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Engine Cuts Out For A Slit Sec/boost Issue

pork hunt drifting
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chef_stagea Grand Master

chef_stagea

Posted
Posted (edited)

bov opening at full throttle... relesing all pressure in a slit second will cause the turbo to spin way more than what its ment to...

mines failed at 14 aswell... i cant c this 'compressing the housing mod" being at all legit!

Edited by chef_stagea
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Not saying your bov is faulty but there is a mod suggested by a tuner. Take the bov off and you'll see a small hole about 1.5mm. Ideal: find a threaded screw or bolt and tap the hole to suit. Put the screw in and mark where it sticks out. take it out and cut it off there and cut a slot in it and screw it back in. Not so good: get a self tapping screw and do the same.

I ended up getting a GTR bov. It bolts up fine but the hose is bigger so you have to adapt the plumb back.

pipster11 Grand Master

pipster11

Posted
Posted
Not saying your bov is faulty but there is a mod suggested by a tuner. Take the bov off and you'll see a small hole about 1.5mm. Ideal: find a threaded screw or bolt and tap the hole to suit. Put the screw in and mark where it sticks out. take it out and cut it off there and cut a slot in it and screw it back in. Not so good: get a self tapping screw and do the same.

I ended up getting a GTR bov. It bolts up fine but the hose is bigger so you have to adapt the plumb back.

whats the advantage of this?

do the c34 bov's have this? i didn't look last time i had the bov off

d1_drifter Community Regular

d1_drifter

Posted
Posted

It's been debatable for a long time if that does any good. Some say yay, and others nay. But for 30sec worth of effort, it doesn't hurt to do it!

C34's along with all other rb25's have it.

DeanR33 Enthusiast

DeanR33

Posted
Posted

Glad I found this thread. I've been turning up the boost on my series 2 and I think I hit fuel cut. I asked on the regular skyline pages and was told that disabling the boost sensor could be a bad thing because it leans out your AFRs, though I'm running rich (around 10.5) at full boost.

My Stagea has FMIC, Walbro,Iridium 1 grade colder plugs,new coilpacks,Apexi induction kit,decat,80mm cat back exhaust,gizmo ebc and hybrid steel internal turbo.

  • 7 months later...
webng Experienced

webng

Posted
Posted (edited)

Reviving an old thread. My S2 has started doing this recently, i noticed my boost had dropped from everyday 10psi to 6psi according to my boost gauge, so i turned up the Turbotech boost controller but when i floored it, engine seemed to cut out at full boost, which still was under 10psi according to the gauge mind you. Never had this problem before even up to 12psi. Is the MBC shagged? or is the boost gauge wrong?

What should I do? Looking at getting Nistune done with the next big service, would that fix it?

Edited by webng
webng Experienced

webng

Posted
Posted

Sounds like a boost/fuel cut to me.... Mine does it to

Yeah that's what it feels like, but why all of a sudden now? Maybe the boost gauge is buggered? Or maybe there is a boost leak somewhere? Whatever the case, i'll be booking in for the Nistune done this week I think.

Sunkist Grand Master

Sunkist

Posted
Posted

i know im an M35 owner, but I will be interested if you find a result to fix the issue.

mines doing some sort of airflow cut at 20psi. but the airflow meter is clamped at 4.70v(well before AF Cut)

so i'll be keeping an eye on your result.

QWK32 Veteran

QWK32

Posted
Posted

Have you checked the vac lines to the boost gauge? Could have a hole in it. It sounds like your hitting the factory ~14psi boost cut the S2's have, if your gauge/lines are faulty and the gauge is displaying a lower reading, then you may have turned the boost up too high and are hitting the limit.

lilcrash Veteran

lilcrash

Posted
Posted

Just a note on the boost dropping off- Why has no one said anything about the turbo can't make 14psi all the way to redline, shit it cant hold 10psi to redline, the VCT is there to fill the hole in the turbos abilities. I've got a turbosmart type 3 and its still loses boost. The boost drop off is because the turbo is too small. I'm pretty sure it's just one more factory floor for the poor old stag. Thanks nissan :(

webng Experienced

webng

Posted
Posted (edited)

If it is the boost cut, R and R or suchlike then a tune with a Nistune will fix it.

It just occured to me... would putting 100ron fuel cause R&R?

Cooler weather, might be hitting a tiny bit higher boost.

But never happened with colder weather before.

Have you checked the vac lines to the boost gauge? Could have a hole in it. It sounds like your hitting the factory ~14psi boost cut the S2's have, if your gauge/lines are faulty and the gauge is displaying a lower reading, then you may have turned the boost up too high and are hitting the limit.

This sounds possible, will have another look at the lines. Edited by webng

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