BMW Z4 GTLM 2015

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Szayelarel

Szayelarel

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The car is wearing a 1975 BMW 3.0 CSL-inspired livery to celebrate 40 years since BMW Motorsport obtained its first victory at Sebring. Two Z4 GTRLMs of BMW Team RLL will wear this special livery during the 63rd edition of the 12-hour race of Sebring scheduled for March 21st.

It was unveiled during the 2015 Amelia Island Concours d'Elegance where Brian Redman, Sam Posey, Hans-Joachim Stuck who were the winners of the 1975 race were reunited while other guests included Jochen Neerpasch, the first managing director of BMW Motorsport GmbH, and BMW Motorsport Director Jens Marquardt. Current BMW Team RLL driver Bill Auberlen had the opportunity to take the special Z4 GTRLM for the first presentation laps.

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GTPorsche
Because they don't have an M4 homologated for GT3 and aren't working on homologating an M4.
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Right, but why? The M4 seems more well-suited to the GTLM class than the Z4 does. (Especially because the street M4 is far more in the same league as the Corvette, the 911, the 458 Italia, and the other GTLM cars' road-going counterparts.)

Maybe it's just a cost thing. They've had the Z4 GT3 for years now, so making a GTLM version was undoubtedly cheaper than homologating the M4.
 
RobertM525
Why BMW is running this in GTLM instead of an M4, I have no idea.
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I'm guessing here, but it's easier to extract the power from a bigger V8 engine reliably, and it's more likely to maintain its driveability in the face of BOP than the smaller 3.0 I6 of the M4. Probably the reason that they will phase out the Z4 GT for the M6... since that also runs a V8, albeit a Turbo one.

Unlike the E92 M3 GTS, which had a bigger V8 engine for homologation of the power unit into the Z4, the M4 GTS will still carry an I6 of the same displacement.
 
MatskiMonk
I'm guessing here, but it's easier to extract the power from a bigger V8 engine reliably, and it's more likely to maintain its driveability in the face of BOP than the smaller 3.0 I6 of the M4. Probably the reason that they will phase out the Z4 GT for the M6... since that also runs a V8, albeit a Turbo one.
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Is there a road-going version of the Z4 with a V8? I thought they all had I6s.
 
RobertM525
Right, but why? The M4 seems more well-suited to the GTLM class than the Z4 does. (Especially because the street M4 is far more in the same league as the Corvette, the 911, the 458 Italia, and the other GTLM cars' road-going counterparts.)

Maybe it's just a cost thing. They've had the Z4 GT3 for years now, so making a GTLM version was undoubtedly cheaper than homologating the M4.
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Because the M6 is replacing the Z4 for 2016.
 

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