Water Injection Thread /turbo turbin

[Tom Sharpe]

Greg Hermann wrote:

> At the point just before
> the boost starts?
> >Long not isolated headers will lose a lot of the precius energy we have
> >when
> >we need it as most, when boost is starting ,
>
> Not if they are coated, inside and out and insulated--then the energy has
> nowhere to go!!
>
> Or maybe inject some water into the exhaust manifold when the throttle ix
> opened, but the turbo has not yet spooled up. This would increase the
> volume of the gasses greatly, even though dropping the temp. Prolly would
> act like a temporarily smaller nozzle for spool up!
>
> >the turbine?), then is better to have one of the smallest
> >exhaust housings on a big turbine wheel, I think this gives you not the
> >best peek efficiency but a wider aria.
>
> I will have to ponder on this one, may well be you are right. ( wide is good)
>
> >I have seen two stroke engines with tuned expansion cambers and turboes no
> >the end, tremendus output! Drag snowsleds with efi and tuned expansion
> >cambers and turbo.....WOW ---

RPM constant - variable transmission ---------------------- Tom

> This is awfully close to what I am talking about with a "pressure recovery
> accumulator"!! You givd me hope that one would work as I expect on a four
> stroke!!!
>
> Regards, Greg

You have to consider if you need spool up help or max efficiency under boost. In
my limited experience with a T04B on a 350 Chevy, the only time spool up was a
problem was full throttle acceleration from a standing start. That could have
been fixed by a loose converter, a transmission brake or just better brakes. The
GN boys have found a cure.

Above 2000 rpm steady state conditions, the boost gauge was hooked straight to
the throttle. No noticable lag at all under any conditions... smooth response
and boost. Throttle response was not as instantenous as the EFI on my NA motor,
henseforth, it would not go sideways if you wacked the throttle comming out of a
corner, just smooth power.  maybe easier to drive???

IMHO the large volume in the accumulator will have a very detrimental effect on
spool up. It may have an effect on max HP (efficiency) but we only run there at
WOT and high rpm like real racers.. down the back straight at Elkart Lake... but
most of the passing is done out of the corners.. except Nascar where all are
equal. I don't think you can have your cake with ice cream.

just another .02    Tom