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In Reply to: Brake Rotors: slotted versus drilled posted by Steven R. Rochlin on August 20, 2004 at 21:09:12:

"As for brake balancing (front/rear biasing) for track, you can either play around with different brake pad compounds and/or have installed a brake bias adjuster. Why have adjustable
bias (front/rear balance) of the braking system? Because different tracks and track conditions can be fine-tuned for optimum lap times. As an example, during wet track days you will
want to increase the percentage of rear brake biasing a bit."

Well, playing with biasing is generally not a good idea, even for experienced racers. It's all too easy to overbias the rears, which will quickly lead to a spin. The front does 60-80% of the work in most cars, (except maybe those with more rear weight bias, e.g. 911, NSX, etc.) and adding more rear bias isn't necessarily going to help in general. In an iffy situation, it will/may result in rear lockup sooner, which you never want. It's also too easy to mis-adjust it on the fly, I know people who have spun/crashed/gone off because of this, and they were fairly high-level racers that knew what they were doing, just happened to hit the lever or knob at the wrong time.
Anyway, good info in the above post! (time to Track your car soon, methinks. ;-)
-Ed

Follow Ups:

Re: follow up - Steven R. Rochlin 08:10:43 08/21/04 (4)
Ed,
Cool! Thanks for chiming in! Always good to meet a racer :)

> > > Well, playing with biasing is generally not a good idea, even for experienced racers. It's all too easy to overbias the rears, which will quickly lead to a spin. < < <

Agreed, and one needs to be VERY cautious with brake biasing. This is why i was very, VERY, did i mention being VERY adamant about keeping stock brake bias for 'normal' drivers. As you know there are professional bias adjusters that allow for SMALL increments of adjustment. This was part of the reason i am soooo glad to have connected up with the Brembo guy as he was THE ENGINEER AND TESTER who designed the system for the Ferrari and, as such, was able to give me top quality advice/tips/pad choices, etc.

> > > The front does 60-80% of the work in most cars, (except maybe those with more rear weight bias, e.g. 911, NSX, etc.) and adding more rear bias isn't necessarily going to help in general. In an iffy situation, it will/may result in rear lockup sooner, which you never want. It's also too easy to mis-adjust it on the fly, I know people who have spun/crashed/gone off because of this, and they were fairly high-level racers that knew what they were doing, just happened to hit the lever or knob at the wrong time. < < <
Agreed. One needs to be VERY cautious about biasing. Locking up the rear first is a fast way to crash... or die :(

> > > Anyway, good info in the above post! (time to Track your car soon, methinks. ;-) < < <
2005 baby. Was hoping for late in the season 2004, yet am still tuning her. Kinesis is a bit late at delivering my new lightweight special rims as the Ferrari has a specialized offset. Between the new rims/tires/brakes this should lighten unsprung mass by about 12 lbs per front corner and 8 lbs per corner rears. Will know more once i get all the bits and weigh in.

FYI: The rims will be 17x8 and 17x9 K27s. For the street will run the basic Mich Pilot PS2 (225/45/R17 and 255/40/R17) and am debating track tires. Once the rims arrive i will be checking tire temps and have the alignment adjusted for a middle ground as the car mainly will be street driving and about 25 or so track days in 2005. She has already been corner weighted when the new suspension was installed. Frankly, it is a compromised setup yet much better than stock IMHO. The new suspension system has really brought about positive results as compared to the lackluster stock Ferrari system. Been busy physically working out for endurance and strength while also reading many books to feed my head.
Could go on and on. So please share your wisdom, what car(s) you drive/race, etc. Always glad to meet a fellow racer and learn :) Tell us morw about you Ed :) :)
Enjoy the Drive,
Steven R. Rochlin
- Re: follow up - Rich Brkich 10:08:09 08/21/04 (3)
  "The rims will be 17x8 and 17x9 K27s. For the street will run the basic Mich Pilot PS2 (225/45/R17 and 255/40/R17) and am debating track tires. Once the rims arrive i will be checking tire temps and have the alignment adjusted for a middle ground as the car mainly will be street driving and about 25 or so track days in 2005. She has already been corner weighted when the new suspension was installed. Frankly, it is a compromised setup yet much better than stock IMHO. "
  Sounds ike its going to be a sweet set-up Steve. Have you driven around with the PS2s much? Plan on doing a wheel/tire upgrade for my GTI down the road and would be considerig the PS2s or the Goodyear Eagle F1s. I've driven a VW R32 with the Goodyear F1s and was very impressed with how the rode and handled.
  Sounds like a fun ride!
  Happy Listening,
  Rich Brkich
  Retailer & Audio Asylum Industry Liaison
  - Re: follow up - Steven R. Rochlin 10:20:29 08/21/04 (2)
    Rich,
    A most humbly thanks my friend. Alas, as the rims/tires are a 'package' i need to wait for the rims to arrive. FYI: Rims on her now are NOT stock, but Etoile 7x16 and 8x16. These will be used for winter (dare i say snow) driving and will get all weather rubber on them.
    Have heard good things about the Goodyear Eagle F1s (and as you know there are various version of the Eagles and i assume you mean the GS-D3). Will report back on the PS2 in about 3 weeks or more as once they arrive i need to scrub them, measure temps across the tread, and possibly make alignment changes accordingly.
    Enjoy the Drive,
    Steven R. Rochlin
    - Re: follow up - Rich Brkich 12:43:27 08/22/04 (1)
      I might be able to forgive you for driving your beloved in the winter since you don't get snow on such a regular basis as we do up here in lake effect country. :-) ;-) My GTI spends most of the winter snuggled in my garage.
      Happy Listening,
      Rich Brkich
      Retailer & Audio Asylum Industry Liaison
      - Re: follow up - Steven R. Rochlin 14:01:24 08/22/04 (0)
        
        In Reply to: Re: follow up posted by Rich Brkich on August 22, 2004 at 12:43:27:
        
        WOW, now that is snow :)
        Ummmm... in the foothills of the Monadnock region we get snow my friend. We get snow by the MULTI-FOOT per eve!
        Drive in the winter mainly to keep the fluids spinning and to get her all warm and happy.
        Enjoy the Drive,
        Steven R. Rochlin

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