Throttle bodies and brake rotor temperature equations

[Q45tech]

Some research indicates that a 75mm TB will flow 390 cfm with a 5" H20 restriction and an 85mm TB will flow 558 cfm under same restriction.

A 274 ci Q45 engine consumes air depending on rpm and VE of entire intake and exhaust restriction .

274/2= 137 x rpm x ve / 1728 to create CFM so 137 x 6,000 x 0.85 /1728 http://uk.geocities.com/stefan...1.xls

For the pressure drop cell you MUST include all the restriction before the TB.: air duct, Housing, air filter, MAF, flextube to TB, etc.21/28= 0.75 is a good number to use

[Q45tech]

http://scialert.net/qredirect....d=pdfh ... al-ihm.pdf

Rotor composition and cracking:http://www.mitsubishi-motors.c...6.pdf

"Obviously, these numbers were going to piss on StopTech's parade and ours. Even though the big brakes were far superior in terms of rotor temperatures, pedal feel and modulation, the longer-than-stock stopping distances would undoubtedly raise some questions as to the validity of spending several thousand dollars on an upgrade."

"In the real world, brake engineering and balance isn't just about how fast you can stop. Brake engineers and OEMs know this, and it's the last piece of the puzzle we didn't get to test between the three set-ups. Often ignored in the aftermarket, braking stability in a turning/braking situation plays a critical role.

The Society of Automotive Engineers (SAE) has a set procedure and protocol for this. Essentially, the test measures how a car behaves and where it ends up when the brakes are fully applied when circling a skidpad at its limits. A car with more rear bias will rotate and end up well inside the original line of travel, while a car with too much front bias will push well outside the skidpad. Maintaining a balance that allows the driver to keep going where the front wheels are pointing is critical and is also one of the factors behind StopTech using less-than-optimal rear bias in order to keep the car on line.http://www.modified.com/roadte....html

http://www.wsdot.wa.gov/resear...1.pdf

http://www.mscsoftware.com/sup...5.pdf

http://books.google.com/books?...num=8

[maxnix]

Why just putting bigger rotors with harder pads (what is effect on swept area?) with stock MC and rear pads and rotors is not necessarily a good solution nor an "upgrade." The whole system has to be designed to mimic OEM front to rear bias and pad compatibility. High speed high temperature pads never work as well in real world initial cold stops as OEM pads.

Tough to get a real world benefit from a$10K brake upgrade if you don't drive at extralegal speeds, in steep mountains, or on the autocross course. And if you don't design it right, it will be much worse.

[paranoidjack]

Why just putting bigger rotors with harder pads (what is effect on swept area?) with stock MC and rear pads and rotors is not necessarily a good solution nor an "upgrade." The whole system has to be designed to mimic OEM front to rear bias and pad compatibility. High speed high temperature pads never work as well in real world initial cold stops as OEM pads.

Tough to get a real world benefit from a$10K brake upgrade if you don't drive at extralegal speeds, in steep mountains, or on the autocross course. And if you don't design it right, it will be much worse.

Frankly, the more I learn about these little magic formulas etc that Tech puts out, it seems the better engineered the car, the less likely one CAN modify it favorably with one upgrade. Seems that one will always call for 5 more to compensate, which makes sense. Why I've given up on entertaining much other than stock components to ensure my baby gets to 300k.

Had someone yesterday ask what year my car was, and thought there was like 30-40k on the odo....quite suprised to see over 180k!

[Q45tech]

Weight of C5 Corvette OEM Brake PartsTotal Weight: 87.4lb

Front Rotor = 17.50lbRear Rotor = 13.25lbFront Caliber = 8.10lbRear Caliber = 4.85lb

Weight of the 2005-2007 Corvette Z06 OEM Brake PartsTotal Weight: 126.4lb

Front Rotor = 25.95lbRear Rotor = 19.90lbFront Caliber = 9.10lbRear Caliber = 8.25lb

All things being equal the front and rear rotors on Z06 would be ~~ 30% cooler for the exact same stop.