billmc en-US Tue, 29 May 2012 09:56:46 +0000 http://bbpress.org/?v=1.0.2 q http://singletrackworld.com/forum/search.php http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2588583 Fri, 20 May 2011 17:30:02 +0000 coffeeking 2588583@http://singletrackworld.com/forum/ <p><blockquote>What make of car is VAG???<br /> Why not just say VW or Passat, as that's what it is? Or does it make it better by association with an Audi?</blockquote></p> <p>Awesome, inverse snobbery <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_biggrin.gif" title=":D" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2588510 Fri, 20 May 2011 17:02:29 +0000 bigyinn 2588510@http://singletrackworld.com/forum/ <p>At least someone appreciated it!!! </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587465 Fri, 20 May 2011 12:20:19 +0000 Wozza 2587465@http://singletrackworld.com/forum/ <p><blockquote>Actually THIS thread is about BMW's, NOT VAJ's. </blockquote></p> <p>I can start a thread about Vaj, I'm away for the weekend so the 3 day ban is worth the laugh. <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587370 Fri, 20 May 2011 11:55:52 +0000 molgrips 2587370@http://singletrackworld.com/forum/ <p><blockquote>Yes, I know what it means, but YOU have a VW Passat, so why try and hide the fact.</blockquote></p> <p>If I was trying to hide it I'd lie about it on here and you'd never know <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587348 Fri, 20 May 2011 11:50:03 +0000 bigyinn 2587348@http://singletrackworld.com/forum/ <p>Yes, I know what it means, but YOU have a VW Passat, so why try and hide the fact.<br /> Actually THIS thread is about BMW's, NOT VAJ's. <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_wink.gif" title=":wink:" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587254 Fri, 20 May 2011 11:33:29 +0000 molgrips 2587254@http://singletrackworld.com/forum/ <p>VAG is easier to type than "VW/Audi/Skoda/Seat" and they all have the same engines which is what this thread is about <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587235 Fri, 20 May 2011 11:30:32 +0000 bigyinn 2587235@http://singletrackworld.com/forum/ <p>What make of car is VAG??? <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_rolleyes.gif" title=":roll:" class="bb_smilies" alt=""/> <br /> Why not just say VW or Passat, as that's what it is? Or does it make it better by association with an Audi? </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587190 Fri, 20 May 2011 11:21:36 +0000 molgrips 2587190@http://singletrackworld.com/forum/ <p>My diesel doesn't have a DPF, and I do sometimes (but not always) see a puff on acceleration at night. But of course I am not always looking and I also don't have a good view of the exhaust from the driver's seat <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> Certainly can't see anything in the rear view in the daytime. </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587145 Fri, 20 May 2011 11:11:05 +0000 5lab 2587145@http://singletrackworld.com/forum/ <p>the reason your diesels don't smoke is because they have a dpf to reduce the smoke. If you whipped that out, you'd see a puff on accelleration like anything else.</p> <p>My 180,000 mile mondeo is great for leaving a smokescreen. someone a bit too close behind on the motorway? 3rd gear, boot it. Car doesn't actually go any faster (it had all of 88bhp when new. I doubt its got 50 now) but it annoys the guy on your bumper </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587041 Fri, 20 May 2011 10:45:14 +0000 molgrips 2587041@http://singletrackworld.com/forum/ <p>Interesting, you could wee in the tank if you find yourself without <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587011 Fri, 20 May 2011 10:35:26 +0000 glenh 2587011@http://singletrackworld.com/forum/ <p><blockquote>speed12 - Member<br /> Haha, no worries, I'm a diesel calibration engineer by trade so it's te sort of thing I could talk about for hours!</p> <p>SCR systems are reasonably simple really - it's just like a normal catalyst but needs urea sprayed on it to convert the NOx to NO2. </blockquote></p> <p>How do you fill that SCR system up then? <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_wink.gif" title=":wink:" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2587000 Fri, 20 May 2011 10:34:11 +0000 hels 2587000@http://singletrackworld.com/forum/ <p>I opened this thread with some trepidation, but find I am bored, not disgusted.</p> <p>Swirl Flaps, have to like that - are they connected to the Flanges ?? </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586981 Fri, 20 May 2011 10:28:43 +0000 molgrips 2586981@http://singletrackworld.com/forum/ <p>My VAG doesn't smoke either.</p> <p>Sometimes you get a puff from certain cars, this I suspect is a bit of over-fuelling to spool the turbo up as fast as possible. Most produce a very fine blue haze when you floor it which you can't see at all unless it's night and someone's behind you with foglights low down.