tomj Posted September 13, 2004 Share Posted September 13, 2004 i have a 4 door aussie 31 with a series 2 rb25 in it, ie self igniting coils, and pink lablled afm. been on road a long time, but ive just got it a month odd ago. did cooler and zorst a week and half ago. garret cooler, and 3 inch turbo back system since then, whenever its on hard load, mainly on a cool night, it will begin to pop and stutter around the 5000rpm mark, and keep popping as long as foot is down, bring it onto boost slowly and not full load and its ok plugs are 7 range ngk's, 100km old now, gapped to .6 it will barely do it during the day , when it is warmer. fuel pump is a 500hp walbro and its rich, the flames and black rear bar are testemant to that as well as the alluring aroma of fuel that follows car around. possibilites coil afm boost cut any more? Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/ Share on other sites More sharing options...
R33vit Posted September 13, 2004 Share Posted September 13, 2004 What are you boosting too. Sounds like ECU cutting fuel due to over boost (boost cut) Is it a stock ECU? Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011476 Share on other sites More sharing options...
tomj Posted September 13, 2004 Author Share Posted September 13, 2004 stock ecu... im not sure what boost it is making to be honest its about 12 psi Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011560 Share on other sites More sharing options...
TurkeySlapper Posted September 13, 2004 Share Posted September 13, 2004 Hey, mine does something sililar, aussie 31 series 2 rb25 fmic all else stock, when nailing it in the dry it will run ok half the time and piss and fart the other half, but in the wet as it starts to spin in 1st or 2nd and the revs climb too quickly it just starts to rev then completely dies in the arse, then thinks about it, revs back up then dies again... veeeeerrrryyyy frustrating. Tomj i feel your pain Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011608 Share on other sites More sharing options...
tomj Posted September 13, 2004 Author Share Posted September 13, 2004 mines different to take bro, if i break into wheelspin , it will smash limiter and pop massive flame most of the time, so times it will fall over Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011635 Share on other sites More sharing options...
meggala Posted September 13, 2004 Share Posted September 13, 2004 boost cut tom you need an ecu or fuel cut defender and dont be a cheap skate wind the boost back to stock till you if a boost gauge seriously a cheap boost gauge cost me a motor so imagine what no boost gauge could do meggala Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011650 Share on other sites More sharing options...
TurkeySlapper Posted September 13, 2004 Share Posted September 13, 2004 yeah thats what i meant, if you hit the limiter too quickly, which happens when spinning the wheels, then it just shits itself. but if you acclerate full throttle without spinng it doesnt cut out but surges randomly thru the rev range. why oh why. Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011656 Share on other sites More sharing options...
tomj Posted September 13, 2004 Author Share Posted September 13, 2004 boost cut tom you need an ecu or fuel cut defender and dont be a cheap skate wind the boost back to stock till you if a boost gauge seriously a cheap boost gauge cost me a motor so imagine what no boost gauge could do meggala yeah ill do that, see what boost its making whats stock boost cut on a 33 auto ecu? Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011716 Share on other sites More sharing options...
blind_elk Posted September 13, 2004 Share Posted September 13, 2004 Can I suggest a heat-range 6 plug. And open the gap up a bit (0.8mm seems to be the norm) Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1011851 Share on other sites More sharing options...
JH32 Posted September 14, 2004 Share Posted September 14, 2004 tom just out of interest is your car a manual or an auto ? Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1012033 Share on other sites More sharing options...
tomj Posted September 14, 2004 Author Share Posted September 14, 2004 manual Jimmy blind_elk, the plugs where 6 series before, and missfired also , so i know it isnt plugs Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1012829 Share on other sites More sharing options...
blind_elk Posted September 14, 2004 Share Posted September 14, 2004 How much boost is it running? Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1013101 Share on other sites More sharing options...
JH32 Posted September 15, 2004 Share Posted September 15, 2004 manual Jimmy is nice ! Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1013171 Share on other sites More sharing options...
BBQ Posted September 15, 2004 Share Posted September 15, 2004 I think the stock boost cut is somthing like 16 or 18 psi. can't rember exactlly. Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1013210 Share on other sites More sharing options...
N I B Posted September 15, 2004 Share Posted September 15, 2004 Nissan boost cut has nothing to do with boost but airflow and fitting better turbos etc can bring it on at low boost. Link to comment https://www.sau.com.au/forums/topic/51022-help-diagnosing-problem-with-rb25/#findComment-1013215 Share on other sites More sharing options...
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