Custom ported and CNC throttle bodies, upper and lower manifolds by Synergy Composite

Megan370z

Not bad for 200$
I strongly suggest to do more than just boring those TB

he has another option for those TB which is TB Shaft machining. $35 each.
since you can have quite a bit more flow doing this.

its kind of odd he doesn't have a knife edged butterfly plate though...


This is what I used for the pass few years

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N0SL3N

In your opinion, as you have experience with bored throttle bodies, will I have any tuning/idle problems if I go this way?

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Megan370z

you will need to adjust the idle screw which look to be locktighted very strongly btw.

then if you know what you are doing with the tune. you wont have any problem



again,
I prefer to mention it often, you need a different intake setup other than OEM because you MUST have a bigger intake tube especialy the MAF tube. if you arent doing it right , boring a TB to his maximun as I did , you wont get much of any gain
this is boring 2.5mm out , cut the shaft in half , flush screws , arrow edged butterfly plate.

edit again ,,, if you dont have a very good flowing exhaust ... forget about this mod ! ,,

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DEpointfive0

Can you run without a tune?
No, I don't want max power. Just will it run ok without having weird idle issues and such?

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Megan370z

if you still have the stock airbox, yes you could run without a tune, but I dont recommand it at all !

but any bored out TB , you will probably have to adjust that idle screw.
I had in my case, it didnt let the engine run lower than 1200rpm

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DEpointfive0

I have G3s.
And forgive my noob-ness to this topic, but idle screw? I thought idle and such was ONLY controlled by the ECU on these newfangled cars with their computers and all?

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Megan370z

the screw is set at factory and loctited there very hard with a jam nut

then yeah you can set the idle tru the ECU.

but having it bored out, you have more air comming thru the plate because the butterfly still close at the same angle but its now bigger.
it doesnt take much to affect the idle air flow speed..


look at this picture , the jam nut on the idle screw is located on the bottom left and right of the TB.


hope thats help to understand

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FPenvy

i wonder if my current intake/exhaust set-up meets the requirements you mentioned for actual gains from a TB bore.....hmmm lol

i know my intakes are larger than stock and i believe larger than G3's so i should be good.

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synolimit

I think you'll see a gain no matter what you have. But like a tune the biggest gain will be if you do it vs not do it and you just put parts on. Better the setup the better the gain.

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FPenvy

well a tune would be done no matter what.

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler