The car is back under development, and I will be posting on this thread over the next couple months.
As a quick recap, we had done much FBO and much of the suspension in then first phase (V1) of this car, along with bodywork, I had also begun work on changing out the stereo system (along with some sound deadening). To date, work on the car has been done by Barry Battle (
3DMMotorsport, tuning by Dimitri (
BQ), and of course work by myself.
The car is about to head over to Barry Battle's shop for a months work. He and I will be working together, as we have in the past.
I have decided to share my ongoing build sheet, since it largely consolidates modifications in one succinct place and may be of value to others:
Google Build Sheet.
To summarise the V2 phase of work being done. I am looking
to prepare the car for a reliable 600whp - by that I mean I expect the car to support 100k miles of moderate to sometimes full use at that power level:
- Complete suspension upgrades - coilovers, few remaining joints have spherical or ball joints.
- Upgrade ignition system to reliably spark at new power levels.
- Upgrade fuel system (direct injection only) to run at target power levels.
- Prepare for an hopefully add flex fuel implementation.
- Stiffen transmission and rear subframe to handle power levels, without significant NVH increases.
- Upgrade clutch/flywheel to support power level.
- Finish the stereo and sound deadening work I did over the summer.
- We are discussing upgrading the turbos (without we're closer to the 500whp target). This is still up for discussion, and we've not completed committed to V2, or whether its a next phase (V3) project.
By continuing to post here, I hope some of this information is useful to others. The E89 Z4 is similar to other BMWs yet has many many nuances that are a pain to deal with along the way to making changes. It's always the little things - like the bimmerlife smart coil setup going into the car: one would think N54, it is the same as the E90 which shares the same motor, but Alex had to make the wiring loom a bit longer for the Z4. And so it goes.
I hope the above build sheet is helpful to others. If I or Barry can answer any questions, if we know the answers we are glad to share. Barry has, for better or worse, become a bit of an expert on the E89 by school of hard knox. The car sent him into the machine shop to mill new parts or modify existing parts many times. I doubt this go-around will be much different.
Filippo