The GT4 Build…M3 Edition…

[M1500Z]

Great build—I've got a question about those bushings with the holes drilled in them. They appear to be eccentric—is there a reason for that, and how are they installed so they're symmetric between L & R?

++ for all the SPL stuff, and I'm quite jealous of that Drexler diff.

[ninekrpm]

Originally Posted by M1500Z

Great build—I've got a question about those bushings with the holes drilled in them. They appear to be eccentric—is there a reason for that, and how are they installed so they're symmetric between L & R?

++ for all the SPL stuff, and I'm quite jealous of that Drexler diff.

which bushings? the millway ones installed in the rear knuckle?


the diff is

[FaRKle!]

Originally Posted by M1500Z

Great build—I've got a question about those bushings with the holes drilled in them. They appear to be eccentric—is there a reason for that, and how are they installed so they're symmetric between L & R?

++ for all the SPL stuff, and I'm quite jealous of that Drexler diff.

The control arm bushings are eccentric so you can adjust the pivot point for roll center correction.

[M1500Z]

Originally Posted by FaRKle!

The control arm bushings are eccentric so you can adjust the pivot point for roll center correction.

Bloop. Forgot about roll center correction. But that's what I was curious about, if they're eccentric, how are they adjusted and then locked down? Looks like they're just measure twice, press-in once?

[ninekrpm]

Originally Posted by M1500Z

Great build—I've got a question about those bushings with the holes drilled in them. They appear to be eccentric—is there a reason for that, and how are they installed so they're symmetric between L & R?

++ for all the SPL stuff, and I'm quite jealous of that Drexler diff.

Originally Posted by FaRKle!

The control arm bushings are eccentric so you can adjust the pivot point for roll center correction.

Originally Posted by M1500Z

Bloop. Forgot about roll center correction. But that's what I was curious about, if they're eccentric, how are they adjusted and then locked down? Looks like they're just measure twice, press-in once?

In addition to roll-center, it can be used for default camber setting. In my later pics, you will see I have them angled inward.

And yes, measure twice or more and do your best to make them symmetrical on both sides.

[E92inSG]

Originally Posted by ninekrpm

Installed the wing today, secret was the retrofit bracket sourced from bimmertunning…took about 4 hours, pretty much oem like clean fitment…

Car going in for cage in two weeks…will summarize the build in a few weeks.

Hi!, can you please share more on the retrofit bracket? I am also wanted to install the GT4 wing onto my F80 but want to make sure the parts all lin up perfectly. Thank you!!!

[ninekrpm]

Originally Posted by E92inSG

Hi!, can you please share more on the retrofit bracket? I am also wanted to install the GT4 wing onto my F80 but want to make sure the parts all lin up perfectly. Thank you!!!

Please reach out to Stephan on IG - @bimmertuning_m3gt4

[Txipi84]

Congratulation for this project!!

Im thinking to change the oem diff for drexler diff but the point is i would need to re-code the car because drexler diff doesnt use an electrical engine...

Could you help me? Could you give me more information about that?

Thank you man!

[E92inSG]

Originally Posted by Txipi84

Congratulation for this project!!

Im thinking to change the oem diff for drexler diff but the point is i would need to re-code the car because drexler diff doesnt use an electrical engine...

Could you help me? Could you give me more information about that?

Thank you man!

I'm also looking to buy and install the drexler soon!

reached out to @limitedslip.de on IG who will be quoting me soon.

and also @zedcoding who can remotely code out the stock e-diff

[RugbyBro]

That weight you posted on Instagram is absolutely mental

[ninekrpm]

Originally Posted by RugbyBro

That weight you posted on Instagram is absolutely mental

thank you

I owe this post an update here. coming soon...

[ck_M3]

Thanks to this thread, I also followed and got Fall-Line LCA’s with the rear sway bar links, and MMR’s for the front. Didn’t like the idea of the ends exposed; credit to Fall-Line and MMR for having boots on them.

Did your FL LCA’s come with a bracket to mount the headlight leveler? Mine was zip-tied up since ther wasn’t any way to link the leveler to the LCA.

[ninekrpm]

Car finally together…full update coming.

[ninekrpm]

Originally Posted by ck_M3

Thanks to this thread, I also followed and got Fall-Line LCA’s with the rear sway bar links, and MMR’s for the front. Didn’t like the idea of the ends exposed; credit to Fall-Line and MMR for having boots on them.

Did your FL LCA’s come with a bracket to mount the headlight leveler? Mine was zip-tied up since ther wasn’t any way to link the leveler to the LCA.

It did not come with the mounting hole, I just tapped in a M5 hole for the bolt.

[chetrickerman]

If you have time, I would greatly appreciate it if you posted a list of the items you removed for weight reduction. That weight is exceptional and the car has to feel like a rocket!

[johnjames85]

Thank you for this detailed build thread. It has helped me so much with my build.

[johnjames85]

Do you have an email or other contact? I do not have IG.

Please can you share briefly why this is required when using the GT4 bumper.

Also, I cannot find the GT4 bumper in IND site, do you have a link or more info.

Many thanks

[ninekrpm]

Originally Posted by johnjames85

Do you have an email or other contact? I do not have IG.

Please can you share briefly why this is required when using the GT4 bumper.

Also, I cannot find the GT4 bumper in IND site, do you have a link or more info.

Many thanks

Happy to connect.

The GT4 bumper makes installing the GT4 splitter (plug and play). Otherwise you have to cut the OEM bumper quite a bit - however it is possible and few on the forum have gone this route.

IND has access to ordering bmw OEM and motorsports parts. They also have the ability paint parts before sending to you.

I called/emailed Ryan at IND directly and placed the ordered.

[johnjames85]

I found the Slon GT4 splitter which is significantly more expensive than the AP Motorsport GT4 splitter. From comparing the pictures it's far closer to the OEM GT4 splitter and likely stronger.

My question, have you had contact with the kerbs with your splitter? As this is one of the advertised benefits of the Slon splitter. Im trying to understand if the extra cost is worth it.

Thanks

[ninekrpm]

Originally Posted by johnjames85

I found the Slon GT4 splitter which is significantly more expensive than the AP Motorsport GT4 splitter. From comparing the pictures it's far closer to the OEM GT4 splitter and likely stronger.

My question, have you had contact with the kerbs with your splitter? As this is one of the advertised benefits of the Slon splitter. Im trying to understand if the extra cost is worth it.

Thanks

Slon and the bimmerworld are great, and superior to the AP option. Unfortunately, neither was available when I ordered mine almost 3 years ago.

I have had it on my car 15 track days (plus maybe 2500 street miles when my car was streetable) and yes, it has a few scars to prove it…so far holding strong. Uses all OEM hardware, and fitment is great.

I do have the Bimmerworld one on order as a backup, will run this as long as it lasts…let’s see.

[johnjames85]

Originally Posted by ninekrpm

Slon and the bimmerworld are great, and superior to the AP option. Unfortunately, neither was available when I ordered mine almost 3 years ago.

I have had it on my car 15 track days (plus maybe 2500 street miles when my car was streetable) and yes, it has a few scars to prove it…so far holding strong. Uses all OEM hardware, and fitment is great.

I do have the Bimmerworld one on order as a backup, will run this as long as it lasts…let’s see.

Thank you that's great information. Although its made my decision even harder

[johnjames85]

I just wanted to say thank you as you have inspired me to go all out and do a full garage renovation . I won't have the lift but will be making it look worthy of my car collection.