18" Square Setup - Rotatable

[ninekrpm]

So it seems that ideally an ET30 offset would be the best spec for these wheels, especially if you are going to run a square setup. The final setup is using a 25mm spacer up front and 12.5mm spacer in the back.

Pics shortly…

[D_SheerDrivingPleasure]

Originally Posted by ninekrpm

So it seems that ideally an ET30 offset would be the best spec for these wheels, especially if you are going to run a square setup. The final setup is using a 25mm spacer up front and 12.5mm spacer in the back.

Pics shortly…

No, I believe the rear axle needs to be ~ET35 or higher. A ET30 with a 12.5mm sacer will give you an effective ET22.5. This will likely rub the rear if using a 18x10.5" wheel. Maybe it fits without a spacer but I wouldn't risk it.

ET35 seems to be optimal for the square setup: it's a direct fit in the rear while minimizing the spacer size in the front.

[D_SheerDrivingPleasure]

It seems that every millimeter counts. I've been telling myself this since I was a teenager.

[SYT_Shadow]

Originally Posted by ninekrpm

So it seems that ideally an ET30 offset would be the best spec for these wheels, especially if you are going to run a square setup. The final setup is using a 25mm spacer up front and 12.5mm spacer in the back.

Pics shortly…

There's no need to reinvent the wheel, people have been running square setups on this car for many years already.

ET30 is too aggressive with a wide tire in the rear. ET36 is no spacer in the rear and 12 or 15mm up front, it seems like the perfect setup to me!

[D_SheerDrivingPleasure]

I can validate what shadow noted above.

Shown below is my inner clearancewith 10.5x18 ET 40, yoko ono ao52 295/30, 20mm spacer and 5" spring with helper.

I was warned about sidewall flex with low psi at the start of sessions but I think I'll be ok.

Getting these photos was like sticking my arm up a cows arse.

Edit: photos orientation is wrong

[markw10702]

Thoughts on an 18x10.5 ET40 VS-5RS on a GTS (factory KW) with a 25mm front spacer? Net ET is 15. Will this clear the KWs in front running a 275/35R18?

[SYT_Shadow]

Originally Posted by markw10702

Thoughts on an 18x10.5 ET40 VS-5RS on a GTS (factory KW) with a 25mm front spacer? Net ET is 15. Will this clear the KWs in front running a 275/35R18?

We're currently running a ET40 10.5 on GTS1. The front clears with a 12-15mm spacer
On GTS2 we have ET36 10.5 and it clears happily with a 10mm spacer.
(In both cases with 295 R7 Hoosiers)

The GTS has *much* more space than the regular F8X. KW in general doesn't give you a lot of space but the billet kingpin/knuckle provides massive clearance

[ninekrpm]

what's the difference between the above two knuckles?

[SYT_Shadow]

Originally Posted by ninekrpm

what's the difference between the above two knuckles?

the one on the left is stock, the one on the right is the GTS

Look at the angle between the table (which would be the plane of the wheel) and the strut connection. The GTS knuckle basically moves the strut away from the wheel, which is what you want for lots of fitment

[ninekrpm]

Originally Posted by SYT_Shadow

the one on the left is stock, the one on the right is the GTS

Look at the angle between the table (which would be the plane of the wheel) and the strut connection. The GTS knuckle basically moves the strut away from the wheel, which is what you want for lots of fitment

never new...awesome!

can the GTS knuckle be a plug play replacement assuming car setup is all SPL parts + MCS's?

is it lighter then oem?

[SYT_Shadow]

Originally Posted by ninekrpm

never new...awesome!

can the GTS knuckle be a plug play replacement assuming car setup is all SPL parts + MCS's?

is it lighter then oem?

It's billet vs cast, not sure about the weight but i imagine that is published somewhere

I've seen MCS setups on GTSs. I recall it uses a different front shock body but you'd have to call BimmerWorld or MCS to confirm.
The suspension arms on the GTS are otherwise stock, so your spl should plug and play.

If i recall correctly these are really expensive.

[ninekrpm]

Originally Posted by SYT_Shadow

It's billet vs cast, not sure about the weight but i imagine that is published somewhere

I've seen MCS setups on GTSs. I recall it uses a different front shock body but you'd have to call BimmerWorld or MCS to confirm.
The suspension arms on the GTS are otherwise stock, so your spl should plug and play.

If i recall correctly these are really expensive.

thanks again...and yes, very expensive

[SYT_Shadow]

Originally Posted by ninekrpm

thanks again...and yes, very expensive

Yup. Strom made a billet E9X knuckle/kingpin and it's also really expensive

In any case, BimmerWorld has already launched their GTMore suspension that allows 11-305 comfortably on all four corners. Some say 11.5 fits square, we shall see

[Jeff80]

Originally Posted by TCom

How wide in inches is a single 305 Pirelli? Contemplating how to transport track wheels to the events. Would like to use a cargo carrier over a trailer.

Late response here. 305/645/18 is about 12.1 wide on an 18x11. All 4 of mine fit in the back seat. I run 18x11 +44 square with an effective offset of +14 up front with Vorshlag camber plates @ 4.5 degrees and an effective offset of +34 out back with all the negative camber I can get on stock arms.

I plan to move to a 325/660/18 in the back this year and 305/660/18 in the front. The car is really really low on the 305/645

jeff

[F82Gundam]

I am running 18x10.5 +20 square setup, with a 10mm spacer up front.

[BMWJEFFREY]

Hello, new here. I've been researching and trying to run a square set up for track. I was thinking running 18x10.5 squared if I can but I see many running spacers as well especially in the front. I'm currently on AST5200 with SPL E9X front end links.

