Jump to content
SAU Community

Recommended Posts

hey guys

latly iv been noticing my gtr is dropping oil pressure on hard accelration

mainly first an second gear drops to bout 2 bar and have seen my preset warning light come on at 1 bar

only for bout a micro sec, asson as i change gears pressures back up

normal driving not probs what so ever or even building boost slowly

motor has just under 6000kms on it and dosnt make any wierd knocks

motor feels strong with no lose of power (332kws)

usally iv got 2.8bar of oil pressure at idle

and bout 5-6bar a 3000rpm

im running an

apexi oil pressure guage

tomei oil pump

tomei sump baffle

head restrictor

motul chrono 300v oil over filling stock sump with an extra litre

is this the common rb26 problem that i keep reading bout??

im just abit worried

thx guys

Link to comment
https://www.sau.com.au/forums/topic/319797-rb26-oil-pressure-drop/
Share on other sites

  • Replies 53
  • Created
  • Last Reply

Top Posters In This Topic

How many litres do you put in the sump?

I put 6l in every oil change with a stock sump. I have seen this happen before, even 3rd gear full acceleration.

Even with the tomei baffle it happens, I'm suprised.

I'm seriously looking at a sump extension to help fix that problem, and a head to sump breather pipe.

6 litres in the sump on change,

im changing the oil on tuesday as its burnt a tiny bit of oil

it was the first time running full synthetic oil after run in

but on the tomei oil pump i left the oil pressure on the lowest setting (ie. didnt add any extra shims)

but where does 6 litres, or the extra litre get you on you on the dip stick? depends on oil cooler setup etc.

it should be on the bottom of the hump on the stick above the H mark.

i too have the tomei baffle but saw oil pressure drop on hard accel with the dipstick on H.

filled it up to the hump above H and no more pressure drop.

hmm, I personally would not be running a tomei pump without an extended sump. check the flow rates for the tomei pump and you will see it can empty the sump pretty quickly... JUN Tomei etc all strongly advise against running their pumps without increased sump capacity.

  • 2 years later...

Hi Guys

As part of my current build I will also be running a Tomei oil pump, ACL bearings (with an extra thou clearance) and sump extension (8L capacity). Unsure of oil weight as yet...

I am interested to know what oil pressure you're reading at say idle, 3k, 6k and 7.5k RPM?

Also those who doing track work what pressure drops are getting down to?

Reason I ask is am trying to figure out with EPC valve to run with Accusump....I found this doc from Canton, see link below:

http://cdn.racerpartswholesale.com/downloads/EPC%20FAQ.pdf

But just want to confirm the 35-40 psi valve is going to be the correct one??

Really unsure at which level of oil pressure (psi) I want the Accusump to open...35-40 psi Or 55-60 psi??

Cheers

i have 100psi at 7500rpm. nitto oil pump and running 20w50 torco sr1 oil.

Thanks mate. Appreciate that. Do you get any oil surge/drops in pressure?

Would be great to hear from others actually using an accusump and what EPC valve you're running...

Cheers

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

    • Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
    • -10 is plenty for running to an oil cooler. When you look at oil feeds, like power steering feeds, they're much smaller, and then just a larger hose size to move volume in less pressure. No need for -12. Even on the race cars, like Duncans, and endurance cars, most of them are all running -10 and everything works perfectly fine, temps are under control, and there's no restrictions.
    • Update: O2 sensor in my downpipe turned out to be faulty when I plugged in to the Haltech software. Was getting a "open circuit" warning. Tons of carbon buildup on it, probably from when I was running rich for a while before getting it corrected. Replaced with new unit and test drove again. The shuffle still happens, albeit far less now. I am not able to replicate it as reliably and it no longer happens at the same RPM levels as before. The only time I was able to hear it was in 5th going uphill and another time in 5th where there was no noticeable incline but applying more throttle first sped it up and then cleared it. Then once in 4th when I slightly lifted the throttle going over a bump but cleared right after. My understanding is that with the O2 sensor out, the ECU relies entirely on the MAP tune and isn't able to make its small adjustments based on the sensors reading. All in all, a big improvement, though not the silver bullet. Will try validating the actuators are set up correctly, and potentially setting up shop time to tune the boost controller on closed loop rather than the open loop it is set to now. Think if it's set up on closed loop to take the O2 reading, that should deal with these last bits. Will try to update again as I go. 
    • More so GReddy oil relocation kits, sandwich plates, etc. all use 10AN fittings. And same, I've only used 10AN and my car sees track work (circuit, doing laps, not 10 sec squirt business).
×
×
  • Create New...