[BOTUS]

Hi Guys, I have a 2007 335d, on original stock software the car's not up to much. Had integration update in 2014 by main BMW dealership and it transformed performance and gearbox. Now far faster everywhere with it much happier to make power from 3000 rpm onwards and massive midrange. But both versions clearly have one stupid fault where take off for slow speed driving is just wrong (very slightly tamed by the later software).

It's impossible to pull away without the car applying too much power no matter how gentle you apply the throttle. Watching others drive it, they kangaroo down the road, as they keep backing off after it pulls too much for traffic work or normal use from junctions etc.

To unlock even more performance I had a re map by one of the big UK companies but I was not happy with any part of it. They messed with part throttle response, almost as if first 40% did nothing (which they said was to make the car controllable ...RUBBISH, it just made it crap) and even that didn't sort initial pick up for low speed and to me the car was mostly slower everywhere and creating lots more gear changes in part throttle use (I guess due to the dead first 40% pedal) !!!

Three maps later all of which had some effect, with one just having noticeably more at the top end but rubbish everywhere else. I'm going to try something else.

In real life do these maps work or do they bugger up the rest of the drivability for the sake of a bit of top end you're never going to use?

My last request was why wouldn't everyone want this:

1) To tame pick up for low speed driving. Why not try and reduce fuelling on 5% throttle application to give something like 30% less, between 610 to 850 rpm, by 20 % at 851 to 1000 and 15 % at 1001 to 1200rpm and use something similar where adjustment exist up to 10% throttle opening. Past 10% throttle and 1200 rpm do not try and modify pedal response / feel / mapping at all.



2) Clean up any obvious, emission, noise or gov testing economy blips BMW build in for anything below 30% throttle if it clearly detracts from drivability or economy in real driving.



3) If possible aim to eek out greater economy for normal motorway use in the region 2000 to 2300 rpm on light throttle (80 to 85 mph, equating to circa 20% or less throttle opening)



4) For throttle openings past say 30% give slightly more boost and fuelling as appropriate, to give general gain on the BMW curve when revs are above 2300 rpm and allow it to rev out more cleanly than the BMW map once past 4400rpm.



5) Remove speed limiter.


Any thoughts or knowledge around who re map the entire thing properly rather than bodge in a bit more boost and fuel on full chat ???

[dixy2k]

Do you have a Sprint Booster installed?

[BOTUS]

car is stock, what's the booster.... I had one by the company thats' been around the longest, cost 400 quid and should know what they are doing...

I see evolve are near me, do they map it all fully or just bodge a bit of top end?
http://www.evolveautomotive.com/e9x-.../335d-286_735/

[Puerto Rican 335d]

I hv RENNTECH flash and I dont that issue check the sprint booster I heard its amazing in our cars

[Ajs_435d]

Go ecotune mate they did mine, had dpf removal and mapped.

[BOTUS]

Originally Posted by ajs_335d

Go ecotune mate they did mine, had dpf removal and mapped.

just looking on their website... seems they do one version (of two) which is exactly what I don't want. Making lots of torque at low speed / light throttle application.

I have a GS1200 (BMW motorbike with the infamous 1200cc flat twin), this too is mapped by a bunch of jokers. Tickover 1200 rpm, redline 8500 rpm

1) Horrendous poor running at low revs (so bad unusable below 3000rpm as std)
2) A really nasty rough spot at 4500rpm
3) Massive hole in power curve when really pressing on at 6000rpm

Luckily you can buy decent stuff for bikes so you can see and play with the mapping, not just stuck with some blokes idea of how to fix it.

When I got the gadget secondhand it had a map on it so gave it a go it was rubbish. So went to get some base maps that they give as std, they too where rubbish and many of the owners uploads too were rubbish.

What most seem to want to do and the eco version of ecotune map states that's what they set out to achieve is to bolster torque until the throttle becomes redundant. Most of the bike maps meant that 10% and 40% throttle did the same thing, here not by delaying it, but managing to get 40% throttle output on 10% application. This is just horrid, the throttle is there to give control not stitch you up.

So I remapped it to give nice steady improvement over the stock map, it will now pull cleaning from 2000rpm allow you to ride using 2000 to 3500 rpm range which stock bike couldn't do, rough spot at 4500 is almost gone and 6000 rpm flat spot is also gone.

If you look how Honda build bikes, they make engines with very linear power curves because this is the best all round way to do it. And this is what I want for the 335d

[2deerwhistlers]

Diesels make torque in low rpm and dyno graphs are all full throttle runs..

[BOTUS]

Originally Posted by 2deerwhistlers

Diesels make torque in low rpm and dyno graphs are all full throttle runs..

first point I know, very happy with this, but I should be able to control it.
second point is a good one, I'd like to see the part throttle curves as well.

which kind of goes back to my question in original post. Does anyone know if any of the big players map the whole car properly, or just bodge a bit on full throttle?

[Puerto Rican 335d]

I hv RENNTECH im clocking 318 whp and 425 lbs torque on the wheels

[Ajs_435d]

The ecotune map is custom tell them what you want, it is very linear and I'm coming from a turbo s2000.