Given my recent dealings with the only 3 partial sources I could find for calculating boost and Supercharger RPM, I thought it'd be a good idea to have a Pulley calculator instead of having to resort to un-interactive tables. I wasn't able to find one using the search on this forum or Google so I did my best to make one. I couldn't embed it here for some reason so the link is below.
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I completely agree that there are far too many variables to accurately predict actual Boost level. Its meant more as an easy way to quickly put a pulley combination together. If I can get the Boost to match the general consensus regarding pulley combination and ballpark PSI, then I think it could be a nice bonus.
You're right about that. But I think what turned me off about his chart is that he lists only 2 popular options (2.50, 2.40) with the stock Crank pulley when there are at-least 5 popular choices from what I've gathered (2.38, 2.40, 2.45, 2.50, 2.55). I know it's minimal, but that extra 0.05 could mean the difference between life and death for the stock cats.
I finally played around with it today, and I have to say it's a pretty cool little calculator. Definitely takes the work out of hunting all over the place for text that half explains what you have here.
I'm sorry, but the pulley ratio and blower speed are very simple calculations, but if you're going to do a configurator, I would suggest fields that include upper and lower idlers, as well as with and without relocation brackets, to determine belt length.
Boost level is not able to be calculated; at best, it can be estimated, but as mentioned, so many variables I think it would be misleading at best.
Any chance to update this calculator to go to 6.70" since a lot of guys are doing LSA blowers on LS3 cars and using the LS3 serpentine system. So the lower pulley is anywhere from 6.78" (10% UD from ATI) to 7.48" which is the stock size crank pulley. Also this is an awesome calculator for those of us new to doing all the math, thanks in advance.
This is a great idea! I tried to update my calculator but it looks like my 30-Day trial ended 2 years ago so I won't be able to add it. I was however, able to create a new one. See below...
Crank pulley Dia/Blower Pulley Dia=Ratio x Engine RPM at shift
9.17/2.50= 3.668 x 6700= 24575.6 blower rpm
That took less time then opening Excel
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