What is the bar made off, looks like 1.75 DOM. However I bet the time to remove all the crap inside the car and put it back probably took longer than welding up the cage so that price is accurate. Car Detailing and Show & Shine Prep sponsored by Autogeek.Click to expand.That's somewhat on the expensive side for just the bar 4-point rollbar.Car Audio & Electronics sponsored by Bavsound.Tire & Wheel Forum sponsored by The Tire Rack.Suspension Tech and Handling sponsored by.Professional Motorsports sponsored by Bimmerworld.Track, Auto-X & Drag Racing sponsored by.General BMW and Automotive Discussion sponsored by Intercity Lines.Quick Navigation Track, Auto-X & Drag Racing sponsored by Go Top I know at least one Z3 track junkie who ran a swing-set roll bar that stuck up about 6" over the top of where the roof would be. Or just go for the complete roll bar, assume you can get it high enough. You might consider swapping for a Z4 Coupe. Hardtops are not relevant, except if a local chapter requires it. In a stock Z3 (and I bet Z4), that would require an extremely short driver AND instructor. Optionally chapters may allow cars with fixed rollover protections (including hoops, but no pop-ups), but they must meet the helmet plane requirement too. The cage/bar must be built to spec, one portion of which is that the helmet of both driver and passenger must be 2" below a line between the bar and the front strut tower. (stupid website doesn't give be a direct link).īriefly, a convertible must have a roll bar/cage and 5+ point harnesses. BMW CCA / Procedures & Policies / Operations Manual The Z4 roll hoops are structural saftey item. I know a full cage is the correct solution, however, I am not ready for one yet as my Z4 is still mainly a street car. Is my understanding correct? Does it apply to the Z4 with extendable roll bars?Ģ-If the harness is possible, is there a harness bar for the Z4 Roadster? If not, are there good mounting points? With the harness, the body is not going anywhere therefore, you need the roll cage to ensure that your head does not get injured. This is because stock seatbelts are designed to allow the body to submarine in case of a roll over. I am considering a harness and I have the following questions:ġ- My understanding is that using a harness without a roll cage is dangerous. By the end of a session, both knees ache. I use my knees to support my body while cornering. Would you please share with me what you know regarding the stock Roll Bar and how much protection it provides in case of a roll over? With my helmet on, I am ¼” below the edge of the bar. I use my Z4 Roadster for DE, Autocross, and Drift events.
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March 2023
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