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Raize
Joined: 18 Sep 2013
Posts: 281
Location: Scotland
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 Posted: Tue May 28, 2024 5:56 am Post subject: |
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| Ford Focus RS MK1 324mm x 28mm 4x108mm! |
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safe
Joined: 18 Mar 2017
Posts: 659
Location: Sweden
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| Posted: Tue May 28, 2024 6:23 am Post subject: |
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| Raize wrote: | | Ford Focus RS MK1 324mm x 28mm 4x108mm! |
Good find! probably needs 17" rims.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Raize
Joined: 18 Sep 2013
Posts: 281
Location: Scotland
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| Posted: Sat Jun 01, 2024 5:03 am Post subject: |
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| safe wrote: | | Raize wrote: | | Ford Focus RS MK1 324mm x 28mm 4x108mm! |
Good find! probably needs 17" rims. |
17" is the minimum size to get high performance summer street tyres now anyway since they killed the 16-inch pilot sport... kinda sucks.
The front wheel spindle strength of the 924 is very questionable though considering 944 have had catastrophic failures with thicker spindles and lighter wheels/brakes than we are discussing here...
How are you finding that 2-pot sliding caliper by the way? I really want 4-pots but seems like every asshole out there is buying them up to powder coat and sell shitty "refurbs" at ridiculous prices. |
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Cedric
Joined: 27 Aug 2004
Posts: 2721
Location: Sweden
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| Posted: Sat Jun 01, 2024 8:27 pm Post subject: |
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| Raize wrote: | | safe wrote: | | Raize wrote: | | Ford Focus RS MK1 324mm x 28mm 4x108mm! |
Good find! probably needs 17" rims. |
17" is the minimum size to get high performance summer street tyres now anyway since they killed the 16-inch pilot sport... kinda sucks.
The front wheel spindle strength of the 924 is very questionable though considering 944 have had catastrophic failures with thicker spindles and lighter wheels/brakes than we are discussing here...
How are you finding that 2-pot sliding caliper by the way? I really want 4-pots but seems like every asshole out there is buying them up to powder coat and sell shitty "refurbs" at ridiculous prices. |
17"s on the narrow body looks awful though, the UHP range is not great in smaller sizes, but theres plenty if sticky tyres available, Or half decent ones.
I wouldn't worry that much, there's plenty of 924s racing on these spindles every weekend. If i built a high grip racing car with 245 rcomps and aero i wouldn't run them, but for reasonable loads like track use with normal sized tyres it works fine.
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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safe
Joined: 18 Mar 2017
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Location: Sweden
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| Posted: Sun Jun 02, 2024 1:57 am Post subject: |
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Yes, the 16" Federal 595 rs-r I run are actually a really good performance tire.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
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| Posted: Wed Jun 05, 2024 6:28 pm Post subject: |
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| Raize wrote: | | safe wrote: | | Raize wrote: | | Ford Focus RS MK1 324mm x 28mm 4x108mm! |
Good find! probably needs 17" rims. |
How are you finding that 2-pot sliding caliper by the way? I really want 4-pots but seems like every asshole out there is buying them up to powder coat and sell shitty "refurbs" at ridiculous prices. |
1 pot actually. I've been fighting some issues with small leaks that I could't find. I think I got them now.
The brakes are pretty ok, the pedal feel is the biggest issue. I think I have narrowed it down to that the master is too small, I need a 25mm/1" master, the 931 23 mm don't move enough.
Have not yet tried the braking/thermal capacity, but I don't have any doubts about that.
Its a trade off, the 1 pot sliding caliper leaves me space towards the rim, but the piston are large to spread the force over the pad. Two smaller pistons in a sliding caliper would be much better.
I've been having other issues taking up my time, mostly fuel delivery. But yesterday I got the filters clean and the fuel pressure holding (I think, haven't checked the logs yet).
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Raize
Joined: 18 Sep 2013
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| Posted: Sat Aug 10, 2024 4:51 am Post subject: |
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| I'm going to try and make something similar, how did you do the brackets for the rear calipers? I would like to try and re-use the existing bearing cap but the thickness of the brake backing plate is not enough for a caliper mount I think. |
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safe
Joined: 18 Mar 2017
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Location: Sweden
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| Posted: Sat Aug 10, 2024 6:55 am Post subject: |
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| Raize wrote: | | I'm going to try and make something similar, how did you do the brackets for the rear calipers? I would like to try and re-use the existing bearing cap but the thickness of the brake backing plate is not enough for a caliper mount I think. |
Its thick enough. The turbo mounting bracket are the same thickness, 5mm.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Raize
Joined: 18 Sep 2013
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Location: Scotland
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| Posted: Sat Aug 10, 2024 7:41 pm Post subject: |
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| safe wrote: | | Raize wrote: | | I'm going to try and make something similar, how did you do the brackets for the rear calipers? I would like to try and re-use the existing bearing cap but the thickness of the brake backing plate is not enough for a caliper mount I think. |
Its thick enough. The turbo mounting bracket are the same thickness, 5mm. |
I mean the drum brake backing plate, it's sandwiched between the bearing cap and the trailing arm. From memory it's just some 2mm thick stamped steel. Unless it's reinforced to 5mm in the middle that I'm forgetting.
