yokomo Posted April 6, 2010 Share Posted April 6, 2010 anyone else get little pops and gurgles when reving the car stationary ? please excuse the bouncing at the start i have no idea why ! car has spacer , fujitsubo legarlis R and japspeed Y Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 6, 2010 Share Posted April 6, 2010 huskies is stock and does it alot as well, more so than mine does. i get a little bit Quote Link to comment Share on other sites More sharing options...
yokomo Posted April 6, 2010 Author Share Posted April 6, 2010 hmm , any idea what causes it ? kinda like the sound of it just never hear it on the move only when im sitting there. Quote Link to comment Share on other sites More sharing options...
Caroline350Z Posted April 6, 2010 Share Posted April 6, 2010 I feel left out! Mine doesn't pop! Quote Link to comment Share on other sites More sharing options...
Ian Posted April 6, 2010 Share Posted April 6, 2010 Lots It sounds like the Blitz used to pop more but I think the GReddy is too loud to make them out Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 6, 2010 Share Posted April 6, 2010 pops are un burnt fuel being ignited burbles, not so sure about need to have a think Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 6, 2010 Share Posted April 6, 2010 Exhaust Burble on Acceleration Some cars' exhaust systems will produce an odd burble or bubbling noise. For the most part this is deliberate when it occurs in vehicles upon acceleration, but not always. Many "street racers" and similar cars have undergone a few modifications to give them better fuel efficiency at higher RPMs. In order for this to occur, the lifters and timing mechanism for the sequence of combustion in the engine's cylinders is altered. This means that, while the engine timing will work well at much higher RPM, the combustion process at lower speeds is slightly off. The burble is in actual fact a series of lean misfirings caused by this timing which rumble out through the exhaust system. It causes no serious damage to the engine, and soon disappears once the vehicle has reached high speeds. Exhaust Burble on Deceleration An exhaust burble, or throaty popping noise which could be likened to a babbling brook, is has a different cause if it only occurs when suddenly backing off on a vehicle's throttle. Essentially, the sudden easing off the throttle causes an immediate decrease in exhaust emissions to the degree that atmospheric pressure surrounding the exhaust pipe pushes cool air up into the exhaust system. This air collides with the warm exhaust gasses and creates a rumbling not unlike thunder. Normally this will only happen if the tailpipe has too wide a diameter to maintain equalized air pressure, or there is a seam in the exhaust pipes which is not air tight. Repairs Some people like having the throaty noise of an exhaust burble; some do not. For those who do not want this sound, there are ways of fixing it. For an exhaust burble on acceleration, the engine must undergo a professional tune-up including resetting the timing mechanism and lifters; keep in mind this will decrease high speed engine performance, but increase the quality of performance at low speeds. For exhaust burbles upon deceleration, the seams of the exhaust pipe must be sealed against unwanted air entry, or the pipe must be swapped out for one of a smaller diameter to maintain equalized pressure between exhaust and the surrounding atmosphere. Quote Link to comment Share on other sites More sharing options...
yokomo Posted April 6, 2010 Author Share Posted April 6, 2010 pops are un burnt fuel being ignited burbles, not so sure about need to have a think ah so running a little rich on the lift off , makes sense. always loved the sound of your single Ian , just dont think i could handle the volume. Quote Link to comment Share on other sites More sharing options...
Ian Posted April 6, 2010 Share Posted April 6, 2010 pops are un burnt fuel being ignited burbles, not so sure about need to have a think ah so running a little rich on the lift off , makes sense. always loved the sound of your single Ian , just dont think i could handle the volume. As a daily I don't think I could either Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 6, 2010 Share Posted April 6, 2010 pops are un burnt fuel being ignited burbles, not so sure about need to have a think ah so running a little rich on the lift off , makes sense. always loved the sound of your single Ian , just dont think i could handle the volume. from what i found on the goole i was wrong, full explanation above Quote Link to comment Share on other sites More sharing options...
yokomo Posted April 6, 2010 Author Share Posted April 6, 2010 yeah just read that , also seems to fit wiht my fujitsubos huge ole 4.5" pipes ! stil cant beat the backfireing of a tuned rally car though . Quote Link to comment Share on other sites More sharing options...
andlid Posted April 6, 2010 Share Posted April 6, 2010 Interesting read thatyou found there... not sure re deceleration being a problem with the seams on the exhaust... mine has that with the haltech in line and without it I don't so in my case it's more the timing/fuelling thats causing it... I LOVE it so it's staying Mine sounds a bit loud in a sharp way no rumble really... Ian yours is loud Quote Link to comment Share on other sites More sharing options...
