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how much boost is too much on a 3406E

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Old 08-25-2014, 12:13 AM   #1
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how much boost is too much on a 3406E

I tried blocking my wastegate on my KW, it went from a max of 26 lbs of boost up to 34 and pulls like a freight train, although it pulled really well before.

Is that a safe level for the factory turbo or should I hook t back up again?
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Old 08-25-2014, 12:23 AM   #2
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Can't recall a safe level for the factory turbo,but the stock head gasket will let loose just below 62 psi. Don't ask.

I know a couple guys who have played with trim codes for more jam, with a stock turbo, and been quite satisfied. Once you start to go big though, an aftermarket spinner is more than just a good idea.
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Old 08-25-2014, 09:59 AM   #3
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honestly I was kind of doing it as an experiment, I seem to get out pulled by other pre emission 550 cats, so I was just seeing how much I could gain for a day or 3, but the longest pull I have had it on is one mile before turning another corner hauling silage, tons and tons of stop and go driving, soft fields weighing 85000 lbs give or take a bit.

I'm going to put it back before I go hauling cattle for the fall at 102000 lbs.....I really don't want anything to go BOOM haha

good to know that the head gasket is that tough though
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Old 09-03-2014, 08:45 PM   #4
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More boost=less EGT. From what I have seen you can fuel and boost to 40 psi all day long. Your right foot and a good EGT gauge are essential. Also keep a couple boost boots, (CAC tube boots) and clamps with you. They will blow and do so loudly.
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Old 09-03-2014, 11:52 PM   #5
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I had a boot blow off a few years ago, scared the crap out of me
I'm going to have to throw a new pyro at the ole girl anyway, its been a wee bit out to lunch this summer, it will tell me that it will have a 1200 deg exh temp when just rolling down the road...that was before I blocked the wastegate, not sure what happened to cause that, something internal let go I'm assuming, or I spilt coffee on it
40 psi.....wow, my boost gauge doesn't even register past 35, how well do the factory turbos take that much "love"?
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