Hayabusa

Tremendous typo that, of course I meant "I'm"

I interested in this and wondered how this would work with the electric motor. If you tune the petrol part will this be out of sync with the power of the electric motor (I'm which case they would wear out competing with each other),, or does the electric motor just accompany the power whatever? Just my own ignorance really. Would be really interested if you've found any more as I'd like to safely attempt that on my rx450.

I looked into this and wondered how this would work with the electric motor. If you tune the petrol part will this be out of sync with the power of the electric motor (I'm which case they would wear out competing with each other),, or does the electric motor just accompany the power whatever? Just my own ignorance really. Would be really interested if you've found any more as I'd like to safely attempt that on my rx450.

Just to clarify the only thing that has changed is that it was pressure washed on sat!

I've just noticed my 2010 rx450 do the same a few times today for the first time. No discernible change in weather conditions or anything else obvious unless it is a reaction to being pressure washed etc? Very strange feeling though.

Ok so new Avon coopers ordered for tomorrow @170 fitted. These tyres were recommended by the garage have had good reviews including clarkson for topgear on a rangerover and whilst I don't rate his technical abilities any higher than my hamster, I reckon he can probably tell a decent tyre. The garage have convinced me to switch the old rears to the front and to have the new wider tyres on the back. Works for me.

Right, checked with insurance and all is well. However to qualify that I've completely thought about this, I've tried another size site (as per the last thread (many thanks Lydiamight!), which shows less of a difference between the two tyres (7mm instead of 10mm) which even further re-inforces my thoughts. The final thought that occured to me was that changing sizes would be fine on a 2WD however those keen observers out there may have noticed that I actually only need front tyres. This means that rear drive operating at the same speed as front drive will work against each other (rear running too quick). I have additionally thought about this and think that this is still acceptable for one reason. At present my front tyres are down to the wear indicators (At least the wear indicator is still flat with the tread so it must be still borderline ) Now that point aside, the rear tyres still have good tread left and my contention is that the lost tread is probably tantamount to the same if not more than 7 or even 10mm rolling radius that the change in tyres will provide. Clearly this is only a short term issue until the rears wear down and are changed too. Anyway, not necessarily recommending this way of working, but at least its out there for consumption and its short term.

OK, I've now found reference of someone on clublexus.com forums who has already done it however they've gone 275x55x19 (3% difference to speedo reading) on standard 19" rims. Think I'm happy with the choice, just need to confirm insurance tomorrow.

Well, I've spoken to Lexus service manager. Naturally non-commital and stated that whilst the additional width will probably fit, he'd not recommend it for many reasons, but could only name insurance. I'll check further. I've been quite reassured about the width in the wheel arch as the following sites confirm; wheelfire.com (yanky site) state that the 2010 RX450h can be fitted with a 275x45x20 or a 265x35x22. performancealloys.com (UK site) also support the 2010 RX450h up to 275 on a 20" Think I'm set at that. Will check insurance tomorrow which just leaves the question of whether the 19" rim will accept the tyre. The main issue is that at this point I'm not sure of the rim width on the current 19"? Anyone?

My 2010 RX450 is currently running 235/55/19 101/W tyres and is ready for a new set (at least on the front). My driving style is occasionally hard and I notice that when pushed the front appears to be scrabbling for grip. Replacement tyres at this spec are £193 fitted each. So, having done a little investigation I've found that; If I change the tyre and profile to 255x50x19 it will give me a rolling radius difference of 0.5% i.e. indicated speed will be 0.5% more than actual speed (232.82cm becomes 231.72cm). I understand this to be an acceptable threshold when considering a tyre uplift. Additionally, this tyre puts you into land rover territory which means that the tyres are much cheaper £160 fitted for Yokos, and if you're that way inclined you can get a budget tyre for £110 (I would imagine that the budget has a grip rating very similar to teflon so I'm not wanting those). I do acknowledge that there would be additional resistance from the road that could affect how quickly the electric is operating for but for the size of the car I'm thinking that the tolerances would be less than noticable. The added bonus is that it would give me a little more rubber contact on the road and potentially assist with traction under my graceful driving. As I've scoured the internet and cannot find anyone that has done this before, does anyone know if the 255 will even fit in the wheel arch and does anyone know of any other pitfalls that I've not considered here? Thanks in advance, Steve.

For what it's worth, I'd try the following. 1) Delete the phone from the car (it sounds like you've already done this bit) 2) Delete the car from the phone 3) Do a full power off of the phone (hold the power button at the top and do the confirming swipe to continue power down). 4) Completely power off the car 5) Switch all back on again and try repairing If that fails, it may be time to call a priest (or your Lexus dealer of course).

I have the iPhone 4 with the latest software on connected to my RX450. Contacts sync quite happily. My only problem is that either the iPhone or the car drop my bluetooth signal for about 5 seconds periodically during a call. The call stays connected to the phone for the duration and then all of a sudden all is back and operational again. As far as the caller notices, my radio came on for a few seconds and then it all goes quiet as the car kit kicks back in again. Local dealer is looking in to it.

Just for completeness I thought I'd add the final update with regards to Lexus customer service handling of my DAB. I have now had confirmation that the installation is technically correct and that the DAB add-on is what it is and my problems are down to weak signal (despite having DAB for 3 years with flawless signal in these areas). It did get actually quite petty in that they even refused to tell me who developed their in car audio system too stating that their technical team were not privy to that information. A few minutes studying the manual actually showed me the Pioneer audio certificates which was quite disappointing to find after that response. No indication that anything would be investigated for the future or any interest in the fact that a competing brand was far superior than theirs. Ah well... I'm now out to seek enlightenment with a car audio specialist I guess. On the flip side, I still love the rest of the car!

