Figured I would update this thread since I haven’t in a while. I decided to upgrade the nitrous system to help get off the line, upgrade to an 849 ECM with EFI Live, and upgrade (I hope)to a manual master cylinder.
The last few passes I made, I couldn’t get the brakes to hold boost at the line and it seemed my CTS2 was off, even though the ECM saw correct pressure... Even with 30psi at the launch it still wouldn’t hit the tires how I would like, so with a lot of advice from Phillip Franklin I decided to make some changes.
I now have a Nitrous Express Maximizer 5 and three stages of nitrous I can control. With the 849 ECM I can use a staging limiter off a button mounted on the brake pedal. I will roll into the first bulb and start building boost, once I make 10psi the first stage will come on, spraying a smallish .030-.050” jet that will help build boost faster to 25-30psi at the hit, and that should really help get it off the line. I have been just using a WOT switch, so it was fuel only for at least a few feet. Once on boost at the line I go to 100% throttle and the ECM will hold it at the boost level I choose in the tune. Then once I leave, I release the brake (and switch) and the ECM goes to full fuel and I can start ramping in more nitrous if I need it with the other two big solenoids via the MX5 and/or the scramble button.
I am thinking about starting with a .052 spool jet, and ramping in a small .036 jet either at WOT or a little before the 60ft for the second stage, it just depends what the track will hold. Then I will have the third stage for my scramble button, but I don’t see myself using that until I get a built bottom end.
I rewired pretty much everything in the truck, I cleaned up the engine harness and repinned it for the 849, then added the wiring for the nitrous activation and staging limiter. I added a mechanical boost gauge, and trans temp gauge on the shifter.
I also added a 45mm Hypergate to relieve some drive pressure with all the nitrous.