Ideally to run a lot of boost (10-12psi) on pump gas without a intercooler you want a low low 7.5:1 compression ratio.
Allows more boost and timing on pump gas.
a 9:1 cr definatly limited the amount of boost you can add on pump gas.
A intercooler or a water/methanol injection system is your best friend on this one.
Do a google search for autospeed and detonation and DIY.
Read the articles on home brewed engine ears- engine knock detector to allow you to listen for engine knock-detonation.
Build the knock detector- engine listener and use it. It works.
I build one for way under $100.
You build it using a $30 Radio Shack #33-1096 or #33-1097 listener amplifier.
The modification take about 1 hour to complete.
you need this simple cheap easy to build engine tuning tool if you want to experiment with more boost and timing.
you need to be able to hear the detonation before it destroys the engine.
i have seen cheap versions of these personal listener amplifers with ear buds, in dollar stores
for as little as $1..
Last edited by F-BIRD'88; 07-21-2012 at 03:07 PM.