TunedS2000

What would raising the compression do to the power? Would it only increase low end power or high end power or both? Also what are the negative effects? I understand how putting more air and fuel in an engine will net more power but I dont know a whole lot about compression so if anyone wants to chime in that would be great. Thanks

-James

RazorV3

it will create more power across the whole powerband.

steven975

you will probably need higher octane gas, too. I think the requirement for stock is 91, 93 may or may not do it.

also, to get the best benefit, you may want to get cam gears and tune the valve timing. the ecu also controls fuel and ignition, too...a new one may be needed for max benefits.

shivers

A thinner head gasket (as well as a milled head) will increase your compression. On the positive, you will gain power across the whole band. On the negative, the distance between the valves and pistons will be decreased in turn increasing your chance for valve to piston contact (engine goes boom). Another negative is that your cam gears will be off since the overall height of the head will be shorter. Due to the increased potential for valve to piston contact, I'd highly recommend getting adjustable cam gears and bringing your car to someone experienced in tuning the s2000.

kmvguy83

Power will increase all the way through powerband.

Higher compression = bigger explosion = more power

Higher compression = more heat = requires higher octane gas.

Although, I read somewhere s2000 can go 12:1 compression ratio w 93 octane.

RazorV3

good information posted so far. basically you will want to run higher octane gasoline because it is more resistant to detonation.

RACER

How reliable is a thinner head gasket? Would it be better to just shave the head and use the OEM head gasket?

kmvguy83

i would say thinner gasket is more reliable if it's made by a company like spoon, mugen, and etc.

not too many machine shop can mill head perfectly to thousandth of an inch. Also if you blow head gasket, you can replace just head gasket but if you mess up the head then... it's gonna cost you $$$

never use copper headgaskets. copper is for professional racing use, like the one's they rebuild after each race. reliablity on copper gasket is

RACER

I know of plenty machine shops than have the ability to mill a head.


No, it'll cost the machine shop.

kmvguy83

i didnt say there was none.

would you mill your head if there was thinner headgasket that drops compression exactly same amount?

if you just replace gasket, you can revert compression back to normal whenever you want by simply installing oem gasket.
why would you permanentely change head when there is alternate.