Blue32

I thank you for your input - and you are right that this would indeed cause the issue, albeit with different characteristics (like it wouldn't make 8 Bar of oil pressure when cold and a few revs onboard if the PRV was venting oil straight back to the sump). The filter is still sitting on the workbench and you are welcome to inspect, however you will find no problem as the filter / cooler setup has not been manipulated. It also begs the question why would I bother to post this quandry if I knew the problem in the first place?? You have been helpful outlining a possible cause - as this is the reason I started the thread in the first place, however I can assure you that the reason is definately not what you have posted. Any other ideas?

Great team that - should be at the pointy end of the field

Yep the vintage pig is entered in this - I'll be there!

I don't believe it is the PRV either - no witness marks on the piston, and it needs the max oil press (120psi) to actuate, therefore ruling it out from the idle shutdown and restart scenario.

Do the nitto units suffer from this though??

Doesn't sound like fun, although I agree that shouldn't affect the oil pressure issue it has currently experienced

No thermostat on the oil cooler setup, and seal on pickup was fine. No o ring on the pickup used - there is a gasket. I agree about the no cause found..... however there was no oil pressure previous and I have made totally sure the path from the pickup to oil pump to filter and back to block (where the factory oil pressure sender / light switch) is totally unobstructed.

Guys, Thrown a curve ball on a recent oil pump change on an RB25DET. Brief schedule of events: Built motor run in and no problems, customer wanted to change N1 oil pump to Nitto for obvious reasons. Pump change completed, all normal considerations attended to (prime pump etc) and it was cranked with oil pressure(no plugs / load on engine). Engine was then prepared and started to bleed coolant and oil level was checked at correct level both BEFORE and AFTER initial start. Oil pressure still normal at this stage. A few starts later, and the customer drove the car to tuner to have dyno run, and upon shutting the engine off oil pressure was fine and normal, and upon restart NO OIL PRESSURE (verified on factory light, oil pressure gauge and Defi Oil Pressure gauge / ie 3 independent sources. Tuner pulls of Turbo oil feed, starts car for a brief moment, no oil coming out. Car towed at this stage. I get it back, suspecting blocked pickup. Remove everything including oil pump - no obstructions SEEN however I have pressurised oil system using AIR PRESSURE and seen a corresponding pressure indication on Oil pressure gauges. Oil pump was stripped, no blockage / foreign matter, gears excellent and no witness marks anywhere. Repacked oil pump with vas, and reinstalled. Via external oil filter block, pressure side of oil system back to pump primed with around 600ml or so of fresh oil (didn't measure) till full and clear of bubbles/air. Filter filled with oil, cooler pressurised with oil (using gearbox syringe and fitting) and then engine cranked once again (no plugs) with oil pressure coming up within 10secs of initial crank and normal limits. I am confident of the installation (both times) however although I have got oil pressure back, I wonder what the cause was in the first place?? I have covered everything twice and simple things like the oil filter installation is correct. Has anyone experienced this phenomenon?????? I call for experienced engine builders etc here, please don't tell me once you filled your lawnmower with fuel and now you can service the QE2.......

I wouldn't concern yourself - I'll have my gauge tech check it out :-)

A little taste of Mallala......

Thanks guys - next event is Mt Alma 2nd and 3rd of April! Get down and check out the 370m straight before turn 1.....should be good to stretch 430rwkws of legs!!!

Mine from the same event..

Will swap for ID1000cc .....

700cc SARD injectors to suit RB26 Excellent condition, only 3500kms of use. Injectors available NOW. With Bosch 044 and Sard Regulator these have supported 430rwkws at Factory base fuel pressure / pump fuel. $550 INC postage - Western Suburbs in Adelaide For those in Adelaide fitting is available for a little extra..... PM me

These are now available...... get in quick for a bargain!

An awesome but very hot day at the track. Was great to get out in the vintage car and cut some more laps - been over 18 months since I went round and round as fast as I can without breaking something. The day was won by Steve Knight in his wicked Evo 6. My wrap up: Canards and Splitter - win Downforce - win Structural integrity of said splitter and canards - FAIL. Brake water spray - win Flammable brake ducting - FAIL It was like I was on fire as the car started to behave itself more, and then it was on FIRE!!! Anyways, it'll be back again, stronger and kickin' it to the front runners. A big thanks to Sponsor Willall racing for helping me out with a far older GTR than they are used to (albeit not RH9), Infinity Signs for at the 11th hour sorting me out with my crazy car design and stickers, and Autosport for the awesome effort with brake pads on Friday and tow equipment required to make the day. Cheers, Andrew

At your cost I am happy to have them flow tested. These are currently fitted to my track car which only has high quality fuel put through it, in 3500kms I have changed the fuel filter 4 times and I change the oil on average every 150kms. They had new rubbers and o rings fitted when I fitted the injectors and are in excellent condition.

PM sent

$550 inc postage

Willall's will have some very fast GTR's out for this day - well worth getting to the track for a look!! It is going to be a very challenging day with the broad array of high performance track cars entered..... I just hope my vintage 22 year old datto is up to the task.....

700cc SARD injectors to suit RB26 Excellent condition, only 3500kms of use. Injectors will be available after March 6th. With Bosch 044 and Sard Regulator these have supported 430rwkws at Factory base fuel pressure / pump fuel. $550 plus postage - Western Suburbs in Adelaide For those in Adelaide fitting is available for a little extra..... PM me

Factory RB25 are side feed and GTR are top feed injectors, need to convert to top feed rail and need resistor pack as well. It can be done but I'll default to RB25 guru's to confirm.

700cc SARD injectors to suit RB26 Excellent condition, only 3500kms of use. Injectors will be available after March 6th. With Bosch 044 and Sard Regulator these have supported 430rwkws at Factory base fuel pressure / pump fuel. $550 - Western Suburbs Fitting available for a little extra..... PM me

Keen to represent the South Aussies in this event with my vintage R32 track monster.......keep me posted :-)

After 2 17x9 rims with tyres to borrow for a couple of days (Wednesday till the weekend) this week whilst the GTR hits the dyno for a quick check. Happy to accept other GTR offsets / sizes as the car will be run in rear wheel drive. Think of the bragging rights of your wheels and tyres doing over 400kws thru them.......