Jump to content
SAU Community

Recommended Posts

Hi guys,

Im still looking at a possible solution to my turbo surging problem when i use my boost controller. So far i have the possibilities of spark plugs being rooted and boost controller duty cycle solenoid on max. Ill be checking the plugs this weekend however i have another theory.........

I have noticed recently that it could stem from my fuel pump. Now my fuel pump constantly makes a straining like noise to which my mate told me that he thought the pump was an aftermarket one, however im not too sure as the car is an import and there was no record of sach a mod. Could this noise be a sign that the pump is shagged and that as soon as i try higher boost it cant supply enough fuel?

Any help would be appreciated!

Laine

I suspect you will find it is a problem of the combination of turbos and controller. It is likely that the turbos cannot work efficiently when pumping as much boost as you are pumping (you haven't stated the boost your controller is permitting).

Try dropping the boost back a bit and see what happens.

As for the "straining" of the pump, have you changed the fuel filter recently?

Yeh sorry forgot to mention that i had posed this question in a previous post. The controller is causing problems at all levels of boost including the lowest setting of 0.8 kg/cm^3.

I also had the car fully serviced about 5 months ago but there may be a need to change the fuel filter again.

Regards

Laine

  • 2 weeks later...

Hey dude, did you end up fixing this?

My 32 is doing the same thing since I boosted it, only to 11PSI and its surging sometimes but not others..... Fuel pump access panel looks untouched so I think its the stocker in there still.

Anyone wanna help out? much appreciated

Doubt its fuel pump.. unless you have a wiring problem.

As mine went dodgy recently, you'll probably find its more likely just to cut out, or drop the pressure, not "spurt" more pressure into the system. It may be possible, but from my understanding I don't think that would be the problem.

Anyhow, your fuel regulator should stop any excess pressure getting to the injectors. It may be possible that is more likely to be the culprit. If that is gone, it may not be providing consistent rail pressure. Or likewise, blocked or dodgy injectors.

With the RB30 mine makes all its boost easily under 2000rpm if its loaded up.

Under 2000rpm I've noticed the car goes really flat then once over 2000rpm it's like a switch and clears up.

Watching the PFC hand controller's O2 sensor voltage I've noticed during this time of possible surge its reading maximum lean. If I hold my foot in to it she begins to missfire and pop a little. I suspect this is what they call a lean missfire???

Unsure really. I wouldn't put it past the stock turbo on the r32 to surge at such low rpms but the lean o2 sensor reading is a concern.

I'll have to get it on the dyno and check it out. I have had the Bosch 910 pump in since I bought the car 3yrs+ ago so I wouldn't be suprised if that is on its way out as 100% duty cycle only makes 176rwkw at a low ish rpm. I was under the impression the RB20DET injectors with a good fuel pump max'd out around 190rwkw or so and that is at a higher rpm where the injectors don't have as much time to push fuel in.

coils, or fuel filter just change the filter there only $10 or pull it off and tip it up the wrong way on to your hand and check what comes out if there is heaps of stuff then it blocked

Took mine out tonight, went fine, no surging or anything? Weird.... I thought this sorta problem was normally fuel pump related particularly in an 89 model....

Is it worth getting a new pump for piece of mind.? I'd hate to skimp on this and then having to rebuild the motor due to it leaning out......

Spend $35-$50 on a dyno power run for piece of mind.

All my fuel filters etc have been replaced. I will check the pumps sock tomorrow i think. :thumbsup:

