1998 LS400 rpm (engine speed) at 60 & 70 mph - Page 2 - Club Lexus Forums

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1998 LS400 rpm (engine speed) at 60 & 70 mph

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Old 01-02-14, 07:13 PM   #16
mm88
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thanks for your responses. I just wanted to make sure that I wasn't running into another transmission issue. The transmission in my other car (Acura TL, 2nd gen) went out while i was driving back in November, which is why I decided to look for a car with a more reliable transmission (tranny issues aren't fun...). The transmission in that car just went out without warning. no error codes, slipping, or flashing lights, but i did noticed that rpms were higher while driving before the transmission went out, which is why i started looking for a way to calculate the correct rpms for a given speed, so I could determine if a vehicle had a weak transmission. I feel a bit more relieved now about the issue after reading some of these posts & will update again after i get the vehicle inspected by the dealer on saturday (also planning to change fluids with synthetic ones when i get the chance).
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Old 01-02-14, 11:14 PM   #17
dengman
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OEM fluids tend to work the best on the LS400.
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Old 01-03-14, 08:55 AM   #18
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My '98 has the same rpm's as yours on the road. I questioned it at first as well because it is running higher rpm's than other V8 cars (like Cadillacs) with 4 speeds. I've counted the 5 gears from a standstill and it is in 5th at those revolutions. Still get 26 - 27 mpg on the highway. 4.0 with DOHC is a small V8 with a lot of spool.
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Old 01-05-14, 08:29 AM   #19
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Hi,

I run my 99 USA spec Ls today.
70 mph--> 2100 rpm about.
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Old 01-06-14, 02:00 PM   #20
mm88
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Just got the car back from the dealer, they stated that the transmission was ok & that it didnt need a fluid change at the moment. I found out that I do have some maintenance to do on the car (valve cover gasket, differential fluid change, left tierod end & front tires). I took it up there on saturday, but they were unable to finish, so they gave me a loaner car until they got a chance to finish. I was surprised they gave me one considering that this car is 16 years old now. Now im starting to see why people buy these cars, that treatment is pretty nice. I plan to buy the parts online & find a good mechanic to get the work done, but i guess this puts my transmission worries to rest for now. Thanks all for your advice & time!
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Old 01-06-14, 03:25 PM   #21
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Quote:
The transmission in my other car (Acura TL, 2nd gen) went out while i was driving back in November, which is why I decided to look for a car with a more reliable transmission
well congratulations, you now own the world's most reliable and durable transmission!
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400, 60, a650e, gear, lexus, ls, ls400, mph, ratio, rpm, speed, top

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