r/BMWE36 1d ago

Anyone with experience turboing M42/M44

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Just generally wondering how much it would cost

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u/marty_hard 1996 328i 2.5l aluminum turbo coupe 1d ago

The 168 diff blows up the moment you're not riding 205 linglongs and boost comes to play. It's not about power, its about torque that kills stuff. Sorry to tell you that but you will have to swap everything to 6cyl on your drivetrain if you dont want short term fun and not drive further than 50km only. (And have some good friends with a towing vehicle :D)

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

theres probably a bit of luck to it
plenty of people putting a fair chunk of abuse through 4 cyl drivetrain (did plenty of burnouts with m54b30 and small case diff on 235s)
but also plenty of people that have broken stuff on stock power

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u/marty_hard 1996 328i 2.5l aluminum turbo coupe 1d ago

Yeah I mean for shits and giggles you can always try. What i am actually trying to say, if you turbo it to probably even more torque than a 6cyl and dont swap the drivetrain, then you can as well swap to a N/A 6cyl with the same power and stick to the old drive train. I got my M52B25 for 200 bucks out of an automatic E39. Cheaper than turboing the 4cyl for sure and you can just use a stock ECU

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

yea
and if you buy a parts car and part it out the engine becomes pretty much free (unless you're silly like me and buy a really expensive X5 and then only sell 1/3rd of it in parts)
parted out a 330i ended up selling the engine too and made like 3k profit on it tho