Boost, efficiency, intake temps etc.

[Jorgen Karlsson]

Michael Gough wrote:

> Hey everyone,
> Going along with the talking about turbo efficiency...
> I have a KKK K24 turbocharger from a 1983 5000 Turbo diesel on my
> JT engine.
> According to the SAE paper on the engine, it ran 11psi on the TD. On my
> engine, after going through the intercooler and piping, I have
> about 8-9 psi
> in the manifold. I doubt anybody has any expirece with this turbo, so I am
> wondering what kind of intake temps are too hot. I am going to raise the
> boost a little once I get my new fuel system, but I don't want to go past
> the point of diminishing returns. So if anyone knows what is "too hot" in
> terms of intake temps, please let me know.
> Thanks
> Mike

This does not really answer your question, I think that you really want to
know how much you can stretch the limits beyond the rules outlined here.

To stay away from detonation problems you try not to exceed 40oC (104oF) on
most engines. An increase of 27oC (48oF) is equal to around 10% decrease in
air density. If your intake temperature are higher then 40oC your
turbo/intercooler/engine/induction/weather;) could use some tweaking.

First of all you probably want to measure the temperatures between the big
components in the intake system.

Temperature in air filter, temperature in turbo inlet, temperature at turbo
outlet temperature at intercooler outlet. You also want to measure the
pressure at the turbo inlet, turbo outlet, throttlebody inlet.

Jorgen Karlsson
Gothenburg, Sweden.