Lowering Compression with Head Gasket

[Big_E]

My Zenki started out as an N/A car with cp pistons 10:5 to 1. I obviously need to lower the compression for boosting. My question is how much would a thicker HG lower it? The guy building my car doesn't seem to worried. It has a GT28rs (Disco Potato) and crower rods.

[TheRealSy90]

You technically don't need to lower the compression for boosting. There's turbo cars at higher elevations running more compression than that. It really depends on what fuel and engine management you're going to use.

[Big_E]

I was planning on just using pump gas 93/95 octane and it only has an safc 2. I know this guy knows way more than me. which isn't hard to do. I am just worried about getting it back and blowing it up. He's saying he wants to put 20+ lbs of boost through it. I just see a lot of people saying that is way to high compression. Thanks for the input

[KAT-PWR]

You will see like .1 compression points difference. You aren't going to drop from 10.5 to 9.5 or anything of significance.

You probably dont wanna push passed 15psi. 18psi is the rule of thumb for sensible compression on boost on pump gas or similar.

I think after wacking my head and block, and running a metal gasket it bump my compression up like .15 if all my math was correct.

[Big_E]

Yeah, I know minimal about about turbos and engines really. I have had horrible experiences with shops in the past. I told him from the gate in not looking for a 400whp monster. I just want a fun streetable driving car. If I can break 300 to the wheels ill be happy. I just don't want to over heat it every mile it blow it before breaking it in.

[KAT-PWR]

Tuning becomes VERY important as you increase compression. I recommend keeping the boost low. My friend is on a 10.X on his honda and he keeps it at 12-15psi

[Big_E]

Thanks for the info. If I'm talking out my neck lmk but can Hondas get away with higher compression due to the way there cams are or something to that affect