AP Sprint BBK - The cost/benefit review

[Sleepless]

Originally Posted by Pat

LOL $225. What a joke.

Yeah!

I use one of these at $50 and it works great: http://www.summitracing.com/parts/lil-29100

[DocWalt]

Originally Posted by Pat

LOL $225. What a joke.

Originally Posted by Sleepless

Yeah!

I use one of these at $38 and it works great: http://www.summitracing.com/parts/lil-25750

Yeah, it's expensive but worth it, IMO. I'd have linked the much cheaper Lisle but I have no personal experience with it and I'm not going to suggest someone to buy something that I don't have a clue about

I think I'll pick up one of the Lisle spreaders

[strat61caster]

This works well on the OE, the foot nestles into the piston nicely and spins freely so you're not scratching anything up. Not sure on the AP piston size, may make for an awkward fit but could always use a piece of wood like above.

http://www.harborfreight.com/disc-br...sor-68973.html

[IPGJames]

I just ordered in the Lisle quad piston one....i love my AP Brakes...i hate installing new or close to new thickness pads...a 15 minutes job takes an hour ...hopefully the Lisle spreader works well...will find out next week

i will spend the $225 in a heartbeat if it saves me 30 minutes of my life each time i do pads (i do them frequently between track and street)...we will see how the lisle one does first

[brzaapi]

These are my thoughts as well. It was easy enough to use a clamp and block the first time. But i also was only needing to move back the pistons about 2 mils. I imagine it will be quite different when i am i changing pads that are almost toast. If the pistons had been out anymore, my clamp likely wouldnt have cleared. So at the very least i need a different shaped clamp.

But these tools look good. I guess my caliper kit is obsolete, since it mainly worked with OEM slider bolt calipers.

Originally Posted by IPGJames

I just ordered in the Lisle quad piston one....i love my AP Brakes...i hate installing new or close to new thickness pads...a 15 minutes job takes an hour ...hopefully the Lisle spreader works well...will find out next week

i will spend the $225 in a heartbeat if it saves me 30 minutes of my life each time i do pads (i do them frequently between track and street)...we will see how the lisle one does first

[gatorac]

[ame="http://www.amazon.com/gp/product/B005GLQCKA?psc=1&redirect=true&ref_=oh_aui_detailp age_o02_s00I"]Amazon.com: Lisle 29100 Quick Quad Pad Spreader: Automotive[/ame]

I have also used a modified C clamp. Cut the fixed end off and weld on a flat piece. Works great. A little tricky on the back side because of the banjo bolt.

[gatorac]

Here's a pic of the homemade tool.

[zdr93523]

At 4000+ ft elevation in Utah we have much less cooling capacity for the engine and the brakes. My pads last about 8 time attack competition days with the AP kit which is twice as long as the stock, but nowhere near what you're seeing. The rotors have not cracked to the edge yet though. Despite the abbreviated pad life, pedal feel and consistency are amazing.

Likewise, the brake fluid (even RT700) needs to be bled about every 8 days, sometimes sooner, due to the reduced capacity for cooling up here.

[ansibe]

I'm curious about why pads would last longer with these calipers and discs.

With the same engine and tires, the energy going into the system should be about the same. The discs aren't heavier than OE, so they don't have more heat capacity. I guess it's all about airflow through the disc keeping the pads and discs cooler.

Any other ideas?

[DocWalt]

Pads are thicker too, so there's more mass to absorb the heat.

The BBK is a system, you have larger swept area (bigger pads and bigger rotors) meaning you get more torque from the pads which means they don't have to work as hard, there's a lot more airflow through the rotors, the pads are thicker, the calipers are bigger. Everything leads to a lot higher heat capacity meaning you're not at the ragged edge of durability like you are with the factory calipers/rotors.

[Falcon]

Originally Posted by ansibe

I'm curious about why pads would last longer with these calipers and discs.

With the same engine and tires, the energy going into the system should be about the same. The discs aren't heavier than OE, so they don't have more heat capacity. I guess it's all about airflow through the disc keeping the pads and discs cooler.

Any other ideas?

Discs arent heavier, but its a two-piece design.

So the actual rings are thicker and heavier than the OEM part of the disks.

You are right about the Airflow.

[Apex_BRZ]

Does anyone know if the AP kit will clear Enkei RPF1 17x7.5 wheels?

[JRitt]

Originally Posted by Apex_BRZ

Does anyone know if the AP kit will clear Enkei RPF1 17x7.5 wheels?

Here are all of the Enkei RPF1 fitments that our customers have told us will clear our Sprint Kit without a wheel spacer:

• Enkei RPF1 17x7.5 +48
• Enkei RPF1 17x8 +35
• Enkei RPF1 17x8 +42
• Enkei RPF1 17x8 45
• Enkei RPF1 (very tight fit, but works) 17x9 +35
• Enkei RPF1 18x9.5 +38

Thanks!

[ZionsWrath]

I have that Lisle caliper tool and it doesn't do jack shit on my AP kit. Works a treat on OEM sliding caliper. Doesn't budge the 4 piston AP.

I use a worn out pad, read old baxking plate. Stick it in the caliper and use a small pry bar to depress 2 pistons. Stick in the pad and thenn deprrws other side. Works flawless

Lisle is a decent product but not at all strong enough for the AP kit. Of it works for you i'd ask for advice and please post a video of you using it.