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Old 01-04-2011, 02:33 PM   #11
Focus_Sh1ft's Avatar
Drives: 08 Yaris Turbo; 06 tC Turbo
Join Date: Jan 2010
Location: New Jersey
Posts: 875
Got some news to share with potential Zage buyers...

I've had this itching suspicion regarding excessive oil pressure on cold start up that causes leakage out the turbos seals. I now know 100% what happened in my case.

I was running a 1ZZ TB and on cold start up was getting oil pressure at atleast 100 psi (my gauge was maxing out). The service manuals say the oil pump should be operating between 20 and 80 psi, so I wanted to look into this further.

My theory is that the greater airflow from the TB was being seen by the ECU and the ECU was turning up the oil pressure toooooo much (ONLY at cold start up. Arguably where the greatest oil pressure is needed). This is a sound theory because during normal driving conditions the oil pressure usually directly correlates to throttle position.

I swapped my 1NZ TB back on and sure enough - cold start up hit about 82 psi and there was no smoking out the hot side of the turbo. Can't really say I've noticed a loss of performance either.

In a nutshell, I think the Zage oil pan is safe to use.

... Now I just need to figure out why I can't hit max boost.
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