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Messages - Chrispy

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General X5 Forum (E70) / Re: Electronic parking brake failed :(
« on: January 28, 2018, 09:04:35 PM »
I think the internal gearing system strips and that’s that.  It is possible to rebuild them if you can get parts, but BMW don’t bother.
By the horrendous squealing grinding sound mine made when it died that would figure. Considering the fact these things are used widely on VAG's and other manufacturers these days (my wife's Q3 has one, which funnily enough has also freaked out once, but electronically, and an ignition restart got it to let go) you'd have hoped they'd be more robust.

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General X5 Forum (E70) / Re: Judering at low speed / when wheels turned
« on: January 26, 2018, 07:55:13 PM »
I didn't say they improve transfer boxes. The system is all new. No point going into details. Type in google: Atc700 vs Atc450. Unfortunately, while they succeed on tyres tolerance and system response, they fail on clutch design hence judder/vibration. Its not only x5's. x3, x6, x1, 1,3,5,7 series share same problems.
Aha, OK thats more like it. :) Googling now.....

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General X5 Forum (E70) / Re: Judering at low speed / when wheels turned
« on: January 26, 2018, 03:34:09 PM »
A bit vague to say the least! I'd be curious to know what design improvements were made on the LCI / a certain year to make the drivetrain more tolerant to rolling radius differences etc. Not sure it matches up with other members experiences of having "newer" vehicles that still fail, like 2012's etc.

General X5 Forum (E70) / Re: Electronic parking brake failed :(
« on: January 26, 2018, 03:32:19 PM »
Wow - almost a full working week to fit it?  Just as well labour was included warranty wise! :(

Disgusting that the warranty doesn't reset when the new part goes on, but is dated from the fitting of the original. 

Yep, I'm going to stop using mine too if this is going to be the case as even the new parts seem to have no design improvements, they're just imploding.

General X5 Forum (E70) / Re: E70 smooth running - injectior problem?
« on: January 24, 2018, 10:56:56 PM »
I can only speak from my own recent personal experience. Since getting the car, on cold mornings the starts were always a little lumpy. We're talking approaching zero degrees. After say 5 or 6 seconds it would smooth out. A recent trip to a dealer for other works revealed a fault code for the glow plug control module, which made sense based on what I was seeing.

I'm not saying that's the cause of your issues but a lumpy start when cold on diesels "could" be glow plug related. Less so with modern ones as the injection pressures are so much higher now.

I'd have thought if you had injector issues they'd be present at all times, or at least other symptoms too like loss of power, poorer mpg, etc.

General X5 Forum (E70) / Re: Electronic parking brake failed :(
« on: January 24, 2018, 09:21:27 PM »
How did it go? Was Labour included?

Again the leap to non RFT's had interested me after I did the same in the E91 320d - the ride quality, and most noticeably the lack of tramlining afterwards. It was like night and day.

Assuming tyre pressures are all OK, with the softer sidewalls and with the use of * marked tyres I'm thinking it'd a safe enough bet that the radius of the tyres would be consistent enough to be safe on the transfer case. 

Got a good 6mm plus on all 4 at the moment (Bridgestone Duellers) so I'm a way off replacing them but as I said before, *marked was always going to be on the cards - I just wanted to know the science behind the difference and what other factors may unintentionally undo any benefits. I'll be re-checking the pressures at the weekend me thinks to make sure I'm close to the ones on the B pillar.

To clarify I'm not considering going for non * marked tyres but wished to discuss the logic behind the claims that they protect the transmission based on rolling radius tolerances etc. The information around cheapo ditch finders being that far out is by far the most telling and very interesting - I'd be curious to see how decent non * marked tyres fare on that front too, and then non RFT and so on.

Audi with the Haldex diff I think won't have such issues, not sure on the Mercedes front with the 4matic system. Would need to Google how that works.

As I say, just curious as to the actual real world findings re this, and it came to me when I was pumping my tyres up the other day and wondered about rolling radius etc.

So (and I'm playing devils advocate a little here I know) it's entirely possible that a combination of tyre pressures and tread wear front vs rear it's possible for the difference to be the same or maybe even beyond what would be present if non * marked tyres were used?  Could those be around 6mm out front to rear or left to right through manufacturing defects? 

