We will need the same displacement/same # of cylinders when Audi comes out
with the S4 Twin turbo
On Tuesday, June 22, 1999 11:46 AM, dg50@daimlerchrysler.com
[SMTP:dg50@daimlerchrysler.com] wrote:
>
>
>
> dg50@daimlerchrysler.com wrote:
> >> Here's my proposed wording:
> >>
> >> - Turbocharger units may not ported, clipped, or otherwise modified
> >> from stock.
> >>
> >> - Turbochargers may be updated/backdated, provided that:
> >> - the donator and target car were both turbocharged
> >> - the displacement of the engine in both donor and target are
> >> exactly the same
> >> - the configuration and number of cylinders of the engine in both
> >> donor and target are exactly the same
> >> - that oil and coolant lines use the stock source and/or return
> >> points
> >>
> >> - Twin turbocharger units and their associated control hardware must
> >> be updated/backdated as a complete unit; Individual turbochargers
> >> may not be separated out, nor may single turbochargers be combined
> >> to provide a twin turbocharger configuration.
>
> > If your motor was
> > turbocharged from the factory, you can use the turbo unit(s) from any
> > other turbocharged engine on the same line (the same line thing is
> > already covered in the rule describing update/backdate). Why make the
> > big deal about "exactly the same displacement and configuration"?
> > Are there any lines in SP that have a four-cylinder turbo motor *and*
> > a six-cylinder turbo motor? If so, is it better to complicate the rule,
> > or to split those lines?
>
> I don't _think_ there's any cars out there where you have (say) a 4cyl
turbo and
> a 6cyl turbo (or even an 8!) on the same line, but that's not proof
against it
> in the future.
>
> My assumption is that the turbo would be matched to the flow capacity of
the
> engine on a given factory design, so that allowing the 4cyl's turbo on an
8, or
> vice versa, might do something drastic. Imagine the case where you have a
inline
> 4 and an inline 6, both use the same turbo, but the 4 has a drastically
higher
> wastegate opening pressure....
>
> > The last sub-bullet appears to be already covered by saying that you
> > can't alter the turbocharger unit, and by the "no unauthorized
> > modications to facilitate an authorized modification" rule.
>
> Perhaps.
>
> > I'm also somewhat concerned by the phrase "associated control hardware".
> > What does that mean, exactly?
>
> The bits that decide when to switch between turbos on twin-sequential
systems.
>
> > So my proposed re-wording follows.
>
> My changes added in:
>
> - Turbocharger units may not ported, clipped, or otherwise modified
> from stock.
>
> - Turbochargers may be updated/backdated, provided that the donor and
> target engines were both turbocharged and of similar displacement and
cylinder
> count/layout.
>
> - Twin turbocharger units and their associated control hardware (for
> twin-sequential types) must be updated/backdated as a complete unit;
Individual
> turbochargers may not be separated out, nor may single turbochargers be
combined
> to provide a twin turbocharger configuration.
>
> Better?
>
> DG
>
>
>
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