Re: 5kCSTQ boost Q (fwd)

[orin@netcom.com (Orin Eman)]

> 
> In message <199608261852.LAA28924@netcom2.netcom.com> Orin Eman writes:
> 
> > 5th gear, WOT, 2500rpm plus.  The boost built up and kept building up to
> > 10psi at which point I did hit the fool pump cutoff.
> > 
> > Everything is fine on the 3rd gear 35 to 55mph test.  Anyone know if lower
> > rpm behavior is different?
> 
> It shouldn't be.
> 
> a) Has the car been "chipped"?

I don't think so.  It's time to open up the computer and find out.

>  
> b) How warm was the engine - i.e., how _recently_ had it warmed up?
>    Had it just reached a reasonable operating temperature, or had you been 
>    driving for a while?  I ask because several MB owners (in fact, all 
>    who've tried it) have been able to demonstrate an overboost window
>    just as the engine reaches operating temperature.  Myself, John
>    Robinson and Steve Evans have all been able to reproduce this problem.
>    We suspect an ECU map bug.  In fact, if anyone feels like mistreating
>    their car just once by hitting the loud pedal _HARD_ just before the
>    "N" symbol is reached on the water temperature gauge, we might see if
>    this is common to more than one design.  It happens in all gears.

Hot.  No difference with temperature that I've noticed.

> c) Are the small-diameter wastegate control hoses, to and from the 
>    overboost control valve, frayed internally at the ends?  Sometimes the
>    rubber perishes through inside the fabric - if you cut the last 1/2"
>    off the hose, you'll find a fretwork inside.  Sometimes they chafe
>    through on things like cable ties.

I'm thinking maybe I squished the one from the turbo inlet when I 
had it off on Sunday.  I'm going to check it out later.

Orin