Tame my 4-speed Stroker....

yellow rose said
Again, the RULE say they MUST run a diaphragm PP. two totally different situations.

You have a funny way about you Grant. At least be honest and up front about what the rules are and how it works.

I don't know of a single example of someone, who CAN use an adjustable PP and sintered iron disc going away from that to a diaphragm PP. That may be the case, but I doubt it. There is zero to gain and way too much to loose.

This is why I have issues telling people to use your stuff. Be honest about why things are the way they are. The Coyote people (the cats who make the rules) are dead set against opening up the clutch rules to allow anything other than the diaphragm PP. I have my thoughts on why that is, but some have told me the company line is they want the cars as close to showroom as possible.

Ok. Whatever.

At any rate, anymore it's easier to tell people to buy the CT and let them bandaid a junk clutch than try to educate them about proper clutch load and application.

Two different worlds.

My post was in response to your...

"I don't know anyone running a rag disc any more. You see, you haven't learned enough yet to understand why an adjustable PP and sintered iron disc is a better way of doing it."

I was pointing out that some people do still run rag discs and are competitive. I used the Coyote class as an example because there is no other class out there where the cars are all basically the same and they all have exactly the same power to work with. All have the same engines, same weight, same tune, same transmissions, same fuel. As far as winning races at their power level, either organic or sintered iron can get the job done.

As for comparing this diaphragm class to other classes that do allow adjustable clutches, I use the old 1320/mph=ET formula to compare relative efficiency. If you know of a better rule of thumb to compare relative efficiency, please let me know. I basically compare how much above or below the formula's prediction the car might be running for a given power/weight ratio. The competitive Coyote car ET is typically within a tenth + or - of the formula. Apply the formula to NHRA class records for cars running around the same 130mph power/weight ratio, their state of the art clutches fare about the same.

Grant