Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Oct 2014
Posts: 34
930 Turbo brakes on SC

Hi Guys,

I am building a historic FIA 911 SC track car. On the homologation papers it is allowed to use 930 turbo brakes.
I got the callipers and tried to fit them but they are not a straight swap.

What is the best way to fit them? What is the original way to fit them? Do I have to change the trail arms or any other parts?

Any tips are welcome.
Thanks
Miki

Old 03-31-2018, 01:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Moderator
 
Bill Verburg's Avatar
 
Join Date: Dec 2000
Posts: 24,132
Garage
Quote:
Originally Posted by kazmermiki View Post
Hi Guys,

I am building a historic FIA 911 SC track car. On the homologation papers it is allowed to use 930 turbo brakes.
I got the callipers and tried to fit them but they are not a straight swap.

What is the best way to fit them? What is the original way to fit them? Do I have to change the trail arms or any other parts?

Any tips are welcome.
Thanks
Miki
Front calipers are a straight bolt on, the floating rotors used thru '80 are a straight bolt on, if you have the later 1 piece front rotors they can only be used w/ 930 fenders+'80 up 930 hubs.

rear rotors are a bolt on, you will need to ditch the splash shields. The rear rotor on a 930 are trailing mount oe, to retain the trailing mount position 930 trailing arms are required. If using the stock 911 trailing arms then the rear calipers must be converted to leading mount and the left goes on the right side and vice versa. The conversion further involves amching the calipers to 3" 911 mounts.

here is a stock 930 rear bottom and one modified for use on the back of a 911 modified


an additional issue is the feed on late calipers, early ones won't have this issue

stock late('87 up) 930 feed


what it needs to look like and earlier 930

__________________
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
| Pelican Home |Rennlist Wheels |Rennlist Brakes |
Old 03-31-2018, 02:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Formerly known as Syzygy
 
Canada Kev's Avatar
 
Join Date: Mar 2008
Location: Calgary, AB
Posts: 4,393
Do the rears also not need to be machined slightly to remove a couple mm off the fins?
__________________
Kevin

1987 ROW coupe, Marine blue, with a couple extra goodies.

The cars we love the best are the ones with human traits, warts and all.
Old 03-31-2018, 02:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Moderator
 
Bill Verburg's Avatar
 
Join Date: Dec 2000
Posts: 24,132
Garage
Quote:
Originally Posted by Canada Kev View Post
Do the rears also not need to be machined slightly to remove a couple mm off the fins?
Depends on the wheels
__________________
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
| Pelican Home |Rennlist Wheels |Rennlist Brakes |
Old 03-31-2018, 03:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Senior Advisor
 
James Brown's Avatar
 
Join Date: Apr 2007
Location: Bellingham, WA
Posts: 5,470
Garage
Send a message via Yahoo to James Brown
VCI offers several kits for this conversion VCI - Porsche 911- 930 69-89, 914/6 brake upgrade page
__________________
08 Cayenne Turbo
Old 03-31-2018, 03:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Irrational exuberant
 
ChrisBennet's Avatar
 
Join Date: Aug 2001
Location: Nashua, NH USA
Posts: 8,133
Garage
You need to remove the tab or “ear” on th rear trailing arm the the splash shield bolts to.
I heard this referred to as “Van Goghing the trailing arms" once. [1] Still cracks me up.

[1] Van Gogh cut his own ear off.
__________________
'80 911 Nogaro blue Phoenix!
'18 BMW 340i xdrive
http://members.rennlist.org/messinwith911s/

Last edited by ChrisBennet; 04-01-2018 at 07:24 AM..
Old 03-31-2018, 08:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
Join Date: Oct 2014
Posts: 34
Hi Bill,

Thanks for the help. I dont want to modify my rear calipers - they cost way too much.
That means i need to change my rear trailing arms right?
For the front which floating rotor would you suggest? Competition use.
Thanks
Miki



