Originally Posted by 240M3SRT
I bought a 181 and it seems to have yielded similar results to my 185. With my 185 i could immediately jump Brian(BDJ's Racing) by 1-1.5 cars, but he would always start pulling back at around 120mph or so. He has similar mods and a code 3 pulley. Then i swapped to the code 3 pulley and we were dead even. Now i have the 181 and its the exact same thing, i pull an instant 1-1.5 car lenghts then at 120mph or so he starts to reel me in. We always start from a 50mph 2nd gear punch, we have the "ready-set-go" down to an art, so all is fair. The 1/4 mile is over by 120mph so the crank pulley is definitely superior to the code 3 for 1/4 mile times, but id still like to know whats happening here. Why does the crank pulley peter out at top end while the code 3 keeps pulling strong?
First i would like to ask other members to try and duplicate my findings. I always assumed that the bigger crank pulley created higher IAT's at the top end than the code 3, or that maybe the ecu was pulling timing. I am no longer so sure of this. BTW, AFR is fine as all this occurs.
That is interesting I would have thought there would be more of a difference than 1 to 1.5 car lengths with the 185 pulley. Of course there are so many other variables such as supporting mods, what tune each car was running and from who, how sticky and the weight of the tires, wheel weight and so on. That is definately interesting information though, thanks.