How Not To Do A Double Throttle Removal
 

They were doing good until it came to filling up the shaft hole.
They threaded the hole, but evidently did not have a bolt that fit the threads.
So they stuck a smaller bolt through the hole and used THREE nuts to insure that the bolt did not come loose.

Haha. I would assume the correct way is to use a block off plate? My UIM was already modified when I bought it.

Three ways:
(1) block off plate
(2) threaded and a bolt screwed in from the outside and long enough to be ground flush with the inner surface
(3) welded up from the inside and ground flush

Thats a good one LOL...

I've got a slew of pictures like that..

Wow, you'd think they would of atleast superglued it as well....you know, just in case. :lol:

who did that one??

I used a pipe-threaded allen-keyed plug.

This gives a smooth finish on the outside, pretty flush on the inside, and due to the pipe threads, it can not screw itself inwards and fall into the engine. At the absolute worst, it could work loose and fall outside. I used Loctite :)

Similar to this:http://www.americanfastener.com/imag...hspec/318a.gif

That's just stupid and lazy. A block off plate costs all of 10 bucks.

If that. If you have some scrap sheet, you can dremel one up for nothing.

Jake Leg.

thats off my car. but i wasnt the one who did that it was the last owner.

The previous owner.

i think i did a pretty sweet job :)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/removed-welded-double-throttle-assembly-pics-571092/

Properly done or not, the mod is still gonna flow better than stock. Not everyone has access to all the neccessary equipment.

lmao @ that shit!

Do not make excuses for incompetent people, our government already does that.

wow thats funny thats why they make a block of plate for that

Silly question, but why remove the double-throttle assembly? From the 1994 factory workshop manual, page F-137:

DOUBLE THROTTLE CONTROL SYSTEM

Description
The response delay of the manifold absolute pressure sensor followed by rapid acceleration temporarily causes a lean fuel mixture. The double throttle control system prevents hesitation caused by this lean fuel mixture by slightly delaying the opening of the double throttle valve after the secondary throttle valve.
The double throttle valve is controlled by the PCME through the solenoid valve.

Given Mazda's explanation, what are the reasons for removing it?

well i believe they do it when they go non sequential i did it b/c i put mine on my fc and dont need them there

the reason for removal is because im goin single. but went we look at it we saw this and now the problem is fixed.

The reason is to remove an unnecessary restriction in the intake track.
Horse power junkies do everything to gain that last bit of power.

It was primarily installed to prevent stupid owners from trying to go on high boost when the engine is still cold.

Yup, just like the accelerated warmup system, Mazda had to 'idiot-proof' the car from the factory. I guess they know a thing or two about the general american driving public :lol:

Not comfortable with the above answers. Mazda says clearly that the reason is delay in the response of the MAP sensor causing a temporary lean mixture on sudden acceleration. How does "going non-sequential" or "going single" change that? Seems like you would need a faster-responding MAP sensor, or some other compensation for the "temporarily lean mixture," to allow removal of the double throttle.

You can't believe everthing you read. Knowledge and experinence is more important.

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Then why does Mazda need the "Accelerator Injector" and "Injector vs TPS" tables which richens up the fuel when you make sudden throttle movements to prevent leanest as you mentioned?

From page F-12 of the manual. We call it a BOV and Mazda calls it an "Air Bypass Valve". Here is Mazda's listed function for it: Reduces sound of air entering air cleaner from turbocharger deceleration. It is not a silencer but the actual valve that dumps the mentioned air.


From page F-111, the fuction of the Solenoid Valve (fuel pressure regulator).
"To prevent vapor lock during hot restart idle, vacuum to the FPR is momentarily cut, and fuel pressure is increased." You rarely get vapor lock in high pressure FI systems with pusher pumps in the gas tank. VL is really associated with carb engines with the old sucking fuel pumps on the engine block. Mine has been off for many years and living in friggin hot Houston summers, I have never never had vapor lock.

You have the freedom to be uncomfortbale. Rick and I aren't because we know more about these cars.

And indeed I do not. Than what? Do you not gain knowledge from reading? Have not seen these tables in the 1994 factory workshop manual. Would appreciate gaining knowledge from your experience. Reference? Link? Agreed, that is bogus. Might be a botched translation; a recirculating BOV is indeed quieter than one that vents to atmosphere. If you think this is bad you should have seen the differential overhaul instructions in my 1967 Datsun SPL-311 factory manual. I took issue with this statement myself, in my post #34 on this thread. Apparently you disbelieve Mazda on this point also. You mean more than Mazda does, or more than I do? If you are referring to me, no contest there. Whoever you are, you probably know more about the FD than I do.

Your point is still not clear to me: Are you saying the double-throttle system is not necessary for any reason whatsoever? Or that it doesn't work as advertised? Or that Mazda is wrong about the MAP sensor delay? Or that the MAP sensor delay is already taken care of by some other "tables?" (Please keep in mind that I do not believe everything I read.)