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Low boost with Switchblade turbo


880joe
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I have a 99 CH with a 355/380 just replaced heads and put on the switchblade turbo,full tilt exhaust manifold and rochester 2.5 injectors now I'm only getting alot of smoke and only about 20lbs of boost. Before the head job I was running full tilt manifold 75hp K&S injectors and a 460 non waste gated turbo and would get some smoke and around 30lbs of boost. Any ideas or thoughts where I went wrong

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Found 2 holes in the fresh air line from intake to air compressor,charge air cooler tested good. Not put the new line on yet but the holes on the old appear to have been there for a while so not sure that that is all my issue.

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Yea I'd like to know also? Haven't heard much on the switch blade as far as macks go you're the 1st. Only other thing i would suggest is the 171702 (bw s475) we run that turbo with 42 psi. Bit leggy on the bottom but once she spools it's off to the races with rochester's stg 2 on 93 vmac 1. Soon to be fully mech

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11 hours ago, 880joe said:

Not sure why it didn't work. It's  a BW 171702 turbo that starts out with a smaller than 115 housing then is supposed to open up to the 132 at 8lbs of boost.

Opening all the way at only 8psi seems like the problem in my mind at least.   Seems like it shouldn't go full on till 20-25psi.  

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  • 4 months later...

The guys at Switchblade Turbo built me a new turbo supposed to be correct size. They said the other one was to big still don't know why the 171702 Borg Warner was to big for my engine when I've heard of numorus others running that same set up. Will update after I get it put on and see how it performs.

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Glad to hear they are taking care of it.  Hope the next version works well.

There is a Youtube channel (Jpaydirt)that has put a couple of those turbos on his Cat powered KW and 1693 powered equipment and really likes them.

Edited by Freightrain
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IMG-20180116-202556-655.jpg

Larry

1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"

 

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  • 2 months later...

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