Quote:
Originally Posted by Bill Verburg View Post
Front calipers are a straight bolt on, the floating rotors used thru '80 are a straight bolt on, if you have the later 1 piece front rotors they can only be used w/ 930 fenders+'80 up 930 hubs.

rear rotors are a bolt on, you will need to ditch the splash shields. The rear rotor on a 930 are trailing mount oe, to retain the trailing mount position 930 trailing arms are required. If using the stock 911 trailing arms then the rear calipers must be converted to leading mount and the left goes on the right side and vice versa. The conversion further involves amching the calipers to 3" 911 mounts.

here is a stock 930 rear bottom and one modified for use on the back of a 911 modified


an additional issue is the feed on late calipers, early ones won't have this issue

stock late('87 up) 930 feed


what it needs to look like and earlier 930

Old 04-01-2018, 04:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Uncertifiable!!!
 
Uwon's Avatar
 
Join Date: Jan 2011
Location: Muskoka, Canada
Posts: 1,666
Garage
Quote:
Originally Posted by kazmermiki View Post
Hi Bill,

Thanks for the help. I dont want to modify my rear calipers - they cost way too much.
That means i need to change my rear trailing arms right?
For the front which floating rotor would you suggest? Competition use.
Thanks
Miki
Modifying/buying new rear trailing arms is also going to cost you a bunch.
Here is my setup which has worked flawlessly on two cars over some 20 years.





All home modified to fit 930 Fuchs on an SC body.
Cheers,
Johan
__________________
Living well is life's best revenge- George Herbert (1593-1633)
2006 C2S, A4 Quattro, the RST hot rod-http://forums.pelicanparts.com/porsche-911-technical-forum/748639-evolution-carrera-rst.html
Old 04-01-2018, 04:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Oct 2014
Posts: 34
HI Johan,

that looks really nice. How did you manage to put them on?
Thanks,
Miki




Quote:
Originally Posted by Uwon View Post
Modifying/buying new rear trailing arms is also going to cost you a bunch.
Here is my setup which has worked flawlessly on two cars over some 20 years.





All home modified to fit 930 Fuchs on an SC body.
Cheers,
Johan
Old 04-01-2018, 06:03 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
cycling has-been
 
bkreigsr's Avatar
 
Join Date: Sep 2004
Location: Jersey Shore
Posts: 6,355
Quote:
Originally Posted by kazmermiki View Post
...Thanks for the help. I dont want to modify my rear calipers - they cost way too much....
Thanks
Miki
Modifying the rear caliper isn't going to decrease its value or diminish its utility.
In fact, it might even add to it's value - as it will now be more accessible to more models with 3 inch spacing. If you go that route, get done right - hogging out the hole is unacceptable. IMHO
FWIW, I've put these on 3 911s and did not have to shave the fins with any of the factory Fuchs. I did have to use 1/4 inch spacers with 8 inch wide 951 wheels in front.
Bill K
__________________
73 911T MFI, 76 912E, 77 Turbo Carrera
Old 04-01-2018, 06:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered
 
911tracker85's Avatar
 
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,501
I am doing this on my project. 78 SC/930 conversion. guy who had this car built in 89 did full metal widebody slant and stuffed a modified twin plug 3.3 turbo motor in it. left brakes and suspension SC, but looked like the rear Tbars were new and probably bigger than SC stock.

got a pair of 78 930 calipers I plan to use. have heard/read about mods needed on the rear but never found detailed schematic or pics.

I've heard using small spacers on rear eliminate all/most of the issues. but think still needs some machining somewhere.

