Scott Speirer wrote:

Hans Conser wrote:

Scott, a couple of thoughts.  When you say that you want the same power as the
stock engine, do you mean peak power?  If you do, then you will probably want
higher boost levels, as most aircraft aplications seem to run 5-6000 RPM, so to get
good power that low you are going to need more than 5 lbs of boost.  I would shoot
for 8-11 lbs myself.

I am aiming towards getting at least the same power curve as the stock engine, but I'm
not sure what that is.  I've gathered from this newsletter/conference that horsepower
gains can be obtained by doing modification to the port timing, and doing channel and
port cleaning and reshaping, but I'm just thinking of the engine in stock condition.  It
would be nice to get 160hp at 5000rpm, but I don't know how much boost would be required
and if the engine could reliably handle it.  Can the engine handle 8-11 lbs of boost?

Also, you are likely to gain a lot of efficency from a more open exhaust.  3rd gen
RX-7s gain 50+ horsepower with an open exhaust alone.  Remember that the cats (3 of
them) are very restrictive.

That sounds like quite an improvement.  What do you mean by open exhaust ... what are the
"cats"?  (Sorry for the dumb question here.)

I'll try and check your numbers later.

Hans

Thanks for the info.

Scott

Cats are catalytic converters for smog. 8-11 psi is nothing special.
Just make sure you have a good intercooler.

Paul Lamar

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