (conservatively) 3 . 1:1 to 4 . 6:1 or so . That means that the driveshaft turns at a faster rate than do the wheels and therefor the engine is also turning that same (relatively high) driveshaft velocity . Even in OD, (and let's assign the arbitrary numerical value of OD as 0 . 75:1 or so) - the wheels do NOT turn the same speed since they go through another gear ratio change in the differential . Therefor, if the engine is turning 3,000 RPM, divided by the OD ratio of . 75:1 equals 4,000 RPM at the driveshaft into the differential which has a ratio of - say - 4 . 56:1 and that means that the tires are turning at 877 . 1929 RPM while the engine loafs around at 3,000 RPM . (Hopefully my math is OK tonight) . Multiply that numerical rate by the circumference of the tires and you get distance traveled per engine revolution Simple . . |
SurferJoe46 (51) | ||
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