RX7Elmo

for those with a FMIC using stock twins, did you notice any more lag? or pressure drop? Do you feel teh turbos have to work harder in order to produce the same boost pressure? for instance if your car was making 12psi before FMIC< what was it making directly after?

I'm highly considering the greddy FMIC. I've searched for info, but couldn't find this specific info.


Danny

RX7Elmo

bump

jspecracer7

With mine, I felt the lag(slightly) but the pressure didn't drop, it INCREASED boost because of how badly the stock system was designed. I had to turn boost DOWN.

maxcooper

Pressure drop is not a drop in boost pressure that you can measure on your boost gauge. You might see a change in your boost pressure, but the change is not equal to the change in pressure drop. Pressure drop is the drop in pressure across the IC core, and the turbos need to work harder to maintain the same manifold pressure when pressure drop is increased. Which means more back pressure. Which means less power, because there is less oxygen getting into the combustion chamber. I'm not saying anything about FMICs -- just clarifying this oft-misunderstood term "pressure drop".

I can tell a difference in lag / boost response between my stock IC and my M2 Medium IC. I'll gladly take the trade-off, but the bigger IC does slow the boost response a bit. I swapped the stock IC back in for a bit and was surprised at the change (I wasn't expecting it). I imagine it is even more noticable with a FMIC due to the volume. But again, there are trade-offs between different setups and you need to find the components that have the right balance for your needs.

-Max

RX7Elmo

thanks for the help. I knew what pressure drop is, i just worded it incorrectly. I would figure overall the system has less pressure drop but because of the increased volume boost response will hurt slightly. Probally a worthwhile tradeoff.

Danny