Things to improve for over 350Hp

[Gabriel30]

Hello everyone, I have an M20B25 with an 8.8:1 compression ratio. I want to build a turbo setup with a stock bottom end, but I’m aiming for a bit over 350 HP. I already have a GT35 China turbo from some time ago and a large intercooler (600 / 300 / 76).




My plan is to gather all the parts first and then start the project. The engine will be refreshed with new piston rings, and I will also install a waste-spark ignition system.




My question is: what really makes the difference when trying to make a bit more power, just over 350 horsepower? I’m thinking maybe doing something to the cylinder head? I’m also considering a slightly thicker MLS head gasket to reduce the compression a little more.




If you have any advice for me, I would really appreciate it. Thank you!

[Gabriel30]

Nobody ??

[hasa]

You need a standalone engine management like Maxxecu or similar. Then +400cc / 40lb injectors. Sachs 618 clutch. Good tune on a dyno. Then you have 350hp.

[Gabriel30]

What head gasket should I use?? Thank you !

[hasa]

I would try normal head gasket. You don't need more than 1bar / 14psi boost. If it fails, then add cut rings and still use std gasket.

[Gabriel30]

Do you know where I can find those rings? I’ve looked but nothing.

[hasa]

Look this article about "Fire rings": https://5150autosport.com/blogs/prod...26gFFf5HBXDyrh

Tool for machining the rings is Isky Groov-o-Matic for example (this is what I've used). They probably supply also the wire that is used to make the ring.