Differences between CSL and Normal M3 engine

[dxb335d]

Whats the differences?

i thought the CSL engine was 20+bhp more than a regular M3.

I Know it has a Carbon intake but what else is different? different cams? etc?


Carlos

[MaKSiNG]

Carlos,

Have a look at what Thorney say:
http://www.thorneymotorsport.co.uk/tuning/E46_M3_C...

MaKS

[noble3r]

Evo quote,

E46 M3 - 219bhp/ton and 12.3 seconds to 100mph
CSL - 255bhp/ton and 12.0 seconds to 100mph

the all important bhp/ron figure is vastly different yet to a 100mph the CSL would only be half a car length ahead. This has always confused me especially as the CSL has the faster gearchange.

In most occasion a difference of 36bhp/ton between 2 cars would see a bigger differnce than 0.3 sec's to 100mph. For example,

porsche cayman S - 219bhp/ton and 12.2 to 100mph
porsche carrera S - 246bhp/ton and 10.9 to 100mph

With this in mind i've always questioned the output figures published for the CSL

[robm3]

noble3r said:

Evo quote,

E46 M3 - 219bhp/ton and 12.3 seconds to 100mph
CSL - 255bhp/ton and 12.0 seconds to 100mph

the all important bhp/ron figure is vastly different yet to a 100mph the CSL would only be half a car length ahead. This has always confused me especially as the CSL has the faster gearchange.

In most occasion a difference of 36bhp/ton between 2 cars would see a bigger differnce than 0.3 sec's to 100mph. For example,

porsche cayman S - 219bhp/ton and 12.2 to 100mph
porsche carrera S - 246bhp/ton and 10.9 to 100mph

With this in mind i've always questioned the output figures published for the CSL

Isn't the Evo figure for the CSL a proper 'tested' figure whereas the standard E46 is from manufactor?
Seem to recall something like that as they show tested figures in bold.

[Hedgetrimmer]

Autocar timed the CSL in 10.9 secs. EVO do their times two up and with a full tank as well. They also were not too fushed about the original car they tested so I wonder whether it was suffering front clutch slur when they tested it.

[RatBoy M3CS]

John Thorne tells me that most M3, & CS's are about 320-330bhp.. on his rolling road..

But BMW save theyre best engines for the CSL cars and they are all 360bhp...

This does make a fair amount of difference on the track.. with the 100kg weight penalty, its like me carrying a passenger and a CSL solo... big big difference on the track...

Unless you change the brakes and suspension of course.. and you can keep up with them..

[m12_nathan]

Not sure I believe that all CSL engines put out 5bhp more than BMW quote?

[RatBoy M3CS]

I guess it depends on the ambient temp in cell on the day, and the calibration of the dyno, rolling roads are a best guess calc really not quite as accurate as the engine bolted straight to a dyno.. but round or thereabouts figures..

Either way they pull away from me at present.. . +30bhp and a minus 100kg is a big difference to close.. thanks mr A/P ..

Its not unusual for an OEM to save the best engines for the track versions.. blueprinting can make a big difference, with stock parts just selecting the biggest and or smallest tolerance parts with cc'd combustion chambers, matched rods / pistons etc can make a big difference..

I believe the CSL motors have oversize inlet valves and an ECU + airbox to get the results ..



R..