Shelbyguy, did you get a chance to discuss the ABS systems with the people you mentioned earlier? I've been racking my brain thinking about how the ABS unit's software might be setup.
ShelbyGuy said:abs units arent reprogrammable by mere mortals. too much product liability for ford/bosch.
the 00r uses the same abs ecu and hcu as the normal cobra.
there are some excellent abs threads on cornver-carvers. (just resist the temptation to post. thats free advice.)
Todd TCE said:ABS doesn't know if you have boots or not, nor if you have more or less piston area. All ABS is looking for it lack of rotation. Granted some of the newer EBD systems do monitor pressures, they'll still be balanced against the rotational aspect as well. A stopped wheel is a stopped wheel regardless of how it became so.
Boots ARE grossly over rated. They provide peace of mind to those who are in the salt belt perhaps and those who never bother to look at pad wear.
I run in more dust and dirt than you'll ever see on the street and run the same calipers six years running. Common sense and cleaning is is all that's needed between pad changes. The Honda comment is based probably on the Dynalite caliper which has min value on the street. That caliper uses pads that are just to thin in a caliper that's too light for the application IMHO. Thus the taper wear of the pad is greater and if the pad run very low they become a binding part of the caliper and can pull burrs on the caliper body.
This is dust: http://p068.ezboard.com/bhillclimbracing
And I have no issue with non booted calipers.
ShelbyGuy said:pressures are not going to vary unless you change the master cylinder, and the master cylinder has enough piston swept area to feed just about any caliper you're going to find.
the pressure applied to the caliper pistons depends on the diameter of the master cylinder piston and the leverage applied by the brake pedal (eg., how far down from the pivot point the master cylinder pushrod is) going to a caliper with bigger and more pistons does not increase brake pressure. quite the opposite.
i was more concerned with deceleration g-forces being greater than what the algorithm in the abs ecu would expect. my math says that a 14" rotor isnt going to apply much more brake torque than a 13" rotor, but a 14" rotor and slicks combined with threshold braking might tickle something.
ShelbyGuy said:locking the brakes is a function of the tires, more than anything else. brakes dont stop the car, tires do.
LargeOrangeFont said:Agreed. My lock threshold went up tremendously after I put on the Kumho MXs. Granted I do not have some 100000 pistion brake setup, just the Cobra R Brembos. That is all 99.9% of us will ever need anyway.
Also, the ABS in this car does not modulate, it just lets go and then applies a constant pressure, usually until you have come to a complete stop. Normally when the ABS trips on the street for me, it is due to a dip in the road, road dot or reflector etc. I let off the brakes and reapply so the car will actually stop.
ShelbyGuy said:except the abs doesnt actually modulate anything. you make it sound as if its constantly varying pressure. all it does is release pressure to the wheel with the stopped exciter ring, then build pressure again so your pedal doesnt go to the floor.
locking the brakes is a function of the tires, more than anything else. brakes dont stop the car, tires do.
take your car out and lock up the brakes so you feel what it does. and doesnt do.
moridin2004 said:It does modulate. I'm just going to need a bit more time to explain, because I spent the whole day on planes getting out to Road America for the next race. I'll try to get something up later tonight.
ShelbyGuy said:you'll be at the generac 500 this weekend?
ShelbyGuy said:if i make it up, i'll probably go up saturday. much easier to get back in town (chicago) saturday night than sunday night.
here are my pics from 2004
http://nitro.vapornet.net/2004/ALMSRA500/