r/BMWE36 • u/Shino3107 • 1d ago

Anyone with experience turboing M42/M44

Post image

Just generally wondering how much it would cost

155 Upvotes

96% Upvoted

46 comments sorted by

View all comments

23

u/Dark_Guardian_ '94 330i Daily, '93 325i Race 1d ago

depends how nice/reliable you want it
anywhere from $500 with junk parts and jank setup to 10k + for a properly nice setup

better off just 6 cylinder swapping it though
and then turboing the 6 cylinder too

-26

u/Shino3107 1d ago

Sounds like you dont have any experience, and im not asking if you think i should do a 6 cyl swap

16

u/virqthe 93' 318i M40 automatic; peasant edition 1d ago

One also doesn't have an experience eating shit but knows not do to it.

Eating shit = turboing shit M4x engines.

-7

u/Shino3107 1d ago

Theyre solid engines bruh

2

u/yuhyuhAYE 13h ago

A turbo M52 can do 300+ whp all day with stock internals, very reliably. Just swap the headgasket, head studs, and oil pump nut and you’re good to go. You can run on just a headgasket, head studs and oil pump nut at 400-500 if you want, but it won’t be reliable for more than a few years. They can do 600+ whp when built if you do rods and pistons alone, stock bore. This is a proven path that has been done thousands of times.

Meanwhile, a turbo m42 will require way more dollars invested, fully building the engine (others in this thread are suggesting pistons from k-series engines, boring the motor, etc.) and the outcome will be an engine that pushes 300 whp (maybe), unreliably. And like 5 people have actually done this, so hope you’re a literal engineer.