Its still running the stock internal pump with an external bosch so no doubt as I run it to the red every tank it will have picked up crap.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • See if you can thermal epoxy a heatsink or two onto it?
    • The other problem was one of those "oh shit we are going to die moments". Basically the high spec Q50s have a full electric steering rack, and the povo ones had a regular hydraulic rack with an electric pump.  So couple of laps into session 5 as I came into turn 2 (big run off now, happily), the dash turned into a christmas tree and the steering became super heavy and I went well off. I assumed it was a tyre failure so limped to the pits, but everything was OK. But....the master warning light was still on so I checked the DTCs and saw – C13E6 “Heat Protection”. Yes, that bloody steering rack computer sitting where the oil cooler should be has its own sensors and error logic, and decided I was using the steering wheel too much. I really appreciated the helpful information in the manual (my bold) POSSIBLE CAUSE • Continuing the overloading steering (Sports driving in the circuit etc,) “DATA MONITOR” >> “C/M TEMPERATURE”. The rise of steering force motor internal temperature caused the protection function to operate. This is not a system malfunction. INSPECTION END So, basically the electric motor in the steering rack got to 150c, and it decided to shut down without warning for my safety. Didn't feel safe. Short term I'll see if I can duct some air to that motor (the engine bay is sealed pretty tight). Long term, depending on how often this happens, I'll look into swapping the povo spec electric/hydraulic rack in. While the rack should be fine the power supply to the pump will be a pain and might be best to deal with it when I add a PDM.
    • And finally, 2 problems I really need to sort.  Firstly as Matt said the auto trans is not happy as it gets hot - I couldn't log the temps but the gauge showed 90o. On the first day I took it out back in Feb, because the coolant was getting hot I never got to any auto trans issues; but on this day by late session 3 and then really clearly in 4 and 5 as it got hotter it just would not shift up. You can hear the issue really clearly at 12:55 and 16:20 on the vid. So the good news is, literally this week Ecutek finally released tuning for the jatco 7 speed. I'll have a chat to Racebox and see what they can do electrically to keep it cooler and to get the gears, if anything. That will likely take some R&D and can only really happen on track as it never gets even warm with road use. I've also picked up some eye wateringly expensive Redline D6 ATF to try, it had the highest viscosity I could find at 100o so we will see if that helps (just waiting for some oil pan gaskets so I can change it properly). If neither of those work I need to remove the coolant/trans interwarmer and the radiator cooler and go to an external cooler....somewhere.....(goodbye washer reservoir?), and if that fails give up on this mad idea and wait for Nissan to release the manual 400R
    • So, what else.... Power. I don't know what it is making because I haven't done a post tune dyno run yet; I will when I get a chance. It was 240rwkw dead stock. Conclusion from the day....it does not need a single kw more until I sort some other stuff. It comes on so hard that I could hear the twin N1 turbos on the R32 crying, and I just can't use what it has around a tight track with the current setup. Brakes. They are perfect. Hit them hard all day and they never felt like having an issue; you can see in the video we were making ground on much lighter cars on better tyres under brakes. They are standard (red sport) calipers, standard size discs in DBA5000 2 piece, Winmax pads and Motul RBF600 fluid, all from Matty at Racebrakes Sydney. Keeping in mind the car is more powerful than my R32 and weighs 1780, he clearly knows his shit. Suspension. This is one of the first areas I need to change. It has electronically controlled dampers from factory, but everything is just way too soft for track work even on the hardest setting (it is nice when hustling on country roads though). In particular it rolls into oversteer mid corner and pitches too much under hard braking so it becomes unstable eg in the turn 1 kink I need to brake early, turn through the kink then brake again so I don't pirouette like an AE86. I need to get some decent shocks with matched springs and sway bars ASAP, even if it is just a v1 setup until I work out a proper race/rally setup later. Tyres. I am running Yoko A052 in 235/45/18 all round, because that was what I could get in approximately the right height on wheels I had in the shed (Rays/Nismo 18x8 off the old Leaf actually!). As track tyres they are pretty poor; I note GTSBoy recently posted a porker comparo video including them where they were about the same as AD09.....that is nothing like a top line track tyre. I'll start getting that sorted but realistically I should get proper sized wheels first (likely 9.5 +38 front and 11 +55 at the rear, so a custom order, and I can't rotate them like the R32), then work out what the best tyre option is. BTW on that, Targa Tas had gone to road tyres instead of semi slicks now so that is a whole other world of choices to sort. Diff. This is the other thing that urgently needs to be addressed. It left massive 1s out of the fish hook all day, even when I was trying not too (you can also hear it reving on the video, and see the RPM rising too fast compared to speed in the data). It has an open diff that Infiniti optimistically called a B-LSD for "Brake Limited Slip Diff". It does good straight line standing start 11s but it is woeful on the track. Nismo seem to make a 2 way for it.
    • Also, I logged some data from the ECU for each session (mostly oil pressures and various temps, but also speed, revs etc, can't believe I forgot accelerator position). The Ecutek data loads nicely to datazap, I got good data from sessions 2, 3 and 4: https://datazap.me/u/duncanhandleyhgeconsultingcomau/250813-wakefield-session-2?log=0&data=7 https://datazap.me/u/duncanhandleyhgeconsultingcomau/250813-wakefield-session-3?log=0&data=6 https://datazap.me/u/duncanhandleyhgeconsultingcomau/250813-wakefield-session-4?log=0&data=6 Each session is cut into 3 files but loaded together, you can change between them in the top left. As the test sessions are mostly about the car, not me, I basically start by checking the oil pressure (good, or at least consistent all day). These have an electrically controlled oil pump which targets 25psi(!) at low load and 50 at high. I'm running a much thicker oil than recommended by nissan (they said 0w20, I'm running 10w40) so its a little higher. The main thing is that it doesn't drop too far, eg in the long left hand fish hook, or under brakes so I know I'm not getting oil surge. Good start. Then Oil and Coolant temp, plus intercooler and intake temps, like this: Keeping in mind ambient was about 5o at session 2, I'd say the oil temp is good. The coolant temp as OK but a big worry for hot days (it was getting to 110 back in Feb when it was 35o) so I need to keep addressing that. The water to air intercooler is working totally backwards where we get 5o air in the intake, squish/warm it in the turbos (unknown temp) then run it through the intercoolers which are say 65o max in this case, then the result is 20o air into the engine......the day was too atypical to draw a conclusion on that I think, in the united states of freedom they do a lot of upsizing the intercooler and heat exchanger cores to get those temps down but they were OK this time. The other interesting (but not concerning) part for me was the turbo speed vs boost graph: I circled an example from the main straight. With the tune boost peaks at around 18psi but it deliberately drops to about 14psi at redline because the turbos are tiny - they choke at high revs and just create more heat than power if you run them hard all the way. But you can also see the turbo speed at the same time; it raises from about 180,000rpm to 210,000rpm which the boost falls....imagine the turbine speed if they held 18psi to redline. The wastegates are electrically controlled so there is a heap of logic about boost target, actual boost, delta etc etc but it all seems to work well
×
×
  • Create New...