AP racing Radi-CAL 2 calipers?

[Slippydiff]

The Wookie said:

Slippydiff said:

The E46 M3 CSL & V10 M5/6 were prime examples, the E9X (and thus the 1M Coupe) were similarly hamstrung by questionable OE brakes.

Good example of a car where the OEM brakes really are pants and worth an upgrade. On my E92 I went from a baggy pedal that would fade and start juddering after a few laps of most track to being able to pound round all day without a hint of fade

Some proper stoppers you’ve got fitted there
The standard stuff is unforgivable.
The 378mm AP’s I fitted on the front of the 1M Coupe were a game changer. I was shocked by the weight of the OE calipers, caliper mounts and the discs.

The previously slightly overly stiff front suspension that had formerly hammered over cats eyes, now floated over them instead. The steering was lighter, more feelsome and the turn in considerably more aggressive, all of which drastically increased my confidence in the car’s abilities on bumpy high speed corners.
As mentioned previously, the performance of the brakes themselves was absolutely mind boggling.

[anonymous-user]

Slippydiff said:

m.barnes said:

Anyone got these? The performance versions (particularly the CP9560)

https://apracing.com/performance-upgrades/performa...

Thinking of upgrading the brakes on my v8 vantage which has the 4pot front calipers. It’s a “cheaper” option than the OE 6 pot brembo and I believe they are a “better” caliper but that’s a grey line.

Anyone using them?
Looked at the more race version too but this is more a road car than a track car just looking at upgrading the calipers as need new discs and pads anyway.

Thanks

I made my recommendations to another PH'er with regards to the Radi Cal 2 calipers here previously :

https://www.pistonheads.com/gassing/topic.asp?h=0&...

Give David at BG a ring, he'll sort you out

Hey Slippydiff, hope you are well. Can I just say - three years down the line - the upgrade provided by Dave at BG has probably been the single most rewarding upgrade I've done to the car. I use it hard, lots of tracks and tours, and the confidence provided by those brakes has been allowed me to push so much harder and longer. Great recommendation - cheers, Ian.

[Slippydiff]

thecook101 said:

Hey Slippydiff, hope you are well. Can I just say - three years down the line - the upgrade provided by Dave at BG has probably been the single most rewarding upgrade I've done to the car. I use it hard, lots of tracks and tours, and the confidence provided by those brakes has been allowed me to push so much harder and longer. Great recommendation - cheers, Ian.

Hi Ian, I hope you're well ?
So glad to hear the BGD brake set up continues to please. Sometimes bigger isn't better, but when it comes to brakes on a performance car, mass is everything, and those 390mm discs certainly have mass !!
Glad to hear and see (from the small video clip you posted elsewhere on PH) you're still enjoying the car.

[m.barnes]

Thanks. In the end the weight and lack of many reviews etc put me off buying these. I have upgraded instead to the brembo 6 pots from the Aston Vantage V8S and have gone for 2 piece Jhook discs.

The Radical calipers just seemed too heavy to warrant.

[ATM]

m.barnes said:

Thanks. In the end the weight and lack of many reviews etc put me off buying these. I have upgraded instead to the brembo 6 pots from the Aston Vantage V8S and have gone for 2 piece Jhook discs.

The Radical calipers just seemed too heavy to warrant.

I'm not sure if you should get so hung up on the weight of the caliper itself. The weight of the rotational parts is much more important. It is these which will sap power if heavy and make braking harder. Lighter rotational parts - the disc itself and the wheel and the tyre etc - will both improve acceleration and deceleration or braking. A heavier brake caliper will only alter the unsprung mass which gives the suspension more to do or more weight to handle.

[m.barnes]

completely agree. The two piece discs should help with rotational weight and are the same ones Id have got if I opted for the Ap radicals.

There was also just a niggle about going "non OEM" on the aston. Great to see it done on a ferrari! Maybe next time!

[Slippydiff]

ATM said:

m.barnes said:

Thanks. In the end the weight and lack of many reviews etc put me off buying these. I have upgraded instead to the brembo 6 pots from the Aston Vantage V8S and have gone for 2 piece Jhook discs.

The Radical calipers just seemed too heavy to warrant.

I'm not sure if you should get so hung up on the weight of the caliper itself. The weight of the rotational parts is much more important. It is these which will sap power if heavy and make braking harder. Lighter rotational parts - the disc itself and the wheel and the tyre etc - will both improve acceleration and deceleration or braking. A heavier brake caliper will only alter the unsprung mass which gives the suspension more to do or more weight to handle.

This ^
The caliper mass is pretty immaterial when you consider the combined weight of the rotating components such as disc, bell, wheel and tyre ...