popping and banging
Discussion
I have just fitted a new stainless steel exhaust to my '89 350i, and the car sounds fantastic. When you slow down using the gears it pops and bangs sublimely, which i love!! Also gives a little pop between upward gear changes. Now bearing in mind i love the noise, is it actually supposed to do it? Engine has been recently serviced.
If my car sounds like this, what the hell does a 450 SEAC sound like? (Probably a stupid question)
If my car sounds like this, what the hell does a 450 SEAC sound like? (Probably a stupid question)
LOUD
Yes, it's supposed to do it, but be a bit wary using the gears to slow down. Steve Heath has raised the point on here several times, but you may not have seen it. Using the gears to slow down puts a lot of wear on the drive train, and in the wet it can be quite dangerous, with the rear locking up surprisingly soon.
Just lifting the accelerator is ok, but if you find yourself using the engine as a brake, it may be worth digging out some of Steve's posts.
Sorry if this comes across as condescending or anything, and for all I know, you could be a racing driver, and know a lot better than I do. But just in case you are not aware of the strain it puts on UJs, shafts and gearbox...
Just lifting the accelerator is ok, but if you find yourself using the engine as a brake, it may be worth digging out some of Steve's posts.
Sorry if this comes across as condescending or anything, and for all I know, you could be a racing driver, and know a lot better than I do. But just in case you are not aware of the strain it puts on UJs, shafts and gearbox...
2 sheds said:
cars fitted with hotwire injection don't produce so many pops & bangs.
Tim
Ahhh. Thanks for that, a long standing wonderment between me and my mate (Ren Dao) as to why his car (a V8S) pops and bangs a lot less than mine (350i). Mind you, when his does go off, people duck.
Yep, 350s pop and bang, superb. Not quite the same with 450s; they are raspier and much louder, worth listening to.
Slowing down using the gears in conjunction with double de-clutching can control the cars speed well and is necessary if driving quickly for a prolonged period with the 350i; this is because to use the brakes only will over heat and may boil the brake fluid. The danger to which shpub refers is a sudden down change where the relative speeds of the wheels and engine are not controlled; then you will either skid or blow the engine (or both.) I hope this helps, have fun. Jonathan
Slowing down using the gears in conjunction with double de-clutching can control the cars speed well and is necessary if driving quickly for a prolonged period with the 350i; this is because to use the brakes only will over heat and may boil the brake fluid. The danger to which shpub refers is a sudden down change where the relative speeds of the wheels and engine are not controlled; then you will either skid or blow the engine (or both.) I hope this helps, have fun. Jonathan
2 boxes at the back?
what two boxes?
all mine has is a 'cherry bomb' effort in the middle....
as for engine braking - best to try this out on a track day.... discovered at bruntingthorpe that changing down 'late' into a corner (i.e. after I'd started the turn), caused the rears to lock momentarily, resulting in a lot of (eventually) controlled fishtailing.
blipping the throttle to try to match the wheel/engine revs helps (and sounds good!)
I guess the expression 'to set up for the corner' does actually mean something......
When I had the 'coached' laps with one of the pro drivers, he was merciless with the engine braking (breaking?).... and the brakes.
Question: what's the 'best' way to generate the over-run noise....
IMHO: gentle engine braking, between 4 and 3 k revs....
your thoughts?
(p.s. am still recovering from the nearly 6 hours spent going to/from Goodwood on sunday, and I'm still grinning, and I can still hear that rumble in the background.....)
what two boxes?
all mine has is a 'cherry bomb' effort in the middle....
as for engine braking - best to try this out on a track day.... discovered at bruntingthorpe that changing down 'late' into a corner (i.e. after I'd started the turn), caused the rears to lock momentarily, resulting in a lot of (eventually) controlled fishtailing.
blipping the throttle to try to match the wheel/engine revs helps (and sounds good!)
I guess the expression 'to set up for the corner' does actually mean something......
When I had the 'coached' laps with one of the pro drivers, he was merciless with the engine braking (breaking?).... and the brakes.
Question: what's the 'best' way to generate the over-run noise....
IMHO: gentle engine braking, between 4 and 3 k revs....
your thoughts?
(p.s. am still recovering from the nearly 6 hours spent going to/from Goodwood on sunday, and I'm still grinning, and I can still hear that rumble in the background.....)
The early 350is had tiny silencer boxes going over the half shafts at the rear.
Toe and heel operation should avoid the rear wheels locking up because you are then changing gear during the braking phase at the end of a straight; you still need to get the revs right though.
Maximum over-run by double de-cluthching from fifth to third (5500 revs) whilst going downhill then take your foot off the throttle! This is also dodgy on the wheel locking front but you did ask. I find that the car pops and bangs plenty without making any special effort.
Toe and heel operation should avoid the rear wheels locking up because you are then changing gear during the braking phase at the end of a straight; you still need to get the revs right though.
Maximum over-run by double de-cluthching from fifth to third (5500 revs) whilst going downhill then take your foot off the throttle! This is also dodgy on the wheel locking front but you did ask. I find that the car pops and bangs plenty without making any special effort.
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