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How does the DPF operate on the 451? Sure I read somewhere that the engine will rev up when stationary? My car today has been ticking over at approx 1100rpm whilst stationary in traffic.
Generally there is a pressure sensor pre-DPF that measures how blocked the DPF is. When the pressure rises it runs the car rich to increase exhaust temperatures allowing the DPF to heat up and regenerate. There is a chance that on idle the revs may be increased as not enough heat would be produced.
Yes my mate I had the cycle removed, then we removed the DPF.... Very common google it, most tuners can do it on most makes, it will give a lot better power and vastly improve the mpg as well, it's a no brainer.
I asked s2smart about it some time back, but they did not do it, it's strange as the 54 has been out for a while, and it's all they do now.
I will ask again, if not I will talk to a really good vag coder I know of, because I want it off this cdi.
During the regeneration cycle there are a couple of things I have noted - the tick-over rises to around 1,100 rpm as you suggest, but also you can't change up the gears at very low revs (say, just under 2,000rpm); it needs a few more revs than the usual minimum before it will go up a gear.
I think smart are actually starting to get their act together on the DPF - I had to have an exhaust temperature sensor replaced a couple of weeks ago (due to the engine management light coming on), but since then the car has been significantly better (I've done 2,000 miles in my first month of ownership, so do drive it quite a bit!) and the regeneration cycle can happily continue over several journeys / overnight if it starts during a short trip.
I also like the idea of removing it, but am going to wait and see what happens as I continue to add miles and the engine loosens up further (it only had 1,263 miles on the clock when I picked mine up).
During the regeneration cycle there are a couple of things I have noted - the tick-over rises to around 1,100 rpm as you suggest, but also you can't change up the gears at very low revs (say, just under 2,000rpm); it needs a few more revs than the usual minimum before it will go up a gear.
I think smart are actually starting to get their act together on the DPF - I had to have an exhaust temperature sensor replaced a couple of weeks ago (due to the engine management light coming on), but since then the car has been significantly better (I've done 2,000 miles in my first month of ownership, so do drive it quite a bit!) and the regeneration cycle can happily continue over several journeys / overnight if it starts during a short trip.
I also like the idea of removing it, but am going to wait and see what happens as I continue to add miles and the engine loosens up further (it only had 1,263 miles on the clock when I picked mine up).
Have to say I love the car though :-)
Many thanks Ian. I had a good drive on Friday evening and it appeared to have been doing a regeneration as I got home (idling at 1100 rpm) so I drove it a bit more to hopefully finish the regeneration off fingers crossed!
Have taken a bit of pee taking by family as I downgraded from a 2.2 cdti Honda civic to this 'go cart' but I am loving every minute of it so far!! I cannot remember a car that has made me smile as much as this little thing does!
It's a silly thing to fit a particulate filter onto a small engined 'city car' like the 451 cdi but it keeps the emissions police happy!
It's a silly thing to fit a particulate filter onto a small engined 'city car' like the 451 cdi but it keeps the emissions police happy!
its the guys in the EU that require the fitment of DPF's to cars... be thankfull that you dont live in germany, they HAD to retro fit DPF's to cars build after 2003 in order to drive in big cities. i recall a training instructor down at jaguar saying that they could get the emissions down without the use of the EGR valve(s) but the EU stated that the engine HAS to have them fitted in order for the enging to go in to production
we contacted s2smarts/tune4perf about our cdi, they could not do it, the dpf model had been out about a year, so i was surprised.
We removed the filter and de-cat ourself, then I replaced the exhaust. I then found a guy to map it, (he included dpf cycle removal and EGR delete in the software, and does not charge extra) £150 for the remap, if you need his details tell me.
Its a lot smother at low revs and I think that the EGR software removal, plus no cat and dpf.
MPG is a lot better, I took the car to an independent rolling road, before and after it hit 53bhp before and 72 after, but the torque is ace.
That sounds like it's only a matter of time then before my DPF goes... I'd be interested to understand the before and after emissions number as come MOT time (eventually) that will matter.
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