Well, I've just had my RX back, rattles resolved from the centre console. AC ducting reconstructed and glove box rattle resolved however I still have one on the passenger door. DAB reception problem has gone how I'd feared though. No fault found. Can you get larger antennas for these at all? I'm assuming that they're just fitting someone else's DAB aerial kit and thus I can get better ones and DIY it! If anyone has any information I'd be grateful.

Mark, your point is bang on, for my mind it ticks all boxes. Economical if you want it Big engine for performance if you want it Big car with lots of room Luxurious Cheap to tax Cheap on company car tax I don't have to pay congestion charges when I go to London Just been out in snow and the hybrid snow mode really stabilises things a lot. To be fair, it was a no-brainer choice for me.

If it helps, on the back of this forum I've been running a test on economy driving and have a few easy tips (getting me an average 37mpg easily on winding country roads with stops, roundabouts, inclines/declines and a little town driving). First of all - I drove everywhere on cruise control. For those that don't use it much this will take some practice but essentially even if you are in a 30mph zone the car will automatically be "feathering the throttle" and eco mode will be running far more. Typically you will find that controlling the pedal yourself will result in you eventually following the speed of the car in front and not the speed limit. As we get 10% allowance in the UK and your speedo is normally a little out I normally set cruise control at 32-33mph for 30mph zones. Going through the visual road side speed reminders flags me at bang on 30. As an added bonus, you get to avoid being dinged by speed cameras. Second, anticipation of the road ahead. This must be done to maintain a smooth ride with step 1 or you'll be jumping on the brakes all of the time to compensate for getting too close. Basically look at the far distance (those of you who have had advanced driving experience should be good with this) to see where your next potential stop or slow zone is going to be and observe the following rules of the game. The aim is to cancel cruise control at just the right moment to head into a roundabout without touching the brakes AND keep the ride smooth. At first you may roll up to a junction a little quick (but you can typically feel that it will be too quick from about 3-400 yards away, just engage S and drop her down a cog to increase the kinetic charge to the battery (as the handbook puts it!), to the rest of us laymens, "changes down a gear". Obviously I would not condone not using the brakes in an emergency (why did I feel the need to caveat/qualify that!). Third, gentle acceleration. Get up to speed with the throttle and engage cruise control with "Set" i.e. tap down on the lever. Fourth, most of these mpg figures are supposed to be carried out at 56mph and although there is wild speculation as to how these are conducted, you'll find in some cases cars miraculously seem to hit a sweet spot around there. If you're on single/country roads try cruising around 56. I actually find this quite entertaining to do and helps to focus your attention on the road conditions ahead. Those who have done advanced driving will clearly have the additional "reading the road" tools of looking for hedge rows, clusters of street lights, reflections from headlights etc. and really turn it into an involving drive. I'm going to stab at this not necessarily being everyone's cup of tea, but it at least works for me. Now that's done, back to listening to the great sound from the loud pedal...I'd really missed that!

Well this all sounds like too much of a coincidence not to be related. I'll mention this to the dealers when they are looking at it. I've noticed the reception appear sometimes (but not always) to go ropey when going over uneven ground so this sounds highly possible. Thanks again!

It sounds like at least some of the issues experienced are most probably about driving style. I have never been shown how to drive the hybrid correctly as the previous poster mentioned but (and I feel a little a little embarraced by even saying this) I did read the manual. I'm ashamed to say that this tells you a number of useful points including the previously posted that should help. I have also read in the forums here about people experiencing an increase in their MPG once they've done more mileage. Maybe it could be partly down to early days? Highly unlikley that mine will ever see any descent fuel economy as I like the sound when you press the loud pedal too much at present. (had to modify as the opening paragraph related to my first post as it was left from my far longer and more rambling initial stab!)

Thanks to all. I've had a lot of cars in the past and as I spend a lot of time in the seat I quite like having a variety of entertainment. Swindon Andy has hit the nail on the head in that there's nothing that I want to listen to on FM. Fingers crossed for a week on Tuesday when hopefully that along with the annoying rattling noise from the centre of the dash will be sorted out, but that's a different topic of discussion! Apart from that I love the car which quite frankly ticks all boxes required of it. Sorry, special thanks to Rillo for the suggestions. I'll give the "push test" a bash (not literally) tomorrow and if the dealers fail to resolve it, it'll be out with the tools to do it myself!

Hi, I took delivery of my RX450h two days ago after a long time searching for a new car. Previously, I had a BMW 5 series and with that I had DAB. Having only pulled out of the car park for a mile or so I could immediately tell that there was a difference. On my way to work (approx. 30 miles) the BMW only used to cut out on the national stations at one point and that is in a valley where the road is densely overgrown with trees and I can understand the reception not being able to penetrate the thick canopy. Outside of this it was flawless for the whole journey (and I've always used DAB for the entire 3 years that I've had it). My RX appears to be fading in and out and crackling fairly consistently to the point that I could take no more this morning and have actually reverted to FM now as it's far more consistent. I've booked it back into the garage a week on Tuesday but have a sneaky suspicion that I'm going to be told that this is it and there is nothing wrong. Can someone please provide any soothing words about their DAB being absolutely fine that may make me feel better about my choice of car?