not Z related. My daily driver is a 99 dodge neon r/t. I bought it 4 years ago thinking that it'd make a great cross platform for daily driving and autocrossing/track racing: which is did, more or less. The car's fun to drive, and has its share of tweaks and complaints (more the dealer than the car). I just got to a point where I decided that modifying the car would be dumb because it would soon become not very street legal, and it only can offer so much potentionl. So, as of the Z, it was downgraded to daily driver status, and I haven't modified it in over 2 years.
The idea: the stupid mod bug got me again. I put the reinforced motor mounts back in and took the filter condom off the k&n. The mounts took care of a nasty exhaust leak I had, and now the car has oomph once again (for a 2 liter pos dodge, anyways). It's approaching 90k miles (70k now) and it's time for a timing belt change. At the same time I want to pull the motor and rebuild it.
The problem: should I actually rebuild the motor with performance in mind? I will definitely do new valve train, springs, lash adjustors, etc from a PT cruiser (much stronger) and do the rings, seals, and bearings, and probably a new alum. water and oil pumps (on a neon they're gear driven). Gaskets are of course included along with the belt. Now, should I actually do something stupid like spend more money on 10.5:1 pistons, new connecting rods, reground cams and cam gears? This will cost me an additional grand or so, but should I do this to my daily driver? Also throw in 300-400 bucks for a new clutch since I'll have everything out.
downside: spending money on my neon that I could be spending on the Z. the timing belt has to be changed anyway, and I still have to tear the motor apart to replace the bearings and rings.
right now the car has a 33% smaller underdrive pulley, intake, mopar street header, mopar ecu. currently I can manage about 30mpg on avg 70% hwy 30% city driving, which is why it's a daily driver.