</p> <p>Hondas are supposed to be pretty clean tho. </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586937 Fri, 20 May 2011 10:20:02 +0000 samuri 2586937@http://singletrackworld.com/forum/ <p>ok, ta.</p> <p><em>And VAG engines do not smoke any more than any other diesel!</em></p> <p>Nah, not all diesels produce smoke. Once my Honda is warm I can cane it with no obvious smoke at all. </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586922 Fri, 20 May 2011 10:16:42 +0000 steve_b77 2586922@http://singletrackworld.com/forum/ <p>Police officer - Can you tell me why you were thrashing the nuts off your land barge sir?</p> <p>Diesel Car Driver - Italian Tune Up.</p> <p>Police Officer - Oh thats fine, nice flaps BTW <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_biggrin.gif" title=":D" class="bb_smilies" alt=""/> </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586860 Fri, 20 May 2011 10:00:39 +0000 molgrips 2586860@http://singletrackworld.com/forum/ <p><blockquote>When I drive that car it produces masses of black soot</blockquote></p> <p>When you granny it, soot deposits build up in the engine. When you thrash it, the deposits get burned up and blown out of the exhaust, which is the smoke you see. It shouldn't do it all the time. And VAG engines do not smoke any more than any other diesel! Take it on a long fast trip and you should be fine at the end. If it's really bad you might have to clean some stuff like the EGR valve out manually, or some sensors might be clogged up so they might need a clean too - but I dunno. </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586833 Fri, 20 May 2011 09:53:27 +0000 samuri 2586833@http://singletrackworld.com/forum/ <p>Oh, and swirl flaps. I like it. </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586830 Fri, 20 May 2011 09:52:54 +0000 samuri 2586830@http://singletrackworld.com/forum/ <p><em>I would say that keeping it clean and tidy inside by a periodic thrashing would help prevent that happening.. but perhaps not fix it. </em></p> <p>Hmm. My wife has an Audi TDi and she drives like an old lady. She *never* floors it. When I drive that car it produces masses of black soot. Now I know this is normal for VAG engines but is there actually a sound basis behind ragging it every once in a while. I know knowitall blokes down the pub will say this but what about smart people? </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586802 Fri, 20 May 2011 09:45:54 +0000 molgrips 2586802@http://singletrackworld.com/forum/ <p>I did notice that their driv-e or whatever it is eco range looks particularly good (geddit? See what I did there? Particle.. oh well <img src="http://singletrackworld.com/forum/my-plugins/bbcode-buttons/default/icon_smile.gif" title=":)" class="bb_smilies" alt=""/> ).</p> <p>Seems to me that most of the wastage in diesels is compressing air that you don't need. So it would make sense to have a small displacement and bigger turbo as seems popular at the moment, so when cruising you can turn off boost and compress less air.</p> <p>Is anyone working on small 6 or 8 cylinder diesel engines where you can turn off one side by leaving the valves open, like they do on big US petrol pickup engines? Cos I always thought that would be a good idea to reduce wasted compressed air... </p> http://singletrackworld.com/forum/topic/whats-a-swirl-flap/page/2#post-2586332 Fri, 20 May 2011 00:25:07 +0000 speed12 2586332@http://singletrackworld.com/forum/ <p>Haha, no worries, I'm a diesel calibration engineer by trade so it's te sort of thing I could talk about for hours! </p> <p>SCR systems are reasonably simple really - it's just like a normal catalyst but needs urea sprayed on it to convert the NOx to NO2. It's a good technology and will actually mean a lot less reliance on EGR valves as they are so effective - which in turn will mean better mpg (CO2) and lower PM. Downside is the control system is quite expensive at the moment but the SCR cat itself is quite cheap as it's a non-precious metal cat (uses Iron or Copper rather than Platinum or Rhodium). </p> <p>Boost won't affect swirl very much as that is just a function of intake port/cylinder bowl geometry. Combustion wise though, a higher boost simply means more air in the cylinder for a given intake stroke which in a diesel is exactly what you need. It's one of the key parameters we play with to decrease fuel consumption. It has to be calibrated carefully though as higher boost will draw through more EGR and so you could actually end up with higher CO2 and more PM by raising boost. But overall higher is better!</p> <p>Not too sure about older Volvos, but having just finished the calibration work for the latest C30, S40, V50, V60, S60, S80 and V70 I can tell you they certainly don't now! The cals on those cars are very low PM and with CO2 down to 99-119g/km (very low) and with good NOx as well. It took a bloody lot of work to get there mind! </p>