[Diy_efi] "Wet" Manifold Questions

[Stephen Andersen]

I have done some recent calculations due to discussions on 
another mesage board regarding this.  The addition of an 
intercooler that is about 70-80% efficienct, which is 
easily achievable, on an 8psi compressor outlet application,
with 2 psi pressure loss in the IC and piping (which is pretty large
for an 8psi application), still comes out ahead in power over
the non-intercooled setup.  Not hugely, but it does come out ahead.

That is with all else being equal.  The IC'd setup would also have 
FAR less propensity to detonation.  The bottom line is that the 
charge-air cooling (and the resulting densification of the air) is 
still greater than the density loss due to the pressure drop.

Now, take advantage of the intercooler by bumping compressor
outlet pressure up to 10psi so that you still have 8 psi in 
the manifold, and you are talking about a VERY significant 
increase in horsepower (10+ %), while STILL maintaining LOWER
inlet air temperatures and less tendency to detonate...

Steve

> True, but one reason perhaps to bypass an intercooler is due 
> to the internal
> restriction.  If you are running 6-7 psi of boost and the 
> intercooler robs
> 1-2psi, that would hurt, wouldn't it?  Maybe you can run only water
> injection???  I have wondered that myself.  I am working on a 
> turbocharger
> install, and I've considered only running water injection.  
> Projected boost
> levels are 7-10 psi max.  That is about all the Aerocharger turbo can
> handle.  The only negative to water injection seems to be 
> reliability and
> the risk of running the tank dry.  My air-cooled engine sure 
> could use the
> engine cooling effect of water injection.
> 
> Regards,
> jay

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