how does adding bias to the rear affect the car ?

 

I did them same except 350mm Giro/PFC - great pads, with better braking capabilities your driving level increases and you start pushing it harder, at Homestead earlier this year first session last cool down lap coming into pit lane my driver's side caliper bolts pulled out (stripped) causing it to dig into the rim locking up. Could not of imagined if it had happen going all out. I had my guy replace the bolts with studs and so far so good. Keep an eye on them.

 

More rear bias works as follows:

1) You use the rear brakes more. More energy is dissipated into the rear system than before. The rear brakes get hotter, the front brakes get cooler.

2) You use the rear tires more. The rear tires have less lateral force capability, because you're using more of their longitudinal capability. So if you have to turn quickly while braking hard, you'll get closer to losing grip at the rear than you would be before.

3) You use the front tires less. Opposite of #2.

That's a really high level overview of the effects. In the real world, lots of other factors come into play, especially your driving style and differential setup, not to mention ABS/EBD/PSM.

 

I would like a little more rear brake bias on my car. Would going with a more aggressive pad in the rear vs front accomplish this?

 

Yes it would -

Many things affect brake bias - lots of misinformation here.

the spacer for going from 330mm to 350mm is typically 12mm

If you change both rotors (front and rear) your bias should not change (The lever action would be the same front/rear)

Where you gain on going with a bigger rotor is the thermal capacity - more thermal capacity means less heat transferred to the pads which are transferred to the calipers which are transferred to the fluid - which if too high - boils - then you get squishy brakes and brown spots on your seats...

 

You also get more brake torque from the increased leverage of the 175mm radius (350mm dia.) versus the 165mm radius (330mm dia.).

Later, Steve

 

The 911 turbo really could use way more rear bias then the stock set-up, I run a more aggressive pad in the back then I do in the front.


Going to the larger rotors is not a bad thing at all, it does not gain you heeps, but it does not hurt you in any way either.


I say pick another bracket kit other then the AP one due to Agency Showers un-ethical business practices. <-- Just my opinion, many other people say the same thing but you choose in the end.


Someone bumped a 5 year old thread just to take us down memory lane.
Mmmmm Brakes!

 

I have done this kit. It's ok not worth it in my book. Go with a big brake kit.

 

I did the 350mm rotor with spacer upgrade a while ago and was very happy with the results.

I was then lucky enough to come across a good used set of 997 Turbo brakes and had them put on, they look great, but if I needed them I dont know.

The stock calipers with 350mm discs and good set of ceramic pads were more than sufficent for my needs.

 

Tim are the stock 997 turbo rotors two piece or one piece?

 

One piece iron..

 

Stock calipers, spacers and 350mm rotors works fantastic and is all the braking 99% of guys well ever need.

Sean (srm engineering) and I are making a run of the spacers for a very affordable price here in the next week or so. If you need some give me your Sean a shout and we can add you to the list.

 

One piece rotors, Great upgrade, no need to spend extra money on things that are not needed but often spruiked here as if they were.

You will need spacers however, ask freddy about them, as they are getting hard to find.