X5 wheels on Z4
- Thread starter Johnbmwz4
- Start date
What? 
Can't see why you would want to fit a heavy 4x4 wheel on a Sports car. Style over performance
Each to their own of course.
Each to their own of course.
markplant said:
Wrong car Mark!
Page 10 onwards.
http://www.z4-forum.com/forum/viewtopic.php?f=2&t=47027&start=135
As for the logistics...[ref=#006600]cj10jeeper[/ref] hit the nail on the head with the issues of running them on the car.
Unsure of how the fitment would be on standard suspension, but you'll certainly need spacers if running with coilovers. I needed 10mm front and back on my coupe but am going to need 20mm on the front with the roadster purely down to different suspension setups (KW's on the coupe and BC's on the roadster)
With that said and done, I am planning on throwing them on the roadster now as they're just sat in the garage.
goldbcfc said:
You're sort of right, but unsprung weight itself (calipers, carriers, axles, etc.) won't affect performance much more than sprung weight, but can make bumps and the like worse. What we're talking about here is rotational mass (wheels, disks, driveshafts) where it takes more energy to spin up and stop a rotating wheel. Rule of thumb is that it affects performance at something like x4 that of the mass added.
If we take your 4x5kg then that's like adding 80kg to the weight of the car, or a another way an extra passenger... Results in slower acceleration, worse braking performance and harder to turn (think gyroscopes)
You can go one step further and say that a 4x4 wheel probably has more mass at the rim than centre to stop failures on rough ground so further increase the negative effect.
There made for a vehicle of 2 tonne has no place on a 1350 kg vehicle. I've seen a lot of the E46 owners try this mod over the last few years. Many then have them back up for sale within weeks/months of trying them not listening to what everyone told them prior. Extra weight will be ruining the handling then there's the wrong offset they will be too. May stress the hubs much quicker now the weight is pushed outwards from hub/bearings. Turning in/out of corners will be less controlled, Brakes/tyres will wear a lot quicker. Steering wheel self centre motion will be slower to correct itself stressing the PAS. You will rarely see evo's or subaru's on big wheels they always use smallest ratio not 19" for this reason.
just my opinion
just my opinion
I have run X5 wheels on a 3.0i with no suspension modifications whatsoever. There was some slight rubbing on the front of the arch liner over the biggest bumps, but that soon stopped. That was with 235 wide tyres on the front - it really should be 225.
I didn't think they made the car handle awfully and the ride quality was actually very acceptable - certainly better than 18' runflats. But of course everyone knows better than the people that have run them personally. I have been meaning to weigh them because I don't think there is that much difference, In any case I would rather run a strong dependable OEM wheel, than cheap reps that buckle and crack (been there before!)
I will either sell them, or keep them for use as a winter wheel, as I'm liking my refurbed 108's and want to keep them that way. I think they look good on a Z4 in the right circumstances, I had loads of colleagues and friends raving about them - if such things matters to you.
I didn't think they made the car handle awfully and the ride quality was actually very acceptable - certainly better than 18' runflats. But of course everyone knows better than the people that have run them personally. I have been meaning to weigh them because I don't think there is that much difference, In any case I would rather run a strong dependable OEM wheel, than cheap reps that buckle and crack (been there before!)
I will either sell them, or keep them for use as a winter wheel, as I'm liking my refurbed 108's and want to keep them that way. I think they look good on a Z4 in the right circumstances, I had loads of colleagues and friends raving about them - if such things matters to you.
The speed rating of the tyre would be dangerous fitting a V rated tyre (149mph) 17" when a W rated tyre (169mph) 19" is suited. Evo's and Subaru's don't need huge wheels because there all about acceleration. They handle brilliant on skinny 17/18 inch wheels just like the E30 M3 handled great and had smaller wheels too. The original pre-facelift E46 M3 came standard with oem 18 inch alloys fiited from factory. It was only when it got face lifted later in 2003 when 19" alloys were introduced. The car in your picture is a limited CSL it would have had light weigh designed 19" CSL alloys fitted so no acceleration was affected. When you compare the ratio its probably no bigger to using the 18" with bigger tyre profile to using the 19" with smaller tyre profile. That's why you have lightweight alloys for track that cost a lot more than the regular wheels for road.mr wilks said:goldbcfc said:
Makes you wonder why the BM techies didn't opt for 17s to make this perform better :wink:
bony_13 said:I have run X5 wheels on a 3.0i with no suspension modifications whatsoever. There was some slight rubbing on the front of the arch liner over the biggest bumps, but that soon stopped. That was with 235 wide tyres on the front - it really should be 225.
I didn't think they made the car handle awfully and the ride quality was actually very acceptable - certainly better than 18' runflats. But of course everyone knows better than the people that have run them personally. I have been meaning to weigh them because I don't think there is that much difference, In any case I would rather run a strong dependable OEM wheel, than cheap reps that buckle and crack (been there before!)
I will either sell them, or keep them for use as a winter wheel, as I'm liking my refurbed 108's and want to keep them that way. I think they look good on a Z4 in the right circumstances, I had loads of colleagues and friends raving about them - if such things matters to you.
oem z4 wheel weighs approx. 12kg and X5 wheel weighs 19kg each so yeah they weigh a hell of a lot more which affects fuel consumption, accelleration, braking, handleing, steering rack, tyres, suspension etc.