As the title says.

They only open up about 80% and I want to make them open up fully. Do you just loosen the nut on the back side of the secondary throttle shaft and move the cam tab? The FSM says "Bend the tab until desired clearance" but I don't see how the hell you are supposed to BEND that thing. The illustration sucks too.

 

You need 2 pairs of vicegrips that are needle nose type. clamp one on the wheel part of the throttle assembly, right next to the tab, then clamp the other on the tab itself. have some one hold the throttle wheel still while you bend the tab to come in contact with the stop, when throttle fully applied. This fixed any issues I had.

PS: awesome increase in top end power..for me anyways.

 

Okay, which tab? There is a forked piece connected by a rod to the primaries, and a tab on the secondary throttle body that the forked piece engages to open them. Do I need to bend the tab on the secondaries or the forked piece?

Thanks for the help man.

 

rip that **** out!

 

I am not talking about the restrictor plates for when the engine is cold....already disabled those. I am talking about the actually secondary throttle plates.

By the way, as a side note, I tried taking those restrictor plates out, but damn are those screws tight. I couldn't get them out

 

I don't care what anybody says, leave those plates in there. They help increase airspeed. I have raced 30 to 40 RX7s with these plates removed and I rape all of them @ the track, and 100% of these cars are street ported and most times they are also S5 cars with more power to start with and I totally destroy them @ the track, so my advice is leave that stuff in there, and just port and smooth out the existing manifolds.

On the tab subject, bend the tab to the point where when you look into the TB and you see the plates are fully opened. Have you tried having another person push your gas to the floor and see where the plates stop? I found the pedal stops the plates at a place that is not real when you use your hand to open them.

IE: maybe the cause is a longer throttle cable from age and use,, might be keeping them from opening fully? check the operation first, or you may bend the tabs and make the cable pull harder on the shaft/plates than should be.

 

I didn't take the restrictors out, just disabled them.

The secondaries (observed through the throttle bore) only open up 90% (80% I stated earlier was not correct). The car was cold at the time so the thermowax was holding the the plates open slightly and made the cable appear loose, so I never checked the actual throttle cable with the engine warm. It did however seem to fully open the primary throttle plate.

So to get this straight, I need to bend the tab directly on the secondary linkage and not the actuator for the secondaries correct?

 

They are done this way purposely by Mazda as they want the primary throttle plate to open before the secondaries. At light loads this allows only air to go to the primary ports. If you set it up so the secondaries open all the way, they will probably end up opening with the primaries which means you'll always have airflow to all ports. This isn't necessarily a bad thing. It was just done that way on purpose.