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| Why is exhaust popping good? (apart from the obvious!) | ||
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Moderators: Dave, cooper_sport, Neil the Hat, BlackFerret, Matt
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| Author | Post | ||
| Matty |
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  Registered Member #368 Joined: Tue Mar 13 2007, 12:00AMLocation: Bournemouth Posts: 15 | Hi people Was chatting to some people at work the other day who had heard my mini popping and burbling. I explained to them that some cars do this and that it is generally associated with more tuned cars but it got me thinking: I know that it is caused by fuel being dumped into the exhaust and this helps eliminate lagging in turbo cars due to the explosion helping prolong the spinning of the turbo. I have heard that BMW designed this into the Cooper S especially and that some pop more than others. Apart from making the Mini sound meaner, what is the purpose of this in a non-turbo car? Does it aid performance in anyway?  | ||
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| EDM |
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  Registered Member #623 Joined: Mon Sep 08 2008, 06:19PMLocation: bournemouth Posts: 81 | not true, you dont have to have a turbo car for that! the popping sound is due to the "too" rich mixture. it means you are dumping to much fuel, and the car needs to be leaned out a little bit! Image: http:// img.photobucket.com/ albums/v217/ hatallas/Euro2.jpg 08 chili red cooper / 08 mazdaspeed 3 / 06 mazda 3 ( fully built 400WHP) / 97 GTI VR6 ( full neuspeed) | ||
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| Dave |
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Mini Turbo'd   Registered Member #140 Joined: Mon Mar 13 2006, 12:00AMLocation: Southampton Posts: 2481 | It was introduced on facelift MINIs. I think they might have been using it to cool cylinder temps a bit as a tiny bit of fuel makes a huge difference. But you can make it pop on closed loop fuelling so must be injecting fuel on lift off. MINI Project 370hp and counting... : MINIProject.co.uk | ||
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| EDM |
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| Registered Member #623 Joined: Mon Sep 08 2008, 06:19PMLocation: bournemouth Posts: 81 | but it does sound cool, thats my turbo 3 when we were tuning it: Image: http://i206.photobucket.com/albums/bb190/Sokool101/th_100_3145.jpg Image: http://i206.photobucket.com/albums/bb190/Sokool101/th_100_3143.jpg when i was runing out of the basic tune the car would sound like an MP5 when i would let off at highway speeds lol! Image: http:// img.photobucket.com/ albums/v217/ hatallas/Euro2.jpg 08 chili red cooper / 08 mazdaspeed 3 / 06 mazda 3 ( fully built 400WHP) / 97 GTI VR6 ( full neuspeed) | ||
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| cooper_sport |
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and my flaming MINI  Registered Member #7 Joined: Mon Oct 03 2005, 11:00PMLocation: Bournemouth Posts: 814 | On facelift MINI's they added the popping to make it sound a bit like a classic tuned mini, and as dave said it will also help with the cylinder temps. If you want to hear a MINI with too much popping you sould hear my MINI. Now I'm running GTT manifold and decat the pops are very noisy.  | ||
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| Matty |
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| Registered Member #368 Joined: Tue Mar 13 2007, 12:00AMLocation: Bournemouth Posts: 15 | cooper_sport wrote ... On facelift MINI's they added the popping to make it sound a bit like a classic tuned mini, and as dave said it will also help with the cylinder temps. If you want to hear a MINI with too much popping you sould hear my MINI. Now I'm running GTT manifold and decat the pops are very noisy. Yeah i've heard yours go past a few times in Bournemouth recently. Thought it sounded different both on and off the gas and wondered if you had had a new manifold fitted. Mine for some reason has always popped and banged alot, like yours. But now yours possitively crackles!. Sounds great  | ||
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| Max |
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Founder Member Registered Member #23 Joined: Sun Jan 15 2006, 12:00AMLocation: On a Canal Somewhere  Posts: 1060 | Posers all of you  You can only get true burbling with 265bhp and no cat. Eat yr hearts out suckers   Support Our Heros http://www.helpforheroes.org.uk/ http://www.presentsformen.co.uk/product-PFM-Help-for-Heroes-Mug-6461/ http://www.thesun.co.uk/sol/homepage/news/article492159.ece http://www.artfund.org/queenandcountry/index.php http://www.santalash.co.uk/charity.html | ||
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| Dave |
