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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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 Posted: Sat Mar 13, 2010 11:03 am Post subject: |
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| OhChit wrote: |
Hey Guys..
Any updates on this conversion yet. I'm just about ready to upgrade my brakes and B-4 i spend the bucks on the typical Big Brake Kit, I'd like to know whats available so I can try to reuse my pretty Boxter Stoppers, but with the VW 5x112 lug patern. Trying to save my Mercedes wheels.
Does anyone have these type brakes on their rig yet and on the road. How do they stop, compared to the big brake kits? Will the hassel of install be worth it? |
Buildyourown links to my post I submitted a couple weeks ago. The bracket is done and I've been running them for about 12 days now. The improvement is staggering, even with the stock drums. I don't have time right now to go into detail, but I'll post more later when I get back from the hospital. Or send me a PM if you have any specific questions.
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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buildyourown
Samba Member
Joined: March 01, 2009
Posts: 1668
Location: Seattle
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240Gordy
Samba Member
Joined: May 15, 2008
Posts: 2354
Location: Vancouver, BC
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| Posted: Fri Mar 12, 2010 5:56 pm Post subject: |
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| OhChit wrote: |
Hey Guys..
Any updates on this conversion yet. I'm just about ready to upgrade my brakes and B-4 i spend the bucks on the typical Big Brake Kit, I'd like to know whats available so I can try to reuse my pretty Boxter Stoppers, but with the VW 5x112 lug patern. Trying to save my Mercedes wheels.
Does anyone have these type brakes on their rig yet and on the road. How do they stop, compared to the big brake kits? Will the hassel of install be worth it? |
find another rotor that fits over the van's hub and that matches the Boxster calipers . . . get the specs of the Boxster rotors and look for something similar
Willwood makes rotors with no holes drilled, you can drill them for 5X112.
_________________
Tencentlife said,
"So, now that you know what you're doing, go to town."
2010 GOLF TRENDLINE 2.5
1985 GL now with more! a 2.1L
H&R SPORT(RED) Springs FRONT , SLAM SPECIALTIES RE6 AIRBAGS REAR |
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OhChit
Samba Member
Joined: January 29, 2004
Posts: 271
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| Posted: Thu Mar 11, 2010 5:45 am Post subject: |
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Hey Guys..
Any updates on this conversion yet. I'm just about ready to upgrade my brakes and B-4 i spend the bucks on the typical Big Brake Kit, I'd like to know whats available so I can try to reuse my pretty Boxter Stoppers, but with the VW 5x112 lug patern. Trying to save my Mercedes wheels.
Does anyone have these type brakes on their rig yet and on the road. How do they stop, compared to the big brake kits? Will the hassel of install be worth it?
_________________
Fast Cars, and Slow Women Makes me DrooL. |
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Mon Jan 25, 2010 10:54 pm Post subject: |
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| BlackDogVan wrote: |
Bump... What ever came of this project? Measure once cut twice get you down?  |
HAHA! You're not too far off. Rest assured the project is still alive and well, but there's been a lot of backing and forthing with the machine shop. We've gone through 4 or 5 different prototypes, and the machinist is making them on his spare time (of which he has precious little). I finally took my van down to the shop and fitted up the latest prototype so the machinist could see with his own eyes what we were up against, as there seemed to be a communications breakdown. Anyway, I got a call from the machinist today and the final (fingers crossed!) bracket design is ready. Its just a matter of time (hopefully this Saturday) to test fit and sign off on the design.
In the mean time, here's a couple teaser pics from the last trip to the machine shop:
The Beast: HAAS 3 axis mill used to machine the brackets, with the test mule in the background.
Closeup of the mill in action, refining the shape of the prototype bracket.
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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240Gordy
Samba Member
Joined: May 15, 2008
Posts: 2354
Location: Vancouver, BC
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| Posted: Mon Jan 25, 2010 8:05 pm Post subject: |
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ya how did I miss this first time around? guess it was when I was bombing down the the autobahm . . .
_________________
Tencentlife said,
"So, now that you know what you're doing, go to town."
2010 GOLF TRENDLINE 2.5
1985 GL now with more! a 2.1L
H&R SPORT(RED) Springs FRONT , SLAM SPECIALTIES RE6 AIRBAGS REAR |
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BlackDogVan
Samba Member
Joined: December 21, 2007
Posts: 855
Location: Vancouver Island
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| Posted: Mon Jan 25, 2010 4:15 pm Post subject: |
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| Bump... What ever came of this project? Measure once cut twice get you down? |
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BlackDogVan
Samba Member
Joined: December 21, 2007
Posts: 855
Location: Vancouver Island
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| Posted: Fri Aug 14, 2009 6:55 am Post subject: |
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| Tristar Eric wrote: |
Pedal is super firm with the stock master cylinder. I also use a Wilwood adjustable brake bias valve. I found the rears to be locking first with the stock bias valve.
