M£ Z4M engine

Andy said:
Isn't the WIKI an american take on it - they got the detuned version, we got the proper one. It's contradictory above though - the Euro one is 343bhp.

But yep we got lots of little goodies from the CSL too 8)
Click to expand...

Andy, i think the only thing we have from the CSL are the headers as they are both the same parts numbers, the CSL has different cams, intake and engine software.

Apart from those and maybe the rest of the exhaust system, everything else is shared with the E46 M3 and E85/86 Z4Ms.

Edit: Forgot about the brakes! We have the slightly larger CSL brakes on our Z4Ms
 
Yeah same engine,Altho i've said this before i think they should Z4M should have been a little bit more speical from the m3.Bit more differnce looks etc.But that's not the problem.Problem is it ends up being sligthly ligther than its 5 seats big booted cusin.. thus being hardly any faster yet alot smaller.Which i find rather strange.....Should have kept it to 1350KG max..
 
& there's some suspension parts too isnt there.. maybe only on the coupe but antiroll bars iirc, but yes I was thinking of brakes.
 
As Andy says, I think the coupe shares some suspension parts with the CSL. Certainly the suspension set ups of the coupe and roadster differ, as does the steering:

"Scoring 14,500Nm/degree in BMW’s torsional stiffness test, the M Roadster is pretty stiff for an open car, and despite its wide 225/45 and 255/40 rubber on 8.0J and 9.0J x 18-inch alloys rubber, scuttle shake on poor roads in minimal. Even so, it does not come close to the Coupé’s impressive 32,000 Nm/degree, which is more than double the Roadster’s rigidity.

This extra structural strength means that the engineers have been able to dial in much more aggressive suspension settings knowing they will be maintained better even under high lateral loadings on a racetrack.

The springs and dampers are a completely new set-up. The front spring rates are increased by about five per cent, but because the rears are progressive rate it is hard to put a comparative number to them. It is easier to say that that the first half of their travel is similar in rating to the Roadsters, but once that point is reached, their rate rises faster. The characteristics of the Sachs/Boge dampers are calibrated to match.

What makes the Coupé more pointy however, is the combination of a quicker 12.8:1 steering ratio (Roadster 13.7:1) and a 1mm thicker rear anti-roll bar, which combine to mitigate some of the understeer you feel in the Roadster. “Because the Coupé shell is much stiffer, we can load the chassis more on initial turn-in and so improve overall handling response,” explained BMW M’s chassis guru, Gerhard Richter, who is also one red hot test driver."

This is taken from the Pistonheads review of the coupe, which is worth a read:http://www.pistonheads.com/roadtests/doc.asp?c=100&i=15562 and a little more technical than that of the roadster: http://www.pistonheads.com/roadtests/doc.asp?c=100&i=14400
 
The Siemens ECU our cars have is 2 x more powerful than the ECU in the E46 M3... It is also unique to the Z4MC/R. There is no way the Z4M is detuned compared to a E46 M3... Lastly, on the suspension components/steering part sharing with the CSL. The whole rear axle of the Z4MC is a direct lift off the CSL parts bin, while the front is a one off job, very similar to the E36 M3/Z3MC/R. Don't ask me why. As with regards to the steering rack - the Z4MC has the fastest one on offer within the E46/Z cars with 12,8:1 as the CSL is 14,5:1
 
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