TWP AP Big Brake Kit

[tomwrigleyperformance]

So finally got round to finishing my AP big brake kits for the M2 / M3 / M4.

I've now installed them on my F80 M3 and over the moon with the results, I have also fitted a set of the 763m wheels which show the brakes off nicely.

Front Kit 390mm J Hook Discs With 6 Pot Caliper:










Rear kit 378mm J Hook Discs with 4 Pot Caliper:







Some of the savvy ones will notice I'm running slightly different calipers in the pictures when the wheels are fitted and that's because I now have a set of the 2018 Radi-CAL ll Calipers.

[Circuit Hunter]

Brakes, wheels, car = Money

Nice work!

This is the first F80 I've seen with 19" front and rear 763m's. They work well.

[M3SQRD]

Why use F/R 390/378 mm diameter rotors? This just adds unnecessary unsprung weight to each corner of the car.

How much do the F/R AP Radi-cal II street calipers weigh compared to stock calipers? Again, more unnecessary unsprung weight. The AP Radi-cal I street calipers have extremely limited pad options - which brake pad manufactures offer street and/or track pads for the AP Radi-cal II calipers?

BTW, I'm running the Essex/AP Radi-cal 5000R 9668/9449 calipers (drop forged, SS domed pistons, AKB springs, anti-rattle clips) with 372/365 mm j-hook rotors. This setup saves considerable weight per corner and larger diameter rotors are definitely unnecessary, even on the most demanding tracks on brakes. Also, a huge number of pad options are available for these calipers. Lastly, I bet your brake kit is more expensive considering kits using the Radi-cal I street calipers and 380/380 mm rotors is more expensive than the Essex/AP 5000R Radi-cal brake kits.

[F3IGHTY]

Originally Posted by M3SQRD

Why use F/R 390/378 mm diameter rotors? This just adds unnecessary unsprung weight to each corner of the car.

How much do the F/R AP Radi-cal II street calipers weigh compared to stock calipers? Again, more unnecessary unsprung weight. The AP Radi-cal I street calipers have extremely limited pad options - which brake pad manufactures offer street and/or track pads for the AP Radi-cal II calipers?

BTW, I'm running the Essex/AP Radi-cal 5000R 9668/9449 calipers (drop forged, SS domed pistons, AKB springs, anti-rattle clips) with 372/365 mm j-hook rotors. This setup saves considerable weight per corner and larger diameter rotors are definitely unnecessary, even on the most demanding tracks on brakes. Also, a huge number of pad options are available for these calipers. Lastly, I bet your brake kit is more expensive considering kits using the Radi-cal I street calipers and 380/380 mm rotors is more expensive than the Essex/AP 5000R Radi-cal brake kits.

take it easy - the guy just installed 'em

[M3SQRD]

Originally Posted by F3IGHTY

take it easy - the guy just installed 'em

Well, originally it was listed as a kit for sale, not just a newly installed kit. I couldn't resist

[tomwrigleyperformance]

Originally Posted by M3SQRD

Why use F/R 390/378 mm diameter rotors? This just adds unnecessary unsprung weight to each corner of the car.

How much do the F/R AP Radi-cal II street calipers weigh compared to stock calipers? Again, more unnecessary unsprung weight. The AP Radi-cal I street calipers have extremely limited pad options - which brake pad manufactures offer street and/or track pads for the AP Radi-cal II calipers?

BTW, I'm running the Essex/AP Radi-cal 5000R 9668/9449 calipers (drop forged, SS domed pistons, AKB springs, anti-rattle clips) with 372/365 mm j-hook rotors. This setup saves considerable weight per corner and larger diameter rotors are definitely unnecessary, even on the most demanding tracks on brakes. Also, a huge number of pad options are available for these calipers. Lastly, I bet your brake kit is more expensive considering kits using the Radi-cal I street calipers and 380/380 mm rotors is more expensive than the Essex/AP 5000R Radi-cal brake kits.

