I've notice some 3rd Gen owners have removed the double throttle. Is this done for performance or reliability? What is it replaced with?
I'm a newbie and am about to purchase a '93. So I'm trying to learn all I can about how to improve reliability first.
Then I'll work on the performance aspect.

 

It is done for performance -- to eliminate the restriction that the throttle plates cause.

The throttle shaft and plates are simply eliminated from the car. A block off plate is often used to plug the hole that is left by their removal.

Note that the DTCS throttles are not connected to the gas pedal in any way. The throttle body has 3 throttle plates that are connected to the pedal for engine speed control.

Don't do it until you've done a ton of other stuff. It isn't for reliability.

-Max

 

thanks~

 

is there any good links to this mod, i have my TB and UIM off right now, so i figure i could fab up a plate for it, i just need to know exactly what im doing.

 

I have never really understood why people do this modification.

The purpose of the D-throttle is to reduce hesitation by introducing a slight temporary reduction in air flow to prevent the car from going too lean when the throttle snaps open under full throttle.

I suppose the hesitation can be tuned out with a aftermarket PCM but my guess would be that Mazda found the stock PCM needed help. Near as I can tell, there is no obvious reason to remove it.

Mibad, if you want to improve reliability the first thing to do is replace the miles of vacuum hose hidden under the intake manifold and while you are at it, make sure that every solenoid buried under there is functional. That is the primary source of a lack of "reliability".

The second thing to do is if your car has an adjustable PCM, have your car professionally tuned.

 

interesting, I always heard that it was there to prevent the car from going WOT before it reaches operating temps.

 

ive heard not to go WOT too soon w/ this mod, to wait till the car is hot, that would give me reason to suspect the Doublt Throttle is for a stock car to not go WOT when cold

 

It might be both. It certainly doesn't open until the car is warmed up, but that may have been more of a "hey, let's add that feature since we've got this thing anway" than the primary purpose of the DTCS.

Anyway, it is a restriction even when they are open. That's why people remove it. It probably doesn't matter much (undetectable HP difference) until you are flowing a lot of air and making a lot of HP, though.

Even with the DTCS installed, you shouldn't be flooring the car when it is still cold.

-Max

 

Double throttles are just the fuel injection version of acceleration pumps on carbs & they prevent hesitation just like that accelerator pump. I don't want to push my luck talking about carbs.

Like Maxcooper says, maybe on the Mazda the other reason may be to stop you from beating up on a cold engine.

Certainly a third reason may be that a cold engine needs extra enrichment. I would think that could be handled by the coolant temp sensor and the ecu but the double throttle may just be giving the ecu help.

Anyway, as Max stated at the outset, there is no obvious reason to rush to do it. It's still on my car and my car gets along nicely.