 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / BMW Cars / September 2007Flat spots and hesitation o 730d anybody experienced this E65
Hi Folks I have a NEW (well 8 months old) E65 730d SE UK version with the 238BHP turbo diesel + Auto. The power and torque is phenomenal compared to my old E38 740i but there is a persistent flat spot or hesitation when pulling away from a rolling start. Example..... When cold no problems as I feel that the extra fueling on a cold engine covers this problem but when hot try to picture this. 30 mph lift of the throttle and on the over-run let the car slow to a reasonable speed to say exit a side road or when rolling up to the entry to a round-a-bout (not many in the US) and if the way is clear floor the gas pedal and NOTHING............... then Varoooooom! with neck snapping acceleration! Now my theory is that on the over-run the fueling is cut off to lower emissions and aid fuel consumption. This will, in effect, reduce the exhaust flow to the turbocharger and slow it down so no boost. When I floor the pedal it take some time - say a second or two to get the turbo spooling up and Varooooooom! Off we go again. Has anybody experienced similar situations? Anybody got any ideas that might cure this trait in such a lovely car? Sir Hugh of Bognor  SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK > Hi Folks > [quoted text clipped - 16 lines] > (not many in the US) and if the way is clear floor the gas pedal and > NOTHING............... then Varoooooom! with neck snapping acceleration! My guess is that you have hit the gas hard, so the [six speed] gearbox is changing down two or even three gears. There will be a delay while this happens and the ECU cuts the gas while the box swaps cogs. Diagnosis - correct operation. > Now my theory is that on the over-run the fueling is cut off to lower > emissions [quoted text clipped - 10 lines] > Anybody got any ideas that might cure this trait in such a lovely car? > Sir Hugh of Bognor > >> Hi Folks [quoted text clipped - 26 lines] > > Remedy - try a manual change to see if he's right! >> >>> Hi Folks [quoted text clipped - 27 lines] >> >Remedy - try a manual change to see if he's right! Diagnosis wrong and totally misleading. The fuel is not cut during downshifts only on the over-run and then until the vehicle reaches a constant speed or the throttle is touched. Problem caused by "adaptive" driving learning mode of transmission system. If one drives like a granny then the system behaves like a granny. My problem was that the vehicle had been driven as a demo for 3 months before it was shipped to the South Coast from Inverness in Scotland which is not race track country and demos do not usually include a bit of drag racing and drifting. Had the computer system cleared and rebooted today (free) and it feels like a different car --------- next is DDE reprogramming and a throttle response adaptor. Sir Hugh of Bognor SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK > Problem caused by "adaptive" driving learning mode of transmission system. If > one drives like a granny then the system behaves like a granny. My problem was > that the vehicle had been driven as a demo for 3 months before it was shipped to > the South Coast from Inverness in Scotland which is not race track country and > demos do not usually include a bit of drag racing and drifting. We may not have a race track in Inverness but we have lots of lovely twisty and empty roads ;-) If you're ever up here I'll show you a few...... I'll have a word with the boys in Calterdon (our local dealer) to spice up the test drives a bit ;-)) > Had the computer system cleared and rebooted today (free) and it feels like a > different car --------- next is DDE reprogramming and a throttle response > adaptor. Glad it's fixed :-) Modern cars are too clever for their own good. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price >> Problem caused by "adaptive" driving learning mode of transmission system. If >> one drives like a granny then the system behaves like a granny. My problem was [quoted text clipped - 14 lines] > >Glad it's fixed :-) Modern cars are too clever for their own good. Hi John Spoke with you the other year about a few oddities with my old E38 (email) 740i. They seem like nice guys at Calterdon but the delivery driver nicked 1/2 tank diesel on the way down. Still they sent me a nice cheque to cover it. This 730d is very nice - the only reason I got it from Calterdon is that they accepted my ridiculous offer and shipped it free. The car is loaded, TV, Sun glass, auto this and auto that and might just wipe my backside if I asked it too! Performed faultlessly touring France this summer 2.5K miles up to Andorra as well (the E38 did that marvelously too). Couldn't wait for the new 735d with the twin turbo engine so will probably get it chipped (reprogrammed to 289BHP0 and might get one of those throttle response thingies too - know anything about them - bit new and seen lots of mentions but no tests or trials......... weird! Sir Hugh of Bognor SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK > Couldn't wait for the new 735d with the twin turbo engine so will probably get > it chipped (reprogrammed to 289BHP0 and might get one of those throttle response > thingies too - know anything about them - bit new and seen lots of mentions but > no tests or trials......... weird! I've not read much about it either. Sounds like the perfect car though. I was dissapointed to hear that a 335d can only be ordered with an auto gearbox in the uk. Calterdon are generally pretty good. The head sales guy is a bit of a 2002 fan :-) The have a cat that seems to have adopted them, it gets Whiskas twice a day in return for keeping the mice down :-)) I have memories of drooling over a 2000 touring in their old showroom when I was about 9 years old. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price >> Couldn't wait for the new 735d with the twin turbo engine so will probably get >> it chipped (reprogrammed to 289BHP0 and might get one of those throttle response [quoted text clipped - 4 lines] >I was dissapointed to hear that a 335d can only be ordered with an auto >gearbox in the uk. With the amount of torque available you don't need a manual otherwise you would be forever changing gear. The power band is so flat and strong 1200 - 3500/4000 the 6 speed (with manual over-ride and paddle button for up/down shifts) auto makes it seem one gear and with a CLEAN auto-box computer like mine is now it would learn how mad you were and adapt as mine is doing (straight jacket on order). Actually when thinking about the 335D it is quite reminiscent of driving a dragster - foot down and no gear changes to top speed..............................Varooooooooooooom! >Calterdon are generally pretty good. The head sales guy is a bit of a >2002 fan :-) The have a cat that seems to have adopted them, it gets >Whiskas twice a day in return for keeping the mice down :-)) > >I have memories of drooling over a 2000 touring in their old showroom >when I was about 9 years old. SignatureSir Hugh of Bognor The difference between men and boys is the price of their toys. Intelligence is not knowing the answer but knowing where and how to find it! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK >> Couldn't wait for the new 735d with the twin turbo engine so will probably get >> it chipped (reprogrammed to 289BHP0 and might get one of those throttle response [quoted text clipped - 11 lines] >I have memories of drooling over a 2000 touring in their old showroom >when I was about 9 years old. John The throttle response adaptor - apparently a load of crap for £200+ This Greek guy claims to hold the patent http://www.sprintbooster.gr/en/ And this guy has written a "white paper" (technical) about it and it kind of confirms my theory that it is simply an amplifier and does nothing more than a heavy right foot would do. http://bipesauto.com/sprintbooster Well worth a read and possibly a download for posterity Sir Hugh of Bognor SignatureI used to be an Egotistical Meglomaniac - but now I'm just perfect! Hugh Gundersen hsg@h-gee.co.uk Bognor Regis, W.Sussex, England, UK > We may not have a race track in Inverness but we have lots of lovely > twisty and empty roads ;-) If you're ever up here I'll show you a > few...... Have to agree, have just holidayed in my X5 around the highlands - based from Inverness - and had great fun with the car :) |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.