I still had problems with the the same size hole. That is around 2.3mm, my restrictor is 1.5mm. I know many people with 1.5mm restrictor's on rotaries. If I were you I would still try a smaller restrictor. I actually have more problems when my oil is old and thin and the pressure drops, than when it is new and higher pressure.

IGY: What would you recommend for a restrictor on a T04E with a 1.32 Housing and .70 wheel?Its on a stock port 13BT.



Thanks

I actually had a smaller hole ib it (it is a WEBBER carb jet ) and I had it enlarged 'cause my turbo builder said he did not like how the inside looked so on his reccomendation I opened it up. When the turbo was new I had that same jet , same oil (weight & pressure) and there wasnt any smoke at all , I think the problem lies with the CHRA itself.

.08" or 2mm is a nice starting place on the TO4E. If it smokes then go down a size. Earlier in the post setzep gave some good info.

It is entirly possible that the CHRA is bad. What was the size of the original jet that you used? What about trying something in between?

I am done fighting with it , I am sending it back to AUSTRALIA to have it repaired / replaced its still under warranty , I dont want to go too small with the restrictor 'cause it may stop the smoke but may end up shortening the turbos life . I think the opening I have now is good (and the supplier did recomend this size too ) , I am also going to put an oil cooler in the supply line to get even cooler oil to the turbo which is supposed to be good for it.

oil cooler isn't a bad idea if you have the space