I need to know on the 20B TPS, which of the 4 pins is for what? I know there is a +5V, a ground, one that is not used, and the last is for something else...

So, which pin, from top to bottom, does what?

Thanks everyone.

 

Nevermind, I found Kurgan's Cosmo TPS picture he got from the Hitman.

 

yah its just like the fd too. actually 90-94? protege automatics have the same tps connector, and a similar tps

mike

 

Actually, there are two different TPS units your motor could have (at least). One has a metal cover, the other has a plastic cover. The plastic cover one is the same wiring as the FD, the metal one is allegedly the same as the picture I posted from the hitman, but I couldn't get it to work. If you still can't get it wired, let me know and I'll check it out tonight... I think there may be 3 TPS units that Mazda was using at the time.

 

whats the part number on yours?

mike

 

Mine has a metal cover on it. I will look tonight and see what the part # is.

My 20B has the older style upper intake manifold without the black anodizing on it if that helps.

Thanks, Kerry.

 

I think all 3 of us have the older style 20B. My TPS has a metal cover on it... I'll look tonight, or in the morning most likely and post the pinout and part number.

 

I took the part number off when I polished the metal cover for the tps... oops. Got a little carried away polishing

 

Correct me if I'm wrong but the 20b and the 13b-re shared the same TB right? Well if so i have some info from my 13b-re tps. One of the hoses I toook off the TB had a date on it of 4/23/92 so I'm assuming that it's a 92 or 93 model engine. The Numbers off the tps are NF01 18 911 and 198500-0540 hope this helps. Oh yeah it has a metal plate on it.

 

ive looked the 13b and 20b cosmo's have different tbodies, apparently the 20b has larger throttle blades (they are identical on the outside).
i also looked at my tps, its also NF01-18-911. i hooked it up like an fd, using the full range part.

mike

 

Interesting about the throttle plates. Are you able to measure them and see how much of a difference in mm? j/c...

 

The 2 and 3 rotor cosmo engines (allegedly from the same years at least) shared the same TPS, but not the same throttle body. When the FD was introduced, they started to mix that TPS into the flow as well...

Does anyone else have a modified throttle body that is polished with the secondary butterflies removed?

 

yeah, we have a 13b cosmo and a 20b cosmo running around. i know they have different part numbers (n390 vs nf01), and they are identical from the outside

mike

 

Each blade on the TB is 45mm or 1.77 inches for my 13b-re, all 3 are the same diameter.

 

Bing! You meant the "choke blades" right?

 

You were much too nice to your TB. I hogged mine out and beat it like a bad stepchild

 

2nd image

 

3rd Image

I wanted to maximize airflow and I ground out as much as I could without going through the casting wall. Then the holes from the TB mod, etc, were welded shut to absolutely ensure no leaking.

 

3rd Image

I wanted to maximize airflow and I ground out as much as I could without going through the casting wall. Then the holes from the TB mod, etc, were welded shut to absolutely ensure no leaking.

 

i found that you have to remove the secondary throttles, the blades will close under boost

mike

 

damn you did hogg those out

and closing under boost is a good tidbit of knowledge

 

Jesus! you did go nuts! Looks like you broke though in one area Did you weld that shut also and regrind?
Looking at your blades the secondary ones do look a little larger than the primary, is that true? What are the size of them?

 

Hey... you're pretty observent. Yes, I put about a pinhole size hole in the bottom right-hand corner. Didn't even realize it until after it was all cleaned up. Dab a spot of weld, sand down, and all is good.

Don't know about the size difference between the primary/secondary throttle plates and I think I threw the primaries out after I was done...either that or they're in a box somewhere. Not of much good anymore regardless.

I was contemplating waiting on doing the complete TB mod on this car so I could do a before/after of it with measureable results but why wait? Might as well do all of it while the motor/car is all apart yet and be done with it. I would think that the less restriction overall would improve flow. Under boost might be a different story as the entire vessel is pressurized so I'm not sure how much of a difference it really makes.