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Car Forum / BMW Cars / June 2006E39 525 TDS TOURING (1997): Scarse acceleration
Hi all, I am new in this newsgroup and so please excuse me if this topic has been already dealth with in the past. I recently bought a 2nd hand E39 525 TDS Touring (1997). It is in very good conditions and it has "only" 150.000 Km (not so much in 9 years). Now, before the E39, I had a completely different type of car (Ford Mondeo 2.0 16V, stolen), which makes me a bit unsatisfied about the performances of the E39 in terms of acceleration. To better explain, if I accelerate when I am at less than 2000 rpm the car does not react at all, expecially if I am in 4th or 5th gear. I checked at BMW the general conditions of the electronics and everything seems to be OK. So maybe the car is like this since its design. Is it normal according to your experiences ? Someone suggested me to perfom a chip tuning, but I am a bit worried as I would not like to damage the engine, which is in very good conditions but it's not new. Do yo have any suggestion on this ? Do you know any chip tuner in ITALY (Roma) who is really professional and reliable ? There are so many advises that you cannot easily distinguish the serious ones. Thanks a lot in advance for you precious inputs. Alberto yeeeees, there is a bit of a lack of power in my old 520 too it hardly moves at all when cold still I love it and have adapted to the more "economical" style of driving If you want to go fast, start with a 535 > Now, before the E39, I had a completely different type of car (Ford > Mondeo 2.0 16V, stolen), which makes me a bit unsatisfied about the > performances of the E39 in terms of acceleration. The Mondeo is lighter and has a four cylinder engine which might well be tuned to produce more torque at low revs. > To better explain, if I accelerate when I am at less than 2000 rpm the > car does not react at all, expecially if I am in 4th or 5th gear. It is geared for exceptional economy in the high gears - not performance. > I checked at BMW the general conditions of the electronics and > everything seems to be OK. So maybe the car is like this since its > design. > Is it normal according to your experiences ? BMW sixes are designed to rev, so drop a couple of gears - you'll find it really starts pulling at about 3000 rpm and will be happy right the way up to the red line. Many four cylinder engines are rough and noisy if you do this...  Signature*When it rains, why don't sheep shrink? * Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. >> Now, before the E39, I had a completely different type of car (Ford >> Mondeo 2.0 16V, stolen), which makes me a bit unsatisfied about the [quoted text clipped - 18 lines] > to the red line. Many four cylinder engines are rough and noisy if you do > this... Agreed. Give it some revs, then it will go! > Hi all, > [quoted text clipped - 10 lines] > To better explain, if I accelerate when I am at less than 2000 rpm the car > does not react at all, expecially if I am in 4th or 5th gear. Your comparing a gasoline engine to a diesel one. Not entirely fair at low revs. The turbo kicks in at about 2,000 RPMs. If you want quick acceleration, try to shift a bit later, so that the next gear engages at 2,000 or over. Don't be afraid to let it roar; the 6 cylinder diesel sounds great. > Hi all, > [quoted text clipped - 24 lines] > > Thanks a lot in advance for you precious inputs. Alberto This is a small diesel engine with a turbo in a fairly large car. The turbo will not operate much below 2,000 rpm, so compared with a 2.0 16V Ford the following effects will be noticeable: - Heavier car. Diesel not petrol. Turbo not operational at low rev's. Higher gearing (Fords are notoriously undergeared). So IMHO this is correct operation. If you want to accelerate quicker change down (e.g. to third). Next time ge the auto where this will happen automatically. > Hi all, > [quoted text clipped - 24 lines] > > Thanks a lot in advance for you precious inputs. Alberto Hi Alberto, I purchased a 1998 model 525TDS in 2001 with 60,000Km, it now has 195,000Km. This engine came before the much higher powered 2.5 and 3 litre engines. The 2.5 TDS has 144bhp, the multi-valve, common rail injenction 2.5 has over 160bhp and more torque further up the rev range. The TDS is only 2 valve per cylinder so will not respond higher up the rev range as the newer cars do. I brought the car for comfort, longevity and good highway fuel consumption..which so far it has delivered! In my experience the car is noisy and slow when cold, I soon learned it was not a good idea to try joining a fast road before the engine has warmed up. A work collegue has the newer engine which is much faster but he has had a lot of problems with it..the TDS has been around in the E34 model before and is much steadier and more durable by all accounts. I believe there are aftermarket 'chipping' available but in my opinion its best to use a car as it was meant to be used...I even swapped the 17 inch wheels for the orginally specified 15",,which probably tells you a lot about the way I drive! good luck David > In my experience the car is noisy and slow when cold, I soon learned it > was not a good idea to try joining a fast road before the engine has > warmed up. So what do you do? Sit on the M25 slip road with the engine running for 20 minutes? Oh, hold on, that's actually possible, if not inevitable, on most M25 slip roads. |
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