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i have a built 26 with a trust oil pump and recently installed a just jap oil cooler and connected my defi gauge senders up.

oil pressure is good driving normally, but when i boot it, oil pressure stays above 6 bar until it reaches about 6500rpm and falls to about 3.5 bar by 8000rpm.

rev limiter is set at 9000rpm so would probably drop below 3 bar by then :thanks:

i also have fresh oil in there, castrol edge 10w-60

thanks,

luke

could be a myriad of things, the cheap coolers are not real good for flow but we ran twin JJR coolers on the car in my sig with no issues. remove the inlets and check to see if the inlet is half covered... some of them are and these coolers are useless. If it isnt this i would suspect incorrect clearances by whoever built it..

thanks for your reply,

what do u mean by check if the inlet is half covered?

another question, is it important which way the oil flows? ie. engine > filter block > cooler > back to engine

Edited by luke20t
thats called oil surge mate.

next time it does it. just stop acellerating. and it should leval out. basicly keep filling oil till it stops surging.

even though the sump is baffled and the oil level is almost on full on the dipstick?

depends what sump you have, stock gtr sump wont but if your running an rb rwd sump (assuming the car isnt a gtr) then there is every chance no matter how much oil you stick in there it is going to surge.. mine was the same

added more oil..

booted it a couple times and the oil pressure seems to be holding above 6 bar.

i cant believe how much oil i have put in now! close to 6.5 litres!

just hope this wasnt happening b4 i put the cooler in, because i never had it so full.

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