boost

how much boost does a stock 3.8 motor hold with tuning

as much as you can put in without detonation. usually 14 to 18 psi on pump gas and 23 to 30+ with c-16 and or alky injection it all depends on your tuning ability you can blow a motor up with race gas if not tuned properly
 
how much boost does a stock 3.8 motor hold with tuning

Back in the "day" when these cars were new, Buick engineers said the design limit of 3.8 turbo 1986-87 head gaskets is 22 psi.

With manufacturing tolerances and variables, and also age, this "limit" can change.

So why would anyone exceeding this threshold be surprised to blow/damage a head gasket no matter how good the tune, or race gas, or achy? :confused:

So in engineering speak, if you exceed this limit, expect it to give up eventually.

Owners that have blown head gaskets a 24 psi or so say, NEVER saw or heard knock, but the mechanical limit was exceeded. :smile:

Credibility of this comes from many HUNDREDS of blown turbo head gaskets I have replaced since 1987, stock and otherwise.!

Many replies here may tell you how they have exceeded this limit, but remember your key word - STOCK. :smile:
 
1987 buick grand national for sale $10,000

EXCELLENT CONDITION, ONE HARD TO FIND LEGENDARY RIDE!
Well cared, original good paint and rims,perfect body, no dent, runs well, color:black

Features:
3.8 turbo
Boost/knock gauge
temperature gauge
oil gauge
56900 miles+- per odometer
power window/door
Please contact:(808) 927-0737 for more info
email:hawaii002010@gmail.com

Note: Car is in Honolulu, Hawaii
 

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