James Saunders Posted December 2, 2001 Share Posted December 2, 2001 How would you make a 1.6 Kseries Supersport pop and crackle on overun ? Just followed a TVR Cerbera and every time it slowed for a roundabout it popped and banged a treat! Would fitting a competition exhaust help ? or is the ecu that would need programming to add more fuel etc ? Cheers James 'K' All the way thumbsup.gif Well until now .... smile.gif Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted December 2, 2001 Share Posted December 2, 2001 I think you'll find that it's been mapped not to do it. It's usually caused by petrol fumes reaching your hot exhaust and going bang there. If you make your engine run rich on overrun by deliberately mismapping it, you could create the same effect. It's somthing I can create on throttle bodies by closing off all the idle bypass valves, but it probably isn't a good idea. Alex Link to comment Share on other sites More sharing options...
Fred Posted December 2, 2001 Share Posted December 2, 2001 MORE TO THE POINT WHY WAS IT IN FRONT OF YOUteeth.gif Clik The Impatient Link to comment Share on other sites More sharing options...
James Saunders Posted December 2, 2001 Author Share Posted December 2, 2001 Alex, thanks for info. Clik, 180mph v's 130mph sad.gif it was a straight piece of roadsad.gif James 'K' All the way thumbsup.gif Well until now .... smile.gif Link to comment Share on other sites More sharing options...
oilyhands Posted December 2, 2001 Share Posted December 2, 2001 Most modern management systems have a fuel shut off on overrun, this prevents unburnt hydrocarbons from popping in the exhaust. Some ECUs have this as a programmable option so that you can turn on the overrun popping and crackling, although why you would want it is a mystery. Oilysnad Link to comment Share on other sites More sharing options...
WILL FLY Posted December 2, 2001 Share Posted December 2, 2001 It's obviously a M*x P*wer thing, the guy's obviously a poser smile.gif. Mind you I do like the way my car 'burbles' on the overrun, since Rave talker mapped the Emerald. Maybe wr need a switchable map so that you could turn "Flames on Overrun" on and off teeth.gif See willfly.net for more info. If you don't spin you ain't trying smile.gif Link to comment Share on other sites More sharing options...
elie boone Posted December 2, 2001 Share Posted December 2, 2001 Jimmy, You want the exhaust to pop & crackle ? put a X flow in it. biggrin.gif Link to comment Share on other sites More sharing options...
EFA Posted December 2, 2001 Share Posted December 2, 2001 My car has this feature permanently enabled. Great fun for waking up small villages late at night by a combination of my exhaust and their car alarms which seem rather easily triggered.... Downside is fake gatso syndrome, where you get two backfires about 1/2 second apart followed by frantic seaching for the grey box in my rear view mirror. Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
WILL FLY Posted December 2, 2001 Share Posted December 2, 2001 That would just give you an oil slick, what he needs is a Blackbird engine, then he'd have flames as well biggrin.gif See willfly.net for more info. If you don't spin you ain't trying smile.gif Link to comment Share on other sites More sharing options...
Swiss_Tony Posted December 2, 2001 Share Posted December 2, 2001 An air leak at the header pipes to collector helps the pops and bangs! Link to comment Share on other sites More sharing options...
Gabbleratchet Posted December 2, 2001 Share Posted December 2, 2001 Mine does it anyway...even with standard 1.6 K-Series and MEMS. Link to comment Share on other sites More sharing options...
mav Posted December 2, 2001 Share Posted December 2, 2001 Mine too(1.6 SS) teeth.gifthumbsup.gif Link to comment Share on other sites More sharing options...
