RE: The BMW questions you were afraid to ask.
The carbon fibre resin used in motorsport applications(ie: CSL airbox) is resistant to high temps so when air is passing through, it will remain cool and act as a stronger barrier from the ambient engine bay temps.
There will be less friction for the air to pass over smooth carbon surfaces as opposed to rough plastic so a carbon airbox will be able to move air faster in to the intake.
RE: The BMW questions you were afraid to ask.
Alot is probably marketing guff though...afe say my intake will give
a max increase of 20 bhp and 27 ft lbs (albeit on a 330)
http://i139.photobucket.com/albums/q...psdb49ucdv.png
The BMW questions you were afraid to ask.
Why do model designations often not match up to the engine size?
Eg 318i E46 is 1.9
323i is 2.5
740i is 4.4?
320i 2.0/2.2
And many many more...
It's odd. I'd be tempted to badge mine as 319i except you can't get a 9.
Re: RE: The BMW questions you were afraid to ask.
Quote:
Originally Posted by John_D
Why do model designations often not match up to the engine size?
Eg 318i E46 is 1.9
323i is 2.5
740i is 4.4?
320i 2.0/2.2
And many many more...
It's odd. I'd be tempted to badge mine as 319i except you can't get a 9.
Rounded up or down I assume?
RE: The BMW questions you were afraid to ask.
most of these differences are made to explain more accurate engine power .not by CC but by BHP ,so its much easier to know which is which . and im not 100% sure ,but have heard that in Germany insurance is by exact model,not CC .lets say E39 523i and E39 525i , 523i will be difference insurance group cos it has only 170bhp as 525i has 192 ,and so on.
RE: The BMW questions you were afraid to ask.
I always thought it was a marketing exercise, to ensure a greater model spread for prospective buyers.
For example with the E46:
"The E46 323, despite having a 2.5L engine, was designated "323" and not "325", to increase the apparent spread between it and the correctly numbered 328 to appeal to BMW enthusiasts.
http://en.wikipedia.org/wiki/BMW_3_Series_(E46)
RE: The BMW questions you were afraid to ask.
Quote:
Originally Posted by Gitzer
Would having a cone filter surrounded by a carbon open ended box have a negative effect on performance and response if the car has no additional map for it?
Also as far as i can see there is no cold air feed to it.
just performance filter , dont need any special map.but if its carbon air intake box ,it does need special mapping .
cold air intake -feed ,its little bit wrong in your understanding :wink: usual car ,non CSL which has it from factory , has normal air box ,which is under bonnet ,where its very high temperatures ,temperature of engine heat .air boxes ,most of them ,has air restrictions ,these are made for better power and fuel economy ,and air filter -paper one ,to reduce air intake noise for comfort driving .who would like to drive 7 series with some cold air intake on V8 ,probably non of their owners :hehe!: we not talking about boy racers :tounge: cars from factory are never made to get more as possible BHP ,its made with limits
so carbon boxes gives easier way for air from outside to the engine ,bigger amount and no restrictions and cars still has air guides,air is not coming from under bonnet .
and main fact ,its made for more power ,which should be used properly ,not to get numbers on dyno .
RE: The BMW questions you were afraid to ask.
I think it's a bit of both to be honest ^ e36 325's 2.5 has 192bhp out of the box and a 3.15 diff, the 323 with a newer 2.5 has 170bhp (thanks to a restrictive intake manifold and exhaust) and has a 2.93 diff which has a pretty noticeable negative effect on performance. If they called the 323 a 325 it would be as if they made the 325 worse rather than better. The replacement for the 325 was the 328. They obviously named it a 323 as it was more powerful than a 320 but not as powerful as a 325.
Luckily someone somewhere discovered that by fitting the old 325 manifold and a 328 exhaust onto a 323 you can get even more power than a 325 :D and you can choose between acceleration / top speed or a balance between them with a shorter/longer diff. It is somewhat annoying when someone thinks a 323 is a 2.3 and so it is more appealing to have an appropriately badged car. Even the z3 got a "2.3" badge when it was in fact 2.5.....
As far as I understand the 318iS got the 1.9 M44 to cope with the extra weight in the later e36 models. etc
RE: The BMW questions you were afraid to ask.
Quote:
Originally Posted by Peter-E36
I think it's a bit of both to be honest ^ e36 325's 2.5 has 192bhp out of the box and a 3.15 diff, the 323 with a newer 2.5 has 170bhp (thanks to a restrictive intake manifold and exhaust) and has a 2.93 diff which has a pretty noticeable negative effect on performance. If they called the 323 a 325 it would be as if they made the 325 worse rather than better. The replacement for the 325 was the 328. They obviously named it a 323 as it was more powerful than a 320 but not as powerful as a 325.
Luckily someone somewhere discovered that by fitting the old 325 manifold and a 328 exhaust onto a 323 you can get even more power than a 325 :D and you can choose between acceleration / top speed or a balance between them with a shorter/longer diff. It is somewhat annoying when someone thinks a 323 is a 2.3 and so it is more appealing to have an appropriately badged car. Even the z3 got a "2.3" badge when it was in fact 2.5.....
As far as I understand the 318iS got the 1.9 M44 to cope with the extra weight in the later e36 models. etc
i would say u completely wrong . its nothing made wrong !!! all this just made more options for very wide customer range . and what would be the point to get only one or two different engines
RE: The BMW questions you were afraid to ask.