Also, on the * marked tyres and a staggered setup, with a 50 profile front and a 45 profile rear, are * marked tyres compared to make sure both different profiles offer the same rolling radius, even with pressure differences taken into account? 

I'm just trying to rationalise in my own mind, the science behind the suggestion that * marked tyres are required to ensure the rolling radiuses (radii?) are close enough across front to back to keep the transfer case happy, especially with many other factors at play such as wear and pressures which can vary a fair bit with temperature too.

Reading elsewhere, a diff usually sorts this sort of stuff out so with AWD there's no wind up on tarmac and these kinds of things are just not an issue - tyre places insisting you replace all 4 tyres at the same time seems to be old hat.  If the XDrive system simply can't cater for that due to BMW's choice(?) to omit a diff is surely a massive oversight?

General X5 Forum (E70) / Re: Glow plug control module
« on: January 23, 2018, 04:58:35 PM »
Awesome.  I'll be honest I've not lifted the bonnet/ pulled the cover off yet to take a look but will do so and put my hand under the intake to have a feel around.  If I think that the 2x nuts and plugs are accessible enough blind and without alien fingers I'll give it a go.  Struggled to find info re the N57 although the 335d got a bit of attention re this on YouTube, that person removed the intake to do it.

Interesting! :)

So, even using recommended pressures all round, naturally increased wear on the rears resulted in a 5-6mm difference (reduction) in rolling radius which * rated tyres cannot prevent.  Sure, they will be fine when new (all round, assuming all 4 are replaced at the same time) but gradually get further and further apart as time/ miles go on.

So, even sticking to the * marked tyres there will always be a difference in rolling radius between front and rear - not to begin with but as time goes by, thus inadvertently adding strain/ wind-up on the transfer case?

I'm just doing some thought into the * marked vs non * marked thing, as no doubt many have previously done as when they're new I totally understand that there will be more of a stringent QA process to guarantee sizes, but as time goes by, with the wear of them (and possibly random pressures, which can also be temp dependant) this will be negated. 

Also, I'm talking front vs rear here, not left vs right, aimed at the transfer case primarily.

Hi all,

So I've been mulling this one over a little with regards to how sensitive these cars are to tyre size differences, and short of asking BMW (where I'm not expecting them to have the foggiest) I thought I'd post up some thoughts first.

Now as we're (mostly) aware, using * marked tyres is recommended due to the tighter checks around sizes etc and for the protection of the transfer case, but how do we stand when it comes to pressure differences and also different rates of wear between front and back, especially with the lack of a centre diff to soak up the difference?

The tyre pressures advised are higher on the rear than the front, and couple that with potentially different rates of wear (more at the front?) and potentially a staggered setup on the M's how do we stand? 

Do we not only have to use * marked tyres but also make sure they're within a certain amount of MM tread left across all 4, and also make sure the pressures are X PSI to guarantee as close a rolling radius front to back as possible?  The ABS uses rolling radius to detect tyre pressures being out so if the differences can be big enough for that to pick it up, surely that's more than enough to be damaging to the transfer box?

General X5 Forum (E70) / Re: Glow plug control module
« on: January 23, 2018, 11:40:11 AM »
I've not been told about codes on the plugs, just the control module so far - as such I'll replace that and see how it fares.  I do wonder if then it'll show up faults on the plugs themselves but it's a start I guess.

General X5 Forum (E70) / Re: Electronic parking brake failed :(
« on: January 23, 2018, 11:38:55 AM »
So, and forgive me if I'm simply not reading it correctly, are the parts and labour covered?  So if it failed again within 24 months BMW would replace the part for free (including fitting) or just the cost of the part? 

Admittedly the part did make up most of the cost but there was still a good £400 plus on labour after the dreaded VAT.

General X5 Forum (E70) / Re: E70 smooth running - injectior problem?
« on: January 22, 2018, 08:16:45 PM »
Are we talking really cold starts?  If we're into around zero degrees and below overnight mine is lumpy on start for a few seconds but sorts itself out fairly quickly, and I have a fault code on the glow plug module.  I take it you have no codes for that unit along side the existing ones?

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