Essex/AP Racing Sprint Kit proven in endurance racing by Toyota engineers

[JRitt]

Hey Guys,


I wanted to share a post we just published on our Essex Blog. We've heard some chatter by competitors over the years about what our Essex Designed AP Racing Sprint Brake Kit can't do: "It's too small/lightweight, you need a rear kit, the discs won't last, etc." We're here to tell you again that is pure nonsense. A group of Toyota engineers from their Arizona proving grounds contacted us last summer about helping with the brakes on their 86 racecar. They installed and pummeled our Sprint Kit in the NASA Western Endurance Racing Championship, in which a typical race would be four hours long. They were even on track to run the entire 25 Hours of Thunderhill on one set of pads, but an unfortunate failure (unrelated to brakes) ended their race early. They sealed up the 2018 championship with our kit, and provided some great feedback along the way.

"I’d like to start by saying thank you and Essex/AP Racing for your extremely generous and strong support of our team. The Sprint Kit was a game changer in terms of getting the high quality aftermarket braking capacity we were looking for. Our team is reaching new peaks for; team participation and engagement, on track performance, race wins, preparation, and professional appearance for the car and crew. Essex’s/AP Racing’s support directly and indirectly contributes to all of these areas, and we can’t thank you enough.

Technical Feedback on AP Sprint Kit

Technical Feedback on AP Sprint Kit The AP Sprint Kit has worked flawlessly since we installed it prior to Sonoma. I’ll admit to having pretty high expectations for the AP kit prior to the event, and we were not disappointed in any way! Everything worked exactly as it should, no integration issues with the ABS, and front/rear balance was very nice. Also appreciated the solid and very consistent pedal, definitely has significantly improved feedback over the stock calipers. Brake pad wear has also been greatly improved, I’d safely estimate 100% increase in pad wear rate over the same compound with stock brakes. Phenomenal! While we did prepare for a brake bad change during the 25hr, all indications were that it was not going to be necessary. This is exactly the type of performance and durability improvement we were hoping for when we chose to go with Essex/AP Racing. We’re looking to continue try and find the limit of the system in 2019! Please enjoy some photos from the weekend below, and feel free to follow us on Instagram @tapgmotorsports. Thank you!"

Check out the full story and see more pics on our blog. Thanks!

[2Wavy]

Cool! A couple questions though, are they just running stock oem rotors in the rear? Also how are they fitting RPF1s over the Sprint kit, I thought they had insufficient clearance?

[JRitt]

Originally Posted by 2Wavy

Cool! A couple questions though, are they just running stock oem rotors in the rear? Also how are they fitting RPF1s over the Sprint kit, I thought they had insufficient clearance?

To our knowledge, yes they are just running OEM rear discs. There are at least six different variants of the RPF1 fit over our Sprint Kit without a spacer (bold red below). Wheel fitment data from our website:


Confirmed wheels that fit our Essex/AP Sprint Kit without a spacer:

• 949 Racing 6UL 17x8 +40
• Advan GT 18x9.5 +40 (So much clearance! 1.2+in)
• Data R1R 17x8.5 +35
• Enkei NT03+M 17x7.5 +35
• Enkei PF01 17x8 +45
• Enkei Raijin 18x8 +45
• Enkei Raijin 18x8.5 +45
• 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
• Enkei Fujin 17x7.5 40
• Kosei K4R 17x8 36
• Mach V Motorsports "Awesome" wheel 17x9 42
• OZ Ultraleggra 17x8
• OZ Ultraleggera 17x8 +48
• Prodrive GC010E 17x7.5 +38
• Racing Hart CP035 17x7.5 ET48 (very tight 1mm clearance)
• Rays CE28N 18x7.5 47
• Rays Gramlights 57DR 17x9+35
• Ray's Gramlights 57DR 17x9 +38
• Rays Gram Lights 57Xtreme17x9 +40
• Rota Titan 17x8 +40
• Rota Titans confirm 17x9 +42
• Sparco Terra 16x7 +50
• Sparco (designed by OZ) Assetto Gara 17x7.5 48
• SSR GTF01 18x8.5 +44
• SSR GTV02 18x9.5 +40
• SSR Type C 16x7.5 +35
• Subaru OEM STI Wheels (2004) 17x7.5 53
• Subaru OEM BBS STI Wheels from 2016 Series.Hyperblue
• Team Dynamic 1.2 17x7 38
• Team Dynamics Pro Race 1.2 17x8 +38
• TSW Bathhurst 17x8 +35
• TSW T66F 17 x 8.0 +42
• TSW T66F 18x8.5 +44
• TSW Nurburgrings 17x8 +45
• Volk CE28N 16x8 +42
• Volk CE28N 17X7.5 +35
• Volk CE28n 17x7.5 +50
• Volk CE28N 17x8.0 +44
• Volk CE28RT 18X9.5 +38
• Volk CE28RT 18X9 +43
• Volk Racing RE30CS2 18x9.5 +40 (About 0.5-0.7in of clearance!)
• Volk Racing TE37RT 17x9.5 +40
• Volk se37k 17x7.5 +48
• Volk se37k 17x8 +35
• Volk Racing TE37 16" x 7 +46
• Volk TE37 17x8 +35
• Volk TE37SL 17x9.5 +45
• Volk Trophy 18x8.5 +42
• Volk Racing ZE40 18x10" +40
• Wedsport sa67 18x9 +36
• Wedsport TC105n 17x9 35
• Wedsport TC105n 17x8 +42
• 18" Work Meister S1R O-disk (O disk is least clearance disk, so A/R/T will fit as well)
• Work Ultimates 18x8.5 +47
• Work Meister S1R 17” with at least an A centre disc
• XXR 17x8.25 +35

