I just sold my old turbo in favor of a Precision GT3257E. I installed the turbo just yesterday and i went to start it up. When I first started it up, the wheel wasn’t spinning, so I immediately shut it down. I figured the turbo wasn’t spinning because no oil had reached the turbo before I had shut it down, so I pulled one of the spark plugs and cranked the car to prime the oil feed. I then reconnected the plug and tried to start it back up once again. Sure enough, the turbo started to spin, but was spinning rather slowly. I tried to let it idle for a little while longer, but about 3 min. after I had started it up, smoke started to come from the engine bay around the manifold area. Once I saw the smoke, I once again immediately shut it down. My oil return line comes off of the turbo at about a 45* angle away from the oil pan, so I used a 90* fitting to redirect the return toward the oil pan. the return kinda looks like this from a side profile:
{turbo}
//
\
||
||
((
====[oil pan]
The return has no kinks in the line and the diameter of the return at its smallest point is 1/2", which is about -8AN from one of the previous threads I found when searching. That thread also said that 1/2" was the minimum diameter for a return line, quoted from Corky Bell’s Maximum Boost. I also had to buy a new feed line fitting for the turbo and my friend gave me his -3AN fitting. All of the fittings and lines are -4AN on my original lines. I was hoping someone could shed some light onto the reason why my engine bay is smoking from the turbo/manifold area. Any help would be appreciated.