CB:>OK....... should have said DON'T TRY THIS AT HOME ONLY FOR TRACK USE
I'll buy this. One of the potential advantages of a front proportioning valve set up is that the inside front will drag during trail braking instead of the inside rear (kind of like a formula car ;-) ). Unfortunately you really need to keep after the adjustment as track conditions change. Eric Schieb Electron Speed Charles Brown wrote: > While I am aware that it is an imperfect solution, the only other > solution I am aware of is "carbotech panther + (6 years old compound) > on rear. > Stock 2001 pads front "= *excellent braking* > > Problem is, not well balanced when cold, and the front pad will fade > before the carbotecs, if you can push them that hard. You are > essentially > in the same boat, of unknown grip balance during warm-up, and failure > mode would be extreme rear bias with little warning.. > > The best solution is smaller front caliper pistons, the rear calipers > are already the largest available. > > OK....... should have said > DON'T TRY THIS AT HOME > ONLY FOR TRACK USE > > Regards > CB&Stoker > > ----- Original Message ----- From: "Eric Schieb" <[email protected]> > Cc: "Miata Power List (Miata Power List)" <[email protected]> > Sent: Monday, March 16, 2009 2:57 PM > Subject: Re: Big brake upgrade, installed front porporing valves > > >> While front proportioning valves have been done before (including by >> Lotus once) and can have some advantages if you know what you are >> looking for, the disadvantages are significant enough that I would try >> to come up with a brake package that does not need the brake pressure >> reduction in the front. >> >> disadvantages: >> >> -significant modulation challenges (the front brake pressure will not >> reduce until master cylinder (and rear) pressure is lower than front >> pressure) >> >> -theoretically incorrect slopes of pressure rise (if you have correct >> bias on one surface and then find a grippier one, you will become rear >> biased at a rate faster than normal)(if have correct bias on one surface >> and then it rains, you will become front biased at a rate faster than >> normal). >> >> Sorry to play a bit of a downer, but brakes are a potentially serious >> safety matter and the positives of a front proportioning valve should be >> balanced with some of the negatives before anyone tries it at home. >> >> Eric Schieb >> Electron Speed >> >> CB wrote: >>> Well I finally did it. >>> I have been living with a 2001 big brake upgrade on my 90 with way >>> too much front bias. >>> So I put in two adjustable brake purporting valves in the front! >>> lines, with no rear valve of any kind. >>> It took 7.5 turns out to get great brake bias. The fronts can still >>> be locked at will, it just takes a lot more will. >>> >>> The braking is stellar, and the rears so far have never locked using >>> porterfield R4-S all around. >>> I hope that the stock 2001 12" vented fronts don't fade before the >>> ~12.5 solid rear rotor setup, and all will be good. >>> Does anybody have the fade mode on sport rotor setup? Thinking about >>> direct ducting from the front spoiler to prevent it. >>> >>> I sure is nice to have great brakes again, hopefully the front bias >>> remains greater in all circumstances. >>> >>> Odd that the 02 sport brakes are so out of balance on a 1990 with a >>> very tight suspension setup. !???! >>> >>> >>> CB&Stoker >>> >>> ------------------------------------------------------------------------ >>> >>> >>> _______________________________________________ >>> Miatapower mailing list >>> [email protected] >>> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >>> >> >> _______________________________________________ >> Miatapower mailing list >> [email protected] >> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
