XGTRX Posted August 7, 2014 Share Posted August 7, 2014 I have an energy depolerizer from a vl brocky. It may help all your problems in one hit. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360216 Share on other sites More sharing options...
Badgaz Posted August 7, 2014 Share Posted August 7, 2014 i'd say try a larger BOV that vents to atmosphere with a softer spring pressure....keep the airflow going in the one direction....feel sorry for you guys in Aussie with all your legal drama. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360315 Share on other sites More sharing options...
Ben C34 Posted August 7, 2014 Share Posted August 7, 2014 That will cause tune Issues with the afm though that will need addressing. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360320 Share on other sites More sharing options...
Badgaz Posted August 7, 2014 Share Posted August 7, 2014 That will cause tune Issues with the afm though that will need addressing. yeah but they'd be easier to fix. his mixtures will will be richer for a short time when he closed the throttle....could be sorted out whenever he wanted. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360330 Share on other sites More sharing options...
XKLABA Posted August 7, 2014 Share Posted August 7, 2014 A dual stage BOV would be better, stage one plumb back stage two atmo, that way there is some air going back to AFM and some well not, the trick is tuning it to get the right amount Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360363 Share on other sites More sharing options...
rondofj Posted August 7, 2014 Author Share Posted August 7, 2014 Well took off dipstick and can smell fuel big time. Will be taking off fuel pressure regulator vacuum hoses to look for fuel later. Stay tuned..this could be it, a leaking reg. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360364 Share on other sites More sharing options...
rondofj Posted August 7, 2014 Author Share Posted August 7, 2014 Theres 2 bloody regs/dampers on a neo though Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360366 Share on other sites More sharing options...
wolverine Posted August 7, 2014 Share Posted August 7, 2014 I have spare Nissan regs from R33's which I believe are identical. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360372 Share on other sites More sharing options...
rondofj Posted August 7, 2014 Author Share Posted August 7, 2014 Thanks, is it better to get new though, never know when the used ones let go- will check if I can use 33 one on a 34- i think the 34 neo has 2 dampers n 1 reg Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360401 Share on other sites More sharing options...
iruvyouskyrine Posted August 7, 2014 Share Posted August 7, 2014 i think the 34 neo has 2 dampers n 1 reg Correct Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360428 Share on other sites More sharing options...
hy_rpm Posted August 7, 2014 Share Posted August 7, 2014 If a fuel reg is bad or fuel related problem on a skyline not holding pressure There is the pulsation damper on the fuel rail to check Turn it off and check how far the screw on the damper is sticking out and leave it overnight Check if it has gone in and moved if so the fuel pressure is leaking if not all good You were complaining about the fuel economy and the tuner has already told you the o2 is getting lazy If a bad o2 was stuck too lean every time in closed loop it would try to dump fuel in to try to make the mixtures right Check if your o2 signal is fluctuating when warm Should be swinging high and low every second Also with the intake I would try to modify the existing one as moving the afm further or closer to the turbo will affect the tune And your std bov may not be flowing enough air for that turbo so it will still suffer from reversion and the std bov will leak Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360515 Share on other sites More sharing options...
XKLABA Posted August 7, 2014 Share Posted August 7, 2014 The only way a fuel reg can dump fuel in manifold is through the vac/boost line, start car and pull line off and look, for enough fuel to cause these problems it will flow out at you I have personally never seen a factory fuel reg go like that Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360549 Share on other sites More sharing options...