Are you using 944 bearing caps / caliper brackets? |
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safe
Joined: 18 Mar 2017
Posts: 659
Location: Sweden
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| Posted: Sat Aug 10, 2024 8:03 pm Post subject: |
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| Raize wrote: | | safe wrote: | | Raize wrote: | | I'm going to try and make something similar, how did you do the brackets for the rear calipers? I would like to try and re-use the existing bearing cap but the thickness of the brake backing plate is not enough for a caliper mount I think. |
Its thick enough. The turbo mounting bracket are the same thickness, 5mm. |
I mean the drum brake backing plate, it's sandwiched between the bearing cap and the trailing arm. From memory it's just some 2mm thick stamped steel. Unless it's reinforced to 5mm in the middle that I'm forgetting.
Are you using 944 bearing caps / caliper brackets? |
I use the original bearing caps. The backing plates are reinforced to 5 mm. Porsche just replaced it with a cast one to hold the calipers and smaller brake shoes for the parking brake.
I made new brackets in 5mm stainless to mount calipers.
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Raize
Joined: 18 Sep 2013
Posts: 281
Location: Scotland
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| Posted: Sun Aug 11, 2024 3:12 am Post subject: |
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| safe wrote: | | Raize wrote: | | safe wrote: | | Raize wrote: | | I'm going to try and make something similar, how did you do the brackets for the rear calipers? I would like to try and re-use the existing bearing cap but the thickness of the brake backing plate is not enough for a caliper mount I think. |
Its thick enough. The turbo mounting bracket are the same thickness, 5mm. |
I mean the drum brake backing plate, it's sandwiched between the bearing cap and the trailing arm. From memory it's just some 2mm thick stamped steel. Unless it's reinforced to 5mm in the middle that I'm forgetting.
Are you using 944 bearing caps / caliper brackets? |
I use the original bearing caps. The backing plates are reinforced to 5 mm. Porsche just replaced it with a cast one to hold the calipers and smaller brake shoes for the parking brake.
I made new brackets in 5mm stainless to mount calipers. |
Ah that's great, thanks. I must just be remembering it wrong from when I rebuilt my rear end.
I did notice that the brake shoes for the 944 parking brake and the brake shoes for the 924 AND the brake shoes for the peugeot 406 parking brake all have the same diameter.
So in theory, you could actually use the 406 rear discs and retain the 924 drum hardware as a parking brake.
But I don't know of any fixed calipers that are narrow enough to suit a solid disc. It would also be a negative in performance terms due to extra weight, just cool looking, to have fixed caliper rear brakes. |
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safe
Joined: 18 Mar 2017
Posts: 659
Location: Sweden
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| Posted: Sun Aug 11, 2024 5:00 am Post subject: |
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The 924 na brake drum and shoes are significantly larger than 944 or 406 brake shoes.
There is an Alfa Romeo with fixed calipers that has integrated hand brake. Dont remember which, Ala 75 maybe??
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Raize
Joined: 18 Sep 2013
Posts: 281
Location: Scotland
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| Posted: Mon Aug 12, 2024 2:48 am Post subject: |
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| safe wrote: | The 924 na brake drum and shoes are significantly larger than 944 or 406 brake shoes.
There is an Alfa Romeo with fixed calipers that has integrated hand brake. Dont remember which, Ala 75 maybe?? |
Oh, that is true on closer inspection, I don't know why Autodoc was saying 944 and 406 brake shoes are 230mm.
Alfa 75, the fixed piston caliper with a handbrake mechanism - very rare and expensive!
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safe
Joined: 18 Mar 2017
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Location: Sweden
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| Posted: Mon Aug 12, 2024 4:26 am Post subject: |
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Yes, the Alfa 75 isn't that common anymore.
Some of those had some really sweet aluminium front calipers that was bolt on for early 911's.
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
Posts: 659
Location: Sweden
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| Posted: Tue Aug 13, 2024 6:44 am Post subject: |
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NA and Turbo (showing both sides) backing plates differences for anyone interested.
The turbo one just bolts on instead of the NA if you do a conversion.
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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924 FAQ (Technical)
