Recommended spark plugs and gap
 

What is the recommended spark plug and spark plug gap for a turbo-charged M44 engine?

No such thing.. That's something you figure out when your tuning your engine. The plug rating will change based on boost, fuel, compression, etc..

For instance a standard plug works for street on many, but if your at teh track you running a cold race plug and changing them more often.

The multi electrode plugs usually dont need the gap adjusted.

Cheers.

off topic, but more info on your turbo m44??

I figured there would be an ideal gap range for an M42/M44 engine under 7-14 lbs of boost. I know that running a colder plug definitely helps. I'll probably experiment with different plugs and gap ranges to see how the car responds.

E36 TI-M, if you read through the turbo install JohnBoy did for Yoda, it's that same exact setup. The car was tuned for 14-15 PSI by Midnight Tuning, but I currently have it set for 7-8 lbs.

Depending on boost PSI Autolite #3923 or #3922 for turbo I-4.

Fancy expensive plugs use hard metals so they last longer between spark plug changes. I believe these metals don't conduct electricity as good as a soft metal plug that uses copper. I change my plugs every 25,000 miles.

Autolite #3924 for stock motor no boost
Autolite #3923 for boost PSI up to 12 PSI
Autolite #3922 for boost PSI up to 29 PSI

:) Funny Autolite is the only plug that holds up in a 2 stroke go cart..

Cheers