USA F40 wastegate:internal machining modification | FerrariChat

USA F40 wastegate:internal machining modification

Discussion in '288GTO/F40/F50/Enzo/LaFerrari' started by 335s, Aug 28, 2017.

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  1. 335s

    335s Formula Junior

    Jan 17, 2007
    870
    SF Bay Area
    Full Name:
    T. Monma
    #1 335s, Aug 28, 2017
    Twenty plus years ago, there was a sheet floating around (from Michellotto???), which was a ROUGH dimensional blueprint showing exactly where(after CAREFUL dis-assembly), and HOW much to machine off of specific shoulders to allow for a faster rate of bleed off in the wastegate to compensate for loss of backpressure from EITHER stock exhaust removal-AND, cat removal(for TRACK use ONLY).
    This eliminated the overboost symptoms found in US spec cars when warm-but not yet fully HOT...

    Did it twice, but been so long I can't remember
    Does anybody have a copy of these diagrams/specs/dimensions-or just the raw data?

    Thanks in advance
     

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