Originally Posted by 2500HeavyDuty
any stock duramax turbo wont last very long at 40psi. the lb7 turbo falls off the map at 32psi and anything beyond that its very unefficient
There are several trucks out there running non wastegated turbos. It can be done. Its all in the tuning. You wont make any more power at 38 than 32. 32 is just a number you read. Each truck is different. Mine maxes at 30psi, as my tuning will prove it. Others max at 28, some at 33. Some stock turbos wont make more than 500-520hp. While others support 570-595hp. This has been proven.