The Bastard Child Buick Board
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What I've seen from the locals is they've picked the wrong WB from the drop box or the WB or NB sensors are kaput. WB sensor takes over about 70 percent throttle...and the NB looks after anything below that. Both sensors have to be in perfect condition. Link is for Erics 6.1...https://www.turbotweakstore.com/ProductDetails.asp?ProductCode=1026
I would suggest staying with the 5.7 chip. Runs right out of the box as long as you have the supporting hardware installed. A new MAF and translator is cheap insurance to keep you off the side of the road when the stocker goes kaput.The absolutely most important thing you should do before playing with the performance is to get the basic stuff nailed. Verify the timing, does the engine have the original timing chain, ensure the cam sensor is installed and set correctly, TPS adjusted correctly, IAC set correctly, TV cable adjusted properly, fuel pressure set, no vacuum leaks, no exhaust leaks pre-turbo. Without going for broke, the 5.7 chip is all the daily driver could ever possibly need and the engine will live.