hg56

An 8psi difference is only 5%, not too bad as long and not worth a rebuild as long as it stays where it is lol, yea I just use my gauge for reference between cylinders, dont think the readings are overly accurate, but fine to see the difference between cylinders, and I do trust it sonewhat as putting a teaspoon of oil in all other cylinders yields no extra compression so those rings must be healthy. I will put some run in oil back in and do another 5000km and I will post back whether my compression goes up or down or stays the same, Thanks for your input guys!

Thanks for your reply, Yeah I hope something magically happens and fixes itself at 10000kms lol, ill do a leak down test but a teaspoon of oil brings it to 150 psi, so that says rings to me. As for run in procedure, I ran penrite run in oil, did 50-100km, changed oil and filter with more run in oil, then did a further 500 km, changed oil and filter again with more run in oil, did 500km the changed it with run in oil and did 1000km and finally put synthetic mobil 1 in at just over the 2000km mark, probably a bit over the top lol you think there would be any merit in changing back to run in oil till 10000km?

Hello, I recently built up an RB30DET with forged pistons and rods, I have done about 3000km (2000km was 3 run in oil changes, last 1000km on Mobil 1), engine runs great and got 370hp on the dyno, but I did a compression test yesterday and found cylinder 2-5 were 150psi but number 1 was 140-142psi, what I am wondering is there a chance number 1 hasnt fully bed in yet and if I leave it till 10000km it will gain those few more psi to match the othe cylinders? Or is it likely to never bed in and just get worse?

Just wanting to bring this one up again, does anyone know if Rich & Retard can be disabled through an ECU remap? And if so, does anyone know which parameter needs to be altered to eliminate it? Could it be eliminated by replacing the R&R maps with the copies of the normal fuel/ignition maps? Or adjusting the TP limit parameter? Does anyone know the hex addresses for these or any parameters that can be altered to eliminate R&R? Thanks