E89 Z4 breaking axles

fmorelli

Lieutenant General
Staff member
Aug 11, 2017
3,639
3,431
0
55
Virginia
Ride
E89 Z4 35i, F10 535d
I've got a buddy with a speedtech setup in a Z4, twin disc ceramic, Michelin Pilot Sports, and he's breaking axles. Had this happen several times now. He says he believes his car is sub 500whp. His previous car was an 800whp Mustang with drag slicks.

Two questions:
1) this make sense to anyone? Thoughts?
2) For the E46-based setup (which is what the Z4 is), are their axle or 8.8 rear conversion possibilities that are not thoopid expensive?

Thanks.
 

SlowE93

Captain
Jul 2, 2017
1,390
1
761
0
Ride
E93
Is he running sticky tires ?
Does he dig the car a lot ?This does seem strange.
 

SlowE93

Captain
Jul 2, 2017
1,390
1
761
0
Ride
E93
No. michelin pilot sports.
Ah, I missed that first time around. Does not make much sense, unless of course, he is making much more than he thinks he is ?
Is he breaking launching or roll ?
I have broken axles and 1 was 2nd gear pull, other was 3rd gear pull.
That alone made no sense since *most* people snap axles on launch.
So who knows 🤷🏾‍♂️
 

SlowE93

Captain
Jul 2, 2017
1,390
1
761
0
Ride
E93
Since you say it is E46 based, possibly swap parts from an E46 M3 ?
 

iminhell1

Sergeant
Jun 17, 2018
414
200
0
factory control arms?
aftermarket, maybe the joint is hyper extending or over compressing?
 

RuskiRacer

Captain
Vendor
Jul 17, 2019
1,209
746
0
Ride
2009 e93 335i
All the times I've broken axles at around that power level is due to wheel hop. Which is also a factor of having to much air in your tires