XSeries-forum

I'm loving my E53 its a great car! Only slightly affected by the ZF 6 lurch (typical pulling off on a roundabout in 2nd, only to find no power and then wait....wait..... BOOM 1st gear and your off).

I suspect that this is somewhat exaggerated by the fact that as standard the torque peaks slightly later on the X5 than my old 530d (2000rpm V 1750rpm), so at very low revs in second there just isn't that much torque to get rolling.

Sports mode is fine, and from a full stop (rather than a rolling low speed start) sports and drive both pull off great... Its just the rolling to a roundabout, pulling off and finding there isn't much "oomph" ready.. 9/10 times even in drive it goes fine at roundabouts... I read in another thread someone suggested the computer just likes to give you a scare once in a while

Anyway.. To the point.

REMAP!. Are they decent gains to be made in low end torque, and does this help to mask the ZF lurch problem, or make it worse!.. I would have imagined that more torque at low revs the ZF can just stick with second and pull of a bit more abruptly without needing to downshift.

Secondly.. my OBC lies .. It's reporting around 35.3 MPG on combined in town + open road.. I've not done much motorway cruising, I can confirm I get better economy on a steady run.. Anyway, on my normal "mixed" driving, I've been using Road Trip app to keep some records, and the average is more like 27MPG. I'm not actually "upset" with that. The car goes great apart from the roundabout thing .... But if an Economy remap can give me a bit more low end torque without causing any gearbox issues, and give me a bit of extra economy at the same time.. I might be interested

So, Any opinions.. Especially if you've experienced the roundabout lurch problem and had a remap .

BMW say the car's software is pretty much up to date, I've not bothered to have them reset all the adaptations etc, I might try doing the gearbox adaptation reset see if that makes any differences.

Am I correct that the reset procedure for the ZF6 is the same as the 5 speed on the 530D? Engine off, Ignition ON, step on the throttle+kickdown and hold for 30 seconds to reset the adaptions?

I thought I would miss my 530D... have to say the X5 does make up for it.. It's a laugh driving it. Not quite a sports car, but it does hold the road far better than I had expected on our twisty local roads. And that's with stupidly cheap tyres fitted!

The hesitancy at junctions and roundabouts is common to the diesel, a remap off Jason seems to sort it out . That's is not the dreaded lurch that is talked about. The Lurch is when slowing to a stop, then all of a sudden there is a semi violent lurch forward into first, can be on either 5 or 6 speed zf boxes, not that common though.
As for recaps, we tend to use Jason ( BW chip tune ) London. You can go to him, or use one of his agents around the country, or hae can send out a tuning box that you can plug into your car, email your map for a rewrite and then install yourself £250 per map.
He also does gearbox software upgrades if needed. He is going to the Midlands meet if you are their, he has all his gear to do maps with him

If you visit www.thelurch.com they describe the hesitancy as the lurch variant two, as opposed to lurch version one when slowing to a stop. So I've just used that convention.

Variant 2 : In addition, when you slow very gently to a creeping halt without actually stopping and then gently try to accelerate - there is a slight hesitation when the engine revs higher, then the gearbox engages the drive wheels with a jolt. This varies from a harsh jolt to snatchy.

I don't have any problems when pulling up to a stop, the gearbox shifts down totally smoothly, even in sports mode where it shifts to first its still smooth as butter

But yeah, if the car's already in second and then you ask for a lot more, it can seem like an eternity waiting for the box to shift down to 1, and get moving! My thinking was that with a remap the extra torque would simply mean that the downshift to 1 was needed less frequently hence a better driving experience

Would certainly want to be careful not to introduce the full on lurch variant one, that's for sure, as I am 100% certain my car does not do that

Variant 2 describes exactly what I get occasionally. It's when I'm in traffic crawling upto a roundabout then go for the gap. The revs rise then it suddenly engages.  People don't expect an X5 to go wheel spinning across a roundabout. If a Jason re-map was to prevent this it would be money well spent. I'd need to know that it would sort it before shelling out tho as new tyres are first on the list.

I'm sorry to say that it won't cure lurch2.
It just means that as you launch onto the roundabout, you do so a little more quickly and then scare yourself as you hurtle towards the exit
I just select sports mode as I approach the roundabout and back into drive as you pull away. Simples


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I am neither mechanic, tuner or even a 3.0d owner, however.................

If I had a 3.0d with anything other than low mileage I would personally ensure the car is wanting for nothing heathwise before getting it remapped.

I would consider health of Oil, Oil Filter, Air Filter, EGR valve, breather, (fitting modified item if apropriate & depending age of car). I would also ensure throttle body, inlet manifold & MAF correctly cleaned.

It is obviously beneficial to ensure car otherwise well.......such as injectors all good etc.

Remapping a car wanting the above unlikey to harm it...........It just seems logical to ensure engine in fine form 1st especially if better efficency is desired.