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How Much Boost Will The Stock Boost Controllerhold


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Bill just did a Upsolute upgrade for me.

Update: Just was driving normal and check engine lite came on. Checked the code it was P0171Lean1. Cleared it, boost immediatly came back for 2 floorings (2 min) lost it again. At least I got to floor it past the kid in a new evo. ;)

Hooked up a MBC (restrictor style) I can tune it back to normal boost, 12 - 14 psi. but boost comes in slower? Should I just leave it like that? What's the lean code about? I have 2 week old o2 sensors and Race cat.

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Hooked up a MBC (restrictor style) I can tune it back to normal boost, 12 - 14 psi. but boost comes in slower? Should I just leave it like that?  What's the lean code about?  I have 2 week old o2 sensors and Race cat.

The lean coat means your car is not adding enough fuel for the amount of air. This makes the car run hot, and generally is not great for the life of the engine. If the code comes back, worry about it. This is probably a chip map issue. In this case you will probably have to go through another cycle of ECU tuning with Bill (IE dyno again, send him the wideband graphs). This should get your fuel patterns fine tuned.

When you do a lot of work, sometimes fine tuning is required. No bad reflection on Bill. No two cars run exactly the same.

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