throttle body swap

[cricketol2]

ok i have a dohc and sohc both are b type.. so i was wondering for any input on this could i swap out the throttle body from the dohc that has 55mm to the sohc that has 50mm and would that really do anything?

[Ryan]

There was a writeup on TB's. Search it, I'm too lazy.

Although I believe it was the BP TB that you can use. Make sure you get it from the same type of tranny you have, or you'll need to replace the TPS.

[nos92mx3]

you can swap throttle bodies on your sohc only with one from a 1.8 DOHC protege, escort,tracer etc etc.

[m-x-3]

if you put the sohc tb on rhe dohc you will see a big loss in power

[cricketol2]

if you put the sohc tb on rhe dohc you will see a big loss in power

i wanted to see if i could put the dohc on the sohc not the other why

[Ryan]

Bottom line, yes. I'm looking into seeing if the TPS's are the same. make sure you get one from a manual if you have a manual.

[cricketol2]

ok cool but then what about the idle control valve
the sohc has a added part for that icv?

[Ryan]

Not sure what you're saying. The BP and B6 TB's have the same sensors, same everything except bore.

[cricketol2]

i could see the bp and the b6 dohc to work tith tb swaps but im talking about the sohc a bp tb will work in a b6 sohc?

[Ryan]

What does number of cams have to do with anything? The intakes between all of those motors are different (because the heads are different) and not interchangeable, if thats what you mean. The TB's are, though.

[cricketol2]

ok i understand that but i looked at the online manual as far as i can tell there is an extra element for the TB... more so with the idle air valve for the sohc vs the dohc or would that really matter? note i have both sohc and dohc motors and also what are the measurable dif in the TB's in the first place? or would it just be ezer to just to get one thats bored out?

[Ryan]

They are all the same except bore. TPS are the same, given they are both the same type of transmission.

[cricketol2]

are u talking about the i dont know what u call it but the part that has the throttle cable on it? and about the idle air valve is that inner changeable (( say u have a b6 dohc with a auto trans and a b6 sohc with a manual trans can they work together? my main thing im thinking is the wiring.

[Ryan]

Okay. Edjewmication.
Let me find a picture of a throttle body...



Red is the pulley. Not sure why you'd want to change it, but I'm sure all interchange.

Yellow is a damper of sorts. All interchange.

blue is IAC. All interchange.

Green is where the TPS SHOULD BE. Automatic and Manual tranny have different units which cannot interchange, but the manuals are interchangeable, not sure about autos.

The difference between an TB from an auto/manual tranny is this:



See that wingnut type thing? that is how the auto TPS is acutated. The manual one has just a pillar. These cannot be interchanged, so one must use a manual TB for a manual tranny, and same for auto.

Also, Read this: http://forums.mazdaworld.org/index.php?showtopic=7583" onclick="window.open(this.href);return false;
I believe its in the FAQ somewhere too.


Questions?

[cricketol2]

ok cool thanks so would a TB for a miata b6 or bp work as long as its a manual trans? and the bp and b6 IAC are All interchange ? and would i get any more power and gas mileage if i bypassed the coolant hose from the tb?