Girodisc 2pc 348-355 Front rotors released

Eric,

I am a club sprint racer so I do not reach the repeat limit of even the OEM brakes with race pads and 3" ducts. So by your statement big brakes would not do much for me. I am not an engineer so please bare with me. At 100mph is about 150ft/sec travel. If a larger brake or more efficient brake can lock me up into ABS 0.1 seconds faster than stock that equals 1 car length (15 ft) on the race track. Therefore I effectively dive deeper in the corner by delaying braking 0.1 secs which may be all the margin needed in a close pass. Well maybe 0.2 secs is better but do see where I am going? So while a big brake and small brake get me to ABS and does not effect stopping distance since it is all about tire management what about the improved time to get to ABS due to larger big brake rotor torque and increased big caliper clamping forces? I know that brakes are not "stabbed" to lock-up but progressively applied for most stable efficient braking but does a big brake get me to threshold braking faster even if properly progressively used?

 

I would like to use the stock calipers on larger rotors too. Though I think the 'stock' caliper mounting bolts are a lateral configuration, so it would be hard to make an adapter due to holes being too close together IMO.

 

+1

Agree absolutely. Was at Laguna Seca 3 weeks ago and the ABS worked flawlessly, but only deep into the turn where it should.

 

You mean like this....14" front, 13" rear. Wilwood SRP drilled and slotted rotors, Wilwood Hats. Custom brackets, modified hats, and highly modifed rear rotors, since WW had limited rotor selection for that hat. Also, Goodridge hoses, and Wilwood 570 brake fluid. Hawk pads for the track and stock Brembo pads for the street.
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What size are these rotors??

 

That's sharp!

If you don't mind me asking, what "hat" would I order if (or would they work at all) I wanted the lightest realistic rotors for a daily-driven, non-raced 348 Spider?

Could scalloped rotors like these be ordered in some configuration to work on a 348 for street driving: http://www.stockcarproducts.com/brakes14g.htm

 

Did you want stock diameter or larger diameter rotors? The scalloped rotors are to narrow, they are for sprint cars, but cool none the less.

 

14" x 1.25" front; 13"x 1.10" rear. you could go with a 14 x 1.10 up front for a stock caliper but I have F-550 sport calipers up front, it uses a 14 x 1.25. The front conversion was super easy, the rear, was another story, 3 sets of rotors and 3 sets of hats to get something to fit over the large rear wheel hub area. Now, it can be done, but the rotor & hat still need alot of maching to get them to work. I'm sure if Wilwood gets enough requests for the rear rotor/hat combo they'll cut the rotors to size. Sure beats spending 6g's plus for a complete front/rear B-bo big brake kit

 

OK. Thanks. I would want the lightest (realistically) front rotors for a street 348. If my wife wants to drive the Spider, she'd appreciate lighter manual steering.

What else can I do besides lighter wheels...but lighter rotors? I wouldn't want to sacrifice street braking distance, but surely there are options, especially with a 2-piece rotor, lighter than OEM 348 front rotors.

 

Throw some gas on that fire. I'll be looking at new front rotors soon. It would be great to give ya the business.


Darrell.

 

I think there'd be a market for brake kits that allowed the use of the OEM caliper and lightweight brake discs. A kit with an adapter bracket, lightweight rotor and maybe some stainless steel brake lines. IMO, all Ferraris, at least pre 360, could benefit from such a kit. The 355 caliper is a nice size as are, e.g., the 512 calipers. Such a kit would be great. I'd be down for a set for my 512 and 355. (The Brembo kit is too small for my $3k for 332 mm. I'd want at least 355mm/14")

What do you think Eric: Start a new thread to see how many folks would purchase the kit?

 

Kit already exists as stoptech front $2500ish or $5kish front and rear. Front's are 14" and do not require new master cylinder. Rumors from those who use stoptech say that the kits are well engineered to not need new master cylinders in general nor need rebiasing of brake balance.

 

Pics of my 308 (aka "358") brakes: 380mm disc (just 13.2 pounds), aluminum bell (3.5 lbs) and eight piston brembos. Waiting on the 19" 3-piece wheels to install this ultimate system.

What size rotors are the new Brembo F355 kits?
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Reading all this with interest. Have ordered the Stoptech big brake front kit. Arriving in the next two months as they are out of stock. Would have been nice to go down a cheaper route but was sucked into this by a friend who swears by the Stoptech setup.

 

Please let us know how you like it. Stoptech is only 5 miles from me. Tell me if you can dive deeper into corners like my post that was not answered (missed) by Eric. I think there is more to big brakes than just repeat poundability but that is just intuitive thinking.

<<At 100mph is about 150ft/sec travel. If a larger brake or more efficient brake can lock me up into ABS 0.1 seconds faster than stock that equals 1 car length (15 ft) on the race track. Therefore I effectively dive deeper in the corner by delaying braking 0.1 secs which may be all the margin needed in a close pass. Well maybe 0.2 secs is better but do see where I am going? So while a big brake and small brake get me to ABS and does not effect stopping distance since it is all about tire management what about the improved time to get to ABS due to larger big brake rotor torque and increased big caliper clamping forces? I know that brakes are not "stabbed" to lock-up but progressively applied for most stable efficient braking but does a big brake get me to threshold braking faster even if properly progressively used?>>

 

Can you locate matching "slotted" rears for the 355?

 

How much are the brembo OE rears?? Can you slot those??

 

Will do, though I feel it is going to enhance brake fade more than anything. Limitation as far as I know will always be the tyres tied to the ABS or ability of my foot to efficiently modulate the brakes.

 

I don't know that I'd agree Eric. Too much weight? Brake disc, hat and caliper weighing 28.7 pounds? The smaller StopTech hat and rotor alone weigh 16 pounds. In a nutshell, my 380mm 8 piston set up weighs about the same as others 355mm 4 piston kits. The Little Gallardo uses the same exact caliper and it's the V8 Ferrari competitor. The 8 piston Brembo also uses 4 pads per caliper which gives you twice the amount of "leading edge" which gives you the "bite" which drivers appreciate. The 8 piston is also a monobloc caliper, meaning not made of two pieces bolted together with heavy bolts. Ergo, she's lighter than one would expect. So, lightweight, good bite and ultimate power. What's wrong with that? My front tires will be 275mm. Rears at 345mm. Screw ABS. Will be using a larger bore Master but that's not such a big deal.

 

Here are some slotted rotors for the rear to match the fronts!!!

Link:

http://www.frozenrotors.com/products/power-slot-cryo/Ferrari/