blower ?

Discussion in 'PSI Superchargers Tech Questions' started by fasttimesracing, Jun 14, 2008.

  1. fasttimesracing

    fasttimesracing Member

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    i have a ssi f roter that i bought from a guy that ran promod out west. the blower has had all the mods done to it before i got it and was fresh. it makes 38lbs boost on my 540. here is what i need to know. it was brought to my attetion today that i took a spacer out of the top of the blower that made the top opening 9.5 instead of i think 10.5. anyway it makes the top shorter. what would it do if the was put back in the blower? did i make a mistake by taking it out?how will it make my motor run ? more bottom or topend
     
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    fasttimesracing, Jun 14, 2008
  2. Mike Canter

    Mike Canter Top Dragster
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    According to Rich at SSI putting the spacer in will increase boost but will lessen CFM. This really helps if you are running low OD. As far as the high OD's it appears that it is another combination that may or may not help depending on the car setup. The recommendation would be to try it and see if it changes the performance of the car. Make sure you use Locktite on those bolts that hold it in. If it comes loose it will be spectacular.
     
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    Mike Canter, Jun 14, 2008
  3. craig moss

    craig moss Member

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    blower

    I am glad you ask I have no Idea but have wondered these things are well kept secrets at least for a guy like me I would also like to know what the f stands for and some of the other letters they talk about I have heard that the shoes are in there for lower or higher overdrive but do not know for sure thanks Craig :confused::confused:
     
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    craig moss, Jun 14, 2008
  4. craig moss

    craig moss Member

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    I was typing and when I submitted mine you beat me by one minute thanks craig
     
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    craig moss, Jun 14, 2008
  5. fasttimesracing

    fasttimesracing Member

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    i dont really want to over drive it more at this point. it at 35 over. and i have dart 345 water heads on the motor. i do mud drags with it and run it less that 2.5 secs a pass.
     
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    fasttimesracing, Jun 14, 2008
  6. WJ Birmingham

    WJ Birmingham New Member

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    SSI told me on my 14-71 B-Rotor, anything under 30%, run both shoes (9.5" opening). 30%+ on Alky, run 1 shoe (10.5" opening).

    Running nitro... Take them all out (11.5" opening).

    They said the more shoes that are in the blower, the quicker it builds boost, but with a lot of OD it can restrict top end CFM (as Mike Canter stated).
     
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    WJ Birmingham, Jun 15, 2008
  7. fasttimesracing

    fasttimesracing Member

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    so with that it sounds like i should put it back in right?it will not build more but faster correct? the most ill go is maybe 40 over but dont see that happening right now
     
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    fasttimesracing, Jun 15, 2008
  8. Mike Canter

    Mike Canter Top Dragster
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    That is hard to say. Since you now have a baseline performance with it out then I would try it with it in and see what happens. It will probably take a few runs to see the difference since the fuel tuneup will have to be changed to match it. I would be interested in knowing the outcome. After you tried it please email me at mike.c@mindspring.com and let me know what happened.
     
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    Mike Canter, Jun 15, 2008

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