Yes, I have tried searching. I was wondering, what activiates the VDI 5th and 6th ports in both series 4 and 5. IF you could answer me that it would be great.

-Evan

 

Series 4: exhaust back pressure activates the aux ports, no VDI in series 4 motors

Series 5: air pump and electronics (solenoids and ECU) activate both VDI and Aux ports

 

i am not sure what series i have. Because when i got the car, it had a new engine. I guess i have to look up the serial number. What is VDI? if i have a series 5 i can remove the cats and keep the air pump?

 

anyone?

 

VDI stands for Variable Dynamic Intake. The intake runners on the 89-91 RX-7 are two lengths, when VDI is not active, the intake runners are long and when it is active, they are short. This is the simple explanation. The length of the intake runners are tuned to maximize torque and HP at low and high RPM.

If you have a Series 5 RX7, then you will need to keep the air pump to actuate the VDI and Aux ports properly.

 

how do i know if all the 6 ports are running? it doesn't seem to have any power loss all through the revs...just keeps on pushin...up around 6500 tho it doesnt seem like it wants to go any faster in 1st

 

do U know?

 

If you have a series 4 car then it sounds like everything is working properly. I might question the performance if it was a series 5 though, but if you have a stock exhaust, your motor won't rev all that much anyway.