Uwon,
can you post a pic of how they bolt to the arms? and point out the mods you made?

thanks.
__________________
Bob Cox
84 928S, Ruby Red linen/brown interior - preferred DD
87 924S resurrect and gut and another track car...
86 944 turbo my new DE/track car.
78 930 clone project car.
Old 04-01-2018, 07:29 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered
 
group911@aol.co's Avatar
 
Join Date: Nov 2001
Location: Denver
Posts: 8,070
Sent my bare trailing arms out to a guy in California that welds new mounting tabs on them for a straight bolt on. About $300 for the pair several years ago.
__________________
Thanks,
Bob
group911@aol.com
Old 04-01-2018, 07:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Moderator
 
Bill Verburg's Avatar
 
Join Date: Dec 2000
Posts: 24,132
Garage
Quote:
Originally Posted by kazmermiki View Post
Hi Bill,

Thanks for the help. I dont want to modify my rear calipers - they cost way too much.
That means i need to change my rear trailing arms right?
For the front which floating rotor would you suggest? Competition use.
Thanks
Miki
Changing the trailing arms is a much bigger and expensive and intrusive process than just having the calipers machined

To change the trailing arms first new torque boxes need to be welded to the t-bar tube, then 930 fenders are needed to accommodate the wider track imposed by the 930 trailing arms.

Much easier to have the calipers modified.

The best and most expensive would be the '78 oe floaters
you would need the hardware and rotor annulus as shown here, top



There are also non floating setups, some plain some drilled some grooved, VCI for one offers one, as do a couple of other outfits
__________________
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
| Pelican Home |Rennlist Wheels |Rennlist Brakes |
Old 04-01-2018, 09:42 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Registered
 
Join Date: Jul 2006
Location: San Diego, CA
Posts: 125
You might be interested in these: FS: 930 Floating Front Brake Hat Kit (930.351.457.01, 930.351.423.00)

Old 04-02-2018, 09:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
Registered
 
Join Date: Jan 2003
Location: Annapolis MD
Posts: 959
Quote:
Originally Posted by group911@aol.co View Post
Sent my bare trailing arms out to a guy in California that welds new mounting tabs on them for a straight bolt on. About $300 for the pair several years ago.
Can you pm me the info for this guy? Thanks.
Old 04-02-2018, 09:20 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Registered User
 
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,006
Quote:
Originally Posted by JimmyT View Post
These are VERY good!!!!!!!
__________________
Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 04-02-2018, 10:06 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
KTL KTL is offline
Schleprock
 
KTL's Avatar
 
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,324
Don't forget the caliper spacer washers for the front. They're 3.5mm thick and you need four (two per caliper). They're improperly placed in the diagram as #33 (identified as "spacer" in the parts listing) because they should be placed on the inboard side of the mounting ear, not underneath the M12 mounting bolt (#32) & spring washer (#34)



Here they are pictured in place




JimmyT's stuff is top shelf all day long. He has some great parts and tools to offer.

I always like to think & giggle of this classic movie clip when it comes to high quality stuff, even though Cousin Eddie's idea of "nothin' but the best" is clearly misplaced in our discussion here


https://www.youtube.com/watch?v=gclIIayWDf0
__________________
Kevin L
Present: '86 Carrera, 89 Corvette Z51 6spd
Past: '87 Carrera, 79 911 SC widebody racecar
Old 04-02-2018, 10:42 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered User
 
Join Date: Feb 2012
Location: Germany
Posts: 18
I have bought the spacers and flanges from Jimmy some weeks ago. Verry good stuff!
Old 04-03-2018, 12:53 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
Registered
 
911tracker85's Avatar
 
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,501
pics of rear? that is where the options/challenges are.
__________________
Bob Cox
84 928S, Ruby Red linen/brown interior - preferred DD
87 924S resurrect and gut and another track car...
86 944 turbo my new DE/track car.
78 930 clone project car.
Old 04-03-2018, 07:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Registered User
 
angelny911's Avatar
 
Join Date: Feb 2005
Location: New York.NY
Posts: 328
Chime

__________________
pca 30 year member,1977 porsche turbo body targa
56 vw ragtop oval
01 harley sportster
18 Chevy Colorado diesel
BIG RED Firetruck and assorted v-dub ,porsche parts hoarder..LoL
Old 04-03-2018, 08:45 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 01:16 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.