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Discs for Big Red/Blacks

John Sims

John Sims

PCGB Admin
Member
Having just secured a set of Big Blacks for Beaky (Well spotted Paul..thanks Ed) what news can you boys give me on discs.

I have managed to track down some 928GTS discs at Euro Car Parts for £165 each. They are also selling 993 Turbo discs @ £107 each. But are these the same as the 993TT?

I have the following Porsche part numbers:-

928 GTS
928-351-045-01 (Left)
928-351-046-01 (Right)

993 TT
993-351-045-10
993-351-046-10

I don't necessarily want to pay Porsche prices but will check with my OPC.

What is the difference between the 928 GTS and 993TT discs?
 
993 disks do not fit. You need either 928 GTS if you want solid or 964 Turbo (965 part numbers) if you want holey.

The reason they don't fit is that the bell is 5mm too deep on the 993 putting the disk 5mm too far inboard.

Check with Exeter as well as your local OPC - I bet they'll be chaper and I can always pick them up and meet up with you one weekday evening after I get back to hand them over to you if you can wait until the second week of Feb.
 
I believe the 993 turbo discs are the wrong offset for 944's so you need to go for the 928GTS or 964 turbo discs (which are the same I believe). Lindsay racing do a tasty looking anodised aluminium replacement bell for the two piece 993 turbo discs, which I was tempted with as they would look the dogs dangly's, but you can't source the disc part of the two piece assembly on it's own from Porsche so I didn't bother.

I'm pretty sure the 993 turbo and the 993TT are the same car.
 
BTW now Ed has sold I can make it clear that Exeter still have a couple of sets of Big Blacks at the same price if anyone is feeling they missed out.
 
OK, still confused.

The reference to 993TT came from the Linsey Racing site, together with the part numbers, so I was assuming they would fit.

Any road up Euro Car Parts 911 3.6 Turbo (964) 93-94 are £105 - one assumes they are holey so why are they 2/3rds the price of the 928 GTS discs if they are the same?
 
I think the references to the 993TT discs on the Lindsay site refer to the Aluminium rotor hats I mentioned earlier which utilise the disc from the two-part disc/hat assembly as fitted to the 993TT (link below). This would require you to also get the 993TT discs, unbolt the disc from the hat and attach to the Lindsay manufactured hat. They would look the business but sourcing the disc part of the assembly seems to be tricky and I doubt the robustness of the anodised aluminium rotor hat on the salty winter roads of the UK. As Fen said you are looking at either the 928GTS discs or the 964 turbo drilled discs. You could use 993TT disks if you used a spacer between the 944 hub and the disc hat but this would push your wheel out and ruin your wheel offset.

http://www.lindseyracing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=LR&Product_Code=LR-8789-BBHAT&Category_Code=944BRAKECOMP
 
Thanks guys. Looks like 964 Turbo discs then...'cos I like holes and, so far, it will save me £120.

Glad I asked.
 
I have a really good link with all the details on sizes and weights etc for these brakes, calipers, discs but I can't post a link. Maybe as I'm not a member, but if anyone wants me to email it to them I'll do so and you can post it. I have bookmarked it into my favourites as it is very useful from time to time.
Patrick pgarvan@bigpond.net.au
 
I Did a "Big red " conversion on my 968cs,used it alot on the track with hard pagids,whenever they(the discs) got a bit wobbly i had them skimmed locally,i had two sets of 928 gts discs at a time, one off the car being skimmed ,one set on, got max wear like that,the probem with holey discs is they crack really quickly, even all Gt3 boys who track alot Don't use drilled discs they convert to solid Alcons to avoid swapping their discs every five minutes.Depends how much you want to track it.The holey discs do look the biz though.
 
I had 993RS discs first and they didn't fit. Because I know Adrian well he swapped them for me. My holey ones have cracked slightly, but still within tolerance. OE discs from the OPC have a 2 year warranty and I would just have got them replaced FoC had the car been running long enough to completely destroy them.
 
