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About reeac

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  • Lexus Model
    IS300h Sport
  • Year of Lexus
  • UK/Ireland Location

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  1. reeac

    Battery Spec

    Finally I realise that as that motor generator charges the traction battery then ,when starting the ICE it's bound to be powered by the same battery and the 12 v battery isn't involved. Been rather slow in catching on!
  2. reeac

    Battery Spec

    I'm aware that any starter motor takes very little energy in terms of amp hours but does the energy required for starting an IS300h come from the traction battery albeit via a dc to dc converter or is it direct from the traction battery?
  3. reeac

    Battery Spec

    I'm intrigued to see that the Yuasa battery says recommended charge rate 3 amps. Elsewhere I recall reading 4.5 amps. Either seems ridiculously low for in-vehicle charging - you'd need to drive a long way to recharge a depleted battery.
  4. I own a 1958 MGA sports car which has two 6 volt batteries in series to power the 12 v system. After restoration between 1981 and 1983 the first pair of batteries lasted 11 years and the second pair 10 years. After that I started having trouble with batteries which was eventually cured by converting to using a single 12 v battery. I believe that the problem was that the more recent 6 v batteries were intended for use in golf buggies and so were deep cycle and couldn't supply enough current for cold starts. I expect that true car type 6 v batteries are still obtainable but it's a possible pitfall if choosing deep cycle batteries. So called leisure batteries provide enough CCA (cold cranking amps) and have reasonable deep cycling ability and I always used them on my boat, finding that they lasted about 10 years.
  5. That oil certainly doesn't look clean enough. Possibly they didn't leave it draining for long enough or drained it when cold. I assume that the level shown is after the car has been standing for an hour or more .... if so then that level is too low. I used to do all my own car maintenance but apart from my tractor I leave it to garages now....either my local or else the appropriate dealer , and I've never seen evidence of such shoddy work.
  6. Given that the seats reportedly met or exceeded Federal requirements I'm surprised at the verdict. What, then, is the point of having these design/performance requirements?
  7. I seem to recall reading that it's connected via a DC to DC converter to reduce the voltage from 230 to a suitable level.
  8. Swapping to a new battery would be the easiest test. Might just be that the charging circuitry which feeds that battery from the high voltage traction battery has failed but that's unlikely.
  9. We've covered this earlier. I showed in a post of Aug. 29th that the variation from new to worn out tyre will be about 2 percent on diameter and hence on speedo reading i.e. 0.6 mph at 30 and 1.4 mph at 70 and I was claiming to be able to read the speedo to 1mph at best. I got the feeling though that I was being boring.
  10. My experience to date has been overwhelmingly with conventional rather than hybrid cars. I believe that the Lexus hybrid 12v battery is charged from the high voltage traction battery but I don't know whether it is given priority so as to always be fully charged. Even so, if it eventually fails it might just discharge the traction battery causing damage to it. On the other hand there may well be built in safeguards against this happening. Probably with such a complex car it's best to err on the side of caution and replace the 12 volt battery after around 6 years. The Toyota Hybrid Drive system has been around for about 10 years now so dealers must have some experience of 12 volt battery behaviour.
  11. There is a downside ..... cost. If you want max. reliability then it's a good policy. My recent experiences with batteries have been one that did 15 years with no failure and no charging from an external source (and on an annual mileage of only 3,000) and one that did 10 years before it started showing some problems but never failed to start the car. My sister in law got her car battery changed at 6 years and I thought that for her, aged 75, that was sensible policy. Horses for courses.
  12. At least we agree that calibration of digital instruments is possible. I suppose that as a retired scientist I'm used to precision in measurement as a basis for drawing sound conclusions. Also I assume that we all like perfection in paint finish so why not in other areas? Re boating, it's a big subject but we're talking sailing boats and speed through the water as measured with a mini paddle wheel and speed over the ground as measured with GPS (satnav in motoring terms) and wind speed and direction which enable you to judge efficiency of the sail trim, speed of tidal currents ,expected time of arrival and so on. Whilst there are sometimes speed limits through mooring areas speeding is very seldom an issue with a sailing boat.
  13. Update. My IS300h had its 3 year service today at the local Lexus dealers. They said that they couldn't recalibrate the speedo. which reads 30 mph at an actual 27 mph. This surprises me, it being a digital instrument, as way back in 2006 we were able to calibrate our new set of boat instruments using the satnav and following instructions which came with the instruments. Seems that I'll have to live with this error and the fact that my 13 year old Jazz speedo is dead accurate and my cheapish quartz watch has an error of less than 30 seconds a month.
  14. New engine makes me wonder if it hydraulicked. Must check the location of the air intake on my IS.
  15. My experience is that on our local roads you can't estimate the depth of water unless you see another car go through ahead of you and also the depth can increase rapidly with time as water flows off surrounding fields. If it looks serious then I use first gear and go very slowly but keep the revs up by slipping the clutch. The biggest hazard is water ingestion into the engine so you need to know how high up the air intake is. In my Jazz it's pretty high up in the front wheel arch and reasonably protected from inflow due to forward motion. I would be a lot more cautious with the Lexus.