The wheels below will fit with a spacer of the specified thickness:

• 2013+ USDM OEM BRZ or FR-S front wheels, 10mm spacer
• OEM NZDM Gt86 (by enkei)16x6.5 +48, needs at least 8mm spacer
• BBS RK 17x7 +48, needs 10mm spacer
• SSR type-c 16x7 +48, needs 5mm spacer
• Volk Racing TE37 18x7.5 +48, needs 5mm spacer
• Volk TE37 17x7.5 +48, needs 3mm spacer
• Watanabe Needs15x6 +35, needs 25mm spacer

How to use the wheel fitment template:

[jacobe38]

rpf1 17x9 +35 absolutely does not clear my good sir or madam.

i bought them based off this thread and then had to install extended studs and buy 8mm spacers.

[Breezio]

Originally Posted by jacobe38

rpf1 17x9 +35 absolutely does not clear my good sir or madam.

i bought them based off this thread and then had to install extended studs and buy 8mm spacers.

I know at least one person running the Sprints and 17x9 +35 rpf1s without spacers...

Per idea from my friend. Wondering if perhaps you ordered the 2022+ kit, which has a different bracket and rotor. Might make the rpf1s not fit anymore.

[RedReplicant]

Indeed, sounds like there was a kit revision as I also have a friend with the original kit on 17x9 +35 RPF1

Also, fun to see the TAPG car again

[ArCha]

The fitment templates they have on their website show the 2022 kit being about 8mm more outward than the older kit. I bought RPF1s in 18x9.5 and the 2022 kit not realizing they were that different and thinking I was being smart, it didn't work out. 8mm spacer looks right when I took rough measurements too.

[blsfrs]

Maybe this topic has been covered before. I'm considering the AP sprint kit for my 2013 FRS. The car sees 2-3 track weekend per season.

I know there is no such thing as a street/track pad. If I want to switch pads at the track (or before I go to the track), what sets of pads would be recommended to avoid possible bedding issues?

[Ohio Enthusiast]

I know at least Carbotech/G-Loc and Ferodo have compatible street and track pads that they claim can share rotors and don't require bedding in between pads (1521/XP10+, GS-1/R10+, DS2500/DS1.11/DS3.12). I'm sure other brake manufacturers have similar options.

I run separate rotors as well, though, and swap at home before the track, so the drive to the track and back is on track pads. It's not ideal, but unless you go really extreme on the pads you shouldn't have more issues than a lot of brake dust and slightly increased wear.

[blsfrs]

Originally Posted by Ohio Enthusiast

I know at least Carbotech/G-Loc and Ferodo have compatible street and track pads that they claim can share rotors and don't require bedding in between pads (1521/XP10+, GS-1/R10+, DS2500/DS1.11/DS3.12). I'm sure other brake manufacturers have similar options.

I run separate rotors as well, though, and swap at home before the track, so the drive to the track and back is on track pads. It's not ideal, but unless you go really extreme on the pads you shouldn't have more issues than a lot of brake dust and slightly increased wear.

Thanks. I've been told that with the Carbotech xp's no new bedding was required. In the past, I just left the track pads on for the season (cringe) and put street pads on for the off season.

My wife tells me our dog recognizes the squeak of my car when I'm approaching the house.

[Ohio Enthusiast]

Originally Posted by blsfrs

In the past, I just left the track pads on for the season (cringe) and put street pads on for the off season.

My wife tells me our dog recognizes the squeak of my car when I'm approaching the house.

I try to bunch up my track days for that reason - leave the track pads and rotors on for a few weeks and street them in between HPDEs. My daughter calls it "bus brakes".

[autoracer86]

I know people who daily the ds1.11 so you could probably get away with that for street and track.

I’m currently pad swapping at each track day and even though it doesn’t take that long and I have help I would like to stop. So if I go bbk I’m going to give the ds1.11 a shot. Funny I won’t get to really experience how easy it is to swap pads on a bbk if I’m only running one pad lol