Brembo GT Kit and CSL/ZCP Wheels fitment question

[maximus5403]

Sounds like he's not obsessed with functionality.

PSI is handling my install so I will see what they say. I've never run spacers on any car before as I would just change the wheels, but I prefer the stock CSL/ZCP wheels on the E46.

[maximus5403]

https://www.youtube.com/watch?v=tZY4CUACl04

[CarbonBlkM3]

380mm GT Kit

4-pot or 6-pot? Be mindful you actually have more clearance with the 6-piston over the 4-piston calipers because of the more streamlined monoblock design. You're going to need to run spacers up front regardless with which you go with when running ZCP wheels up front.

[Obioban]

If you get into tracking, you’ll regret having got with 380s over 355s.

…. And regret getting 6 piston over 4 pistons, for that matter.

[9kracing]

Does Brembo currently made a 4-pot for our cars?

IND has a set listed, but it's the old F50 calipers... I don't think that's a current kit?

[Obioban]

Does Brembo currently made a 4-pot for our cars?

IND has a set listed, but it's the old F50 calipers... I don't think that's a current kit?

Don't kmow.

Certainly 18 years ago, when I bought my 355/4 brembo GT kit, they did :P

[9kracing]

lol indeed.

I just went from 4-pot to 6-pot and the wheel fitment is much better.

Why would 4-pot be preferable for the track? Easier to modulate?

[Obioban]

lol indeed.

I just went from 4-pot to 6-pot and the wheel fitment is much better.

Why would 4-pot be preferable for the track? Easier to modulate?

Easier to swap pads, which you're doing at least twice every track weekend.

... and 19s are a huge downgrade from 18s on track, and 380s generally force 19s, so 380s are pretty terrible outside of looking cool.

[liam821]

My old M3 had the 355/4pot Brembo GTs, and I ran a 20mm spacer in the front to clear the calipers with the stock front ZCP wheels. I could have probably gone down to a 15mm (maybe), but they definitely don't clear without a spacer.

Here are a few pictures of my old car...

[Obioban]

My old M3 had the 355/4pot Brembo GTs, and I ran a 20mm spacer in the front to clear the calipers with the stock front ZCP wheels. I could have probably gone down to a 15mm (maybe), but they definitely don't clear without a spacer.

Here are a few pictures of my old car...

My memory is that with a 355/4 up front and 345/4 in the rear…
ZCP wheels need 15mm front, 12mm rear
oe 18s need 12 front, nothing rear
oe 19s don’t need anything

[Bimma360]

My memory is that with a 355/4 up front and 345/4 in the rear…
ZCP wheels need 15mm front, 12mm rear

I’ve always assumed something like this isn’t ideal for handling. Am I off?

[9kracing]

IDK if this helps, but I just went from the 4-pot Brembos pictured above to the 6-pot Brembos, and the wheels I use went from requiring a 10MM spacer, to a 3mm spacer... so on my car, the 4-pots stuck out 7mm more than my 6-pots.

This is 355mm kit.

[liam821]

My memory is that with a 355/4 up front and 345/4 in the rear…
ZCP wheels need 15mm front, 12mm rear
oe 18s need 12 front, nothing rear
oe 19s don’t need anything

When I bought the car, it had a 20mm front (but agree, 15mm would work) and no spacer in the rear (plenty of clearance). I had the Brembo 355/4 up front and Brembo 345/4 in the rear. I added a 12mm rear spacer because the rear fitment was pretty sunk-in (see above pictures, no rear spacer)

[Obioban]

I’ve always assumed something like this isn’t ideal for handling. Am I off?

Nope, not off. Increasing the front offset in particular (ala spacers) degrades the geometry pretty quickly.

[bmw m3 s50]

Easier to swap pads, which you're doing at least twice every track weekend.

... and 19s are a huge downgrade from 18s on track, and 380s generally force 19s, so 380s are pretty terrible outside of looking cool.

Is the ease of the pad swap the only benefit? I remember speaking with Dave Zeckhausen, he mentioned there were other benefits using the 4 piston over the 6 piston. I just can't remember what they were.

I have a vague memory, that the 6 piston were 2 piece vs the 4 piston which were 1 piece which improved on pedal feel at the limits?