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Discussion Starter · #1 ·
Hi!
Can anyone tell me if the 6pot CP5575 AP RACING calipers would work with the 330mm AP RACING brake discs?

Usually, the 330mm brake discs go with the 4pot CP5200 calipers, while the 6pot CP5575 calipers go with 362mm discs.

But on BMW forums, I have seen quite usually 6pot CP5575 calipers on 330mm discs.

Will this apply also on the SAAB 9-3OG?
 

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Nick Taliaferro may be your best source for an answer.

I believe your reasoning is decent so long as CP5575 is a part number and not a model number with various part numbers depending on the application.
 

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yea, no clue here.... I have the 4pots on my 330-335mm AP brakes, they use to be on my SPG (before that on MTAERO's 9K aero). Love the brakes...... they were awesome on my old SPG & feel just as amazing on the Viggen.

I would think wheel clearance could be more of a issue with the 6pots, so if you want to use 17's at all I would think it could be more difficult to find a set. I use 17's on my car & I used 2-3mm spacers to get them to clear. Presently they have snow tires on them & when money is willing I hope to put a descent set of 18's on the car for summer time.

Do you already have the 6pot calipers? I can get my ABS to kick in pretty easily when it's cool outside under 60mph
 

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Discussion Starter · #4 · (Edited)
yea, no clue here.... I have the 4pots on my 330-335mm AP brakes, they use to be on my SPG (before that on MTAERO's 9K aero). Love the brakes...... they were awesome on my old SPG & feel just as amazing on the Viggen.

I would think wheel clearance could be more of a issue with the 6pots, so if you want to use 17's at all I would think it could be more difficult to find a set. I use 17's on my car & I used 2-3mm spacers to get them to clear. Presently they have snow tires on them & when money is willing I hope to put a descent set of 18's on the car for summer time.

Do you already have the 6pot calipers? I can get my ABS to kick in pretty easily when it's cool outside under 60mph
Fact is, the 6pot CP5575 caliper is thinner than CP5200 4pot. If a 4pot CP5200 fits under a rim, the CP5575 will surely fit, even better.

Anyway, even now I have 6pot 336mm brakes (WP PRO, as presented in my thread), but I will be putting those on the 9-5 and use the AP RACING goodies on my 9-3og Conv. (project car).

The question is if the 6pot CP5575 calipers work with the 330mm discs...?
 

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that's great news they are thinner.....

Have you asked any retailer of AP stuff? Not sure where you live but I am sure they might have info

I just checked out Abbott racing's site & for the 9-3 they list a 330mm rotor with either 4 or 6 pot calipers & they have pics of each setup on their site :) So cool.... the 6 pots do look a bit thinner.... who woulda though :)
 

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Discussion Starter · #6 ·
it works!

After some very pleasant discussion directly with AP Racing specialists, these are the conclusions:
- both 4pot CP5200 and 6pot CP5575 work with 330mm discs;
- the difference is in the thickness of the discs: for CP5200 is 28mm, while for CP5575 is 32mm;
- yet, Abbott Racing uses both 4pot and 6pot with same 330mm / 28mm thick discs. Giles told me that "it might be otherwise, but at least, this is how they do it";
- the 6pot CP5575 calipers would work (and look) better with 356mm / 32mm discs, so this is what I will be putting, to fill up somehow the 19" Hirsch 3 spokes wheels for the summer.
Winter set-up will be with 18x8 Compomotive CXT - White or MO6 - White.
The rest of the progress will posted in "my project" thread..
;)
 

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I can't kill my 330 APs with street 2500 pads! Those 356 x 32 should be crazy, be able to run an organic stock pad material and still be fine.. Now the inertia of the huge "flywheel" would worry me. Whats the weight difference? MOI will be lots greater with the thicker larger friction surface. Maybe you can get lightweight disks in the larger size. For the kit I am working on we have 3 options for the same disk dimension.


One issue I ran into on my Vig is upright flex under braking enough to bind the coils on the coilover springs to the strut insert hold down nut! Only could brake that hard with the slicks on and HOT.
 

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Discussion Starter · #8 ·
pics will follow

I can't kill my 330 APs with street 2500 pads! Those 356 x 32 should be crazy, be able to run an organic stock pad material and still be fine.. Now the inertia of the huge "flywheel" would worry me. Whats the weight difference? MOI will be lots greater with the thicker larger friction surface. Maybe you can get lightweight disks in the larger size. For the kit I am working on we have 3 options for the same disk dimension.

One issue I ran into on my Vig is upright flex under braking enough to bind the coils on the coilover springs to the strut insert hold down nut! Only could brake that hard with the slicks on and HOT.
The added weight is not THAT big:
- CP3580-2898/2899: 330mm/28mm thick, 203.2mm P.C.D.,bolted.... 5.94 kg
(this is usual disc for the SAAB 93og/Viggen BBK, with 4pot CP5200 calipers)
- CP3580-2900/2901: 330mm/28mm thick, 203.2mm P.C.D.,floating....5.6 kg
- CP3047-252/253: 330mm/28mm thick, 203.2mm P.C.D. bolted.........5.1 kg
- CP5000-210/211 -Pro 5000+: 330mm/28mm thick, 203.2mm P.C.D...4.94 kg (this is the new style of AP RACING)
- CP3581-222/223: 330mm/32mm thick, 203.2mm P.C.D.........weights 5.8 kg
- CP3581-536/537: 356mm/32mm thick, 228.6mm P.C.D., bolted.........6.7 kg (this is used by AP RACING for SAAB 9-5og BBK, with 6pot CP5575 calipers)

So in the end, it`s less than 1 kg/wheel...

You might also consider another option for a lighter wheel: search for a wheel with the biggest PCD and "eye diameter", as AP RACING calls it and trim it down the desired dimension. This way, you will get a much lighter disc, IMHO.

What MOI? MO1881, MO1890 or MO1810?

A solution for upright flex under hard braking seems to be the control arms from Sellholm. This is how they describe the uniball control arm:
"Car gets extremely track stable, meaning that it does not move over the road.
Biggest difference is at braking. Stock control arms are bending backwards when braking, witch makes brake/turning very imprecise. These arms do not move at all which gives much better control of the car
."
Waiting for the warmer days to put those control arms on the car...and let everyone know about them ;)
 
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