I asked this person on instagram, he also tracks his F8X, he's running 18x10.5 with no spacers. He's on JRZ RZ Pros coils I believe. Link for reference for his wheels, below:
https://www.instagram.com/p/CCWYQ-5B3qi/

I was thinking of running Titan7 E9X squared setup 18X10.5 +25.

Link below:
https://titan-7.com/collections/whee...33593155649624

Will upgrade my stock front LCA and Tie rods to the SPL parts. Need advice, thanks in advance!

[SYT_Shadow]

Originally Posted by BMWJEFFREY

Hello, new here. I've been researching and trying to run a square set up for track. I was thinking running 18x10.5 squared if I can but I see many running spacers as well especially in the front. I'm currently on AST5200 with SPL E9X front end links.

I asked this person on instagram, he also tracks his F8X, he's running 18x10.5 with no spacers. He's on JRZ RZ Pros coils I believe. Link for reference for his wheels, below:
https://www.instagram.com/p/CCWYQ-5B3qi/

I was thinking of running Titan7 E9X squared setup 18X10.5 +25.

Link below:
https://titan-7.com/collections/whee...33593155649624

Will upgrade my stock front LCA and Tie rods to the SPL parts. Need advice, thanks in advance!

ET25 is the wrong offset for the rear. If you run a wide tire it will rub. It's 10mm too aggressive.

There's nothing to fear about spacers. BMW OEM racecars all run front spacers, sometimes truly gigantic 41mm ones.

Edit: this platform is 7 years old. No one is all of a sudden going to discover that the measurements and offsets of the car are different now than they were before. The proper fitment is 10.5 ET36-ET40 to maximize the wheel/tire setup.
If someone decides they will reduce their clearance to not run a spacer, they can do it, but this is not due to a new discovery.

Everyone is free to do whatever they want. Last year a guy at a track event told me he ran 9.5 square on his E92 instead of 10 or 10.5 because the wheels were lighter. I replied "cool story bro"

[BMWJEFFREY]

Originally Posted by SYT_Shadow

ET25 is the wrong offset for the rear. If you run a wide tire it will rub. It's 10mm too aggressive.

There's nothing to fear about spacers. BMW OEM racecars all run front spacers, sometimes truly gigantic 41mm ones.

Thank you for your input on the offset. I'll do more research on it.

I agree that BMW race cars run front spacers especially really big ones but I don't really like the idea of running spacers especially if you spend $2,000+ on a wheel just to run spacers. That's just me.

Dumb question but what brand of bolt on spacers do you recommend? Should I stick with studs bolts or do a stud conversion? If I'm going spacers, I might as well go for the gt3 wheels from SAI motorsports. debating....

[SYT_Shadow]

Originally Posted by BMWJEFFREY

Thank you for your input on the offset. I'll do more research on it.

I agree that BMW race cars run front spacers especially really big ones but I don't really like the idea of running spacers especially if you spend $2,000+ on a wheel just to run spacers. That's just me.

Dumb question but what brand of bolt on spacers do you recommend? Should I stick with studs bolts or do a stud conversion? If I'm going spacers, I might as well go for the gt3 wheels from SAI motorsports. debating....

I think of running spacers as the price to pay to run a square setup that can be rotated. Then it becomes easier.

For a ET36 wheel, the spacer is 12-15mm, no need to bolt them on. I've done bolt on spacers for other vehicles but a track car needs frequent rotor replacements, so I prefer normal slip on spacers.

Everyone does it differently, but I use normal 1500-2000 track wheels. They get banged around, get caked in brake dust, and jump curbs. Sooner or later they bent.
My street car had a nice set of BBS FI, but I would never track those wheels

[EGbeater]

Originally Posted by SYT_Shadow

Yup. Strom made a billet E9X knuckle/kingpin and it's also really expensive

In any case, BimmerWorld has already launched their GTMore suspension that allows 11-305 comfortably on all four corners. Some say 11.5 fits square, we shall see

Well sh*t, this is the first I've heard about this... I'm currently working on installing MCS 1WNRs to accommodate 19x11 305/30-19 and 18x11 315/30-18 square. I spent considerably less than $10.5k though (understood that starting price is for two-way dampers, not one-way; and the package includes a bunch of parts I didn't get):

BimmerWorld GTMore front tie rod ends (manufactured for us by SPL)
BimmerWorld GTMore front upper thrust arms (manufactured for us by SPL)
BimmerWorld GTMore front lower wishbones (manufactured for us by SPL)
BimmerWorld GTMore front sway bar links (manufactured for us by SPL)
BimmerWorld steering rack limiters

https://www.bimmerworld.com/About-Us...F8X-M3-M4.html

[SYT_Shadow]

Originally Posted by EGbeater

Well sh*t, this is the first I've heard about this... I'm currently working on installing MCS 1WNRs to accommodate 19x11 305/30-19 and 18x11 315/30-18 square. I spent considerably less than $10.5k though (understood that starting price is for two-way dampers, not one-way; and the package includes a bunch of parts I didn't get):

BimmerWorld GTMore front tie rod ends (manufactured for us by SPL)
BimmerWorld GTMore front upper thrust arms (manufactured for us by SPL)
BimmerWorld GTMore front lower wishbones (manufactured for us by SPL)
BimmerWorld GTMore front sway bar links (manufactured for us by SPL)
BimmerWorld steering rack limiters

https://www.bimmerworld.com/About-Us...F8X-M3-M4.html

11" front and rear sounds wonderful!

[EGbeater]

Originally Posted by SYT_Shadow

11" front and rear sounds wonderful!

I have a dream...