No, because you are still dealing with a finite clamping force which both pairs of brakes can achieve in the same period of time if not the 4pots having less pistons to move so it happens quicker. The 4pots do react slightly faster IMO.

In fact, the 4 pots will likely lock the brakes up faster if we are talking about track type pads that need heat in them. The smaller pad surface area + smaller rotor will build heat faster and more heat = more friction. Good for short term like the case you mention, not so great for long sessions on track.

However locking the brakes up doesn't necessarily mean you will stop faster either though.

 

I'm seeing people kept mentioning locking the brakes. Yes, I agree when locking the brakes; it doesn't matter how many pots you have, more pots don't make the car stops faster. I have my car for 4years and never once locked my brakes. My question is... If you apply the same pressure to both 4 pots and 6pots without locking the brakes, do they stop at the same distance?

 

Just use the front calipers. The 7tt rear calipers have larger volume than the 6tt calipers. You can use the 7tt rotors front and rear, but for the rear, you need spacers and longer bolts to mount the 6tt calipers with the 7tt rotors.

 

They're great. No difference in brake feel but the longevity is much better, plus with the re-usable hats, replacement rotors are very reasonable. Of course going from PCCB's to iron rotors will probably feel different to you.

 

If anything the 4 piston brakes will stop faster because they will generate heat faster from being cold. The pedal pressure you put on the 6 piston is being spread over a larger area with the same amount of pressure going through the lines, so even though there are two less pistons on each side the ones that are there are pressing harder at any given brake pedal location.

 

I understand your theory heavychevy. However, for example, three people (3 pots on each side) pushing a car is always easier than two people pushing a car. You don’t need the same energy per person to get the job done. If you apply the same pressure, it doesn’t matter if it is 4 pots or 6 pots, the pressure will be the same inside the lines and the whole brake system. The same force pushing 6 pistons should have better results than pushing 4. And it makes the driver's job easier because it requires less force to get the job done. I’m not trying to argue, but this is how I look at it.

 

Heavy, while I see your logic in quicker heat more friction, isn't there a downside since brake cooling is essential for track cars, especially heavy ones like 996TT's? If the brakes heat up quicker than means they will be heated for longer, thus putting more heat in the fluid, pads, and rotors. Seems to me the larger pads and rotors are more heat resistant and/or quicker heat shedding, whichever the case may be, therefore more efficient. I know there is some unsprung weight trade off with the larger set-up.

 

Yes, read my post before my last one, I stated that it's good for the situation he mentioned, which is a sudden stop on the street, but not good for long runs on the track. You are correct and I agree.



Yes, but we are talking about 2 people pushing as hard as the other 3 people combined. And the 3 people have more resistance, and their energy is spread out over more space.

It's like a water hose, you have the same water pressure. Having two spray openings instead of one will not make the force of the water stronger, it will make it weaker because now the energy is spread out over more openings.

Using the same pressure to press 4 pistons rather than 6 means the 4 pistons are pushing harder at any given pressure than the 6 pistons because both have the same amount of energy supplied to them. At any given pedal location the 4 pistons are working harder to get the same job done, not the driver.

 

[quote=heavychevy;3196676]Yes, read my post before my last one, I stated that it's good for the situation he mentioned, which is a sudden stop on the street, but not good for long runs on the track. You are correct and I agree.[quote]

Sorry, I missed that.

 

Thank you for taking time to explain this heavychevy; it is just hard to believe the two-piston brakes on my old Lexus are more "efficient" than my 6TT on street driving.

 

That's what i thought but some people say i can use the rear caliper as well. same size master cyclinder?

thanks
Adrian

 

The master cylinder is the correct size for the upgrade. The rear calipers need the spacer that some sponsor is selling but I can't remember who that is. Someone will chime in.

 

From what I know, it is the same master cylinder size for 6GT2/3 and 6tt, but is different than the 7 series.

The volume is the same for the front calipers, but not for the rear between 6tt & 7tt. My suggestion is to stick with the 6tt rear calipers, use caliper spacers and 7tt bolts when using the 7tt rotors.

I just purchased my Giro Disc rotors for the rear in 7tt size from SharkWerks and they included spacers and bolts to adapt the 6tt calipers to the 7tt rotors.

Alex, James and Dan are great to work with and can get you the right components.

 

On the RF650 you are looking at 328C/622F dry boiling point and 218C/424F wet boiling point. The fluid is not compatible with SRF fluids so you need to do a complete flush. The price on the MX20 pads is $600 for the front axle and $350 for the rear.

 

Automotive-WOW what does $950 cover here?