still have a bad reputation or has the technology improved! (versus vvti) I have vvti now, but looking at buying another car with the choice of staying with vvti or going to a D4. Also your opinion on a D4 vvti engine! I thought it would be one or the other.! Cheers!
kimbo88,
Jan 27, 6:09pm
The newer D4's are fine provided that you run them on the higher octane fuel that they are designed to be run on and don't muck around feeding them with 91.(I'm assuming you are talking about the petrol versions here, but what specific model are you looking at!)If the petrol ones, make sure the minimum used is 95 or preferably 98, and they have to be driven a bit hard from time to time on the open road otherwise they can tend to gunge up a bit.Good engines with good power output and reasonable economy.
stealthbida,
Jan 27, 6:24pm
Yes the petrol ones, the wife wants a 3 door Rav (2000-20004ish), and what about these D4VVTI engines!
kimbo88,
Jan 27, 7:11pm
I've got one in the 2.5 litre 6 cylinder (the 1JZFSE engine) in a Toyota Mark 2 and I've found it to be excellent, with no problems whatsoever.But I operate it as above, the higher octane fuel and I make sure I give it a reasonable workout from time to time.With the RAV4's, when they changed from the older 3SFE engine to the newer 1AZFSE in early 2000, there was a lift in power of around 20 HP (approx. 15% increase) together with an improvement in economy.But yes, some of these engines did suffer from various problems (they have been discussed on here before so you may find it with the search funtion perhaps) but also a lot of the problems were attributable to the using of the lower octane fuel combined with a lot of "round town" type running, which didn't do them any good at all.I think that some of those earlier ones from memory did have some problems with the airflow meters, and I think that was referred to in some of the older threads on them.If you get a good one and treat it well, generally they are a very good option.
timmo1,
Jan 28, 4:30am
D4 (Direct injection of fuel into the combustion chamber) and VVTi (Variable Valve Timing Intelligence = when and how much fuel/air is allowed into the cylinder) are technologies that do things to different engine functions so yes, they can be combined in one engine :)
vtecintegra,
Nov 11, 4:52am
All manufacturers are now moving towards direct injection. How well if goes in the long run remains to be seen.
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