chip tuning/timing?

i have an 89 Turbo Supra, and it runs pretty rich. It's completely stock except for adjustments on the waste gate to give me more boost. I was wondering if there is any chip burning hardware/software or chip vendors that make chips for this car. Also, if there is any other way to adjust the timing on these cars to try to lean it out, that would be helpful. Thanks!

We don't have domestics with replacable chips, so you'll have to either use a piggy back A/F controller or a full standalone. There are tons of air/fuel controllers out now, one of the best and most common is the Apexi S-AFC. Also I would suggest not touching anything unless you have a wideband O2 sensor and/or a EGT gauge. It's not hard to blow a 7M if you lean it out too much. MKIII's run pig rich natrually, more safe for you, more safe for the engine. Did you shim the WG to up the boost?