What is the MAX Boost from Stock Turbo W/Stock tune?

[mars1952]

Hi: I just finished installing an X-wheel and a DieselSite TurboMaster Wastegate Control. I triple checked the connection between the Compressor housing and the X-pipe (AKA Y-pipe) and the intercooler hoses. I took the truck out on several 0-60 WOT runs. The highest boost was just under 20psi even after I adjusted the TurboMaster Wastegate Control all the way down.

Is 20psi the most that I can get with a stock tune? I could get 18psi with the stock waste gate controller. I relize that the X-wheel will not increase the MAX boost psi.
Mars

[ToMang07]

Originally Posted by mars1952

Hi: I just finished installing an X-wheel and a DieselSite TurboMaster Wastegate Control. I triple checked the connection between the Compressor housing and the X-pipe (AKA Y-pipe) and the intercooler hoses. I took the truck out on several 0-60 WOT runs. The highest boost was just under 20psi even after I adjusted the TurboMaster Wastegate Control all the way down.

Is 20psi the most that I can get with a stock tune? I could get 18psi with the stock waste gate controller. I relize that the X-wheel will not increase the MAX boost psi.
Mars

Sounds about right for no tunes. Mine (Right now) has just a DIY intake and a 4" exhaust, and I'm seeing about 19PSI @WOT.

With Just the DIY-intake and chip, (no exhaust) I saw up to 26 PSI @WOT.

[03_Turbo7.3]

yup until you chip it she'll go no higher..i see 28-30 tuned..

[Dietoremain]

get some tunes!

[mars1952]

Thanks for the replies. I am both please and dismayed that 20psi is the most you can get from a stock tune. Pleased because that means I have no leaks and dismayed because I believed the hype and expected to get 25psi. I plan to get a DP multi-tune as soon as I solve my transmission problems and beef it up. Everything else is in place and ready for a good tune.
Mars

[mars1952]

I installed a new dark gray with purple o-ring cps today. Afterwards I ran a coupe 0-80 WOT runs. I recorded the runs with my AE software. I glanced at the gauges during the runs and saw that the boost was reading a little over 20psi. When I got home and replayed the run the max boost recorded was 21.42psi just before I let up on the hammer.
Mars

[wingnuts514]

Originally Posted by mars1952

I installed a new dark gray with purple o-ring cps today. Afterwards I ran a coupe 0-80 WOT runs. I recorded the runs with my AE software. I glanced at the gauges during the runs and saw that the boost was reading a little over 20psi. When I got home and replayed the run the max boost recorded was 21.42psi just before I let up on the hammer.
Mars

A difference in temp and barometric pressure can change boost numbers 2-3 psi so it may not be the cps.

[mars1952]

Originally Posted by wingnuts514

A difference in temp and barometric pressure can change boost numbers 2-3 psi so it may not be the cps.

I hadn't considered atmospheric pressure or temperature. My mechanical boost gauge is plugged right into the manifold so it couldn't compensate for atmospheric pressure. I don't know it the reading from the PCM compensate for barometric pressure (MAP) but I doubt that they do.
More likely the increase came from the increased speed. On the earlier run I only hit 60mph on this run I hit 80mph. I just wanted to post the numbers so that others could see what a stock (W/X-wheel) turbo could do.
Mars

[ToMang07]

I did a WOT last night, first time I hit 20PSI w/o a chip... but it was uphill w/OD off, lol!

[wingnuts514]

same theory as well, higher speed and higher load will show more boost. Try revving your motor in park.