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What motor?
What 'blew'? We talking cracked ringlands or window in the block?
Your first clue to what happened is the safc. The maf signal influences a lot of parameters in the tune, timing included. Without a method of retarding timing with boost, youre really playing with fire. If you really do your own tuning you know this.
I would never skimp on engine management. Your options may depend on first answer. Im having good success on megasquirt for my KA.T. if you want to reduce cost you could build your own ms or go w/ nistune or some other daughter board based system.
If the motor is a KA, the rings arent gapped right for boost from the factory. I don't care how awesome the tune is, when you start turning up the wick on a KAT you are on borrowed time with the stock ringlands/ring gaps. You can get away with more on the stock pistons if you pull them and give a little more gap on the rings but why not just do proper forgies at that point?
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