My Community

Members => General Discussion => Topic started by: cuttyman9 on March 29, 2021, 10:47:55 PM

Title: Long awaited GS300 BBK
Post by: cuttyman9 on March 29, 2021, 10:47:55 PM
For everyone interested in my GS300/GS400/GS430/Aristo BBK
(I believe 93-04, it痴 very possible supras and sc300/soarers will fit but before I claim it someone will have to confirm)

You'll need:

02-10 VW Toureg
03-10 Porsche Cayenne
05-15 Audi Q7

NOTE: I have found is the cheapest place to search(60 per caliper) It痴 an annoying website but yields the cheapest prices outside of local junkyards which are the cheapest (25 per caliper)

The calipers should say 17ZL and 17ZR (it痴 come to my attention most parts stores show the rotor size, 330mm instead of 17z so tell them 330mm is the caliper you need lol)
PNs 20.8432.06 and 20.8432.05 (see pictures)
(use these numbers to confirm, there are many calipers that look similar but wont work)

4x M12-1.75x30 ( PN 90128A297 - Socket cap style bolt or equivalent)

4x SCH M16-1.5x40 caliper bolts
(or reuse the hardware from Cayenne/Toureg/Q7 on the top bolt hole, the lower holes are too close to other things)
( PN 96144A330)

8x  Fastenal PN 0136087 or  1245L from ace hardware
 (~2.5mm thick)

30mm Roll Center Adjusters (RCA)
(available soon for $150)
Rotor specs should be 356x30mm- confirm that before ordering as there are many that are 334 which will not work.

1x 2013-2018 GS350 F sport rotor-121.44204 front iron brake rotor (Centric PN shown)

1x 2013-2018 GS350 F sport rotor-121.44205 front iron brake rotor (Centric PN shown)

**These are not gsf rotors. Is350 f sport do not work either.
Only gs350 F sport.**

For drilled and slotted use this link, make sure to request only fronts (courtesy of Kirk smith)

Stock brake lines can be used although I would recommend getting stainless braided lines as it improves feel vastly.

Make sure to take the crossover lines and bleeders off and switch sides with them (because the cayenne/q7/Touareg have the caliper on the front of the knuckle and the is300 has them on the rear of the knuckle)

NOTE: Calipers will need to be modified
See pictures in later posts.

NOTE: The Washers will go between the bracket and the caliper.

18z calipers WILL NOT WORK (without custom pads and more clearancing on the back but none for the rotor)

The OEM tie rod/ball joint fits it better.

If you purchased calipers bare the hardware to mount the pads can be had here:
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 20, 2021, 06:25:00 PM
Here are a few pictures of the clearancing needed to fit these to a GS300.

Due to the unusual tie rod mounting on the same side as the caliper it takes a little bit of work to make this happen but it痴 a budget friendly setup.

Do note that some of the clearancing on this specific caliper was setup for the is300(friend of mine had an IS and decided to switch to GS and the clearancing isn稚 the same) the cnc machining is the IS300 and the grinder part is for the GS)

Something also different about GS vs IS is the edges near the bolt holes need to be clearanced on the lower part of the caliper to clear the knuckle.(picture of red caliper)
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 20, 2021, 06:30:10 PM
Closer looks at the two spots specific to the GS.
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 20, 2021, 06:36:30 PM
This shows the clearancing on the lower bolt hole of the caliper

The next picture shows the differences between calipers after clearancing has been performed.
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 20, 2021, 06:38:21 PM
Here痴 a couple of measurements to show about how much is removed from the radial area of the caliper.
These suckers are so thick there痴 still a ton of meat there.
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 20, 2021, 06:40:05 PM
This is the rough thickness of the washers.
The least amount of washers means less clearancing on the backside.

Some have used enough to center the caliper, this is how many I installed upon mockup.
Title: Re: Long awaited GS300 BBK
Post by: cuttyman9 on April 21, 2021, 09:02:47 AM

The person that is purchasing this product makes the following representations and acknowledges and agrees to the following terms and conditions:
This off-road race only product ("this Product") is designed and intended for use in organized, amateur and professional racing events, but is limited to closed-course racing and open-course racing that is formally sanctioned by a recognized racing organization involving the motor vehicle in which it is installed (the "Vehicle"). It is not for use on public highways or roads nor is it for recreational off-road use other than solely for competition purposes. The person or entity buying this Product and/or using this Product (the "User") agrees to use the Vehicle solely for competition uses as described herein.
The User accepting this disclaimer acknowledges and hereby indemnifies and saves harmless Overkill Engineering, its officers, employees, agents, distributors and dealers for any damages, penalties, fines, expenses or other costs which may arise from the use of this Product and without limiting the generality of the foregoing specifically acknowledges the following:
   Use of this Product for purposes other than solely for competition is a violation of federal law and may violate applicable state or local environmental, motor vehicle and other laws. The User warrants that this Product shall only be used in sanctioned closed-circuit events.
-That use of this Product may violate warranties from the manufacturer of the Vehicle or from others.
-That use of this Product may make the Vehicle unfit or unsafe for the purposes intended or for any purpose and cause personal injury, property damage or death.
-That the installation of this Product, improper installation of this Product, use of this Product with other components or failure to use this Product in conjunction with other components, could result in or cause personal injury, property damage or death.