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Author Topic: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)  (Read 5602 times)

cuttyman9

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Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« on: August 10, 2021, 12:32:29 AM »
Here is the IS300/Altezza rear dual BBK!
**also fits GS300 and GS400**

This is for all you drift nuts. Yes it’s overkill but I didn’t want some tiny stock calipers and mini rotors when you have my 6 pot front or 350phi’s 6 pot front so I ran with my existing design but added another caliper! I figure at ~50 a pair in most junkyards it’s hard to beat so here it is!

You'll need:

——————CALIPERS—————
02-10 VW Toureg
03-10 Porsche Cayenne
05-15 Audi Q7
(2x right, 2x left)

(I have found car-part.com is the cheapest place to search, its an annoying website but yields the cheapest prices outside of local junkyards)

PNs  20.7673.03 and 20.7673.04 (see pictures for the location)


—————-HARDWARE—————-

4x hex M12-1.75x25 (30mm will work as well)
(McmasterCarr.com PN 98093A746)

8x hex M14-1.5x30 (35mm long will work as well)
(or reuse the hardware from Cayenne/Toureg/Q7, Even though they are a bit long.)
(Mcmastercarr.com PN 91180A778)
 
———————-ROTORS—————-

2x 2008-2014 ISF rear brake rotor  PN PRT6106

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

For the hydro setup that will depend on what parts you use.



NOTE: Calipers will need to be modified but only slightly.
Depending on brand of pads clearancing the of pad “weights” might be needed.

I found this tool works very well for this little bit of clearancing and is pretty damn cheap!

https://www.harborfreight.com/power-tools/grinders-sanders/portable-belt-sanders/53-amp-12-in-heavy-duty-bandfile-belt-sander-62863.html

Their sanding belts are kinda shitty so prep for using a few.

Make sure all bleeders face upward and all crossovers are on the bottom.

Typically in normal calipers for braking you want the small pistons to hit the rotor first(so if you draw and arrow on the rotor of the rotation of it while the car goes forward the arrow should see small pistons first)

If you don’t have the pistons in the right direction for normal braking then they squeal upon light pedal pressure.


**You will remove the brake line cover and the rubber isolator and bend the brake line up and away from the rotor area.**


**the brake lines and bleeders need to be flipped as the small pistons are on the top and the big pistons are on the bottom.**
« Last Edit: December 19, 2021, 08:18:35 PM by cuttyman9 »
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #1 on: August 10, 2021, 12:37:06 AM »
This is the final result, it does require some machining on the forward calipers.
Do remember to confirm the small pistons touch the rotor first (in the rotational direction of the rotor if that makes sense)
« Last Edit: December 19, 2021, 08:22:45 PM by cuttyman9 »
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #2 on: August 10, 2021, 12:50:48 AM »
This is the small amount of clearancing needed to install these (over the existing clearancing of the 2 caliper setup)
This should only be required on the inside part of the forward calipers.
You should be able to reuse the factory Porsche hardware for the caliper attachment (do not reuse the cars hardware to attach the brackets to the knuckle!)
If you reuse the Porsche hardware you’ll need to clearance the knuckle to dodge the hardware(shown in another picture)


Start by bolting the forward caliper to the flat side of the bracket.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #3 on: August 10, 2021, 01:53:31 AM »
This is the small amount of clearancing needed to install these (over the existing clearancing of the 2 caliper setup)
This should only be required on the inside part of the forward calipers.
You should be able to reuse the factory Porsche hardware for the caliper attachment (do not reuse the cars hardware to attach the brackets to the knuckle!)
If you reuse the Porsche hardware you’ll need to clearance the knuckle to dodge the hardware(shown in another picture)


Start by bolting the forward caliper to the flat side of the bracket.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #4 on: August 10, 2021, 02:03:30 AM »
Small clearancing
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #5 on: August 10, 2021, 02:26:56 AM »
After the bracket is bolted in place
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

wrench_james

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #6 on: October 01, 2021, 09:14:28 PM »
How do we purchase these adaptor brackets?

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #7 on: December 19, 2021, 08:19:33 PM »
Shoot me a PM.
Sorry, I haven’t been checking a ton of the posts.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #8 on: February 07, 2022, 04:03:33 PM »
Clearancing upon install.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #9 on: February 07, 2022, 04:05:28 PM »
Little more clearancing.
It’s a tight fit putting these big calipers in the rear
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #10 on: May 11, 2023, 01:30:52 PM »
Thanks to Sergio for adding some pics.

The hardware listed helps to not require as much clearancing because the bolts are shorter (instead of reusing the hardware like I did in the mock up)
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

cuttyman9

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Re: Is300/gs300 dual rear caliper setup (drifting/hydro/etc)
« Reply #11 on: October 10, 2023, 11:46:30 AM »
************************DISCLAIMER*********************
 
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.
Founder of "Official 5th Gen Celica" on Facebook
92 Celica GT 2gr
99 F150 4.6/t56
71 Cutlass 350olds/tr6060
75 Trans Am 455pont/t56
67 Chevelle 5.0/t56
66 C20 LB 478 v6/s6 650
36 Chevy Master Coupe
71 Triumph Stag
91 300zx TT
92 Subaru SVX
92 Stealth RT/TT
88 Corolla GT-S
92 Typhoon

 

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