yes i ordered the 2timer also thinking it would b easier to burn two cals and not have to pull chip everytime to fine tune the cal.i think i understand the offsets and how they work i just cant wait to get it all up and running.what would i need to be able to have a laptop in car and change values on the fly is that possable?i have a Zeitronix ZT-2 & LCD Wideband, afpr and a RRR coming this week to and i think im going to try some dsm450 injectors.18psi is all im going to run till i get the t4 turbo rebuilt then run around 26 psi.
I haven't tried the 2 timer yet (although I have one), as there are traces on the LM that connect pin1 and pin2 of the EEPROM. I haven't had time to check out where those traces go or why they're there. Smec's may be different, but a word of caution, you may end up grounding something with the 2 timer that you don't want to. You may also have clearance issues with the 2 timer in a smec.
If you're going to run a custom cal a RRR probably isn't worth the money, as you have full control over the fueling. The RRR is really just a hack, a cal with properly scaled fueling is the better solution. Widebands are always a good idea though, I'd be lost without mine.
For our ECU's changing values on the fly is really only possible with a romulator such as the moates.net ostrich.
I run 20psi on my CSX with the factory intercooler/turbo setup, and a 3 bar +40 cal so you should be fine @ 18psi. My car has been taking a hellish beating at that PSI level for almost a year now with no problems although my clutch is about to give up the ghost.