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Hey Eric how much work was that to install? I've been thinking about that for my setup... |
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Tristar Eric
Samba Member
Joined: July 25, 2004
Posts: 1262
Location: Portland, Or
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| Posted: Thu Aug 13, 2009 5:55 pm Post subject: |
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That was the test fit pic, after I snapped the pic I realized the nipples were wrong.
Those springs are long gone! that's when I had the S van super low. It's got H&R's and bilstiens now.
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Vanagon/Transporter flares here: www.terrawagen.com
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onwardtothestars 
Samba Member
Joined: April 04, 2007
Posts: 385
Location: Hazenville Pass Wyoming
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| Posted: Thu Aug 13, 2009 5:33 pm Post subject: |
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I'm wrong then, thanks for clarifying 
I was envisioning older VW and early Porsche calipers in my mind.
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Beetle, Ghia, Vanagon Syncro, and more |
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Thu Aug 13, 2009 5:17 pm Post subject: |
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| onwardtothestars wrote: |
| I'm not Eric but there's two bleeders, one up one down, so the caliper can be used universally on the left of right side of the van/car |
Not true. The two bleeders are on the same "end." One bleeds the inner chamber, one bleeds the outer. They both must face up or you'll never get the bubbles out. If you notice in the picture there is a crossover tube opposite the bleeders that feeds fluid from the inner chamber to the outer. That tube can be swapped with the bleeder screws if need be. You can't just swap these calipers side to side willy nilly. The pistons are differet sizes to maintain even pad wear, so you need to make sure the pistons stay in the proper orientation. I'm not sure if a Boxster uses leading or trailing calipers, but if its trailing, you'll need to swap the bleeders and crossover tube to keep the pistons in proper orientation with the rotation of the wheel. I'm sure that's why Eric had the caliper installed "upside down."
TTFN,
Adam
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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onwardtothestars
Samba Member
Joined: April 04, 2007
Posts: 385
Location: Hazenville Pass Wyoming
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| Posted: Thu Aug 13, 2009 3:28 pm Post subject: |
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I'm not Eric but there's two bleeders, one up one down, so the caliper can be used universally on the left of right side of the van/car
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pete000
Samba Member
Joined: July 29, 2004
Posts: 645
Location: Bradenton Florida
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| Posted: Thu Aug 13, 2009 1:50 pm Post subject: |
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Here is an old picture I had of Erics Boxster set up.
Hey Eric I just noticed the bleeders are pointing down, whats up with that...
And is that a prototype H & R Cup spring on there? Interesting bend. I didn't notice that before either.
_________________
1990 Vanagon
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Koni Shocks
Witech Springs
Addco Sway Bars Front-Rear
OEM Porsche Wheels
Recaro Power-Heated seats
JL Audio, Kenwood, Soundstream, MB Quart, Audiocontrol |
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Wed Aug 12, 2009 4:01 pm Post subject: |
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| a914622 wrote: |
Toyota 4 pot fronts from a 96 solid like the brembos/ 996 porsche . rotors are 12.4 dia. and 1.26 thick. I think the pistons are staggered size. 20mm front 19 mm back but im not sure of that. The rotors are almost the same as the Syncro offset and one of the 2 bolts on the caliper is almost the same as the vanagon. Rears are floating audis.
I was just think if you had a program that spit out the bias, it would be interesting to see what im running..
thanks jeff |
You might want to confirm those piston diameter numbers. I don't have a program, just do the math by hand. I can't find all my paperwork at the moment, but I know that the Big Reds with their 36mm and 44mm diameter pistons are actually a close match to the stock caliper's large single piston. If the Toyota caliper does in fact use 19 and 20 mm pistons they'd produce considerably less torque than the stock caliper and you'd need a huge rotor to compensate. I also need to know the pad coefficient of friction, but those numbers are VERY hard to come by.
I'm interested in your rear caliper bracket. What rotor do you use?
TTFN,
Adam
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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a914622
Samba Member
Joined: July 29, 2004
Posts: 917
Location: Westend of HWY2 , Wash
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| Posted: Wed Aug 12, 2009 3:20 pm Post subject: |
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Toyota 4 pot fronts from a 96 solid like the brembos/ 996 porsche . rotors are 12.4 dia. and 1.26 thick. I think the pistons are staggered size. 20mm front 19 mm back but im not sure of that. The rotors are almost the same as the Syncro offset and one of the 2 bolts on the caliper is almost the same as the vanagon. Rears are floating audis.
