Willow Springs Raceway w/ Hoosiers & Race Pads

[Shellbrook76]

If you end up going square 19’s let me know what wheels/tires work.

[spiff]

Originally Posted by Shellbrook76

If you end up going square 19’s let me know what wheels/tires work.

Will do. Sounds like in order for me to go square, like if I were to do a 10.5" in the front, i'd have to run 12mm spacers (on a et45 wheel that Apex makes).

[vafan13]

Originally Posted by spiff

Will do. Sounds like in order for me to go square, like if I were to do a 10.5" in the front, i'd have to run 12mm spacers (on a et45 wheel that Apex makes).

What was the offset on the BBS 10.5s that fit up front?

[spiff]

Originally Posted by vafan13

What was the offset on the BBS 10.5s that fit up front?

So the BBS's are 20x9" ET 29, and 20x10.5" ET33.

SO fitting the 10.5"s up front in ET33 was fantastic. APEX makes 19x10.5"s in ET 45, so I'd just need to do 12mm spacers if we were to run square.

Best,

[vafan13]

Originally Posted by spiff

So the BBS's are 20x9" ET 29, and 20x10.5" ET33.

SO fitting the 10.5"s up front in ET33 was fantastic. APEX makes 19x10.5"s in ET 45, so I'd just need to do 12mm spacers if we were to run square.

Best,

Nice. I thought about buying another set of our stock rears but didn't want a 295 on a 10" on front. Guess one could stay staggered and do a 275/35 on it. Not sure why BMW only used 9"/10" on the M5 but 9.5"/10.5"on the M6.

Do you know if those Apex 19s clear the front rotor? I had actually seen them before and wondered about them.

Edit: I guess they would given you had other apex 19s on with the hoosiers. Forgot about that

[spiff]

Originally Posted by vafan13

Nice. I thought about buying another set of our stock rears but didn't want a 295 on a 10" on front. Guess one could stay staggered and do a 275/35 on it. Not sure why BMW only used 9"/10" on the M5 but 9.5"/10.5"on the M6.

Do you know if those Apex 19s clear the front rotor? I had actually seen them before and wondered about them.

Edit: I guess they would given you had other apex 19s on with the hoosiers. Forgot about that

Which Apex's? Mine do...

[Shellbrook76]

Originally Posted by RPiM5

Good stuff!

People don't realize the F10 M5 is a track weapon with the right setup and right driver.

And yes you can run a wider front tire. I run 285mm on my fronts currently.

And let's not forget the huge advantage the F10 has over the F90, that weight over the front axle from the AWD system. It's a 132lbs difference in weight over the front axle between the two cars.

Looks like you killed it on the track. Well done.

Do you run the 285mm on the stock front rim?

[RPiM5]

Originally Posted by Shellbrook76

Do you run the 285mm on the stock front rim?

No sir. Aftermarket wheels.

[Shellbrook76]

Did another track day, 275/35/20 up front, 295/30/20 back. PS4. Did amazing, very well. Even just the 275 over the 265 made a huge difference. I’m wondering if I can fit 305 PS4 or Cup2’s in the back on stock 343 wheels on a CP.

[spiff]

Originally Posted by Shellbrook76

Did another track day, 275/35/20 up front, 295/30/20 back. PS4. Did amazing, very well. Even just the 275 over the 265 made a huge difference. I’m wondering if I can fit 305 PS4 or Cup2’s in the back on stock 343 wheels on a CP.

Originally Posted by Shellbrook76

Did another track day, 275/35/20 up front, 295/30/20 back. PS4. Did amazing, very well. Even just the 275 over the 265 made a huge difference. I'm wondering if I can fit 305 PS4 or Cup2's in the back on stock 343 wheels on a CP.

I'm ready for new street tires and was considering moving all the sizes up to 275/305, and would do the same on the track setup as well. I feel like that should fit totally fine.

When I did the 295's up front on shit Kumhos I was amazed at the grip.

[Shellbrook76]

Just ran across this on apex support site.

https://support.apexraceparts.com/hc...-Fitment-Guide

[spiff]

Originally Posted by Shellbrook76

Just ran across this on apex support site.

https://support.apexraceparts.com/hc...-Fitment-Guide

Sweet! If only they made this page before I bought wheels from them! lolllll

[Shellbrook76]

They used a familiar car in their pictures.

For track staggered, they are recommending 9.5 in front and 10.5 in back. That seems it would limit tire size up front. What size/offset did you end up getting?

[spiff]

Originally Posted by Shellbrook76

They used a familiar car in their pictures.

For track staggered, they are recommending 9.5 in front and 10.5 in back. That seems it would limit tire size up front. What size/offset did you end up getting?

You know this is my car right?

They suggested 9.5 front and 10" rear. i went with 265/35-19 Hoosiers up front and 295/35-19 in the rear.

