924Board.org

[Euro924S2]

Hmm, from what I've also read, early 951 (uk 85-6) front discs fit behind the front hubs like a 931 - If my understanding was correct you could fit these early discs to your 931 hubs which keeps all your suspension etc unmodified. Then all you need is the brake caliper brackets you'd need anyway to mount your brembo's to the 931 hub. If that's correct (please someone confirm) then you keep your speedo drive too.

I've checked the physical disc size and it is the same as the late 951's and 944S2's. Only down side is increased effort to change discs but it's a minor negative in my eyes.

Alternatively, instead of trying to find rare 951 spindles - all 944s2's came with the brembo's so they will carry the calipers without brackets, but struts and speedo cable then need sorting.

For you though Morgen - I think your BIG brembo's mount differently to the Mini 951 brembo's????
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UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[WEASEL149]

Every time I read one of these brake threads it makes me glad I took the brake route I did.
Good luck with your conversion anyway - the other work you've done on your car is magnificent.
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1979 UK 932

[Cedric]

And I´m glad I took the simple way (refurb calipers, race pads etc)

I hope it will be worth all the trouble
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1980 924 Turbo
www.instagram.com/garagecedric/

[Raceboy]

[Cedric]

[Raceboy]

No problems. I run Ferodo DS Preformance pads on my white 924 (has '86 951 brakes) and Ferodo DS3000 pads on my Gulf race-car (has 951S/928 S4 brakes).

I think for light usage (short sprint races/track sessions) stock 931/944 brakes are just fine assuming good high-performance brake fluid (Ate Super Racing Blue, Motul RBF600 etc) and good track pads are used. Especially if the car is lightened.

But if you have to brake often from high speed for prolonged time, they start to heat up.

And of course, it depends on driving habits, I know few guys who can overheat even big brakes in no time (and on slow track)
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[Euro924S2]

Yeah, your all quite correct, I guess it is a lot of effort - but to be honest I really enjoy the improvement journey. If it's an easy route I wanted, I should just sell my 924 and BMW daily driver and buy a 996 C4S with all the toys and 50K miles for £25k and use it everyday!! Sure I'm tempted quite often, but there's nothing like the sense of achievement when a job comes good!

As for performance, I completely agree the 931 standard brakes would be just fine for my road use - I'll never cook them. I'm only fitting the Brembo's because in Red behind a set of 17's I think they look the business and will fit with my 'modernised' styling. I'm not much of a sports man so this is my challenge instead!!!

Raceboy - apologies for not crediting your wise words - I've read soooooo many post from so many forums (both 24 and 44) I've lost track of who thought what!!

Thanks Weasel, much appreciated.

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UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[Cedric]

I was just interested to know your experience since I never heard from anyone that races 931s that the brakes arent enough (and from my experience to), even Joakim.S couldnt cook his brakes with 400hp on the track.

I have a hard time thinking that a well made setup of the original brakes wont be enough for racing. But sure the brake feel and looks are better with multi piston arrangements. But imho one of the last uppgrades I´ll ever do on my track car
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1980 924 Turbo
www.instagram.com/garagecedric/

[Raceboy]

As I said, it depends on track (long straight and then slow corner), car (are you on street tires, weight etc) and how hard you drive.

You can drive 1000hp car with drum brakes also, it just won't be anywhere near the full potential of the car.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[Euro924S2]

I think I agree with you Cedric. If I was currently using vented discs front and back instead of solid ones I wouldn't bother with the upgrade either. It's just that the 931 discs get so much good press (from people like yourself) it would be nice to experience the difference. And since I've got to change everything to do the 5 stud conversion anyway, for the bit if extra work it's worth jumping to 'the best' (not that they are but you get my meaning) rather than rebuild a set of 931 calipers, only to change the later for the aesthetics. By no means an essential upgrade though from what you guys have said.
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UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp

[morghen]

with propper rubber,fluid and pads the 931 brakes can hold you in the air (locked into the seatbelt) when braking hard
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Supercharger and EFI kits
https://www.the924.com

[RC]

[WEASEL149]

The 4 pot monobloc Boxster calipers I fitted to the front of my car are one of the best decisions I made on the car.
I honestly can't imagine brakes that are any better than what I have. They're also light and very rigid.
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1979 UK 932