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Boost Cut

GroundRun

By GroundRun,
in Engines & Forced Induction

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GroundRun

Posted
Posted

Ok guys, got a pretty straight forward Q. I have a 34GGT with the emanage/e-01 profec/sqv bov/cat back/front pipe done. But apparently from wat i've been told the reason i cant make it over .97 bar is because there is too much air going into the engine, making the ECU cut or something like that...anyways i was told to get a Z32 air flow meter out of the Nissan Fairlady 300ZX. Is this the only option i have causes its pissing me off that i've spent so much money only to be able to go a bit more over the stock boost.

Also, running on the stock turbo and the stock intercooler wat is a safe level of boost, i was hoping at least 1.3 bar. what do u guys think and am i a **** for being so dam long-winded!

Thanks guys!

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Steve Grand Master

Steve

Posted
Posted
Originally posted by GroundRun

Hey man thanks for totally ignore the main Q and straight away jumpin to the last part. So basically the only thing i got outta ur extensive thread was that i'm a dreamer and .97 bar is high...pppffftttt!  

That helps me out alot with my q!

lighten up a bit, he did give you good advice, better than no advice - I can think of two people now who probably wont be too ready to answer any more of your questions.

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GTRgeoff Grand Master

GTRgeoff

Posted
Posted

GroundRun,

obviously off to a bad start here :) and I don't have specific advice on 34's as 33's are my toy, but should be close enough. I found that something that feels like boost cut came on at higher boost/combustion pressures with a normal spark plug gap. I now run 0.8mm gap on standard copper plugs and have no problems. My turbo is a bit different and I now max at 10psi for lots more top end power :), but more lag, than i did with a stock turbo at 14psi(about the limit for the inconel/cermamic turbine on a stockie). I could change this with an aftermarket computer, and may do so eventually.

The problem is the limited spark available which is basically 'blown out' at higher boost/combustion pressures which kills the combustion process with a miss. Discussion has shown that exotic plugs also last shorter periods at higher boost requiring more frequent changes and negating their higher cost/lower change frequency. Coppers cost about $20 for a set at the 7 heat range.

The AFM flows fine for most uses except really high power and that becomes unusable and undrivable on the street so while you have the stock turbo stay at least under 15psi and just take your plug gaps down to 0.8 or even less if the truble still occurs.

Take it easy on the other guys, they have lots of advice but sometimes forget that not everyone knows the fundamentals of skylines immediately they buy one, and plenty of ppl will bull***t you on them due to ignorance. We all know honey catches more flies than vinegar.

:burnout:

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GroundRun Collaborator

GroundRun

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Posted

Yeah i did get off to a bad start skylinegeoff, but thanks for ur advice. I was told to change the stock turbo in the car by a number of people. All of which said that a larger turbo wouldnt have to go as hard as the stockie to produce the same amount of power. Makes sense.

ps: "We all know honey catches more flies than vinegar" man my mum says that! :D

Anyways to the other people whether its good advice or not, calling a newbie in this forum "a dreamer" when what i posted was a question did really hit off good with me either. There are ways to reply a Q (which was never answered to begin with)without coming off like a "know it all".

My original and main Q was regarding the Z32 air flow meter and if i had any other options to get around this problem. Now if there aren't which i'm guessing cause noone gave me an answer then ok...looks like i'll have to pay the wreckers a visit.

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Flynnn Grand Master

Flynnn

Posted
Posted

not just u mate, i got raped in the skylinesautralia the other night

i hate some ppl

i'm going to get him

<[RL]pAuLoSpOrTz> what happen nick?

hold on

http://www.skylinesaustralia.com/forums/sh...1779#post581779

these pricks

i swear man

****in dick call me a dreamer!

i bet he's one of those ppl that'll just sit by the side and know every detail about a car, in theory but would stall a manual at a hill!

****!

<[RL]pAuLoSpOrTz> ok i read now

i'm soooooo pissssed

<[RL]pAuLoSpOrTz> LOL NICK

hey at least he gave u some advice hahaha

<[RL]pAuLoSpOrTz> man

<[RL]pAuLoSpOrTz> u cannot

<[RL]pAuLoSpOrTz> run 1.3bar man

man the

<[RL]pAuLoSpOrTz> with no piggy back ecu

<[RL]pAuLoSpOrTz> and fmic

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mambastu Collaborator

mambastu

Posted
Posted
Originally posted by GroundRun

Ok guys, got a pretty straight forward Q. I have a 34GGT with the emanage/e-01 profec/sqv bov/cat back/front pipe done. But apparently from wat i've been told the reason i cant make it over .97 bar is because there is too much air going into the engine, making the ECU cut or something like that...anyways i was told to get a Z32 air flow meter out of the Nissan Fairlady 300ZX. Is this the only option i have causes its pissing me off that i've spent so much money only to be able to go a bit more over the stock boost.

Also, running on the stock turbo and the stock intercooler wat is a safe level of boost, i was hoping at least 1.3 bar. what do u guys think and am i a **** for being so dam long-winded!

Thanks guys!

Use the Boost Cut option in the e-manage software to cap the AFM voltage signal so it doesn't hit boost cut.

If you are getting up to 5V you really need to use a Z32 AFM or add the GReddy map sensor.

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