At what rpm do the VDI and 6 ports open on a stock 89 – 91 RX7?
Thanks for the help

 

I believe that the six ports open around 3800 and the VDI at 5500.

 

Aux ports at 3800-3850 and VDI 5200

 

The 6 port
It goes off of pressure
opens at 0.85psi
fully open at 1.4psi

VDI fully open at 2.8 psi

 

Close...

From the FSM, 6PI is activated at 3850rpm. From Mazda's S5 SAE paper, the VDI is activated at 5200rpm.

 

I put the 89 -91 in to my 85 gslse I’m using a haltec e6k to open them I’ll have to play with it. I had at 3500 for the 6 ports and 6500 for the VDI so thank you for the help

 

oh, almost forgot people put these manifolds onto SEs, sounds fun

2 things i would like to add:

1) a certain amount of load/throttle (about half of max) is needed, i have found, for the stock ECU to activate the 6pi and VDI. this makes total sense, since you will get better response on low throttle/low load and on decel if the 6pi is closed and VDI is on the shorter runners.

2) on your SE, and depending on what mods you have, those stock S5 NA points may not be the best. it is a really simple matter to find the PERFECT point, however you need to go to the dyno.
all you have to do is get a full-load dyno run with the 6pi closed, and another dyno run with the 6pi open. the RPM at which the 2 graphs intersect is the point that you pick the solenoid to activate. something i learned from how VTEC is tuned on Hondas, lol.
oh, and keep the VDI closed when doing the 6pi testing, and keep the 6pi open when doing the VDI testing...