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Old 05-22-2012, 01:05 PM
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Stock boost question

Anybody know (or remember) what a stock turbo, stock tune 6.0L makes for boost. I seem to remember around 28 lbs (stock tune) but when the stock turbo went up and I switched to a powermax, she didnt want to make over 22 lbs (stock tune). Now with my preditor tune it will make about 31 lbs. The boost is there with aftermarket tune just not with the stock tune. Weird?
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Old 05-22-2012, 01:58 PM
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I have seen anywhere from 28psi to 32 psi stock with no tune no over boost codes. Have you made sure all of your clamps are tight? Leaks from the up pipe?

Last edited by WarChild; 05-22-2012 at 02:05 PM.
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Old 05-22-2012, 05:23 PM
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A stock truck will make anywhere from 20-28 with no other concerns. The only trucks that will set an overboost code P0234 are the 05-07s with the latest ford calibration. The calibration will set the wrench light and derate after 28 PSI

Every truck is different. Usually the heavier they are the more boost they make. I just finished up a 550 that was one running machine. It was just the right weight to make the most of the rear ratio and power band. It absolutely hauled on the stock cal making 25 psi.
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Old 05-22-2012, 05:40 PM
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I just find it weird that I lost almost 10 psi (stock tune) just by switching to a powermax turbo.
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Old 05-22-2012, 06:50 PM
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As stupid as it sounds some turbos stick or are sticking in a manner that is favorable to performance

doesn't the powermax need more fuel to properly clean up? maybe that has something to do with it. I didn't think you could run the powermax on a stock tune and still have it work okay. I don't know
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Old 05-22-2012, 07:03 PM
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Mine is all stock, no tunes. I can't get more then 21
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Old 05-22-2012, 07:10 PM
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here is a question about boost: how does the ecm measure boost? at what location is boost measured?
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Old 05-22-2012, 09:04 PM
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my stock '05 turbo saw 31psi a few times, but my 03 turbo tops out at 28psi.

the powermaxx makes less than a stocker because it moves air more efficiently. you will probably be able to increase the boost with tuning.
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Old 05-23-2012, 04:07 AM
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Ok. Makes sence. With my tunes, my towing tune makes about 25 lbs, and my performance tune makes about 30lbs.
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Old 05-23-2012, 04:50 AM
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Quote:
Originally Posted by lubbock guy View Post
here is a question about boost: how does the ecm measure boost? at what location is boost measured?
MAP sensor.
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