just installed 1zz throttle body

[2009Toyotoad]

Forgive me in advance and tis are newbie questions, but I'm confused. If the route to forced induction via turbocharging calls for bigger injectors and a bigger TB, but invader166 is indicating than the bigger TB only benefits top rpm performance how is Turbo charging the 1NZ-FE of any benefit on the street where Mid range is used most of the time? I hope I'm not asking a foolish question, but the responses are leading me to the conclusion that turbo charging the engine isn't going to give me more power across the power band, or if it is, a significantly lower compression ratio is needed to achieve that power which will eat up fuel and remove any economy from the vehicle. I'm really confused.

[WeeYari]

Originally Posted by 2009Toyotoad

If the route to forced induction via turbocharging calls for bigger injectors and a bigger TB

Where are you getting that information on the TB from? Most S/C and turbo implementations on the 1NZ that I am aware of have not touched the throttle body. In a lot of cases, yes larger injectors have been installed, but stock TB is left in.

[2009Toyotoad]

Originally Posted by WeeYari

Where are you getting that information on the TB from? Most S/C and turbo implementations on the 1NZ that I am aware of have not touched the throttle body. In a lot of cases, yes larger injectors have been installed, but stock TB is left in.

The Zage Turbo kit has the additional option to be run with the 1ZZ TB. I'll see if I can find that link again. I thought it a little odd myself but as I indicated I'm just starting to understand the route to forced induction on the 1NZ-FE.

[invader166]

Originally Posted by WeeYari

Where are you getting that information on the TB from? Most S/C and turbo implementations on the 1NZ that I am aware of have not touched the throttle body. In a lot of cases, yes larger injectors have been installed, but stock TB is left in.

WeeYari's right. You don't really NEED to have a bigger size throttle body if you're going the forced induction route since I think the Zage turbo kit and Blitz supercharger are designed to work with the stock TB. At the same time I don't think that would that really hurt anything either. My idea was that a bigger TB would reduce restriction, and thus increase the efficiency of the supercharger or turbocharger. I don't know for sure if you'll be seeing a huge gain by doing that though.

However, if you were to get a bigger size turbo or supercharger that can supply the engine with that extra air that the TB allows for, your could be seeing some big numbers. (with proper tuning of course)

Can you imagine, fitting a GTX turbo designed for a 1.8L corolla on a yaris.

[scod4025]

Ok so with a TB on a N/A engine you wont see much of an increase of power and will likely see a drop off in the low rpms but you will have a quicker throttle response in the mid range and will be able to have a better top speed and performance in the high rpms, But when you start getting into F/I you things are a bit different as to with a turbo you will see the gains in the same areas as a bigger TB but at larger amounts with the supercharger you will see the increases at the lower rpm range and will fade out at the high rpms so it will depend on the type of driving you do most daily drivers will benefit more from a S/C then a turbo and they can see increase in gas mileage depending on how the system is set up. Now for people that would like to have their cake and eat it too there is double charging which will give you both a S/C and a turbo but these systems are complicated to set up as to if you want them in series or in parallel and have to double your air cooling capability

so it really depends on what you want to do with your car just need to get it set to how you want to drive your car and what you are willing to sacrifice, be it engine longevity, high rpm, low rpm, or cash

and everyone else please point out things I missed or might have gotten wrong