Secondary throttle plates don't open all the way

need RX7 · 01-30-2009, 02:42 AM

I have my TB off the car at the moment, and I was playing around with it today and noticed that if I open it to WOT, the secondary plates don't look like they're rotated 90º relative to the closed position. I reached in and I can move them the rest of the way by hand, but they spring back to being slightly off when I let go. Any input on this? I also have done the TB mod so I have no thermowax or any of it's associated hardware.

EDIT: The primary opens fine (90º from closed)

need RX7 · 01-30-2009, 11:53 PM

Well I did some searching, and apparently this is normal.

RotaryProphet · 01-31-2009, 02:21 AM

I added some weld material on the linkage that pushes the secondary plates so that they would start opening sooner, and open all the way. I'm not sure if that's the standard method of fixing it or not, just what I came up with one night.

Rotary_Rocket_87 · 01-31-2009, 09:05 AM

why not just get rid of the secondary plates like the TB mod suggests. I did this and my car seems to breathe better.

RotaryProphet · 01-31-2009, 11:05 AM

In my case at least, those are already gone; when I say "secondary throttle plates" I mean the throttle plates that control access to the secondary runners & ports.

Max777 · 02-01-2009, 11:55 PM

lol, I fubared my TB after I did the throttle body mod... so I had to get another. Now, I'm weary of doing it again...

PS: I heard of doing the tb mod where you remove the seconday plates, the rod, and the vaccum diaphragm, but leave the thermowax in. This allows the car to idle when it's cold...

need RX7 · 02-02-2009, 01:52 AM

Just to clear it up, by secondary I meant the other main 2, not the ones that you get rid of with the throttle body mod.

01-30-2009, 02:42 AM	#1
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI iTrader: (0) Posts: 485 Rep Power: 17	Secondary throttle plates don't open all the way I have my TB off the car at the moment, and I was playing around with it today and noticed that if I open it to WOT, the secondary plates don't look like they're rotated 90º relative to the closed position. I reached in and I can move them the rest of the way by hand, but they spring back to being slightly off when I let go. Any input on this? I also have done the TB mod so I have no thermowax or any of it's associated hardware. EDIT: The primary opens fine (90º from closed) __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress. Last edited by need RX7; 01-30-2009 at 02:44 AM..

01-30-2009, 11:53 PM	#2
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI iTrader: (0) Posts: 485 Rep Power: 17	Well I did some searching, and apparently this is normal. __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

01-31-2009, 09:05 AM	#4
Rotary_Rocket_87 2nd Generation Freak Join Date: Mar 2008 Location: Chuck Vegas, NH iTrader: (0) Posts: 64 Rep Power: 17	why not just get rid of the secondary plates like the TB mod suggests. I did this and my car seems to breathe better. __________________ '87 TII- full emissions removal, a/c removed, FPD removed, dual 12" e-fans, Rotary Performance FCD, ACT unsprung 6 puck w/ Xtreme PP, custom open 2.5 inch exhaust, custom clutch pivot ball, K&N cone filter, TB mod, RB downpipe, motor blown 8/7/09 '94 Mazda B4000- POS beater truck, stock "The easiest way to fail is to never try." - Me

02-01-2009, 11:55 PM	#6
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	lol, I fubared my TB after I did the throttle body mod... so I had to get another. Now, I'm weary of doing it again... PS: I heard of doing the tb mod where you remove the seconday plates, the rod, and the vaccum diaphragm, but leave the thermowax in. This allows the car to idle when it's cold... __________________ Rotaries:They are NOT that complicated!

02-02-2009, 01:52 AM	#7
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI iTrader: (0) Posts: 485 Rep Power: 17	Just to clear it up, by secondary I meant the other main 2, not the ones that you get rid of with the throttle body mod. __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

01-31-2009, 02:21 AM	#3
RotaryProphet Rotary Fanatic Join Date: Sep 2008 iTrader: (0) Posts: 147 Rep Power: 17	I added some weld material on the linkage that pushes the secondary plates so that they would start opening sooner, and open all the way. I'm not sure if that's the standard method of fixing it or not, just what I came up with one night.

01-31-2009, 11:05 AM	#5
RotaryProphet Rotary Fanatic Join Date: Sep 2008 iTrader: (0) Posts: 147 Rep Power: 17	In my case at least, those are already gone; when I say "secondary throttle plates" I mean the throttle plates that control access to the secondary runners & ports.