popping & banging

P

playalistic

Senior member
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With my stock exhaust never really noticed any popping and banging in the M, until today when I had sport mode on during some "spirited driving". I assume that with sport on the M will still be fuelling on a trailing throttle is this correct???

Reason I toyed with sport mode today is with heel & toeing. I cannot heel toe reliably (re 10/10, more like 8/10) thanks to my relatively small feet and the M's pedal setup. Anyone else think the M's pedals aren't exactly ideally spaced for heel & toe? :headbang: Anyone use a specific technique? Obviously sport mode means the throttle jab can be much less pronounced.
 
mine used to as well especially when i really worked it and the pipes got hot.... but it was a very muffled type of pop, now i get four stabs of blue flames when i change @7900, confirmed by my friend recording a few runs with his m3.

get those pipes really hot and it will get generally louder also.

i not to sure re the fueling.... i believe all sport mode is throttle postion changes vs pedal position.
 
Beedub - you're right. All sport mode does (related to the throttle and fuellling) is increases the sensitivity of the pedal. In effect decreasing the movement required from closed to WOT.
 
Playalistic, I noticed this too. There is a definite and reproducible difference when driving the car in the same fashion with sport mode engaged vs not. It is possible to get a few pops and bangs with sport mode off, but you really have to try hard. With sport mode engaged, it will readily pop and crack with every snap closure of the throttle once the exhaust system is hot.
 
playalistic said:
What I thought too, so why does it only occur with sport mode?
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I would assume it's because in effect you are opening closing the throttle a lot quicker with similar foot movements and probably causing a bit more fuel to be unburnt. You'll also likley be driving it harder in sport mode as that's why you pressed the button.
 
Mine pops and bangs a bit when driving hard, next time i am giving it the beans i will stick it in sports mode and see if i can hear a difference,
 
I always drive mine in sport unless I'm in town, can't say I've noticed any change in the exhaust but I always use it for the ease of blipping on down shifts as it's considerably more responsive. I don't have any probs with the pedals but I guess my size 11s help...one thing I do love with the exhaust is that changes tone once warmed up, lots more bass!
 
cj10jeeper said:
playalistic said:
What I thought too, so why does it only occur with sport mode?
Click to expand...

I would assume it's because in effect you are opening closing the throttle a lot quicker with similar foot movements and probably causing a bit more fuel to be unburnt. You'll also likley be driving it harder in sport mode as that's why you pressed the button.
Click to expand...
That makes sense, although I don't drive any harder in sport mode since I've had the M. In fact, I'm pretty certain yesterday was the first time I've ever used sport mode in the M. I find the throttle more than sensitive enough, and it doesn't weight-up the steering like it did in my old 3.0 zed so I don't really see the point other than it does assist with heel toeing somewhat.

I guess with the heel toeing I just need to keep at it, I tend to only heel toe when i'm pressing on and not during normal driving. I'll try it for all downshifts and see if I can get some rhythm. If that doesn't work, I'm going to start marketing these bad boys for those of us who are "challenged" in the foot department:

whimsical%20walker%20clown%20shoes_1.jpg


Obviously the M logo'd ones are going to be considerably more expensive :D
 
The Sport button DOES make a difference with the pops burbles and bangs and you dont need to be at it to notice. I've also noticed this even before switching to the RPI's which make the differences even clearer.

As for heel-toeing, i dont actually use the heel to press the gas pedal, i need to twist it a bit too hard to manage that and it doesnt feel comfortable. Instead i press the brake pedal with the left part of the ball of my foot and then blip the gas pedal with the right side of the foot, not the heel. I also find that i can consistently rev-match better with the Sport button ON.

An example of the technique that i use:

[youtube]WCePH2xu4_4[/youtube]
 
Cheers, the first method he showed is exactly what I do. The second method is something I have toyed with, but as you said you do seem to need sport enabled to match easily. I'm going to stick with the second method for now and see what gives :thumbsup:
 
Re, heel and toeing.
The pedals are the prefect distance for h & t for me with my size tens. I find you really need to drive that way to be smooth, because the revs rise and fall quickly. I do it now without even thinking about it and still enjoy the noise. 8)
:D
 
Wanted to add that it's much easier for me to heel-toe if i'm braking quite hard. And easier still once the brakes have some heat in them but not gone very soft.
 
toplad said:
Re, heel and toeing.
The pedals are the prefect distance for h & t for me with my size tens. I find you really need to drive that way to be smooth, because the revs rise and fall quickly. I do it now without even thinking about it and still enjoy the noise. 8)
:D
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Do you twist your foot round and jab with your heel or have it positioned over brake and gas and roll it sideways?
 
agree it's easier with harder braking - sometimes just a squeeze of ur little toes overlapped on the throttle is good enough to balance it nicely. mines more of a roll. :driving:
 
playalistic said:
toplad said:
Re, heel and toeing.
The pedals are the prefect distance for h & t for me with my size tens. I find you really need to drive that way to be smooth, because the revs rise and fall quickly. I do it now without even thinking about it and still enjoy the noise. 8)
:D
Click to expand...

Do you twist your foot round and jab with your heel or have it positioned over brake and gas and roll it sideways?
Click to expand...
The latter, just like in the vid.
 
Definitely not something to rush into, I've been scouring the net for an old article I found helpful and will post it if I find it...basically it tells you to focus on getting the rev matching part right across various gear changes in a straight line before even thinking about trying it when braking. A good idea to break it down into steps and it makes driving in even fairly slow traffic more entertaining ;)
 
tjlazer said:
Definitely not something to rush into, I've been scouring the net for an old article I found helpful and will post it if I find it...basically it tells you to focus on getting the rev matching part right across various gear changes in a straight line before even thinking about trying it when braking. A good idea to break it down into steps and it makes driving in even fairly slow traffic more entertaining ;)
Click to expand...
It's not that I can't do it as I've been doing it for years with other cars. Just that the pedal spacing meant I had trouble twisting round the usual way. Would be easier if they were the same height. Rolling to the right is the only way I can do it reliably it seems. I don't find matching the revs difficult.


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