I just installed a new TPS (throttle position sensor) the other day since the High end sensor was probably defective on the old one.
Now I am able to full throttle, but for some reason it's not always or under certain conditions which I did not yet identify.
I have a HKS air filter installed and a tornado fuel saver installed on the stock intake hose.
One guess I have is that the after market fillter is letting in too much air where the factory fillter is a high presser intake.
The other is that the tournado is causing a interuption in air passage.

I haven't exactly had the chance of experimenting without the tournado installed.

has there been any problems with the HKS fillter for any N/A drivers?

currently I can floor 3/4th way down but once it hits that limit it seems to loose power and which sounds like getting too much air or too little or not enough fuel.

 

Too much air is not going to cause a problem, if that was true turbo cars wouldnt exist. I really hope you got that tornado thing for free.

Have you changed your fuel filter?

 

First- welcome to the forum.
2nd- You could have saved your money on the "tornado". Research the forums & you will find discussions on many other ineffective gadgets. You're not alone.
3rd- The RX-7's ECU program is generally on the rich side, so too much fuel is more common than fuel starvation, unless your filters are clogged.
4th- Check the secondary aux port actuators (sometimes called the 6-ports) to see if they are stuck.

I have a mirror copy of the FSM in PDF format at the link in my sig.
Download & print whatever you need.

Like was said, check the fuel filter on the lower left firewall. If it's old, change it.
Also pull the fuel pump (under the rear carpet) & check the pickup screen (sock).

 

Is the filter just a stock sized replacement or did you go to a cone filter or something similar?

If it's cone or something you may not have enough flow through it (ie. too small). If it's a stock sized replacement it should be fine.

Check your black plastic intake pipe, it may be leaking under full load and causing air that the intake sensor is missing leading to a starvation issue.

Fuel filter too like the others said.

 

The Tornado has been dyno proven to limit top end power on a FC, that would be the first thing to remove.

 

ok with some new results, I noticed that removing the Tornado is not much difference, should have research about it too more, but oh well too late now, lol.
second I probably should have replaced the fuel filter a while ago I think it's kinda old too, I though about that too last night.
I check the valves/ports today it doesn't look like any are missalligned or stuck but not 100% sure.
and most important of all it seems to work fine after starting it from a cold or semi cold state. after warming up properly I could get about 1-2 times of full throttle and after that it sounds and feels as if it's choking, when I go beyond the 3/4th mark. I though about a possibility of maybe the air flow meter AFM possibly defective?

oh and thanks for the warm welcome and the advice. This is the first time I've actually started to write and check out these forums.

 

did you tune the tps?

 

I just installed a new tps from a 90' non-turbo and from the feel of it, it made a big difference from before.
Tuneing the tps? I'm not sure how to do that.

 

Here:
http://fc3spro.com/TECH/HOWTO/TPS/tps.html

note: it may be slightly different since yours is NA s5 and this is for turbo (s4 i think) but the idea is the same

 

hey thanks for all the previous advices. I just got through with replacing my fuel filter the other day. I noticed a increase in response, however I still have the problem of not being able to floor it. It behaves the same way as before, where I could floor it without any problem after starting it and depending on how long I hold it open, I could get to maybe 2nd gear with full throttle, with maybe rev of 4-5k rpms each gear. after that it goes back to it's limit of 3/4th of opening it to full.

I noticed a suggestion of checking the fuel pump pick-up screen which I haven't had the chance to do yet, (also what is the pick-up screen?)
could the other posibility be that the airflow meter is defective?

Well thanks again, slowly getting there to full throttle, lol.