This is cool. What suspension are you running? Is it maxed out?
I have Koni yellows up front, Tokico HPs out back in sectioned strut housings with AFCO 2.5" springs, 200lb/in front, 250lb/in rear. Heim-joined front LCAs, Extended TCs, CC plates. Everything's solid or poly. About 7/8" sways front and rear.
I'm not sure what the Konis are valved at currently, but it really dials out the understeer that Zs tend to have paired with the stiffer rear.
I'd like to eventually section the front housings about a half inch more, go with the same struts front and back with adjustable valving, then cut off the old spring perches and weld threaded sleeves for some height adjustment, true coilover. Not sure what to go with. I'm curious as to what the struts/springs are for the AZC coilovers.
There's a place up here that will rechrome but wanted to get an idea of cost if they quote me something ridiculous. My bumpers are pretty good except under the original black rubber
Noticed a small squeek rattle on the LS1 motor so chasing that down. Autometer tach not working right. Going thru different springs, have Tokico Illuminias with their springs and didn't like the ride height so put the originals back on and after a week the original 38 year old rear springs are sagging bad.
Car seems really fast and haven't even pushed it yet...having an accurate tach would help.
If they charge you more than say $350 for both, and it's not an absolute show-car chrome job, then you're getting gouged I'd say.
It's probably a simple problem with the tach because it's not like you're running the engine through the old Datsun tach. What's it doing? Bouncing around? Seems lower than what the engine sounds like it's running? I know some of them need a resistor in-line.
Those Illuminas are hard to set up just right. That's why Tony opted for the non-adjustable HPs because they have a good baseline. I'm not sure what the spring-constant is for the springs that come with the Illuminas, but you might try looking around at pairing some other brands with them since they're not too expensive.
What kind of diff are you running?