SVT 19# injectors + SVT MAF + SVT ECU = Looking for IMRC. The IMRC blocks off roughly 1/2 the engine's incoming air (more like 40-40% due to diameter difference in primary vs. secondary openings) until activation point. If you have "pinned" or "gutted" the IMRC, but are using the SVT ECU, the timing/fuel curves are expecting it. Thus, you are getting only enough fuel for 1/2 the air you are letting in. The "surging" is due to the engine trying to compensate via O2 readings. Fatten up the pre IMRC RPM range with fuel and play with the timing and you should be fine. DemonSVT can get more specific on the numbers to adjust to since he has done this before.
Last edited by fastcougar; 05/10/06 08:06 PM.
