GolfGTIforum.co.uk
General => General discussion => Topic started by: A7 UFO on 25 February 2010, 11:37
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Anyone know what the difference is between the above two engines? (other than the fact one engine is +30bhp :rolleyes:)
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Turbo and mapping are slightly different.
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The 170 also has a dpf which arent without there problems. 140 with a remap is the way to go.
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Maps are different, turbos are the same AFAIK. Both engines remap to about 200bhp. Might be stronger internals or something on the 170 though?
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the 170 TDI found in mk5 is PD TDI.
The new 170 in the mk6 (GTD) uses
TDI® with Common Rail and Piezo Injectors The latest generation common rail system has one high-pressure pump and one rail per cylinder bank. The maximum injection pressure is 1,600 bar, 250 bar more than previous common rail systems. When piezo injectors are used for injection, a voltage is applied to ceramic, which changes its crystal structures. The result is a minimal geometric change, which mechanically triggers the opening of the injector needle. The use of piezo injectors makes it possible to reduce the moving mass at the injector needle from 16 to 4 grams in each case. This enables considerably smaller and more precisely metered injection quantities. At the same time, piezo technology allows a higher injector needle speed.
The number of injection processes per combustion cycles can thus be varied almost at will. The 3.0 V6 TDI engine, for example, has up to five injection processes: in addition to the main injection process, double pilot injection takes place at the lower end of the speed range and single pilot injection in the medium speed range. On top of this, single post-injection takes place up to around 2,500 rpm and at maximum part-load. This reduces emissions and ensures a smoother combustion process.
Heres even more info on the difference between PD and common rail.
http://www.automobile.com/vw-to-switch-to-common-rail-diesel-technology-from-pd-tdi.html :laugh:
I've had both and driven over 80000 in each and can confirm the new 170 is wicked.
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There are numerous internal differences. Compression Ratios, piston bowl design, injection periods, after treatments etc.
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Talking of Diseasels
have VW started selling cars with Add blue systems yet ?
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Yes
Also known as a extra tank of piddle.
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Pigs piss :grin:
just had dealings with it for a while
not sure its the greatest of ideas for cars
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it's apparently going to be the way that all engines are going. Urea dosing in the exhaust.
Depending on usage and engine size it could also require refilling after ever other tank of fuel. Happy times.
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Most HGVs have been running Euro 4/5 Emission controls for a while
Generally a 40 litre tank will last 800 litres of Diseasel i think , so every other one would be about right
the dealings ive had with it all seem to be VERY temprimental , a Cold snap in the weather makes it throw a wobbley and go into "safe mode" sittin in stanstill traffic does the same
then not to mention the purity off the Add blue itself doesnt take well to contaminates
and of course drivers love putting - Diesel/hydraulic fluid/ATF - anything but add blue in the tank