What compression ratio would be used on a low boost engine, say five

pounds as opposed to the higher boosted engines.  How much octane does it
to run a low boost turboed install?

Barny

As I recall all the turbo engines use 8.5:1. I could be wrong.
As far as octane I don't know. What are you car guys using?

Paul Lamar

87-88 engines 8.5:1
89-91 engines 9.0:1

usually pump gas 93 octane (R+M/2 method)

This brings up an interesting point. The later FC NA rotors are the same
weight as the turbo rotors but 9.7:1 and are theoretically a direct swap. I
will be finding out as my motor goes back together :)

I intend to run a max of 10 PSI (I'm at about 1000 ASL) and I'm looking for
more low speed torque. Other things will be modified as well, such as turbo
compressor size, porting, and fuel supply.

I can't see how the higher comp would help you 6200 RPM only guys though...
nor the lighter rotors. They help mostly with acceleration.

Mike Harrington

 
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