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I just bought a 89 caravan cargo van and installed boost guage and air fuel guage. Its boosting 15 lbs into shutdown and air fuel is pegged on rich when it does that as far as i can tell it is completely stock with 46000 miles on it.
is this going to damage my engine if so how can i fix it? any help on this would be appreciated.
 

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rich is good, lean is bad. All stock turbo cars are tuned to run rich. That's why in most cases you can up the boost on a stock setup.
 

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get a boost controller and set it to like 13-14 psi so it doesn't hit cut out but I suggest getting an intercooler at these boost levels cause the heat your turbo is generating at these boost levels is hard on the motor
 
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