99FLHRCI Posted August 28, 2010 Report Share Posted August 28, 2010 Ok so I am running a C-1 from ATI. Volute Diameter 7" Max Supercharged HP 675 Base HP Range of Motor 150-325 (Naturally Aspirated) Max Flow (cfm) 1000 Max boost (psi) 24 Inlet Hose Diameter 3.5" Inducer Diameter 2.75" Exducer Diameter 4.25" Outlet Hose Diameter 2.5" Outlet I.D. 2.12 Max Impeller RPM 80,000 Internal Step-up 4.70:1 Reverse Rotation Yes Available Self Contained Yes Oil Capacity 3 oz I currently have a 3.65" S/C pulley and a 5.38" crank pulley. This results in my having 7 psi of boost at 8700 rpm. I am looking at putting a 6.36" crank pulley on. Is there a way to semi-accurately estimate how much boost I will be making? Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted August 28, 2010 Report Share Posted August 28, 2010 6.36"/5.38" = 1.18 7psi x 1.18 = 8.26psi Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted August 28, 2010 Author Report Share Posted August 28, 2010 Wow. That makes it sound like it isn't even worth it. Quote Link to comment Share on other sites More sharing options...
Fubar231 Posted August 28, 2010 Report Share Posted August 28, 2010 get a custom sc pulley? Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted August 28, 2010 Author Report Share Posted August 28, 2010 I dunno if I can go smaller. I am currently running the smallest pulley you can get from ATI. I will have to take the SC in somewhere and see what they can do. Quote Link to comment Share on other sites More sharing options...
Fubar231 Posted August 28, 2010 Report Share Posted August 28, 2010 I dunno if I can go smaller. I am currently running the smallest pulley you can get from ATI. I will have to take the SC in somewhere and see what they can do. Cant you take the pulley off the back, and get one CNC'd or something? Im sure making the sc pulley smaller will work alot better than making the crank pulley smaller. Quote Link to comment Share on other sites More sharing options...
unfunnyryan Posted August 28, 2010 Report Share Posted August 28, 2010 10.8psi, according to the spreadsheet I used (and assuming I got the information on your car and supercharger correct) Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted August 29, 2010 Report Share Posted August 29, 2010 10.8psi, according to the spreadsheet I used (and assuming I got the information on your car and supercharger correct) Do you have a copy of this spreadsheet? Quote Link to comment Share on other sites More sharing options...
unfunnyryan Posted August 29, 2010 Report Share Posted August 29, 2010 Do you have a copy of this spreadsheet? http://www.modularfords.com/forums/attachment.php?attachmentid=47237&d=1205004734 Quote Link to comment Share on other sites More sharing options...
neonkiller Posted August 29, 2010 Report Share Posted August 29, 2010 sell your car buy a ls1 car , profit and be reliable. Quote Link to comment Share on other sites More sharing options...
99FLHRCI Posted August 29, 2010 Author Report Share Posted August 29, 2010 sell your car buy a ls1 car , profit and be reliable. I wish I could find an LS1 car with 125k, gets 25+ mpg and is half as fun to drive. Oh and as far as reliable, its stock internals, stock clutch. I doubt there are many if any LS1 that fit those requirements. Quote Link to comment Share on other sites More sharing options...
mrtbolt64 Posted August 29, 2010 Report Share Posted August 29, 2010 60270 rpm currently 71249 if you go to the 6.36 crank pulley for impellar speed and assuming no belt slip. Belt wrap is very important here so go with the bigger crank pulley. Just an opinion but I think an extra 11000 of rpm of the impellar would be worth atleast 3 to 4 psi Quote Link to comment Share on other sites More sharing options...
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