Racing Beat recommends 4.5psi on an IDA, so going a little high probably won't hurt anything.
Going from memory I'm running somewhere between 4 and 4.5 on my 51IDA on a full bridge. Can't remember the jetting for the life of me however.
Sounds like 4 is a pretty safe starting point.
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2004 RX8 GT
1986 RX7 Track Car: 13B Bridge Port w/ Renesis Internals and Weber Carb
2003 MazdaSpeed Protege
1988 RX7 Convertible - new project
2004 Impreza and 2003 Legacy wagons for hauling groceries and The Dog
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