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Thanks for the reply Jeff, > Sounds like maybe your oil volume to the turbo is excessive > or the pump is pulling air instead of oil,... For testing I've temporally fitted transparent pipes to the oil return system, so I know that pumps definitely pulling oil. > I would put a 3/16" restrictor in the turbo oil supply line to > limit volume, not pressure. Well I'm supplying the oil to the turbo via dash 4 (7/32"ID) hose which is reduced slightly where it's pushed over a barb type fitting on the turbo. So I think the supply is already restricted to 3/16", or there abouts. However what you say does make some sense because the system seems to work fine until the oil gets hot, and I guess less viscus. I could try restricting the flow still further and monitoring the pressure with a gauge fitted between the restricter and the turbo. I'll check to see what min and max oil pressure Garret recommend for the T3. Thank for the pointer Jeff. Regards Tim Drew -- mailto:timdrew@cix.co.uk --------------------------------------------- For my PGP public key send a blank e-mail to: mailto:pgpkey@timdrew.cix.co.uk ---------------------------------------------