Close

    • BMW M (Motorsport) Division built M73 V12 swap powered E36/7 Z3 roadster - 326 horsepower and 363 pound feet of torque

      Seemingly out of nowhere BMW posted an E36/7 generation Z3 which is sporting a M70 family V12 under the hood. We do not know the exact specs on this V12 but it clearly appears it is from the M70 series which means a 5.0, 5.4, or 5.6 liter V12. This likely is the M73B54 used in the 7 and 8 series models from the 90's so 326 horsepower and 363 pound-feet of torque. The swap is factory clean as it should be with BMW doing it themselves.

      To see a V12 fit so well under the hood of the Z3 is incredible. Space is obviously tight but the engine is fit in very, very cleanly. We wish something like this made production but cool to see BMW thought about the idea and built it as a prototype. We are glad BMW finally showed us they had this.






      This article was originally published in forum thread: BMW M (Motorsport) Division built M73 V12 swap powered E36/7 Z3 roadster - 326 horsepower and 363 pound feet of torque started by Sticky View original post
      Comments 17 Comments
      1. fast4door's Avatar
        fast4door -
        pretty cool, but seems like a waste to me if it only has 326hp..
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fast4door Click here to enlarge
        pretty cool, but seems like a waste to me if it only has 326hp..
        Torque...
      1. Forced Air's Avatar
        Forced Air -
        now lets see one with turbos Click here to enlarge
      1. TZ04XJR's Avatar
        TZ04XJR -
        A very unique swap.. Lets assume the M73 was considered a more "wild" swap than even the S62 back when they drew up plans for this exercise. Or possibly the S62 still wasn't ready if they did this prior to 1998? To it's credit, the a The M73 won the "Above 4 L" category of the International engine of the year awards for 1999.


        Click here to enlarge Originally Posted by fast4door Click here to enlarge
        pretty cool, but seems like a waste to me if it only has 326hp..
        I agree considering the high powered swaps we see today.. It would be fun to beat this thing up for a couple hours though Click here to enlarge

        -TZ
      1. Eleventeen's Avatar
        Eleventeen -
        By today's standards, this would be a big unbalanced waste of time at well under 400hp/400flbs, but back in the 90's, it was probably baller status. Anyway, Dharma & Greg is on, so I gotta go...
      1. flipm3's Avatar
        flipm3 -
        BMW is clearly foreshadowing swapping an S65B40 into the Z4.....in my dreams at least Click here to enlarge
      1. lughed's Avatar
        lughed -
        Click here to enlarge Originally Posted by flipm3 Click here to enlarge
        BMW is clearly foreshadowing swapping an S65B40 into the Z4.....in my dreams at least Click here to enlarge
        Dropping these images now, you could be right. Im sure they have already done it. This is not the first time BMW has done one off swaps like this. In the case of a v8/Z4 it may come to production....... in my dreams at least Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        I just don't understand why we don't have an M Z4 already. They are putting the badge on everything.

        They want to race with the V8 in the Z4 as well. Just $#@!ing do it already.
      1. Sorena's Avatar
        Sorena -
        There is a similar car in Norway rocking a pair of turbos.
      1. 600whp S4's Avatar
        600whp S4 -
        M5 v8 is waay better swap
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
        M5 v8 is waay better swap
        Sure, but this is still cool.
      1. singletrack's Avatar
        singletrack -
        Probably sounds awesome with the roof down. Cool car...not about being the fastest; more about driving experience at this point. Although I bet this thing hauls total ass.
      1. inlineS54B32's Avatar
        inlineS54B32 -
        From Carscoop:

        After breaking the photo story on the BMW M division's one-off, V12-powered Z3 prototypeearlier this week, we can now share with you some interesting details surrounding its creation, though as you will soon find out, we may need the help of our German speaking readers.
        We'll get straight to the point and let you know what Matthew Russell, Product and Technology Communications Manager for BMW North America, told Carscoop about the Z3 M V12 after he did some digging of his own:
        Click here to enlarge"The car was built in 1999 and was the proof that all engine sizes of the time fit in the roadster," said Russell. "It was shown only once: in August 1999 to the German car magazine Autozeitung."
        As we rightly assumed, the ultimate M model of the Z3 roadster series borrowed BMW's M73 5.4-liter V12 engine from the E38 750i/iL sedans and E38 850Ci coupe of the mid-1990s to early 2000s.
        The 12-cylinder engine was rated at 322hp (326PS) at 5,000 rpm and 490Nm (361 lb·ft) at 3,900 rpm, and was linked to a 6-speed manual gearbox driving the rear wheels.
        According to the 1999 article from Autozeitung, the Z3 M V12 was capable of accelerating from standstill to 100km/h (62mph) in 5.5 seconds, to 1,000m (0.62 miles) in 24.4 seconds, and reach a top speed of 263 km/h (163mph).
        By comparison, the production Z3 M Roadster model sported an M3-sourced 3.2-liter naturally aspirated straight-six delivering 321hp (325PS) and 353 Nm (261 lb·ft) in EU specification.
        We also learn that the Z3 M Roadster V12 was fitted with 17-inch wheels in 225/45 tires up front and 245/40 at the back and that it tipped the scales at a hefty 1,400kg (3,086 pounds).
        As mentioned in the beginning of our story, we’d appreciate it if any of our German-speaking readers could provide a translation of the main points mentioned in the magazine article.
      1. Sticky's Avatar
        Sticky -
        Heh I guessed the engine correctly Click here to enlarge
      1. 335i guy's Avatar
        335i guy -
        Needs a turbo.
      1. 335i guy's Avatar
        335i guy -
        Sorry for double post.
      1. lamia2super's Avatar
        lamia2super -
        beast