the system loses CFM without the filter there, the filters internal curved inlet increases flow, we tested this on the flowbench.




as stated earlier in the thread, even getting 2nd gear to run only a little lean does not solve 3rd, 4th, or 5th, right now i bet i can tell you what is happening...

1st gear feels great
2nd gear pulls like a freight train until the high rpms (~5500) where the afr raises into the 13's and the car noses over
3rd gear pulls like a **** until ~ 5000rpms when it noses over from high AFR into the neighborhood of 15-17:1, knock and then pulled timing
4th gear should even be attempted at wot as the problem only gets worse, same for 5th

a lot of us have been there and done this, please take this from someone that has seen more modified srt6 datalogs than i bet anyone (including those that tune ECU's) and i have seen this scenario happen 40 times.

i hope you did find the solution to this, i really do, but just that pump doesn't do it IMO

shoot over a datalog and we can discuss what is happening - rob

i dont see what datalogger you have, i hope its a zeitronix with dashdaq, if so record...
rpm
tps
afr
boost
timing
ait
ect
speed