I was just think if you had a program that spit out the bias, it would be interesting to see what im running..
thanks jeff
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87 gl powerd buy 2.5subaru
75 914 getting 2.2t subaru scratch that SVX subaru |
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Wed Aug 12, 2009 1:16 pm Post subject: |
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Hi Jeff,
Are you talking about using the Toyota brakes for the front or rear? Do you have the specs handy? Rotor diameter, offset, bolt pattern, center bore, and caliper piston diameter/count? Is the caliper a floating style? I assume it is, in which case its a moot point.
TTFN,
Adam
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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a914622
Samba Member
Joined: July 29, 2004
Posts: 917
Location: Westend of HWY2 , Wash
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| Posted: Wed Aug 12, 2009 11:41 am Post subject: |
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[quote="Dingchowping"][quote="Tristar Eric"]Pedal is super firm with the stock master cylinder. I also use a Wilwood adjustable brake bias valve. I found the rears to be locking first with the stock bias valve. [quote]
I bet! My calculations show that the stock brake torque bias is about 1.57:1. My guess based on the slightly smaller pistons used on the Boxster calipers vs. Big Reds is your static brake torque bias is somewhere around 1.2 without the bias valve. My system will err in the other direction, increasing bias 1.7:1. I'd like to get that number a bit closer to stock, but that requires bigger rotors (I'm already planning to run the biggest rotors that will fit behind 16" wheels with the V8 calipers), or bigger calipers, which isn't an attractive option for other reasons (cost, added piston displacement, rotor availability/compatibility, etc...).
[quote=]I made an internal hub e-brake like the 911's.
| Quote: |
That is VERY cool Eric! Nice job. That would open a world of possibilities for more ideal caliper choices, assuming you can find a compatible rotor with internal drum. That would allow the Brembo 2 piston caliper used by Subaru for the STI and by Stoptech (the ST20). Thanks for the pics, Eric.
TTFN,
Adam |
Adam
So just for grins, plug the Lexus LS400 1996 front calipers and rotors in your system. Is that closer to the stock bias???
jeff l
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87 gl powerd buy 2.5subaru
75 914 getting 2.2t subaru scratch that SVX subaru |
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Wed Aug 12, 2009 11:29 am Post subject: |
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[quote="Tristar Eric"]Pedal is super firm with the stock master cylinder. I also use a Wilwood adjustable brake bias valve. I found the rears to be locking first with the stock bias valve. [quote]
I bet! My calculations show that the stock brake torque bias is about 1.57:1. My guess based on the slightly smaller pistons used on the Boxster calipers vs. Big Reds is your static brake torque bias is somewhere around 1.2 without the bias valve. My system will err in the other direction, increasing bias 1.7:1. I'd like to get that number a bit closer to stock, but that requires bigger rotors (I'm already planning to run the biggest rotors that will fit behind 16" wheels with the V8 calipers), or bigger calipers, which isn't an attractive option for other reasons (cost, added piston displacement, rotor availability/compatibility, etc...).
[quote=]I made an internal hub e-brake like the 911's.[quote]
That is VERY cool Eric! Nice job. That would open a world of possibilities for more ideal caliper choices, assuming you can find a compatible rotor with internal drum. That would allow the Brembo 2 piston caliper used by Subaru for the STI and by Stoptech (the ST20). Thanks for the pics, Eric.
TTFN,
Adam
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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Tristar Eric
Samba Member
Joined: July 25, 2004
Posts: 1262
Location: Portland, Or
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| Posted: Tue Aug 11, 2009 8:18 pm Post subject: |
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Pedal is super firm with the stock master cylinder. I also use a Wilwood adjustable brake bias valve. I found the rears to be locking first with the stock bias valve.
I made an internal hub e-brake like the 911's.
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Dingchowping
Samba Member
Joined: March 31, 2009
Posts: 134
Location: Seattle, WA.
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| Posted: Tue Aug 11, 2009 1:45 pm Post subject: |
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Hi Eric,
Just curious, how's the pedal travel/feel? That's a LOT of pistons you're displacing! I spent a lot of time calculating master cylinder piston displacement vs. stock in an attempt to avoid excessive pedal travel. You're the only one I know running a similar setup...I'd like to know what to expect.
Also, how did you deal with the parking brake? Separate caliper? Or just don't use it? I'm using the V8 rear caliper because I want to keep the parking brake function.
TTFN,
Adam
_________________
TTFN,
Adam
"For once you have tasted flight,
You walk the earth with your eyes turned skyward;
For there you have been,
And there you long to return."
-Leonardo da Vinci |
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