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MagicalTrevor
Original Poster
4,801 posts
98 months
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I'm sorry this has been covered before, I just don't understand the technicalities.
My K series Elise with sports exhaust pops on overrun. My old man reckons the engine needs tuning but I guess it depends on the engine?
So in laymans terms, is it ok and why?
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NWTony
1,570 posts
97 months
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I believe it's unburnt fuel getting to the exhaust and may well be a problem for your cat, if you still have one.
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MagicalTrevor
Original Poster
4,801 posts
98 months
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NWTony said: I believe it's unburnt fuel getting to the exhaust and may well be a problem for your cat, if you still have one. Thanks Tony, I'll ask the chap who looks after my car to take a look. Still sounds awesome when it pops mind 
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ewand
191 posts
83 months
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Isn't that one of the points of having the sports exhaust (depending on how much it does it/how loud it is)?
My S2 had a factory sports exhaust and used to burble and pop a bit on the overrun - sounded great!
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MagicalTrevor
Original Poster
4,801 posts
98 months
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I thought so to, my Dad insists that it needs tuning. I suspect he's just jealous 
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Moospeed
252 posts
134 months
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Gotta love a nice pop on overrun, if it's accompanied with a spot of flame even better 
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bordseye
906 posts
61 months
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popping is just unburnt fuel exploding in the exhaust rather than the engine - fuel wasted and which gives you no power. If you like the noise, you might like the old trick of turning off the engine with the car in gear and going down hill, then turning the engine on again and getting a big backfire. Probably doesnt work with fuel injection, just with carbs.
technically, your dad is right
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aelord
177 posts
94 months
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It is not a problem -it is a key feature of sport cars!
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John145
354 posts
25 months
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Modern cars dump too much fuel to cool the cats hence popping - not a problem.
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BibsTLF
678 posts
76 months
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John145 said: Modern cars dump too much fuel to cool the cats hence popping - not a problem. Erm, "Any condition that causes abnormally high levels of unburned hydrocarbons—raw or partially burnt fuel—to reach the converter will tend to significantly elevate its temperature, bringing the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction."
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jondude
1,512 posts
86 months
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John145
354 posts
25 months
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BibsTLF said: Erm,
"Any condition that causes abnormally high levels of unburned hydrocarbons—raw or partially burnt fuel—to reach the converter will tend to significantly elevate its temperature, bringing the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction." Wikipedia isn't always right.
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Hollywood Wheels
3,683 posts
99 months
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God I miss my Elise! I used to drive it through the Limehouse Link, and watch the tunnel light up as it spat flames from the exhaust. It would pop and bang every time I lifted off the accelerator. I must admit, I never actually considered whether this was 'good' for the car, as I was too busy watching the cars in front slam on their brakes as they shat themselves because of the noise. Hope this helps the OP.......
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chieflief
123 posts
49 months
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John145 said: Wikipedia isn't always right. WHAT?!?!?!?
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budgie smuggler
794 posts
28 months
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John145 said: Wikipedia isn't always right. {CITATION NEEDED}
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Captain Muppet
5,954 posts
134 months
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budgie smuggler said: John145 said: Wikipedia isn't always right. {CITATION NEEDED} Hang on, I'll just edit the wiki page and reference a book I know no one else will bother to check even exists.
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dern
12,790 posts
148 months
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It's worth checking your exhaust for holes/leaks as was mentioned earlier.
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MagicalTrevor
Original Poster
4,801 posts
98 months
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dern said: It's worth checking your exhaust for holes/leaks as was mentioned earlier. Thanks, will do. It doesn't sound like it's blowing under normal use though
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