2.62 ? Your sure about that number? They usually go 3.25, 3.15, 2.95,2.75 etc with diff size crank pulleys and putting a smaller pulley on the blower over spins it faster to move more air . Remember boost is only a measure of restrictionSo I am wondering what the different pulley sizes are for increasing boost with these superchargers. I have just the stock crank and a 2.62 on the SC. Wondering which pulleys I need to make it blow more. And how it works relatively
First things first, which blower do you have specifically? And you want to measure outside diameter of the pulley not any of the ribs.Yea the caliper reads 2.62 when measured. I was told to measure the top of the rib not the outer edge. Was I mislead?
What kind of upgrades do you have done to the motor currently?I have the vortech v1 sc trim. Im a newb but Im assuming you mean what rpm do I check the boost at? I believe about 55-65. And the most boos the guage reads is 4 maybe 4.5. As for power i am not sure. I dont have a local spot to take it to.
Use the impeller speed calculator here to determine your current impeller speed Impeller Speed Calculators | Vortech Superchargers scroll to the bottom of the page where it says v1/v7 (they have the same internal step up ratio and use the same calculator) Your target impeller speed should be 58,000 rpms and I caution you from exceeding that. You will need your upper and lower pulley diameters and your maximum shift rpm (6,000? I'm guessing) see where you are and play with different pulley ratios until you get to the target rpm, this will let you figure the pulley combo to spin the blower as hard as you can while maintaining a reasonable efficiency level. I'm assuming that you are using a 6 rib setup? If that is the case you need to watch for belt slip and may want to consider an upgrade to either 8 rib or a better tensioner with the pulley change. Vortech offers an 8" lower crank pulley (8 or 10 rib only) that is a good option to stay away from really small upper pulleys. The smaller the upper pulley is the less belt wrap you have around the blower and the more likely it is to slip[/QUOTE
Use the impeller speed calculator here to determine your current impeller speed Impeller Speed Calculators | Vortech Superchargers scroll to the bottom of the page where it says v1/v7 (they have the same internal step up ratio and use the same calculator) Your target impeller speed should be 58,000 rpms and I caution you from exceeding that. You will need your upper and lower pulley diameters and your maximum shift rpm (6,000? I'm guessing) see where you are and play with different pulley ratios until you get to the target rpm, this will let you figure the pulley combo to spin the blower as hard as you can while maintaining a reasonable efficiency level. I'm assuming that you are using a 6 rib setup? If that is the case you need to watch for belt slip and may want to consider an upgrade to either 8 rib or a better tensioner with the pulley change. Vortech offers an 8" lower crank pulley (8 or 10 rib only) that is a good option to stay away from really small upper pulleys. The smaller the upper pulley is the less belt wrap you have around the blower and the more likely it is to slip
Ok so when I use the 6k shift it looks like an 8 inch crank and a 2.85 inch upper pluuley puts me just over 58105.26. I guess I need to get this thing back on the road and really watch my shift points when on it?
58,000 rpm is not the gospel but is where they rate the blower as far as impeller speed. If you spun this thing 2k rpms over it isn't the end of the world it just lessons the longevity of the blower (and not by much, its where the bearings are rated) If you were to shift right on the rev limiter (6250rpm) you would see an impeller speed of 60526.32 with the above mentioned pulleys and that is reasonable in my book. If yo decide on a new top end and spin this thing this hard you have the potential to make serious HP so make sure the rest of the supporting components are up to par as well. Do you currently have a bypass valve on the discharge piping? If not you will want to install one if you plan on making more than 6 lbs of boost to prevent any compressor surgek so when I use the 6k shift it looks like an 8 inch crank and a 2.85 inch upper pluuley puts me just over 58105.26. I guess I need to get this thing back on the road and really watch my shift points when on it?
58,000 rpm is not the gospel but is where they rate the blower as far as impeller speed. If you spun this thing 2k rpms over it isn't the end of the world it just lessons the longevity of the blower (and not by much, its where the bearings are rated) If you were to shift right on the rev limiter (6250rpm) you would see an impeller speed of 60526.32 with the above mentioned pulleys and that is reasonable in my book. If yo decide on a new top end and spin this thing this hard you have the potential to make serious HP so make sure the rest of the supporting components are up to par as well. Do you currently have a bypass valve on the discharge piping? If not you will want to install one if you plan on making more than 6 lbs of boost to prevent any compressor surge
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