gude-head-1NZ-FE

[H3LlIoN]

ignore this talk. what these two are talking about only pertains to about 4 users here. you should pay it no heed.


and EVERY 17 year old kid in the world has a diced out civic...how many people u know with hopped up yarii? makes a much better sleeper, and the "wtf??!?!?" looks are priceless.

[xbgod]

H3lion is right there are a select few of us that are way on the extreme side of the house with our projects. And some of the stuff we discuss pertains primarily to us, so unless you plan on going way into the deep end like we have just use some of this information as food for thought.

Our vehicles are not daily drivers and we use them as race primarily. Any questions you may have related to performance please ask and one of us will help you with your situation and demands you have for your car.

XBG

[Focus_Sh1ft]

Originally Posted by xbgod

H3lion is right there are a select few of us that are way on the extreme side of the house with our projects. And some of the stuff we discuss pertains primarily to us, so unless you plan on going way into the deep end like we have just use some of this information as food for thought.

Our vehicles are not daily drivers and we use them as race primarily. Any questions you may have related to performance please ask and one of us will help you with your situation and demands you have for your car.

XBG

Agreed. ilikerice, there's no need to be concerned with cams/vvti unless you're going for a big build. I can tell you firsthand though a turbocharged yaris for daily driving is sex

Originally Posted by H3LlIoN

and EVERY 17 year old kid in the world has a diced out civic...how many people u know with hopped up yarii? makes a much better sleeper, and the "wtf??!?!?" looks are priceless.

Agreed even more. Anyone who mods cars/ understands the process has given me great respect. Toyota techs have been stupified after looking at my car.

[advocate]

Originally Posted by H3LlIoN

and the "wtf??!?!?" looks are priceless.

QFT

[xnamerxx]

Originally Posted by ilikerice

all this talk about vvti is making me think that its a P.O.S. for performance and only good for gas savings (of course thats what the yaris is all about)... having doubts about the upgrades i decided to go with now and thinking i should stop with the yaris and see what else is out there to start a new project on... someone give me a reason to throw a kaaz lsd and supercharger/turbo on this car... cuz this talk about tuning the vvti is really throwing me back.. vtec on the crx is so much more simple.

VVT-I is amazing for what it was designed for. You get all the benefits of low rpm torque with high rpm power, before the days of variable valve timing you had to choose one or the other.

The vvti in this car is vary similar to the vtec-i the k series motors from honda have. The problem with vvti in this car is the cam profiles are tuned for a naturally aspirated motor and at higher rpm the vvti is programmed to act has a bigger na cam and increase the lobe overlap for scavenging the exhaust to increase power in the higher rpm band, but doing so would cause you to lose boost in the higher rpm range and kill the power a bit. Forced induction cars dont like to have overlap as it decreases volumetric efficiency because its basically a vacuum leak within the cylinder itself which will drop down the boost #.

The vtec in a crx is a very simple system its advances and retards the intake cam iirc which can provide some benefit but is more effective for fuel economy.

If you want to boost the yaris go ahead and do so the vvti wont have as large of an effect as it will on their cars. Remember when there talking about making 30 psi they engines are making 3-4x times more power then yours and vvti "may" cause a 3-10% drop in power/torque when boosted and making 150-180 hp wont matter so much because it wont be noticed but when your engine is making 300-400 and only has a smaller band of power that hit in power is much more noticable. Dont listen to their talk about vvti as it doesnt pertain to you.
Its like listening to engine tech from a f1 car while its correct it doesn't pertain to your application since you aren't going to be running as much power

[xbgod]

Blownxa

Working on some tunning tips like we discussed. Rolo my tunner at CFT is familliar with your situation and is doing some of the exact same things for tunning my car. I sent you a PM, give me a ring got something to discuss with you.

Aras

[cali yaris]

cuz this talk about tuning the vvti is really throwing me back.. vtec on the crx is so much more simple.

go Honda!

[Bluevitz-rs]

I never thought about unplugging my VVTi solenoid when I was boosted to see if it would have fixed my high RPM power problem. It was such a simple thing I overlooked. As the RPMs raised, the overlap got bigger and my boosted power dropped off. Makes me think if I was simply loosing fuel and some boost out the exhaust.

Because I know for a fact that running the car without the VVTi plugged in, in NA form makes for a more linear power delivery, and a lot more consistent.

[ilikerice]

thanks for the advice guys and i do understand they are probably going way far and beyond what ill ever achieve with a yaris. its my first time actually disecting vvt.. i know how they work and have always understood how to repair them and diagnosis the problems with them, but i never tried to manipulate them before like you guys are doing. i have never worked for honda or acura but i have been a crx lover since i was 15 and its been my car for the past decade now and i know vtec heads inside and out.

bottom line. im trying to read all this info you guys are saying and getting myself prepared if the day ever comes that i throw my engine management and start playing with vvti. in the honda world, cams make a HUGE difference in performance.. but from what i have read, cams are more of a headache then anything..

[xbgod]

Here...........hook one of these up to the head!!!!!!!

Extremely modified Weapon-R sheet metal intake manifold with a 70mm Edlebrock Victor-X T/B and direct-port NX kit.

[Parmas]

Or else put a 2ZZ intake with 70mm t/b :)

[sito]

Originally Posted by Parmas

Or else put a 2ZZ intake with 70mm t/b :)

Parmas, does the 2ZZ intake manifold fits 1NZ-FE engine?
Need some modifications right?

Thanks!!!

[Parmas]

Originally Posted by sito

Parmas, does the 2ZZ intake manifold fits 1NZ-FE engine?
Need some modifications right?

Thanks!!!

It not plug and play for sure. You need to re do the intake flange and match the mounting screws and you're done!

I will try to begin to fit it next week according to the man in charge!

[H3LlIoN]

FYI that's for overseas yarii only. USDM are DBW.

edit: I guess you can just get the usdm dbw 1zz setup...lol

[heeroyuy01195]

I don't mean to bring back an old thread but did you manage to figure out your EMS situation?