manual boost controllers, and ECU functions

[Wallace White]

isham-research.freeserve.co.uk at pop.pol.net.uk wrote:

> >> Another question, would an SJM chip affect how quickly target
> >> boost is reached?
> 
> > I doubt it, becasue a stock ECU should do this:
> 
> A chipped ECU reaches target boost slower than an unchipped one - the
> inertia of the turbo is unchanged and it has to spin up further.  The
> stiffer spring means you reach the previous maximum more quickly, but
> it takes a little while longer to get to the top.

This is very true--when I put in a 1.6 bar Charlie Smith spring, the
difference in throttle response at low pressures was very noticeable.
Maybe my stock spring had gotten a little soft, but I don't think it was
staying shut up to ~1.2 bar like I think it's supposed to.

- Wallace
  '87 5kcstq 169k