Chuffed for you 👍

[M3SQRD]

Originally Posted by tomwrigleyperformance

Chuffed for you 👍

What about the added weight of your front and rear kits compared to stock? Why use F/R 390/378 mm diameter rotors? What about pad options available for the Radi-cal II street calipers (i.e., what are the pad shapes)? What are the piston sizes on the F and R calipers? These are questions anyone interested in purchasing a brake kit would want answered.

[tomwrigleyperformance]

Originally Posted by M3SQRD

What about the added weight of your front and rear kits compared to stock? Why use F/R 390/378 mm diameter rotors? What about pad options available for the Radi-cal II street calipers (i.e., what are the pad shapes)? What are the piston sizes on the F and R calipers? These are questions anyone interested in purchasing a brake kit would want answered.

Ok well firstly the the CP9665 and CP9449 Calipers used in your kit are a race caliper and are not recommended for use on the road as they don't have the correct seals for this use. They are a lovely caliper and very light but as AP states they are not for road use, My kits are for road and track hence why I don't use these calipers.

The whole point of my big brake kit is too offer a larger brake discs and calipers than stock hence why I use larger discs in my kits so I'm not quite sure why anyone would spend the money on a kit which has smaller discs than OEM? However I do off an 18 inch kit which is designed to fit under 18 inch wheels for those who run slick on their cars. I cant seem to find Genuine AP discs in the sizes in your kit either so not to sure what they.

Pads wise I can offer DS2500 pads which work perfectly for fast road and the odd track day or DS3000 for people looking for a more track focused pad.

[M3SQRD]

Originally Posted by tomwrigleyperformance

Ok well firstly the the CP9665 and CP9449 Calipers used in your kit are a race caliper and are not recommended for use on the road as they don't have the correct seals for this use. They are a lovely caliper and very light but as AP states they are not for road use, My kits are for road and track hence why I don't use these calipers.

The whole point of my big brake kit is too offer a larger brake discs and calipers than stock hence why I use larger discs in my kits so I'm not quite sure why anyone would spend the money on a kit which has smaller discs than OEM? However I do off an 18 inch kit which is designed to fit under 18 inch wheels for those who run slick on their cars. I cant seem to find Genuine AP discs in the sizes in your kit either so not to sure what they.

Pads wise I can offer DS2500 pads which work perfectly for fast road and the odd track day or DS3000 for people looking for a more track focused pad.

Ok so now I understand - you're in the camp that larger is obviously better, correct? So a 390 mm diameter rotor is needed for the street? I suppose if you're trying to impress people at a C&C. What happens to the rubber dust seals on your street caliper after track use? Yes, I'm using a kit that uses a rotor that has a smaller diameter than stock yet is thicker and has hugely improved cooling (84 unobstructed vanes) so overheating on track is a non-issue which shows a larger rotor is NOT required. Furthermore, reducing unsprung weight, especially on rotating components, has additional benefits.

So two pad compounds from the same manufacturer are all that's available? Not much to choose from considering pad choice is a personal preference.

What about a comparison of rotor (with hat and mounting hardware) and caliper (with brackets) weights?

[shay2nak]

bump

weight savings info?

[shay2nak]

Looks like the front caliper is 9.9 lbs, rear is 7.2 lbs
the rotors not sure yet. Well, the 390mm for GT-R is 27 lbs.

So over the stock brakes, these would basically weigh the same more or less. Not what I'm after. I was hoping to drop like 20 lbs with a brake kit. I should have ordered my car with CCB. I kept flip-flopping and would have added $100/mo to my payment. Now i have to pay like $3k more for the kit. 18 lbs weight savings over standard brakes as weighed by M2 doing the CCB conversion. Only thing with those I wonder if a lighter caliper could be swapped out with the stock ones.

The Essex kit saves a lot of weight, but the rotors are smaller size. Just read a M2C that did the conversion with sport brake kit and dropped over 40lbs.