Originally Posted by Tomomi (Post 3358778)

Thanks for letting me know guys. Should of known that I would need to retune it or mess around with the ecu. Ended up getting it since a friend sold it to me for real cheap lol...
Still had the same stupid idea that a bigger throttle body would make a difference, since was running an rbc mainfold with a hybrid racing throttle body with a tune on my type s. Thanks for letting me know.

Originally Posted by FunnyGopher (Post 3358975)

I too experienced the same thing you're experiencing after installing it. I got into the habit of putting the car in neutral when going over speed bumps to stop the high idle. After mentioning this to my tuner and sending a log over, it's now fixed.

Compared to butt dyno and real dyno sheets of other modified 86s I've driven, there is noticeably more throttle response and torque delivery with the larger throttle body. There's a lot of people who say it doesn't do anything and not to waste your money. My experience with it is much different.

Originally Posted by Ernest72 (Post 3359025)

Not disagreeing with you, but the butt dyno is not that accurate.

Originally Posted by FunnyGopher (Post 3359757)

I stated I had actual dyno chart comparisons showing a difference in initial torque delivery. The "butt dyno" being a metaphor for driving feel. Throttle response is a driving feel, not a peak number on a chart, which is why I felt I share my opinion on the throttle response of different 86s I've driven with a combination of tunes/no tunes and larger/stock throttle bodies.

Originally Posted by 86TOYO2k17 (Post 3359830)

This same effect can be achieved by changing the throttle mapping in the tune or with a throttle manipulating device like pedal commander. i have testing this first hand with a larger TB, pedal commander and changing mapping in the tune all individually and every combination thereof.

All that is happening is the larger TB at say 10% throttle is now open flowing more air as if stock TB was really open 15% so it "feels" like it has higher response / torque delivery when driving around but that's also why peak numbers at WOT do not change unless you have FI and have a greater demand for air than the stock TB can fulfill.

This is also why people have no throttle "coasting" high rpm/higher speed issues because it is flowing more air at zero throttle input than it was before.

Originally Posted by PulsarBeeerz (Post 3359854)

Peak number and Tq delivery won't change without port matching the TB the manifold. You have to go beyond just slapping it on. Necking a 72-70mm, which is over kill anyway in my testing down to 66mm isn't going to have the same result as a 68mm port-matched to 68mm. But this will only be effective after throwing on all the usual bolts on. It work on just about every engine as long as the TB inlet is still flared. Straight through ones no matter how larger do not seem to work NA at least.

Originally Posted by 86TOYO2k17 (Post 3359867)

If you pour a 1 cubic inch stream of water into a 4 inch diameter pipe, and then increase the pipe to 5 inch diameter, the volume of water and rate of flow will not increase as the restriction isn't the pipe size but the amount of water. its not like pouring too quickly in a funnel and the funnel slowly "fills" up and either spills over or you stop pouring.

The engine can only draw so much air, the TB size is already greater than the amount of air the engine can draw on it's own it is not a restriction hindering flow so going larger will have no effect on maximum power (unless FI) it will only change the throttle mapping up until maximum power because you will have greater airflow going through the butterfly valve of the larger TB at any given throttle position unless remapped to account for this.