Anyone with a ctsc ac setup running 4" pulley (8psi?) on an ap1 with comptech esm and fmu?

 

Some have, but it is so far from optimal that it's a matter of when you pop your motor, not if.

 

s2000junky is running a 3.0" or 3.2" with a FMU and meth but i do believe he isn't using the ESM but just a Vafc

 

3.0" with the esm and vafc as you can see from my sig. I've done it, it works, but not ideal and I get tired of watching my gages like a hawk. I can say anything is possible but I wouldn’t recommend the set up to anyone but the most daring and knowledgeable about what they are doing. I am in the process of switching over to ID1000 injectors and Emanage set up with my multiport meth injection. More fuel delivery and tuning options there. I still get to retain the reliable factory Honda systems, which I have always aimed for

8psi with just relying on factory injectors is certainly on the cusp of what they can provide for a proper and safe afr. Some things that will help if you must, making sure you have an ap2 fpr. This fpr from comptech has a steeper fuel curve and will deliver more fuel sooner in the rpm. Limited bolt ons, as this will further increase your demands for fuel, so if you have say an aftermarket TB, or TP /exhaust it may put you over the edge and not make it possible. The only way to know is to try it and see where your afr is. I would never consider trying this without a good wideband. A vafc at min will be needed to dial out an excessive amount of fuel under vtec, which is a side effect of increasing fuel pressure to the cusp as you will need to do to be safe up top, and I use that term loosely.