I recently lost a motor, new setup is built better in every way and I now have enough injector for more padding.

I'm thinking about mixtures in the ballpark of 12.5:1 at 0psi, ramping to 11.8:1 at 5psi, ramping to 11.0 at 10psi, ramping to 10.8 and holding that stready from about 13psi.


I'm pretty sure I've read that the twin power will handle that type of tune without water. I will be using R7420 plugs. How much water can I throw in and expect reliable ignition without a proper sequential CDI system?

 

With 315cc water i start to see ign breakup anytime afr dips into 10's, running twin power with bur9eq and 16psi on a 35r. I tuned for 11.0:1 and it pulls hard with no breakup. My coils are old tho, could be a factor.