Originally Posted by
rmcdaniel12
I've come to "my own conclusion" that stacked pulleys are not made for a 11 second street car. and i also believe that i am accurate in saying that 94% SRT6 owners are NOT dedicated to the drag strip but rather enjoy driving their SRT6 down the street but when approaching any Porsche or SRT8, say "yea im bout to spank that a**". Having said that, i find it VERY hard to believe that the select FEW that are running stacked pulleys (with stock injectors at that!!) dont even go above the posted speed limits, but just like being able to say that they are running stacked pulleys. Im willing to put all chips in saying that stacked pulleys are almost next to impossible to have (on our cars atleast) for a "street car". Its easy to build a drag car. The hardest thing to build is a street car. I believe that if those few that have stacked pulleys ran their car the way the mods were intended to be ran, they might encounter something catastrophic. Otherwise, whats the point?? De-mod and run the car with enjoyment!!!
JR, I have read this thread and especially your post, many times. Exactly what were you trying to achieve? It took me nearly a year to get to where I was satisified with my stacked pulleys, 178/70. I started with a 65mm SC pulley and loved it. As you recall I bought th 178mm crank pulley from you. Research shoiwed the SC we have does not like to rev beyond 15,000rpm when dividing the crank diameter by the SC pulley diameter multiplied by the max engine RPM. Of course the SC rollers spin up to 3 times that of the number we get doing the math.
This is when I looked at Jefasolds 70mm sC pulley. Jim had that nailed a little past the 15,000rpm number but not crazy like doing a 178/65 combo which yields 16,978RPM at our motors 6200rpm redline. Trying to do that combo creates a lot of work with questionable gains.
JR, I agree with you that the car should be done in a manner that makes driving it a pleasure and not a call to AAA!
If you are trying to run a 178mm crank pulley or larger AND A 65MM SC pulley the fun is gone in place of frequent AAA calls! I have only addressed the stacked pulleys here but there are bother mods that do not return much on the dollar. Exhaust is one and once again Jim has a good idea with a "Y" pipe and a large single pipe to keep the unbalanced exhaust pulses from slowing the car. I am going with a combo of a Magnaflow TRU X-pipe internal with a "Y" pipe after the X-pipe muffler leading into a large 3" pipe back to a 3" in/out Borla to complete the system. Still room for Rob's log headers should they come about. After a year I have few mods at all but the returns have been good due to research and asking questions from guys like Tim who have been there and done that!