Friday, Feb 18, 2005 at 22:32
Hi Desert,
I am very suprised you found the 3.0TD a slug. My bet is that the airflow meter was dirty (did it have an aftermarket oiled filter???). While the Dtronic makes a very noticeable difference down low, up top you don't really notice the difference by the
seat of the pants because its already very quick. Also, I found it noticeably better after 20,000kms (currently 35,000).
As for the boost curve, it makes 354Nm at 1,300rpm (just marginally under the 4.2TD's max torque @ 2,000rpm). Its literally only at idle and just above that you really notice the lag, an auto totally masks this (mines manual). Average fuel economy around town is 11.5 l/100kms and high 10's in the country at a steady 100km/hr.
A lot of people say the 3.0TD must be stressed to make that sort of torque, but consider it has a compression ratio of ~17:1 while the 4.2TD has ~22:1. Also, the 3.0TD injects after TDC, unlike the 4.2TD, another reason why the 3.0TD makes such good power without being "stressed".
Basically the 4.2TD is old technology (but very reliable) while the 3.0TD is relatively new technology. Virtually all of the bugs have been ironed out of the 4.2 but the early 3.0TD still had the odd gremlin. While we can all debate forever about which is better, the bottom line is that the 4.2TD will cease in 2006 due to emission laws. So, like it or not, the 3.0TD is here to stay. The only question is whether it will have a big brother, a 4.5TD (the 3.0TD with 2 more cylinders)!!!
If one is considering buying a new vehicle, its future resale will be affected if the engine is superceded. Just take a look at the 4.5/4.8 GU's, there is a significant price difference between them now, more than the original difference. While some may claim the last of the 4.2TD's will hold their value, history shows that every superceded engine/vehicle has a significantly lower reslae that the model that replaced it. While economics is not the only reason to decide between 3.0/4.2, it should be taken into the equation as any new vehicle is a considerable expenditure.
But perhaps the most important is whether you are happy with it. There is no point in anyone buying a 3.0TD if deep down you really want a 4.2TD (or vice versa for that matter)
Cheers
Captain
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