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 Posted: Mon Nov 17, 2014 5:18 am |
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Joined: Jan 05, 2011
Posts: 198
Trade Rating: +3
Location: Bristol
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That's true, but driving around with a clogged DPF or an EGR that is jammed open will be 10x worse for the environment. Once these systems go wrong they do more harm than they did good for the short period of time they were functioning correctly, have you ever seen a car running with the EGR stuck open?
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Posted: Mon Nov 17, 2014 6:21 am |
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Joined: Oct 05, 2012
Posts: 367
Trade Rating: 0
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so it's okay to design a system that lasts 80k and then charge the customer an absolute fortune for regenning or replacing completely?
I work for a chemical manufacturer where we actually produce Nox so the amount i'm emitting really doesn't bother me.
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Posted: Mon Nov 17, 2014 7:38 am |
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Joined: Dec 17, 2010
Posts: 144
Trade Rating: +1
Location: Wiltshire
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| 206HdiGti wrote: |
so it's okay to design a system that lasts 80k and then charge the customer an absolute fortune for regenning or replacing completely?
I work for a chemical manufacturer where we actually produce Nox so the amount i'm emitting really doesn't bother me. |
the EGR tends to increase the NOx levels, with the DPF capturing these.
If you're going to do one, do both. EGRs, despite popular 'intrnetz' myth, do not save your turbo, breed unicorns, or add any performance enhancement other than to reduce human-harming emissions.
Newer vehicles pretty much have them forced on for the life of the vehicle, and there's the potential for MOT tests to have checks other than visual and smoke to identify if they are working correctly.
I'm not aware of any HGV or plant vehicles with DPFs, so it's an odd tactic to focus on the passenger car, but I believe the target cause, demanded by EU and so on, is to reduce urban pollutants - so sat in traffic & slow speeds in citys.
EGR valves don't operate under anything other than very little/no throttle anyway, adding further to the 'City driving' thing.
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| Iceland Blue '99 206 GTI (140) - SOLD
KMF '05 1.4 HDi | |
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Posted: Mon Nov 17, 2014 8:13 am |
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Joined: Oct 05, 2012
Posts: 367
Trade Rating: 0
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I haven't done anything with my EGR.
I have bigger issues now rather than worrying about emissions!
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Posted: Mon Nov 17, 2014 9:10 am |
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Joined: Jan 05, 2011
Posts: 198
Trade Rating: +3
Location: Bristol
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That's not right, EGR reduces NOx by reducing combustion temperatures. It does this by adding exhaust gasses which effectively act as an inert gas and reduce both cylinder temperatures and pressures, EGR only operates at low load, you'll notice slightly better pick up with off it but no increase in top end power. I remove EGRs to prevent them from going wrong in future because it's 90% certain that the solenoid will break and cause problems (at some point).
DPF does not catch any NOx, NOx is a gas, it only catches small particles of soot. Most of the diesels run very clean nowadays so we don't really need them over here, try driving along the roads in Vietnam and you'll be choked by thick black smoke.
The problem with DPF is that you need to drive the car long distances to heat up the filter enough to burn off the soot, most people don't do this and it clogs up.
Another problem with the DPF and cat system is the amount of residual heat it stores. If the filter is regenerating whilst you're cruising at motorway speeds you could be running it as hot as 1000C. When you switch off your engine and don't let it run a few minutes to cool down the turbo the residual heat cooks the oil left standing in the turbo. If you keep doing this you coke up the bearings and oil lines and eventually end up with turbo failure.
Take the DPF and cat out and you're much less likely to see problems with your turbo, it's a no brainer to the average consumer who doesn't have unlimited money.
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Posted: Mon Nov 17, 2014 10:39 am |
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Joined: Oct 05, 2012
Posts: 367
Trade Rating: 0
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Steve you ever had an issues with snapped glow plugs?or that not your area? sorry to hijack the thread. I'll Pm you if you've had issues with these.
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Posted: Mon Nov 17, 2014 11:03 am |
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Joined: Jan 05, 2011
Posts: 198
Trade Rating: +3
Location: Bristol
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Never been that unlucky. I generally don't touch glow plugs as the hdis don't really need them anyway. If there's no thread left on it you could try loading the engine to pop it out, obviously you'll need to devise a way of catching it so it doesn't shoot through the bonnet, could save you taking the head off....
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Posted: Mon Nov 17, 2014 12:04 pm |
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Joined: Oct 05, 2012
Posts: 367
Trade Rating: 0
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I've driven it 120 miles since it's been like it and it hasn't been sucked in or spat out yet...
It's not the metal casing that in there, it's the ceramic end which has been carboned up and stuck in the hole.
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Posted: Mon Nov 17, 2014 12:54 pm |
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Joined: Jan 05, 2011
Posts: 198
Trade Rating: +3
Location: Bristol
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You'll need to get the head off then..
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Posted: Mon Nov 17, 2014 1:08 pm |
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Joined: Nov 27, 2010
Posts: 11519
Trade Rating: +10
Location: What's it to you? ? ?
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| badj wrote: |
I'm not aware of any HGV or plant vehicles with DPFs, so it's an odd tactic to focus on the passenger car |
Certain Toyota diesel forklifts have DPF's fitted, these plug in to the mains to carry out a regen & burn the soot of the filter.
The newer diesel engines designs being fitted now have done away with the DPF all together as the engine is a lot cleaner.
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Posted: Fri Nov 21, 2014 2:33 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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pro-steve: I yes know about residual heat in DPF. My alfa diag software gives readout of DPF temp on each burn. Last burn before removal and re-map was 780 deg C.
I have seen a DPF set fire to a grass verge in the middle of summer.
I have seen a DPF ruin a painted garage floor during a forced regen. Why anyone would start a forced regen inside a garage baffles me. Not due to the heat but the smoke!
I wasn't telling the OP not to do it just making sure the decision was fully informed. As I said I have removed DPF and EGR and re-mapped every diesel that I have owned.
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