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Herb

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Posts posted by Herb

  1. Has anyone upgraded from a journal bearing to ball bearing turbo?  If so, maybe you can answers some of these questions:

     

    1.  How much faster is the spool time?  500rpm, 1000rpm or not noticeable?

     

    2.  Is the max HP actually higher with the exact same turbo but has the ball bearings in them?

     

    3.  When down shifting, does the B.B. Turbo respond faster?

     

    4.  Is it worth spending the extra $500 or more for a B.B. Turbo?

     

    Thanks

  2. So I am swapping in an L28Turbo with an upgraded T3/T4, p79 A-Grind Cam, p90 Head with dished pistons, Megasquirt, larger injectors, etc...  I know the compression starts at around 7.4 for turbo motors and the N/A motors are around the mid 8's.  My buddy has a 76 280z with a stage 2 cam and exhaust and runs 87 octane with no problems.  So my questions are:

     

    1.  With this turbo set up, can I run 91 octane or lower?  I had 2 turbo cars already, 90 VW Corrado and 1999 Audi A4, I always had to run 91 octane.

    2.  Is there an amount of boost where 91 octane will not work anymore?  The turbo I have says 18psi max, but I don't plan on putting it that high, maybe around 15psi for weekend driving and 10psi for daily driving.

     

    Any info would be great.  Thanks

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