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| Mini Turbo'd Registered Member #140 Joined: Mon Mar 13 2006, 12:00AMLocation: Southampton Posts: 2481 | Sounds like we need a cheap local Rolling Road Day  MINI Project 370hp and counting... : MINIProject.co.uk | ||
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| Tracie |
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aka: Lola Registered Member #12 Joined: Sat Jan 14 2006, 12:00AMLocation: Poole, Dorset Posts: 872 | Surrey is the place to go For reliable figures Image: http://
i257.photobucket.com
/albums/hh240/
tracie1111/
IMG_1046_1-1.jpg The De-Tango Queen..I am fully prepared to admit that I am Never wrong | ||
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| Dave |
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| Mini Turbo'd Registered Member #140 Joined: Mon Mar 13 2006, 12:00AMLocation: Southampton Posts: 2481 | yeah mine comes out the same time no matter what mods I have lol MINI Project 370hp and counting... : MINIProject.co.uk | ||
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| Max |
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| Founder Member Registered Member #23 Joined: Sun Jan 15 2006, 12:00AMLocation: On a Canal Somewhere Posts: 1060 | Tracie wrote ... Surrey is the place to go For reliable figures Main thing is to do a number of cars on the same day to get comparison print outs - most of them are not THAT accurate. The last two I had done on the MINI they failed to take my car to the rev limit (7,500rpm) cause they think the limit is same as others (5,500)  I took my Porsche to Ray West Tuning (Thruxton) last year for a Rolling Road Remap  his rollers are quite accurate. Was an expensive outing but the Porsche drives really well as a result.Max Support Our Heros http://www.helpforheroes.org.uk/ http://www.presentsformen.co.uk/product-PFM-Help-for-Heroes-Mug-6461/ http://www.thesun.co.uk/sol/homepage/news/article492159.ece http://www.artfund.org/queenandcountry/index.php http://www.santalash.co.uk/charity.html | ||
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| Dave |
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| Mini Turbo'd Registered Member #140 Joined: Mon Mar 13 2006, 12:00AMLocation: Southampton Posts: 2481 | dodgy operator maybe?? they should be taking it to the rev limiter which is between 6,750 and 7250 depending on what version of the MCS people have. Better to just compare torque and hp to someone else at a few set points on the graph. Peak is just that.... the peak MINI Project 370hp and counting... : MINIProject.co.uk | ||
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| Max |
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| Founder Member Registered Member #23 Joined: Sun Jan 15 2006, 12:00AMLocation: On a Canal Somewhere Posts: 1060 | Tracie wrote ... Surrey is the place to go For reliable figures Details please Tracie? Ta M Hugs Support Our Heros http://www.helpforheroes.org.uk/ http://www.presentsformen.co.uk/product-PFM-Help-for-Heroes-Mug-6461/ http://www.thesun.co.uk/sol/homepage/news/article492159.ece http://www.artfund.org/queenandcountry/index.php http://www.santalash.co.uk/charity.html | ||
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| Dave |
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| Mini Turbo'd Registered Member #140 Joined: Mon Mar 13 2006, 12:00AMLocation: Southampton Posts: 2481 | http://www.surreyrollingroad.co.uk/ Thats the place I always go to Max Charlie is a good guy MINI Project 370hp and counting... : MINIProject.co.uk | ||
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| Tracie |
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| aka: Lola Registered Member #12 Joined: Sat Jan 14 2006, 12:00AMLocation: Poole, Dorset Posts: 872 | Charlie is the Master LOL I don't know how he does it, but he knows who has done your mapping etc and will evan know if it can take more depending on your turbo ( that applies to us Scoobie owners ).He's very well respected amongst the more powerful performance car owners, he readings are spot on accurate and I wouldn't take a car anywhere else to be honest He's the only person I've seen do a dyno run who has his eyes shut in concentration listening to the engine. My S will be going there when its nicley run in with a few added mods Image: http://
i257.photobucket.com
/albums/hh240/
tracie1111/
IMG_1046_1-1.jpg The De-Tango Queen..I am fully prepared to admit that I am Never wrong | ||
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| Bhozar |
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 Registered Member #327 Joined: Wed Jan 10 2007, 12:00AMPosts: 81 | Dave wrote ... It was introduced on facelift MINIs. I think they might have been using it to cool cylinder temps a bit as a tiny bit of fuel makes a huge difference. But you can make it pop on closed loop fuelling so must be injecting fuel on lift off. Odd. My Feb 03 car always popped, evne when standard. Doesnt any more since bigger injectors and AFPR though. Well, it does, but not so often and its usually on track. | ||
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