why are there two coolant hoses going to the throttle body? is it to further cool the air coming from the intercooler? or is it to keep the throttle body cool from the heat produced by the motor?
nick

 

It is to warm the throttle body in winter conditions.

 

actually, it keeps it warm

the coolant is called coolant to cool the engine but in fact, it gets really hot.

it goes around the TB to prevent ice from forming and making the butterflies not being able to close. It is useless if you are from the south but if you take your car in sub freezing weather, it is usefull.

puma

 

Does water flow through the tb to warm it . go look, or does it just warm the Hot Wax Rod for the fast idle cam . Look for your self I may be wrong. Do look, I think it does the hot wax rod ,not the whole casting. I do not remember a water jacket around the TB .

 

i beleive it does both.

might not go all the way around the TB but it goes close enough to warm it.

 

i don't know which hose is in and which one is out, but there is a coolant hose that goes to the bottom front of the tb and one that goes into the top corner (towards the firewall) off of the back of the tb. after reading your replies, i would think the coolant goes through the tb to warm it. sometimes i wonder what the mazda engineers were thinking when they built this car, did they expect to sell it in the north pole?
nick

 

i have mine bypassed.

 

well we have some in canada and we have below freezing temperature. I know someone who used to drive it the snow.

 

Yea and actually most cars have coolant going thru the tb. Its not just a RX7 thing.

STEPHEN

 

I am in Iowa and also have it bypassed but dont drive it too much in cold weather but when I do I have no problems at all.

Steve

 

thanks for the help guys. i'm gonna bypass it too.
and i know that there are fd's in cold weather, i guess i just have a dull sense of humor and you guys didn't pick up on the sarcasm.

 

Its really easy, all you have to do is disconnect the hose at the top of the tb thats next to the firewall and just route it under the uim to the back of the water pump.

Its easy

STEPHEN

 

yeah but you need to remove the spring on the hot wax rod too.

just check rob robinette's web site.

you might have lumpy idle at cold too, i had to adjust my idle after i did that.

but removing the manifold is so much easier now. No coolant on the floor again when i remove the manifold.

puma

 

Oh yea, thanks for mentioning that...I forgot to mention it

Which brings up a point really. Most of you guys running this mod, did you remove the spring then screw the screw in all the way or did you do the "tie back" method that Rob used?

STEPHEN

 

I tied it back but also put the screw all the way in just in case the tie ever comes loose.

 

i removed the spring and put the screw all the way in

 

what exactly does the spring and the screw do?

 

Unless I missed something... Is there some reason that you don't want to use the TB heating?

My concern here is that people seem to be removing a lot of things that Mazda Engineers put in for some purpose. I cannot claim to know if these parts are needed or not because I am not a mechanical engineer - but could this be the reason (not necessarily this case) that our engines are going *pop* so prematurely?

Why are you bothering to bypass a heating element that is doing you no harm - especially if you are not fully sure what that part does?

 

Because it HEATS the throttle body. Mazda Engineers were probably not concerned about HP as they were about people driving their car in the cold.

If you live in FL or drive your car only in the summer, then why have the throttle body heated? It's there to make sure the throttle body butterflies don't get stuck.

 

OK, I guess I can see that, maybe I am the only one who drives my car from Florida to Maine year round; and therefore needs all to engineering.

Also, I guess you guys are not at all concerned about resale?

 

from what i know, i do not need it. alot of things removed are not needed. emissions is a big PITA and not needed. the car was ment to pass all emission testing. most things (not this one) removed are emissions BS and some of us dont "need" it.
i doubt that an air pump, or other emission BS or bypassing the coolant to the TB is the reason....

i *think* i undrestood what it did before removing it. it serves no purpose to me and actualy adds to the mess under the hood. as far as harming... i dont know if my theory is going to fly to well, but if i have nothing to help *warm-up* the car, and the double throtle removed, then i dont need the heat via this part of the *coolant* system adding to the mix. i feel that it may actualy add a degree or 2 to the intake temp (maybe not). isnt that why we use larger intercoolers...to keep the intake temps down? someone please let me know how my theory hold up in real life.

 

RESALE? You have got to be shitting me?!?! I removed the unnecessary crap that the car came with because I work on my car. I DO NOT do stuff like this so that I can turn around and re-sell her.

 

lmfao!! i agree.

 

the reason why i started this thread was b/c when i was doing the hose job i found the bottom hose off the tb to be cracked and sealed on the nipple. i tried going out and getting coolant/heater hose from an autoparts store, but when i put it on it seems that the hose i need is a special order hose. i couldn't get the hose to bend w/o kinking, the turn was too tight. so i thought about bypassing it and came to the forum to find out what exactly this coolant hose does. that's what the forum is for, to get answers.
nick

 

the only thing the coolant does in teh throtle body is to adjust your idle speed and open and close teh throttle bodies, has nothign to do with throttle body being warmed, taht is a side effect.