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Re: To all Charlie Smith spring users
You're right about it being a bleed valve. I asked when I saw the first
post. If it had been a true regulator, I would have questioned its ability
to preserve the overboost protection.
>> Whisper air control valve by Second Nature (single) #56001 $3.39
>Yesterday afternoon, I bought one of these at the local Petsmart and rigged
>up my own testing system to check it out ... turns out that it's not really
>a regulator but merely a control valve. As such, it doesn't clamp pressure
>at a given point but bleeds off a fixed percentage. This effectively means
>the more boost you have, the more timing advance (or less retard, depending
>on how you look at it) you'll get, which sounds backwards to me.
I think this mod is analogous to using a resistive bridge to scale the
output of the transducer. In this case, the bleed valve is scaling the
input to the transducer. I would expect this approach would provide a more
aggressive advance curve, with more power but less reserve against
detonation. See the earlier discussion regarding the bridge vs the Zener
>Has anyone else looked into this yet or have I overlooked something here?
> _ _
> / l l o l \ l o Jeffrey Goggin
> /__l l l / l l l l l l / l l * * * * * * *
> / l l_l \_l l l__/ l_l \_l l AudiDudi@delphi.com
San Jose, California
'87 560 SL