James Saunders Posted December 2, 2001 Author Share Posted December 2, 2001 My motorbike does it and I spend my time going through villages accelerating a bit to 5000rpm and lifting off as I pass old ladies teeth.gif.. I just thought it would be nice on the Seven too as I remember once being in an R500 that popped on lift off and gear changes .. basically any time the clutch was pressed or lifting off the throttle created a bundle of pops, burbles, crackles, bangs cool.gif cool.gif cool.gif James 'K' All the way thumbsup.gif Well until now .... smile.gif Link to comment Share on other sites More sharing options...
sjwb Posted December 2, 2001 Share Posted December 2, 2001 Jimmy Maybe you should read the Caterham handbook. Ze poppun unt bangen equals dead catalytic converters that's why there are over-run controls in the ECM. Having said that the air leak theory is the one to go for, just slip-joint your muffler to downpipe junction - as I am sure your motorcyle is. Steve B Link to comment Share on other sites More sharing options...
AndreK Posted December 2, 2001 Share Posted December 2, 2001 Get a real Caterham...with webers!!! (Ducks for cover) Link to comment Share on other sites More sharing options...
Gridgway Posted December 2, 2001 Share Posted December 2, 2001 when I went to Bedford Autdrome last week, there was a sierra cossie turbo, the original kind, hatchback with huge whale tail. every time it changed gear a huge sheet of flame shot out the side exit exhaust! That was ok until I was going by on the straight and yep, you guessed it, gear change! That was a scary moment! No damage tho. Link to comment Share on other sites More sharing options...
colin carthy Posted December 2, 2001 Share Posted December 2, 2001 get a x-flow & carbs for those flames, crackle & pop Link to comment Share on other sites More sharing options...
captain chaos Posted December 2, 2001 Share Posted December 2, 2001 I'm with you AndyK. To me Carbs are the essence of the vehicle. A couple of times this past year I've nearly gone over to TB's but why 'chase the brake' when, with carbs, sometimes you can effect mods on the move, it's mechanicalthumbsup.gif (the more electrics I get the more nervous I become) and IMHO the induction sounds better. REAL cars have Ca..rb...s (sorry, I coughed and spluttered a bit there!)biggrin.gif Link to comment Share on other sites More sharing options...
EFA Posted December 2, 2001 Share Posted December 2, 2001 Gary, Get your ears syringed. TB's sound every bit as good as carbs, but louder. Thats why we all get noice problems. Its single plenum injection which sounds boring.... Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted December 2, 2001 Share Posted December 2, 2001 CC, Your car would be quicker with TB's. Alex (now counting how long it takes you to go for the conversion smile.gif Link to comment Share on other sites More sharing options...
captain chaos Posted December 2, 2001 Share Posted December 2, 2001 Alex, So everyone keeps telling me...but the pleasure will be even greater when I manage to keep up with you next year! Arnie, I must admit Alex's car does sound louder than mine but it's quality old chap not quantity! Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted December 2, 2001 Share Posted December 2, 2001 CC, So everyone keeps telling me...but the pleasure will be even greater when I manage to keep up with you next year! You'll run out of petrol before you get close with those thirsty carbs of yours! Alex Link to comment Share on other sites More sharing options...
CHRIS CLARK Posted December 2, 2001 Share Posted December 2, 2001 Alex. My 'real' initials are CC !! Have to say that D2H TB's can be a lot louder than carbs. I saw a good friend today who has a 1600 x/flow Sprint.Haven't seen him or the car for a while now. As usually happens though, we drifted into the garage and he pulled the car out, fired it up and got it good 'n' warm. When I was running my 'K' in std. 1400 SS form his car used to seem so noisy on the induction etc. I now can hardly hear it. My whole perception has changed (or maybe my hearing)!!! Chris Clark Link to comment Share on other sites More sharing options...
captain chaos Posted December 2, 2001 Share Posted December 2, 2001 Alex, When I first got the car from Hefin it used to do about 120 miles per tank!!! Since the fitting of 3D it now gives about 160. How do you get on? Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted December 2, 2001 Share Posted December 2, 2001 Road use - 200 miles per tank Track use - about 4 laps of the ring! Alex Link to comment Share on other sites More sharing options...
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