high rev oil pressure

[speedy]

i am running a t1 2276 turbo motor , i now have an oil light problem, when i hit the gas in third and run up to 7000rpm the oil preasure light comes on, shutting the engine down at over 100mph is not a pleasent experience ,when i looked at the oil preasure guage it looked ok 20psi ,when the engine is ticking over hot oil pressure is about 11psi this is low possibly need the bypass altering but why loose oil pressure on higher revs
any info would be appreciated
cheers jon

[wrenchnride247]

I hope you at least have a 30mm oil pump, and 1.5 deep sump. Do you have another pressure gauge you could try? 20 psi sounds too low. How much boost are you running. I think you posted some pics of the motor somewhere on here, but can't remember if you said what your engine specs were. How many miles are on the motor?

[1500SBR]

Speedy,

From your description, I understand it happens under hard acceleration (if you rev to 7000 in neutral or if you do it in just first and/or second it doesn't happen).

If it happens under a combination of circustances (7000 in third after pulling hard through the whole third gear), it has nothing to to with the high revs themselves

Could it be oil starvation caused by the amount of Gs your car is pulling (for such a long period) under hard acceleration.

A deep sump has to cure that, but it might not. If not you have to extend the oil pick up to the back of the engine.

It has happened to me (not in a Bug though)

I agree 20psi is too little, specially on a turbo engine. This could be caused by an bunch of reasons.


Regards,
Marcelo

[speedy]

cheers for the replys ,i was looking at the oil setup today and noted that the turbo oil pipe comes from the oil pressure sender on a t, ithe pipe is 5mm internal diameter ,i am going to change this to 3mm to see if this improves the tickover pressure of 11psi there should still be plenty of oil going to the turbo ,my last turbo ran quite happily on a 3mm pipe , as for the the high revs i will change the pickup pipe position when i change the oil this w/e and see how that goes , ihave been told that my car is pulling about 300bhp so it is a bit vicious on accelaration
cheers jon

[wrenchnride247]

speedy, if you can move your pick-up tube around through the sump plate you might not have a good seal where the tube pushes into the case. The typeI case has a bad habit of loose fitting tubes. Unfortunately you have to split the case to fix the problem. If it does not seal tight to the case you will have low oil pressure no matter what oil pump you have. The higher you rev the less oil you get.

[speedy]

wrench that is good to know i will check this out when i have a look on sat
cheers jon