too much boost = engine cutout

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03-20-2004, 05:16 PM

Scottsi

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too much boost = engine cutout

alright , d16z6, t25 custom turbo setup hf mani etc.
when i push 5+ lbs of boost the engine cuts out, like it has hit fuelcutout or something when only at 5k and im WOT,

already checked the map sensor, swapped it w/ my friends who is running 8lbs daily on his b18b, not the map sensor cuz it still did it then.

He told me it may be the spark plug gap, i gapped them at .030 or 30 whatever, thbat could have changed though, and they are 1 step colder cuz i was running n02, and timing is retarded 2 - 4 degrees.

anyone gimme some help on why this is happening, 5lbs just isnt fun, im trying to push 8 with my FMU, and the FMU is installed properly.

03-20-2004, 05:30 PM

chevy

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Join Date: Oct 2003

Posts: 831

Re:too much boost = engine cutout

make sure theres no exhust leakes between the manflod and the adapter.. that ---- happen to me and after i tighten them up it was good

03-20-2004, 05:34 PM

Dr.Boost

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Join Date: Mar 2003

Posts: 21,479

Re:too much boost = engine cutout

What ratio FMU? Souns like you might be leaning out.
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03-20-2004, 05:36 PM

chevy

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Join Date: Oct 2003

Posts: 831

Re:too much boost = engine cutout

that too... if u run to lean it will cut out

03-20-2004, 05:37 PM

Scottsi

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Re:too much boost = engine cutout

its a nismo adjustable FMU suposedly a 12:1 disk, its the same one used on one of the turbo projects on the main page.

the manifold and adapter are all good no leaks there

03-20-2004, 05:39 PM

Dr.Boost

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Join Date: Mar 2003

Posts: 21,479

Re:too much boost = engine cutout

If it's adjustable, try to richen it up a bit.

Any smoke?
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03-20-2004, 06:08 PM

Scottsi

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Re:too much boost = engine cutout

It has a little threaded vacuum nipple and if you tighen it it yeah you know, but ih ave it all the way loosened, and yeah it puts out a shitload of smoke, the seals on the turbo are leakin i guess or something.