AngryRB Posted August 7, 2014 Share Posted August 7, 2014 (edited) If a fuel reg is bad or fuel related problem on a skyline not holding pressure There is the pulsation damper on the fuel rail to check Turn it off and check how far the screw on the damper is sticking out and leave it overnight Check if it has gone in and moved if so the fuel pressure is leaking if not all good You were complaining about the fuel economy and the tuner has already told you the o2 is getting lazy If a bad o2 was stuck too lean every time in closed loop it would try to dump fuel in to try to make the mixtures right Check if your o2 signal is fluctuating when warm Should be swinging high and low every second Also with the intake I would try to modify the existing one as moving the afm further or closer to the turbo will affect the tune And your std bov may not be flowing enough air for that turbo so it will still suffer from reversion and the std bov will leak so is the standard BOV still considered adequate for these size turbo's, eg GT30/GT35.. Ive seen aftermarket ones and they come with a range of springs, eg 6psi , so if using that then boosting under 6psi would give a shhhzutututu which might be a way around the legal side for people that want that, but you'd still have some reversion is that right? On a stock rubber intake, the BOV return is quite close to the turbo inlet, so maybe modify the intake pipe to mimick that, so the entry point is close to the inlet and theres a couple of turns before the AFM is connected. Edited August 7, 2014 by AngryRB Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360657 Share on other sites More sharing options...
Ben C34 Posted August 8, 2014 Share Posted August 8, 2014 I'm still using a stock bov with a 3076. I crushed it to apply more spring pressure so it doesn't leak. Previously had reversion issues, modified return angle in inlet pipe and it fixed it. Was surprising as the return was angled slightly to the turbo previously but obviously not enough. It's a very simple thing to change, angled nd is very likely the cause of Ron ' s issues. Anywhere that welds ally can do it. And cheap. And quickly. 1 Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360703 Share on other sites More sharing options...
rondofj Posted August 8, 2014 Author Share Posted August 8, 2014 (edited) The only way a fuel reg can dump fuel in manifold is through the vac/boost line, start car and pull line off and look, for enough fuel to cause these problems it will flow out at you I have personally never seen a factory fuel reg go like that thats exactly what I will be doing tomorrow morning - check for fuel in the reg and damper vacuum hoses. Hopefully I will find fuel and confirm a dead reg - can i use R33 reg on 34 /possibly wolverine's one or do I need a R34 one - wreckers or buy new? Hopefully no touch up tuning required, but how to check if its providing the req. fuel pressure under load - else it will lean out n go bang haha.. I do remember when DVS Jez had a go at my 'stock' car 3 years ago he mentioned the fuel pressure's playing funny and advised me to get a spare r34 reg, which I got thanks to Johnny, so the second time round I went up to Jez with the spare reg, we didnt end up fitting it cos it was alrite then.. Now I have to look for that little reg, dunno where I put it or if it still there lol.. And yes I use a stock 'crushed' bov like Ben C34 does. Edited August 8, 2014 by rondofj Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360724 Share on other sites More sharing options...
Dose Pipe Sutututu Posted August 8, 2014 Share Posted August 8, 2014 ^ lol that was soooooo long ago aye.. I have access to a hand held wideband, happy to spend a few hours diagnosing your car.. payment = beer Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360817 Share on other sites More sharing options...
rondofj Posted August 8, 2014 Author Share Posted August 8, 2014 no worries mate will hit you up if need be, let me test a few other bits over a couple weekends - fuel reg, iron out boost leaks, earths, new O2 sensor etc; I have decided not to get the wideband cos of extra costs of equipment itself, weld bung away from turbine housing, touching up tune etc.. Do u guys get ur NGK O2 sensors from repco/autobarn/bursons etc? Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360899 Share on other sites More sharing options...
Dose Pipe Sutututu Posted August 8, 2014 Share Posted August 8, 2014 ^ just disable it and disconnect it.. Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360907 Share on other sites More sharing options...
rondofj Posted August 8, 2014 Author Share Posted August 8, 2014 (edited) I still prefer to change it and keep it enabled as it was tuned with it - do any of the R34 NEO people use the r33 NGK O2 sensors with the plugs cut off and wires crimped together? NGK dont make a R34 one, rang em up. Else the universal PEC O2 sensor from Vulture Motorsport is what I got and its gone funny after just 3 years! Edited August 8, 2014 by rondofj Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7360984 Share on other sites More sharing options...
Dose Pipe Sutututu Posted August 8, 2014 Share Posted August 8, 2014 Noone tunes with the o2 on Link to comment https://www.sau.com.au/forums/topic/446097-power-loss-on-downshifts-bouncing-idle-and-slight-hesitation-at-specific-rev-point-r34gtt/page/10/#findComment-7361008 Share on other sites More sharing options...
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