I have an 2003 Acura TL. It is a non S type. I would like to raise the compression in hopes to increase my fuel economy. I noticed that the s-type has a 10.5 compression ratio compared to the non s-type which is 9.5. Does the s-type have a higher compression ratio because of a different head gasket, different head or a different cam that allows an increased flow or all of the above? I heard that if I replace the head gasket with a stock or OEM one and take out a few of the layers that it will increase the CR. Will I have to buy a computer that will allow the change to be realized?

Next does a 2003 TL have high flow cats?

Thanks

 

no. if you take a oem gasket and take some of the layers out, you will have a leaking or blown gasket very soon.

the only thing head gasket wise would be to get a thinner gasket, and have the heads shaved. the s-type has higer cp due to it's higer compression pistions.

if you want better fuel econ, well, crap i dont know...i've never woried about it.

 

Thanks for the reply.

I found on wiki pedia that the S type has higher compression because of the cam and the increased valve size. If more air is coming in then there would be increased dymanic compression? Right?

So are there domed pistions in the s type? Do you know where I can get a set of pistons to increase to around 11:1?

will higer compression need to have the timing changed or not?

is there a device that will let me advance or retard the timing anyway?

what year did acura start using high flow cats? This should also increase hp and torque so I might get a little better mpg.

Thanks,

 

the pistons in the type-s have a different part number than the non-s engine. so im pretty sure to squeeze more compression out of the engine they are more of a flat top...possibly a very small dome. also the camshafts appear to have different part numbers as well.

you can compare part numbers here:
http://www.acuraautomotiveparts.net/...catdisplay.jsp