[armonkazemi1]

Hi guys,
I'm new here but I'm a member of the George Mason University FSAE we have selected a 2001 F4i as our engine and we have decided to go the turbo route but unfortunately, we've been having some trouble with the selection of our turbo, and getting information about it. I spent a couple of hours on here so far just on this topic and I've seen that there are people on here that have done this but they don't list any true specifics about the turbo, although they do mention that most of the work that they do is one-off. I was wondering if you guys could help us out here and give us suggestions for turbos or if you've built one yourself if you wouldn't mind reaching out to us about it! It would really help us and would be greatly appreciated! 😄

 

[oldbastard]

Never heard of an off-the-shelf turbo kit for a F4i but technically it is possible provided you don't want to go for more than 50% more power in short bursts. Beyond that needs different cams, intercooler, ignition remapping etc.
There is plenty of info from Garrett on turbo compressor maps,you just need to match your expected air flow rate and desired manifold pressure to a reasonable compressor efficiency.
You'll almost certainly need to lower the CR,12:1 is probably too much,but a thicker head gasket is the usual fix. You dont even need a wastegate actuator , just weld a radiator cap into the intake manifold to blow off excess air and protect the turbo from overspeeding. Trickiest bit will be the fuelling, unless you ditch the fuel injection and go for suck-through carburettor. Very crude but you don't care about gas milage,right?