- Jun 23, 2009
Well I wasn't happy with my mileage and upped my timing to a max of 11* at cruising speeds. I took a 2,000 mile trip and now it looks like I have a hurt HG. I had a little bit of pressure after sitting over night after the trip. It an LBZ with 5k miles on new Mahle HG, studs, and decked heads. I don't know it that was the cause or what. I ran 12* of timing for years and 100k miles before/while I blew my stock HGs. I had a discussion with people experience in tuning and pressure monitoring before upping it to 12* when I was stock. I was basically told crank it up until it starts to rattle and then back it off a little bit. I didn't have any rattle at 12*. Yes it was noisier of course. Just trying to see after a few more year's of lessons learned if that's just too much time to be running. I run very low boost at cruising generally around 2psi or less. Probably a little higher than stock fuel pressure.