First, I don't need anybody to say "just buy a turbo car," because I do not have the means to do that right now. I do, however have a naturally aspirated 1990 740 GL and have found an entire turbo setup on FB marketplace from a reputable guy in my states' Volvo club for $300. I also want to have the experience of turboing a car. Does anybody have any links to a write-up on how to do this conversion? The seller is selling it with an oil filter relocator, which leads me to believe it is already from a B230f+t car. It comes with both manifolds, intercooler, turbo, downpipe, hosing, oil cooler, etc. What else do I need for this conversion? Would I be able to avoid moving the battery to the other side of the car by using a short ram intake on the turbo? Would I have to swap the ignition computer and fuel computer? What would have to be rewired? Thanks!

 

You are going to need a engine block from a turbo with a hole in the side of it for the turbo oil return tube - and low compression pistons -

 

would I be able to drain directly into the pan? also could I just use the same pistons with low boost? also, I've done some more research and it seems like there's a pretty good spot on the front of the engine, below the water pump and above the P/S pump, for an oil feed line. Is this plug thing there on every B230? I'm trying to do this as simply and reliably as possible because I am an amateur and I don't want to kill my motor.

 

I trust this is probably your daily driver? That you use to get to work, grocery store, and such? Or is this a toy that you just want to play with?

If it's a toy - go for it, play as much as you want - if this is a daily driver - well you know what I'm going to say.

As far as an oil feed from the oil pressure sending unit location - I wouldn't count on that giving enough oil flow to lubricate the turbo

 

It is a daily driver but I am able to take time off from work and borrow a car for anything else. How should I go about the oil feed?

edit: I’ve only seen people use the oil pressure test port as a oil feed line so far.. I’m also only using a stock turbo from a 740 turbo.

 

is this 1990 740 GL a Regina car? seems like a lot of the "GL" versions are Regina, rather than Bosch. ALL Turbo 740/940 are Bosch injection and ignition.

the turbo versions has a higher flow rate main fuel pump, AND bigger injectors. turbo 740/940's have lower compression ratios (as the turbo boost raises the effective compression ratio). Turbos have bigger radiators, and completely different air plumbing, with the filter box on the right side of the engine compartment, the MAF is on the output of the air filter box, before it goes into the turbo. due to all of these and other changes, the engine wiring harnesses are rather different.