Originally Posted by MD SRT6
OK alot of you will dismiss this as crazy, but my theory on the pulleys is 178mm is perfect. Any larger and you start to reduce power. There have been some company's promoting the other sizes and showed some higher boost levels, But no one including myself to date anyway has benefitted on the track from them. I believe the trade off between the extra heat etc.. reduces power. Renntech and evosport etc whom are large companies with big budgets have studied this, what is safe and produces peak power. I ran 12.08 on the 178mm pulley and have not done any better with the 181mm with all the same parameters. In fact I've been slower and yes I have adjusted tune for it. That is why I started the 178/181/185 thread. Anyone who has run faster than a car with a 178mm pulley on a 1/4 mile track with a 181 or 185 please chime in!
I don't think you are crazy at all, I think you make a good point. There has got to be a point that your boost levels are going to cause excessive heat and a good ECU tune (safe) is going to start dumping fuel causing you to run rich and loose HP. I said to the guy that just done the dyno on my car, "going from a 178 to a 181 pulley really wouldn't make that much difference in boost would it"? He told me I would be suprized how much more boost the 181 pulley would make compared to the 178. You know there has to be a reason why one of the bigger companies didn't try to out do another by going to a larger pulley.