S54B32

[pilchardthecat]

What are the the specific differences between the M3/Z4M and the CSL?

I know the CSL has a different intake system, but what else is there? There's about 20bhp between them and i would have thought no more than half of that could come from an airbox

[Cheburator mk2]

pilchardthecat said:

What are the the specific differences between the M3/Z4M and the CSL?

I know the CSL has a different intake system, but what else is there? There's about 20bhp between them and i would have thought no more than half of that could come from an airbox

The M3 uses a different exhaust system from the Z4M/CSL, which share the same primary headers... The CSL uses sharper cams and someone mentioned higher compression pistons, but I have never bothered to compare part numbers. Lastly, the CSL also has freer flowing cats and a more aggressive Alpha N based map

[Great Pretender]

Cheburator mk2 said:

pilchardthecat said:

What are the the specific differences between the M3/Z4M and the CSL?

I know the CSL has a different intake system, but what else is there? There's about 20bhp between them and i would have thought no more than half of that could come from an airbox

The M3 uses a different exhaust system from the Z4M/CSL, which share the same primary headers... The CSL uses sharper cams and someone mentioned higher compression pistons, but I have never bothered to compare part numbers. Lastly, the CSL also has freer flowing cats and a more aggressive Alpha N based map

I also believe that the CSL has a modified head, but I'm not sure if this is just journalistic hyperbole or actual fact.

[E30M3SE]

ETK shows same part # for csl and M3.

[Mr Bimmer]

The head and pistons are the same on both.

Power wise, the CSL has 200 cel cats as opposed to 400 cel. Along with Alpa N mapping and carbon airbox, Better cams and larger intake valves.

All this adds up to a 17bhp power increase over the standard M3

[pilchardthecat]

So the whole aftermarket induction thing on the Z4M is for the noise....?

[clabcon]

Mr Bimmer said:

The head and pistons are the same on both.

Power wise, the CSL has 200 cel cats as opposed to 400 cel. Along with Alpa N mapping and carbon airbox, Better cams and larger intake valves.

All this adds up to a 17bhp power increase over the standard M3

+1

[playalistic]

pilchardthecat said:

So the whole aftermarket induction thing on the Z4M is for the noise....?

Was for me! I fitted the gruppe-m. Highly recommended, if a little expensive.

[pilchardthecat]

playalistic said:

pilchardthecat said:

So the whole aftermarket induction thing on the Z4M is for the noise....?

Was for me! I fitted the gruppe-m. Highly recommended, if a little expensive.

I've been considering one of those - i take it there is no need to mess with the ecu etc?

[BenGismo]

ENGINE DIFFERENCES BETWEEN NORMAL M3 AND M3 CSL

ENGINE & GEARBOX-360bhp @ 7900rpm, 370nm 273lb-ft @ 4900rpm
-Thinner exhaust walls
-Carbon fibre air collector & air intake with modified air flow,
-Camshafts with longer valve opening periods,
-Optimised exhaust valves,
-Modified exhaust manifold,
-Funnel shaped pipes leading into the air silencer,
-Modified transmission & final drive ratio’s,

Complete List by CA Automotive at:
http://www.ca-automotive.co.uk/items/M3VsCSLSpecDi...

[playalistic]

pilchardthecat said:

I've been considering one of those - i take it there is no need to mess with the ecu etc?

I didn't (yet) and you don't have to as the ECU adapts to the airflow. To be honest I think performance gains are very doubtful, it's just for the induction noise. Some people have had a remap after fitting the intake plus an after-market exhaust (over on the Z4 forum) so it could be worth investigating...

[dan101smith]

clabcon said:

Mr Bimmer said:

The head and pistons are the same on both.

Power wise, the CSL has 200 cel cats as opposed to 400 cel. Along with Alpa N mapping and carbon airbox, Better cams and larger intake valves.

All this adds up to a 17bhp power increase over the standard M3

+1

-1

17PS increase from 343PS to 360PS.

Slightly less in BHP.

Anecdotal evidence suggests that CSLs don't make their stated power on the rollers, however.

[ga41]

I heard playalistic's car in person and it does sound gorgeous, needs a nice exhaust to compliment it though!

[Great Pretender]

dan101smith said:

Anecdotal evidence suggests that CSLs don't make their stated power on the rollers, however.

Not sure thats entirely the case chap; most seem to make between 355 and 365 bhp according to the bods on the CSL register.

[pilchardthecat]

playalistic said:

pilchardthecat said:

I've been considering one of those - i take it there is no need to mess with the ecu etc?

I didn't (yet) and you don't have to as the ECU adapts to the airflow. To be honest I think performance gains are very doubtful, it's just for the induction noise. Some people have had a remap after fitting the intake plus an after-market exhaust (over on the Z4 forum) so it could be worth investigating...

I'd be happy with some extra induction noise - not bothered about extra hp and i've heard some of the aftermarket exhausts and i actually thing they drown out the engine too much.

[playalistic]

ga41 said:

I heard playalistic's car in person and it does sound gorgeous, needs a nice exhaust to compliment it though!

I'll be receiving my Remus backboxes soon

[ga41]

playalistic said:

I'll be receiving my Remus backboxes soon

Nice! What steered you towards them?

[playalistic]

ga41 said:

Nice! What steered you towards them?

OE look pipes (actually better than OE but similar diameter) and just a little louder and deeper than stock

[Mr Bimmer]

dan101smith said:

-1

17PS increase from 343PS to 360PS.

Slightly less in BHP.

Anecdotal evidence suggests that CSLs don't make their stated power on the rollers, however.

Sorry, 16.8bhp

[clabcon]

dan101smith said:

-1

17PS increase from 343PS to 360PS.

Slightly less in BHP.

Anecdotal evidence suggests that CSLs don't make their stated power on the rollers, however.

-10 17 PS = 17 BHP