Vortech 9lb pulley??
09-12-2004, 11:05 AM
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Vortech 9lb pulley??
Where can you buy this pulley? Lots of gains have been shown from switching to 3.12 pulley, 34tooth cog pulley and 9lb pulley. Are 2 of these pulleys the same? Little confused here from lack of knowledge. Please help.
09-13-2004, 04:43 PM
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Vortech part #4gr033-034 pulley,sc,c5,20mm,34t. Thats what it says on the po. Call them direct. I havn't installed them yet waiting 4 APS plenum to come out. I had a crawford but the seller backed out.
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09-14-2004, 10:32 AM
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Vortech part #4gr033-034 pulley,sc,c5,20mm,34t. Thats what it says on the po. Call them direct. I havn't installed them yet waiting 4 APS plenum to come out. I had a crawford but the seller backed out.
You can go to a 34-tooth pulley in a 50mm thickness. I believe this is what others have installed (based on comments about clearance issues) and it is what I have but yet to install.
Please verify... because if what you say is true, the 20mm pulley would be a better solution if a belt of the proper width could be obtained.
09-14-2004, 10:47 AM
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I am reading what is on my po. I ordered from Vortech,the salesman was Brian Ellis. He was very helpful i explaned what car it was for. Give me a few min. I'll call them(Vortech)
09-14-2004, 11:08 AM
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Okay just got off the phone with Vortech.I spoke with Brian Ellis he refered me to there account rep his name is DJ. DJ said the part # 2A036-312 (9lb) pulley. But they said the 34 tooth cog pulley would'nt work for our application!(4GR033-34) it would slow down the blower. Maybe some miss communication on the cog pulley or jack saft pulley! Need some help here.
09-14-2004, 11:27 AM
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I guess the guys at Vortech don't really want to help on this matter because they don't want to be liable. I think i have the right pulley (34 tooth). Do we need to change the belt to? Wish i could put these on and get tuned. Need to put on DC headers and get a plenum. I had bought one on this forum but the buyer backed out.
09-14-2004, 11:51 AM
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booger is dead-on. I don't have the manual in front of me, but if I recall correctly the stock kit comes with a 32-tooth pulley on the jack shaft and a 28-tooth pulley on the actual supercharger.
As is the rule with any pulley mechanism, the bigger the drive pulley and the smaller the idler pulley, the faster the final rotation will be. So, in our terms, the more teeth we have on the jack shaft pulley and the fewer teeth on the SC pulley, the faster the SC will spin. Smaller on the jackshaft and bigger on the SC pulley will actually slow the SC down.
So, 34 teeth on the jack shaft pulley is good (34>32), 34 teeth on the supercharger pulley is bad (34>28). Sounds like they sent you the wrong pulley, daddyz.
When I was researching what to buy, I found 6 Vortech pulleys that could be beneficial to our application.
1 jackshaft drive pulley > 32 teeth (@ 34 teeth)
4 Serpentine idler pulleys < 3.33" (@ 3.25", 3.125", 2.87", and 2.62"
1 Supercharger idler pulley <28 teeth (@ 27 teeth)
Any of these pulleys should work to increase total boost and how quickly the SC hits max boost by spinning the SC faster. If you use the Vortech SC calculator, you can actually estimate how much faster you can spin their unit. Again, I don't have it in front of me, but I seem to recall if you were to go 32-tooth jackshaft, 27-tooth SC, AND 2.62" serpentine, it effectively spins the SC about 40% faster. You can then look at Vortech's flow chart to determine how much boost that is exactly. My estimates put it around 13lbs total if you went that aggressive.
I skipped on the 2.62" myself because I figured it would introduce more belt slip than I would like and because it probably is too much boost without a bottom end build. When finished, I will have the 34-tooth jackshaft pulley and 2.87" serpentine.
As is the rule with any pulley mechanism, the bigger the drive pulley and the smaller the idler pulley, the faster the final rotation will be. So, in our terms, the more teeth we have on the jack shaft pulley and the fewer teeth on the SC pulley, the faster the SC will spin. Smaller on the jackshaft and bigger on the SC pulley will actually slow the SC down.
So, 34 teeth on the jack shaft pulley is good (34>32), 34 teeth on the supercharger pulley is bad (34>28). Sounds like they sent you the wrong pulley, daddyz.
When I was researching what to buy, I found 6 Vortech pulleys that could be beneficial to our application.
1 jackshaft drive pulley > 32 teeth (@ 34 teeth)
4 Serpentine idler pulleys < 3.33" (@ 3.25", 3.125", 2.87", and 2.62"
1 Supercharger idler pulley <28 teeth (@ 27 teeth)
Any of these pulleys should work to increase total boost and how quickly the SC hits max boost by spinning the SC faster. If you use the Vortech SC calculator, you can actually estimate how much faster you can spin their unit. Again, I don't have it in front of me, but I seem to recall if you were to go 32-tooth jackshaft, 27-tooth SC, AND 2.62" serpentine, it effectively spins the SC about 40% faster. You can then look at Vortech's flow chart to determine how much boost that is exactly. My estimates put it around 13lbs total if you went that aggressive.
I skipped on the 2.62" myself because I figured it would introduce more belt slip than I would like and because it probably is too much boost without a bottom end build. When finished, I will have the 34-tooth jackshaft pulley and 2.87" serpentine.
09-14-2004, 11:58 AM
#18
yeah i put the numbers in that formula and found that with the 3.12 serp and the 34 cog the blower wouldnt be maxed out like had been said previously, i think even at 6800 which i dont hit, the revs were like 54000 which is right at max, so that would be perfect, so now i just need to find the right cog pulley.
and no you shouldnt need a new cog belt, just tighten the tensioner down a little more to take up the slack.
and no you shouldnt need a new cog belt, just tighten the tensioner down a little more to take up the slack.
09-14-2004, 12:46 PM
#19
Dont go with a 2.87 serp pulley...Ive tried it......it's to small...I just put it on and didnt check it..figured it would work with no problems....Wrong....the pulley is to small and it ground off the outter edge of the jackshaft assembly. I did have the pulley milled to fit...but decided against it after I put on new cats and got 9.5psi with the 3.12...only had 7.6psi with the 3.12 and no cats. wish I would have put it on before the new cats went on