Hey guys just wonderig are the 6pot ap's that fit under 17" wheels as good as the 355mm kit that you require 18" wheels with.
The reason I ask is I want to be able run 17" wheels for track days.

 

choice of caliper is important. CP5570 uses 330mm disc and is very good. CP7040 and similar can run bigger discs but are not as good.

 

And another option.

BG Developements can now do a kit with the CP5555 caliper, the CP5570's big brother, and 360mm discs. This is also a race derived caliper and most importantly fits under 18" PFF7s.

Fitting mine next week.

 

The 330mm kit is better than the 355 kit as it uses a race derived lighter/more rigid caliper.

Only downside is they dont look as flash other than that theyre better

 

AP 6 pot 330mm setup, which I have and is now totally unfadeable with the new pads I've found

 

Out of interest... what pads mate?

 

> The 330mm kit is better than the 355 kit as it uses a race derived
> lighter/more rigid caliper.

And BGD's new kit uses a "race derived lighter more rigid caliper" and a 360mm disc. Best of both worlds?

 

I use the 330mm kit for track days (so I can use 17 or 18" wheels on 03STi) with Pagid Blue pads all round. Works a treat, no fade and loads of stop, but if giving them a really hard time arranging some ventilation to the disc is important.

 

Actually wether they are as flash or not, the 6 pots are better than the 4 pots.

There is a thread on here about it, IIRC someone got in contact with AP to ask them about why some people thought that their 4 pots were better than the 6 pots, and the guy from AP said that AP should know rather than some know it all from scoobynet.
As well as something along the lines of the 6 pots would be more ideally suited to slick tyres due to the amount of force they can produce.

 

There are different types of 4 pot and 6 pot AP calipers.

CP5200 4Pots are regarded as better than CP7040 6Pots but not as good as CP5570 6Pots for example.

If you look at the list prices for the calipers you will be able to tell there is a wide range of calipers of varying quality, and its not just down to the number of pistons.

 

how can you tell the caliper difference on the car or is it on the box/instructions
martin

 

You can often tell by looking at it. CP5570 from 330mm Imrpeza Kit looks quite different to CP7040.

Have a browse on the AP site or post pic

 

thanks
martin

 

Ive got some 330mm 6 pots for sale at the moment actually if anyones interested........

pm me for details

 

Bugger! I've just ordered me a set of those this week

 

I would always go with 6 pots over 4's...I have! My AP kit only fits under 19s and are the same as used on touring cars - AP confirming this at the time as I was worried they'd not be able to supply brake pads for it in the future - just ask my m8 who loves headbutting the dash

The only time I've ever heard of 4's being better than 6's is when they're one cast items, as on the R1, instead of bolted together two castings.

 

Full-on race calipers then? What CP number?

 

Sure is Bob...bought a few years ago from Powerstation and believe they were only produced for a limited period (they only fit under 19s!). Cant recall the serial, would need to find the documents on it.

Def remember them being race spec with added seal for road use (very very light kit), even the hub (might be magnesium) and disk felt lighter than the oe setup and they're massive.

Really need slicks with these but you can get maximum braking the car/tyres can handle with less brake peddle effort...its mad!

 

As you probably know there are cheap 6 pots kits and the more expensive ones.

most people fit the cheaper CP7040 calipers, which are the ones I was on about and are no doubt very different to your race setup in terms of capability.

 

Ah, got'cha. What's up with the 6 pot CP7040's in terms of performance/quality?

I think any of most of these bigger brake kits are good enough for 1 time only changes - no chance I'll be changing mine for something else

 

Just not as good as some other options.

More pistons does not = better calipers

Stick some pics up if you get a chance

 

I've got some pics at home, will do if I can sort this hosting of pics...

 

I have the 4 pot APs and they rock. Braking is savage and probably adequate for all but the most committed track day guys.

 

Here's mine...hope this link works...

http://i229.photobucket.com/albums/e...Picture024.jpg

 

They look like road CP7040 calipers?

Brake Calipers, Brake Discs, Brake Fluid, Brake Kits, Pads, Clutches from AP Racing

 

Race ones look like this:

Brake Calipers, Air Jacks, Brake Discs, Brake Fluid, Brake Kits, Pads, Clutches, Master Cylinders, Pedal Boxes, Slave Cylinders from AP Racing

 

yr wrong as I have the same kit under my 18 's

 

Hmm, looks like I'll have to check a few things with AP ref kit...

What kit number is yours? My guide says "Subaru Impreza 19" Wheel" on it which I would guess means only 19s? That's what Powerstation told me at the time also. I've got the 362 DISC...

Seems I have CP7040 calipers...doesn't matter as they stop like you wouldn't believe.

 

I guess things have moved on since I bought them a few years ago - I did read they were competion capliers with road seals on at the time, guess not. Still, wouldn't change them for another kit as I have massive over kill on braking, even with coil overs, massive ARBs, 3 strut braces and wide tyres, I still cant use them fully.

 

I wouldn't worry about using the CP7040 caliper as in my eyes they are the best caliper to use for a road/track car , the pistons sizes are exactly the same for the 7040 , 5570 amd the 5555 so the performance of the actual calipers will be the same , there is a very slightly smaller pad on the 7040 caliper , but not so small that 99% of the people who fit these brakes would ever notice.

The beauty of the 7040 caliper is that the pads are half the price which makes a big difference in running costs , the retail price of DS2500's for each calipers are

7040 calipers £91.10
5570 calipers £179.97
5555 calipers £183.74

The 7040 calipers have much better dust sealing , the 5555 and 5570 caliper have a thin dust seal inside the caliper bore that stops any muck getting into the caliper body , the dust seals offer no protection for the pistons , I have reconditioned loads of caliper because the pistons have become either corroded , or pitted to such a state that they will not seal again when pushed back into the calipers when fitting new pads. And to change the pistons and seals your looking at about £200.

The 7040 caliper has outer seals fitted that also fit onto the pistons , so as the pistons come out as the pads wear , they are fully covered and protected from the elements , the pistons will never get damaged like the 5555 or 5570 one will.

People go on about the 5555 and 5570 calipers being much stiffer than the 7040's , if you look in the AP catologue , have a look at the thickness of them all , the outer half of the 7040 caliper is actually 7mm thicker than the 5570 caliper , and 3mm thinner than the 5555 caliper , and if anyone thinks that these calipers will flex before hoses expand , or bulkheads flex when your standing on the brakes , they dont really understand what is going on.

I have run the 7040 calipers on my own rally car in the past , and had no problems with seals melting ect , and the way they performed I could not fault them , so dont be put off by others slating them , they are great

Cheers Ian