Quote:
Originally Posted by TomHickory
Have same type info need before buying wheels and tires
Hi All,
New to Z4 world. Need some wheel/tire advice.
Just purchased a 2007 Z4 Coupe 3.0si with steptronic with 8 K miles – mint condition. The non M Z4 with steptronic choice is due to a number of complicated reasons. I am a HPDE Instructor with PCA and BMWCCA. Had a dedicated track car. Now need some new Z4 (non M) owner advice in two categories.
Q #1 - What more aggressive wider 18" wheel and tire sizes will fit my non M Z4? Know the non Z4 wheel wells seem to be smaller? I ran CCW Classics 255F and 275R RA's for the track only on my track car. What wider wheel sizes and tires can I run on a non M Z4?? (have 18" x 8 wheels 225F and 18x8.5 255R original run flats). Z4 Suggestions I have gotten is the Hankook Venus V12 Evo for street and occasional DE's? Maybe run 235/40 F on 18” on 8.5 APEX EC-7 F, and 265/35 Apex EC-7's R. What yee think?
Q #2 – How does the non M Z4 with steptronic paddle shifter work for HPDE days on the track?? What modifications would be wise for occasional DE use? Most of the time I am in the student's car so will not do a lot of track hours. If I can get better wheel tire package, do I need to add SS brake lines, more aggressive brake pads?, higher temp brake fluid? Other minor changes that would help for occasional DE use?
I would appreciate some opinions.
Tom
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A bit late but
1) The Non-M's have same tire fitment as the non-M e46 or E36 M3 but with even slightly more clearance. For square, you can run 255 on all 4 on a 9" wide rim, assuming a mid 30 offset. I believe that's what Apex tested their 17" Arc-8's initially. For staggered, stick with a 8 to 8.5" with 225 up front, I had issues with 235/40 due to extra height. Offset should be upper 30's to low 40's (basically shaving off 15mm from factory offsets).
2) No experience with the Step but you'll definitely want track pads and high temp fluids. I had good success with PFC 06 or 08 pads although I recently upgraded to 11's. I stick to Motul 600, full flush beginning of season, and a bleed every 1-2 weekends of events. SS lines are not needed but a nice plus.