I am not shooting for low compression? I am wanting to get rid of the s/c and gain the higher compression of the NA motor, maybe even more. My GS is bone stock and getting 24-26 highway. Are the pistons in a NA motor flat top, or is the shape of the bowl in the head different? Where do they get their higher compression? I am not really worried about loosing power, for power I have the other car in my sig. Another thing I plan to do is tune for a lower octane fuel because premium is over $4.20 a gal here. I guess this is just an idea for now but in theory you should be able to get better gas mileage with out the s/c.
What does the TDI run for a compression ratio? It pretty much has to be way higher than a gas engine just because it runs on diesel. Also isn't diesel way more efficient than gas anyways? So mix the power of a diesel with the light weight Jetta and you should get great mileage.