[Shellbrook76]

Originally Posted by spiff

You know this is my car right?

They suggested 9.5 front and 10" rear. i went with 265/35-19 Hoosiers up front and 295/35-19 in the rear.

Yes indeed. Your car out at the track.

I got the negative camber and Dinan bushings on mine. Loving the drive. Greatly improved turn in. My next upgrade is likely the Dinan springs/roll bar. Any opinions?

[spiff]

Originally Posted by Shellbrook76

Yes indeed. Your car out at the track.

I got the negative camber and Dinan bushings on mine. Loving the drive. Greatly improved turn in. My next upgrade is likely the Dinan springs/roll bar. Any opinions?

Do you notice a difference with the negative camber arms? I wanted to get those but everyone was saying they are rebadged OEM and don't do anything?

[Shellbrook76]

Originally Posted by spiff

Do you notice a difference with the negative camber arms? I wanted to get those but everyone was saying they are rebadged OEM and don't do anything?

The Dinan ones are rebadged OEM upper control arms that bmw makes to help with cars that have been in an accident.

https://www.bmwpartsdeal.com/parts/b...127849503.html

The right one part number ends in 504. They are shorter than the ones that come stock, giving you static negative camber of only 0.5. But as you know, our cars are double wishbone and as the suspension compresses, that shorter upper arm pulls the upper part of the tire in and my suspension shop measured -3.2 degrees at max deflection. Very nice dynamic negative camber. Made a huge difference. Order the upper control arms from any bmw shop or fcpeuro.

[vafan13]

Originally Posted by spiff

You know this is my car right?

They suggested 9.5 front and 10" rear. i went with 265/35-19 Hoosiers up front and 295/35-19 in the rear.

Did you talk to them about 10s in the front? Especially considering what you'd already fit up there before, I'm surprised you ended up with 9.5s.

[spiff]

Originally Posted by vafan13

Did you talk to them about 10s in the front? Especially considering what you'd already fit up there before, I'm surprised you ended up with 9.5s.

So I told them i wanted as much meat as possible, and they couldn't recommend me anything wider than stock (at the time). So I had to bite the bullet and do some experimenting myself. Then I showed them all the pictures and experiences I had, and then it looks like they created their own write up about it based on that fitment.

If I were to do again I'd do 10.5 all around and make sure the fitment up front matched when I had my BBS rears up front.

[vafan13]

Originally Posted by spiff

So I told them i wanted as much meat as possible, and they couldn't recommend me anything wider than stock (at the time). So I had to bite the bullet and do some experimenting myself. Then I showed them all the pictures and experiences I had, and then it looks like they created their own write up about it based on that fitment.

If I were to do again I'd do 10.5 all around and make sure the fitment up front matched when I had my BBS rears up front.

Gotcha. Your experience with the BBS rears on front was my inspiration for trying to find another pair of 343M rears to use on the front with 275s. Figured if you got that to fit, 275/35s on a 20x10 ET34 would be fine. Unfortunately, I've so far failed to actually get anybody to sell me some.


And to anyone wondering why a 275 on the 10 instead of a 285, two reasons:

1) 275/35 on 10" should be same diameter in-practice as the stock 265/35 on 9", so no risk of issues with ABS/traction control and reduces risk of rubbing.
2) The wider wheel relative to section width should help improve steering response and initial turn-in. My experience is this thing needs all the help with initial turn-in that it can get.

[spiff]

Originally Posted by vafan13

Gotcha. Your experience with the BBS rears on front was my inspiration for trying to find another pair of 343M rears to use on the front with 275s. Figured if you got that to fit, 275/35s on a 20x10 ET34 would be fine. Unfortunately, I've so far failed to actually get anybody to sell me some.


And to anyone wondering why a 275 on the 10 instead of a 285, two reasons:

1) 275/35 on 10" should be same diameter in-practice as the stock 265/35 on 9", so no risk of issues with ABS/traction control and reduces risk of rubbing.
2) The wider wheel relative to section width should help improve steering response and initial turn-in. My experience is this thing needs all the help with initial turn-in that it can get.

If I could have it my way it would be 305's all the way around. I feel like 305's up front could work especially since I put the 295's rears up there.

We'll see... I'm also interested in something with a wider selection of track-oriented wheels, but also don't want to put the M5 to sleep.

[vafan13]

Originally Posted by spiff

If I could have it my way it would be 305's all the way around. I feel like 305's up front could work especially since I put the 295's rears up there.

We'll see... I'm also interested in something with a wider selection of track-oriented wheels, but also don't want to put the M5 to sleep.

I know what you mean. It's obviously not the best track car, but there is something satisfying about throwing a large, high-power car around a track. I always enjoy watching the Galaxies and Fairlanes in the Goodwood St Mary's races. I think I've watched the one of Tom Kristensen in the Hollman-Moody Fairlane at least a half dozen times.