Ok, i bought a apexi pfc, and 750/1680 injs. I installed the 1680s but need the 750`s rebuilt. I have a rtek 1.7 and a safcII temporarly. Can i turn the 1680`s down to 1000cc... My calculation is 1680 x .41 (-41%) would put me at 991cc . My question is i ran 720/890s before and maxed the 890 duty cycle out wBnr stage 3. I have the 550/1680 in right now. I also have the timing ret. -2 degrees.

My mods-
FMIC
MBC
aem wideband
deadbolt s5 hybrid ( similar to Bnr stage 3)
fuel pump rewire
supra TT pump
3" rb exhaust
retk 1.7
safc II

 

Forgot to mention that i cant get the pfc tuned till next summer sometime is another reason for doing this. Im tired of taking my intake of and on all the time... im running out of o-rings..lol