Touchy: One of the "features" of a bigger throttle body is that you lose low-throttle modulation. It will be more of an on/off gas pedal than before. The smaller opening of a stock throttle body requires more throttle plate opening to admit the same amount of air, so there is more gas pedal movement at low throttle.

Rich: others who have taken their cars to dyno shops have reported that stock fuel trims are very rich, even to the rather extreme ratio of 10:1 at full throttle. Hyundai programmed them to dump fuel and lose power instead of trying to conserve fuel and burning holes in the pistons.

More air: no. More air sooner, but not more air, total. To get your engine to use more air, you need to change the bore, stroke, or cam profile, or add forced induction. Pretty much everything else just gets out of the way of your engine using the same amount of air. A bigger throttle opening just takes less gas pedal to allow the same amount of air through. Great for turbo or supercharger, or wide-open road racing, but not a huge increase for an otherwise-stock engine setup in a daily driver. Actually, if you slap one on your stock DD and just go to work and the grocery and NEVER use the engine's full power, you will possibly not like a BBTB, because of the loss of low-throttle modulation.

 

Wow, couldn't have asked for a better explanation, thanks Stocker.. Honestly I've just been finding reasons to take things apart and put new things on lol... I pulled the throttle cable back so now I don't have to push the pedal 3 inches before I get throttle response... It's amazing how much of a difference this made, the car now is throwing itself into gears, (I don't feel like I need to push hard to get it into gear when racing) and just the throttle response alone seems to making the car take off a little faster...

 

That is not an RSide, looks more like a Tigerlilly BBTB, that he drilled out. There were some years with a different IAC still, so this could well be that one.

And for losing low end with a big BBTB, I've got a 65MM BBTB, and my low end is still fantastic. You can ask anyone that's ridden in it, or been around it.

 

I knew that was gonna come sooner or later, but it is true.

 

Not low-end power, just low % throttle plate modulation. The throttle response is faster because the hole is bigger. Low end power is still dictated by the engine, along with the intake and exhaust tubing diameters & lengths.

 

I took the TPS off of the stock TB and put it on the new TB because the newer one had a different TPS... the TPS said hyundai so I know it's for a hyundai, just not sure what model

 

correct. if you want to sum up that whole claim into two words it's called "Engine Efficiency" if you google it it'll explain it all in detail. basically the only way is as Stocker mentioned, or "stuffing" (compressing) air into it.

i'd like to get myself a smaller cai, maybe a 2'' instead of 3'' to increase the vacum. then there's that dern maf housing.