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#43 |
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What about the new brake kit that's coming out for the 2017 Performance Package?
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#44 | |
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#45 | |
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#46 | |
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Let's say at 30mph, your tires are capable of stopping you at a rate of 1g before ABS engages with a brake torque value of 1000. Lets say OEM brakes are capable of a brake torque value of 1200 so you are able to hit peak stopping rate of 1g and engage ABS at this speed. You can go from 30 to 0 in say 50 ft. Now at 60mph, there is additional aerodynamic downforce on the tires increasing stopping rate to say 1.2g. Beyond this, at faster speeds, you have to dissipate more kinetic energy so additional brake torque is required to hit even 1g stopping force so now the required brake torque value might be 1500 to reach the peak 1.2g stopping force. Now the OEM brakes aren't able to hit peak stopping power right away and you aren't slowing down as fast as your tires are capable of but as you slow down, you'll eventually reach peak stopping power and fall into ABS. You can go from 60-0 in about 125 ft. You have still engaged ABS but maybe not right away so this is why saying "if you hit ABS, you cannot stop any sooner" is wrong. In this case, increasing brake torque WILL shorten your stopping distances because now you can hit the maximum stopping force sooner and bring your stopping distance from 60-0 down to 100ft. Again, please do not get hung up on the numbers I used, they were pulled out of my ass just to illustrate my point. |
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#47 | |
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#48 |
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I'll keep the Hawk ceramic pads for street use and I'm going to pick up some Carbotech X10's for the track. I've been looking at lots of BBKs around and I think the Essex sprint kits look like the best option. The wilwood kit is super affordable but apparently throws off the brake balance a lot unless you also do the rears which is overkill for me. I wont be going with a BBK for a while so I'll be able to save up for the Essex stuff.
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#49 | |
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But.......two points I would like to make with regards to your explanation. 1/ Regardless of braking force one cannot brake any more once the wheels have locked. That is, tyres are still the limiting factor. 2/ I am suggesting most street cars, the FRS/86/BRZ included, don't make downforce as standard, it is usually lift. I will find Velox's thread later.
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#50 | |
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But first it's worth to go to track few times with everything stock and check how car behaves now and what/if you want to change at all (for me after few trackdays there was wish to dial out some understeer) and feel if changes (preferably one at a time) worked right. Don't spend a dime (except maybe better pads & fluid) on anything before you feel how car behaves now and what/if you want to change at all. BTW, for cheap grip adjustment/enhancing can be got by simply deflating tires. I wouldn't want that as permanent solution though, as it increases tire wear, at some extent lessens turn-in sharpness, adds extra hassle to reinflate after trackday. LOL, and back to topic - think of BBK only when you are through first set of pads ![]() Remember, there is one bit that will make you driving faster on track most - learning & seat time with upgrade of nut behind the wheel ![]() ![]() |
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#51 | |
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I'll just add the LCAs and camber bolts to my wishlist. I'll set a goal of 4 or 5 track days before I do any more upgrades. I have a catback, CAI, and some aesthetic parts coming in the next few days, I just couldn't help myself... ![]() |
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#52 | |
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I will concede that I may have been mistaken when referring to downforce in relation to our cars because I was thinking of F1 cars when I said that. That said, the other major factor still counts in that more torque is required to reach maximum stopping force at 60mph vs 30mph so upgrading brake systems can still help reduce stopping distances even if you are into ABS during a stop. |
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#53 |
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As said above, you can apply more braking force when the wheels are spinning faster before locking up than at slower speeds. This was the 1st thing I was taught on a driver training day at Millbrook and spent time just braking to a stop from various speeds, engaging ABS and then finding the limit of engagement.
@nikitopo if you're suggesting that BBKs are fitted to provide more brake torque, then you'd only be able to fit those as part of a whole system change. Fitting just fronts/rears without any other changes would really throw off the balance and then you'd also need to consider a master cylinder change too as, for more braking torque through the pistons, you'd need to be moving more fluid.
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#54 |
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It's immediately noticeable under any sort of hard braking/panic brake situation.
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#55 |
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#56 | |
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