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Posted for <13brv3@mchsi.com>:
Greetings,
Is everyone able to use 87 octane unleaded without detonation? How about
you guys with the 9.7 compression rotors? Do you think this is perfectly
safe, or is it on the edge of being too low octane?
I'm in the beginning stages of trying to figure out how I'm going to set up
my turbo-normalizing control, and one of the things I'm thinking of is "what
if" the boost goes too high. I'll be using at least premium 93 octane in
the beginning, and may just stick with 100LL full time to save the hassle of
hauling fuel around. I'm just trying to get some feel for how much of a
buffer that will give me. I asked Bruce how much boost he thought would be safe, and he said to keep
it below 2-3 psi. I'm currently at 9.7 compression, and will be perfectly
happy to never exceed 2 psi, but I'm having some trouble finding a way to
keep it that low. All I should really need is a wastegate actuator with a
spring rating equivalent to 2 psi, but I haven't found such a thing. The
actuator is set up for a minimum boost level, and nobody puts a turbo in a
car with the intention of only boosting to 2 psi. I may be able to do some
spring replacement surgery on an actuator, or I perhaps use some other
pressure actuated dashpot, with an external spring. If any of you
turbo-wise folks have any suggestions, I'm all ears. Thanks, Rusty
Turbo 13B powered RV-3 (experimental aircraft)...Be Afraid :-)
1993 RX-7 R1... Not stock, carry bail money :-)
[It has been my plan all along to incorporate a manually-actuated turbo on my 13B installation, and redlining the MAP at 34"hg... this equates to (about) 2psi boost on a standard day, so I think we're singing the same tune. I understand you can find a pop-off valve that installs in the intake manifold that vents excess pressure to the atmosphere. I had intended to install one on my intake manifold to prevent me from inadvertently overboosting. While I haven't gone down the path to locating such a device, I'm pretty sure they're readily available, and would start my search at someplace like Turbonetics, where they talk turbos all day long. McInnis wrote about these pop-off valves in his book, so that means that it's not exactly new technology. Let us know if you manage to find one.
<Marv> ]
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