Re: Indy pop-off valves

[STEADIRIC@aol.com]

>There are no pop off valves commonly available for production motors.....
> Wastegate failure I find hard to believe, it is a mechanical system, but
>let's explore.....  The computer should retard timing, then/and/or ground
the
>fuel pump if you go beyond the safe operation of boost, a pop off valve is a
>redundancy not needed.....  Look at what would give you overboost mode,
>graydon, only a faulty WG freq valve or a mechanical malfunction of the
>spring (how, not sure) would do that, and your ECU should take over and
>ground the fuel pump .....  I suppose you could mount an additional modified
>wastegate that functions as a pop off, but the why question arises......
>  And if you are relying on that pop off valve to work, you will already
have
>turbo failure on an audi, cuz when it pops, there is nothing to slow the
>turbo down, in fact you will speed it to oblivion (means wastegate failure
>and CPU shutoff failure - your spinning big time baby).....
>
>I told you dave, this wasn't worth mentioning....   
>
>Scott
>
>Wastegate = good
>Pop off = bad (downstream of t-body)


I seem to remember giving someone a "techie" race mag that had a HUGE 
story on just this topic......  (Big F**kin grin on my face.....Scott!) 
That woul'nt have been at Gratten now would it???

Later!


Eric Fletcher
'87 5KCSTQIA2RSR2B

STEADIRIC@aol.com