So i've had the car for about 7 months now. Finally got my exhaust done. (No I know this is not part of the problem.) I'm just proud of it. But ever since I drove it home it feels as though the secondaries don't kick in till almost 5400 rpm. Level throttle between 60-70% and as soon as it hits 5400 it really starts to take off. It's a 1990 gxl n/a. Everythings been cleaned when I bought it it had a bad thermal sensor in the intake. (Prongs had broken off) I replace it and now i'm trying to solve this issue before I continue the rest of the project. Oh and it's a newer motor less that 50k on it.

 

You might be feeling the VDI come on, I think it's supposed to come on around that area. The transition into the secondaries is supposed to be pretty seamless.

 

VDI at 5400 is a bit early. It is supposed to come on slightly past 6k.

Do the grease test. Put a little blob of grease on the actuator rod, on the little lever that would contact the stop when fully open. Drive the car and take it full throttle to 4500rpm, and then avoid going over 4000rpm until you get home. If the secondary is working correctly, then some of that grease blob will have transfered over the little aluminum stop for the actuator that is cast onto the LIM. Use drive shaft grease or some sort of colored grease as it makes it easier to see, but you can also do it with dielectric grease also.

 

Your talking about your 5th/6th ports and VDI not your secondaries, which are injectors. You are almost surely feeling the VDI doing what it should be doing. Changing an exhaust setup can tweak where your powerband is also.

 

Yeah I thought the OP was talking about secondary injectors. You shouldn't be able to feel those kick in at all, let alone that far up in the RPM range. If you're talking about the aux ports and VDI, do the test like described above.

 

does anyone have a pic of the loc on the uim that he is talking about. I'm used to old fashioned carburated vehicles and i'm learning more about fuel injection in class at college.(doesn't cover rotaries). Just thought it was odd all that power up there. It's a huge difference right at 5400.

 

With all that power up there I just assumed secondaries. Considering the setup of the rotary. Also where are my 5th and 6th ports located. I've always been confused when that's been brought up in the forum.

 

You need to download the FSM (factory service manual) for your series and read up.