I would be very impressed with that!,if you have good ties with the parts guy and he swaps discs for heat cracks you are very lucky ,i know Jonathan at Notts quite well but he would tell me to jump in the lake if i tried that one,fair wear and tear and all that!Gt3 discs start to crack after 2-3 days out depending on Driving style,i remember i got one set swapped on my mk1 and then they said get stuffed,in a polite way of course..Its even more of a bummer if you have ceramic Porsche discs they cost silly amounts,they get very fidgety on warranty claims with those,thats why most people pull them straight off the car,replace with "cheap" steel discs and put them in a box till resale time.
 
Great link, thanks for that Olli.

I know it is OT but I was intrigued by the 928 electro luminescent gauges - just as well they don't fit a Turbo or that could be something else on the list.

While I note all of your comments with regard to drilled discs cracking, I do much prefer the added bite you seem to get from drilled discs (and they look the nuts [;)]). Obviously it is a risk but, considering the drilled discs are 2/3rds the, not insignificant, price I might well risk it.

I was a little disturbed by Marks comments with regard to constantly warping discs. I wonder if the two part configuration makes them more stable? Perhaps it would be work going for the aluminium top hats with 993 "rotors".
 
ORIGINAL: 333pg333

I have a really good link with all the details on sizes and weights etc for these brakes, calipers, discs but I can't post a link. Maybe as I'm not a member, but if anyone wants me to email it to them I'll do so and you can post it. I have bookmarked it into my favourites as it is very useful from time to time.
Patrick pgarvan@bigpond.net.au
Click to expand...

Herewith Patrick's link:-

http://www.pelicanparts.com/MotorCity/wmv/brakes.htm

Made my head hurt. [;)]
 
Yes nice link Olli and it should be as you are in the process of putting on the 6 piston GT3's if I'm not mistaken, just like your friend Pete? Have you posted those pics on here too? If not, I'm sure the guys would love to see all the pretty 'Candy'![:D][:D][:D]
 
Yes i occasionally hang around here too ;) I have GT2 front / GT3 rear brakes for my 951.
bigyellow1.jpg
 
Hi john,Re the warping i was using Pagid orange and possibly Black pads that are fairly(really really!!) hard on the discs they sound like metal on metal sometimes,went to PFC pads and they were kinder if i remember,but they had so much bite you could stand the car on its nose!Just found after a day or two they almost distorted the surface of the disc and they developed a wobble...but after the skimming it went away temporarily.Was driving the 968cs on cheap Pirelli slicks and with the big red brake settup you could chase allsorts and really upset them,but after a while i got sick of the lack of grunt and went back to a Turbo[:D][:D]
 
ORIGINAL: 333pg333

I have a really good link with all the details on sizes and weights etc for these brakes, calipers, discs but I can't post a link. Maybe as I'm not a member, but if anyone wants me to email it to them I'll do so and you can post it. I have bookmarked it into my favourites as it is very useful from time to time.
Patrick pgarvan@bigpond.net.au
Click to expand...

dont know if it will work but I usually just paste in a link and dont even bother with the thingy at the top
Tony
 
I love those brakes Olli, they look absolutely huge [8D]

Confidence inspiring brakes on a track car are one of the most reassuring upgrades you can do. I've never had a problem with the standard Turbo brakes on a standard Turbo but I'm pretty sure I'll be needing to change them soon so I've been following your brake upgrade threads with interest.

Interestingly, from reading the various Titanic and PCGB forums the brakes are one of the first things that UK GT3 owners seem to change when doing a lot of track use. JZM and Parrs Motorsport both provide alternative brake setups that are more suited for trackwork than the Porsche Brembos [&:]
 
ORIGINAL: John Sims

While I note all of your comments with regard to drilled discs cracking, I do much prefer the added bite you seem to get from drilled discs (and they look the nuts [;)]). Obviously it is a risk but, considering the drilled discs are 2/3rds the, not insignificant, price I might well risk it.

I was a little disturbed by Marks comments with regard to constantly warping discs. I wonder if the two part configuration makes them more stable? Perhaps it would be work going for the aluminium top hats with 993 "rotors".
Click to expand...

I fully intend to use Performance Friction rotors next time I need a set to replace the 964 Turbo ones - they look uber sexy.

Mark, I can't see how they can get out of replacing the disks on warranty. They come with a 2 year warranty and no restriction on the use of the disk, and they have a tolerance level for the cracks. That makes it black and white in my mind.
 
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