Single turbo low/no boost nightmare - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 2 (permalink) Old Today, 06:07 AM Thread Starter
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Join Date: Apr 2019
Posts: 5
Single turbo low/no boost nightmare

Okay so I’ve searched and searched and tried so many different wordings to google I had to clear my cookies.. Maybe someone here can help with ideas..

The issue at hand is under normal acceleration I am only building 10psi of boost, if I drive aggressively I’ll see around 30ish floored I’m right around 40psi! Also once up to speed and leveled out I’m LUCKY to see 2-5psi (blows donkey balls, can’t got over 60mph because egts hang 950-1080). Literally my egts just moving through my yard will see 400-500 degrees ��. About a month ago it was fine! Normal boost under average acceleration cruising at 60-70mph would hold roughly 10-18psi depending. Since this started I’ve replaced..

-Up pipes and gaskets
-exhaust manifold gaskets
-cac pipes
-cac boots
-fresh new sxe366 from KC
-MAF sensor
-switched from an SCT GTX with Quicktricks tuning to MiniMaxx
-new intake horn
-fuel filters (wasn’t due to this but needed to be replaced)

Literally spent hours reading data from my Matco Maximus and NOTHING out of the ordinary.. The turbo will spool under WOT, but normal acceleration like I said I’m lucky to get 10psi, moderate acceleration 20ish. It’s a leak or sensor of some sort but I’m stumped at this point. I’ve check everything on the exhaust/hot side of the turbo and it’s good with no leaks.. So I’m assuming something with the intake area UNLESS possibly a sensor? But I can’t see which sensor would cause issues with a fixed geometry turbo 🏻 Also once in OD I literally have to hold it to the floor for a downshift and it to build boost to accelerate. Perhaps I am over thinking it so a shot in the dark here to see if anyone else with a single has had issues like this.. the truck isles smooth as a Prius, no odd smoke (except soot) still getting half decent fuel mileage...

My truck specs are as follows:
08’ F350 4x4 6.4
-single turbo twin scroll SXE366 with divided feed
-flopro up pipes not get branch
-6.0 BD exhaust manifolds
-ARP studs
-fass 200gph
-4” down pipe
-4” flo pro exhaust open
-Rudy’s CCV reroute oil fill
-Mishimoto CAC upgraded hot/cold cac pipes
-10% nozzles
-Mishimoto intercooler
-Mishimoto radiator
-Sno performance water methonal dual nozzles 3&6
-EGR delete
-Sinister intake horn
-Ported intake manifold
-Frankenstein trans done in house
-Mahle Coated cit pistons
-Carrillo rods
-RCD stage 2 cam
-chromoly push rods
And a ton of other s*** that doesn’t really matter...
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post #2 of 2 (permalink) Old Today, 03:38 PM
Join Date: Feb 2012
Posts: 378
Re: Single turbo low/no boost nightmare

What is rail pressure doing? A 366 is pretty big for a stock fuel truck. Try a smaller turbo.
sooty is offline  

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