IanS16 Posted April 6, 2010 Share Posted April 6, 2010 Pretty sure its when a car is running a little richer than stock. I think excess fuel hits the hot exhaust and explodes which is less muffled by an aftermarket exhaust, thus usually more noticeable. I live down a hill and if I put the car in second and let the cars weight pull itself down the hill without throttle it pops and bangs all the way down Personally I LOVE IT Quote Link to comment Share on other sites More sharing options...
rtbiscuit Posted April 6, 2010 Share Posted April 6, 2010 i love it to, but my zed just doesn't compare in that respect to my old roadster. that thing was awesome. am hoping the plenum and a retune may have some effect on the exhaust note. the one thing i have noticed is that the zeds cabin is surprisingly well insulated. well in the coupe it is anyway. Quote Link to comment Share on other sites More sharing options...
yokomo Posted April 6, 2010 Author Share Posted April 6, 2010 Pretty sure its when a car is running a little richer than stock. I think excess fuel hits the hot exhaust and explodes which is less muffled by an aftermarket exhaust, thus usually more noticeable. I live down a hill and if I put the car in second and let the cars weight pull itself down the hill without throttle it pops and bangs all the way down Personally I LOVE IT damn you ian dont give me ideas of roling down hils just to make noise ! havent manged to get any tasty over run noise as yet but dont really run in low gears very often , till now ! Quote Link to comment Share on other sites More sharing options...
Husky Posted April 7, 2010 Share Posted April 7, 2010 your all just jealous im sure it means my car is running rich and wasting fuel Quote Link to comment Share on other sites More sharing options...
Gervais Posted April 22, 2010 Share Posted April 22, 2010 Mine does this standard too Quote Link to comment Share on other sites More sharing options...
Husky Posted April 22, 2010 Share Posted April 22, 2010 apparently my engine is in great condition so pops and gurgles are ok Quote Link to comment Share on other sites More sharing options...
andlid Posted April 22, 2010 Share Posted April 22, 2010 apparently my engine is in great condition so pops and gurgles are ok Quote Link to comment Share on other sites More sharing options...
GT4 Zed Posted April 22, 2010 Share Posted April 22, 2010 Since installing my Utec piggy back i have more noticeable pops and bangs on overun too and just reminds me of my cerbera It just so race car like and i love it Quote Link to comment Share on other sites More sharing options...
Adriank Posted April 23, 2010 Share Posted April 23, 2010 Mine pops aswell, its loud now i have the manifolds on, feels quicker at the top of the rev range too, would be interesting to have it dyno'd again. Still isnt anything like as loud as yours Ian, but i do daily drive mine. I do have solid engine mounts now though, which adds a little something to the cabin noise! Quote Link to comment Share on other sites More sharing options...
Ian Posted April 23, 2010 Share Posted April 23, 2010 Mine pops aswell, its loud now i have the manifolds on, feels quicker at the top of the rev range too, would be interesting to have it dyno'd again. Still isnt anything like as loud as yours Ian, but i do daily drive mine. I do have solid engine mounts now though, which adds a little something to the cabin noise! Really? I thought you would be louder than me with headers My car "gained" 13hp with headers Quote Link to comment Share on other sites More sharing options...
nurrish Posted April 23, 2010 Share Posted April 23, 2010 Would be interesting to get a DB reader on both yours and mine ian..... Quote Link to comment Share on other sites More sharing options...
yokomo Posted April 23, 2010 Author Share Posted April 23, 2010 all of those planning on tracking the car this year be carefull how loud you make them ! Quote Link to comment Share on other sites More sharing options...
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