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    1. 02-10-2012, 02:11 PM #1
      ephatchback
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      3.8 pully from 4"..will i need to change belt?

      ive seen this posted before but ive been looking for that post for a while and cant find it..if im running a gen 1 jrsc 4"(5psi)pully and want to install the 3.8" pully will i need to get a shorter belt, or will the autotensioner be able to compensate? ive also considered putting a larger pully on my tensioner to make up for the smaller blower pully but i didnt know if that would effect the boost? if i put a smaller blower pully on and then put a bigger tensioner pully on will they cancell each other out? lol seems possible..if the crank pully can have and effect on boost then why wouldnt the tensioner? anyway thanks for the help..thanks- joep
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    2. 02-10-2012, 03:41 PM #2
      Ba82Ep3
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      You will need KPRO...
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    3. 02-10-2012, 03:58 PM #3
      gtolio
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      Quote Originally Posted by Ba82Ep3 View Post
      You will need KPRO...
      And many LOLs ensued...
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    4. 02-10-2012, 05:36 PM #4
      Ba82Ep3
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      Quote Originally Posted by gtolio View Post
      And many LOLs ensued...


      I just couldnt resist...
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    5. 02-10-2012, 05:38 PM #5
      Ba82Ep3
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      You can use the manual tensioner with the 3.8... i recommend getting the 2.5" RSX JRSC tensioner pully from MOSS MOTORS if you plan to stay with the manual tensioner. If youre willing to do that you might as well modify your OE auto tensioner and get a shorter belt.
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    6. 02-10-2012, 06:01 PM #6
      ephatchback
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      cool
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    7. 02-10-2012, 04:19 PM #7
      ephatchback
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      Quote Originally Posted by Ba82Ep3 View Post
      You will need KPRO...
      im getting kpro..as soon as i do im putting in my rc440s and 3.8 pully..all i need to know is do i need a smaller belt since the pullys arent the same size? or will my autotensioner have enough room to comp for .2" smaller pully? i realise ive been all over the boards lately with alot of stupid questions about stock ecu boost and powercards lol but you guys have been a great source of knowledge and i appreciate it..i remember someone mentioning they used a bigger tensioner pully to compensate for the smaller blower pully..i just want to know how all that works..thanks -joep
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    8. 02-10-2012, 05:11 PM #8
      gamma6
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      Quit making ur life harder and just get a smaller belt to compensate for the smaller pulley, if u want more boost then get the k24 crank pulley (of course ull need tobchange the belt)
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    9. 03-09-2012, 03:55 PM #9
      AttarixEp
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      I believe take 1/2in off the size you have now. Pretty sure that's what I did
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    10. 03-11-2012, 07:34 PM #10
      ephatchback
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      Quote Originally Posted by AttarixEp View Post
      I believe take 1/2in off the size you have now. Pretty sure that's what I did
      the pully on my jrsc says 4" on the side..and my boost guage is pegging out at 5psi.
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    11. 03-11-2012, 07:36 PM #11
      ephatchback
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      im about to throw my ac pully on my crank an blow the whole thing up lol
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