1ZZ throttle body

[aucorium]

hey guys

please explain how the throttle body works better on the yaris ? does it give better power ? if so , i wanna try fitting it to my 1300cc 2NZFE , as so far , all the 1500cc aftermarket parts work on mine. has anybody got good experience in changing it and what differences they have felt ?

[ozmdd]

The idea of a larger TB is that it allows greater airflow volume into the intake manifold. This should increase HP slightly. You'll need someone who knows more to tell you what part of the powerband it affects most, though I hear reports of people's butt dyno thelling them the midrange is better.

[thebarber]

are you dbw? i have an extra 1zz throttle body if you wanna buy it...

[hatchbackkid82]

This mod is good if you can get it to work, i think there are only a hand full of people that have done this sucessfully. I had it on my car, it did help the mid range, but it started throwing CEL's and started oscillating. I had to take it off. If you get it to work great, i just wouldn't mess with it though. Too much trouble for one mod

[jt258]

mine oscillated until i did the throttle body bypass that stopped immediately.did the 1nz chip swap. my stopped throwing cel after 3wks.

[tk-421]

In my case it has been a pretty cool mod to DIY. The only real PITA was getting the hose to fit. I swapped the chip and bypassed the coolant line. I've never had any CELs and it's been running strong for at least 5000kms. I do get a high idle (~2.5K) for the first couple of minutes and some oscillation (~500 RPMs) when warm.

The car feels more responsive and it is most noticeable in the mid to high range.

[thebarber]

The only real PITA was getting the hose to fit

you can rotate the inlet connections on the tb to match the angle of the 1nzfe throttle body

[Gideon]

The Yaris throttle only opens to 80% at WOT IIRC, so anything of a larger diameter will be limited as well, although you're increasing the amount of air to the engine regardless.

My 1ZZ TB has been on for over 5,000 miles with no issues. No chip swap, I just let the ECU do it's thang. No CEL either, although I had one initially so it might have gotten tired of displaying it on the cluster. :iono:

I have a high idle like tk when cold, (2.5K) but it goes away when the engine warms up.

[frownonfun]

are you dbw? i have an extra 1zz throttle body if you wanna buy it...

i think i've asked you this before but how much?

[PHXDEMON]

I had a hell of a time with the mod. Loved the extra power/response but after 2 weeks of messing with it and having horrible issues with oscillation and CEL's having to get my car towed 25 miles after my engine suddenly died and then refused to idle after work I gave up and threw the stock throttle body on.

[Kioshi]

This is one mod, even though I'll get help from my mechanics on this, still am afraid to mess with. I need my car practically everyday due to school and work.

I'll avoid this till further down the road a easy slip on, slip off solution is worked into this 50/50 worry free modification.

[aucorium]

mmmm , thanks for all the info guys , gonna see how my car goes after i do the K&N typhoon intake , DC sports header , and the full de-cat and 2" exhaust.

anybody got any idea of aftermarket cams ??

[thebarber]

mmmm , thanks for all the info guys , gonna see how my car goes after i do the K&N typhoon intake , DC sports header , and the full de-cat and 2" exhaust.

anybody got any idea of aftermarket cams ??

http://www.microimageonline.com/forums/performance-mods/255-gi-custom-cams.html

[hatchbackkid82]

Just leave the stock TB on, it's too much of a PITA for like 2-3 hp

[JapRulezz]

mmmm , thanks for all the info guys , gonna see how my car goes after i do the K&N typhoon intake , DC sports header , and the full de-cat and 2" exhaust.


i own a 2NZ-FE and the K&N typhoon is nice , but i dont think it yields 4.5 HP like the 1.5 version... i think the exhaust will be a good mod with the intake
but i cant stand that loud noise on small speeds

[YarisPR]

Just leave the stock TB on, it's too much of a PITA for like 2-3 hp

I wouldn't call 4 bolts and some coolant line a PITA....


Do it It won't take you more than 30min. for 2-3HP

[hatchbackkid82]

You're right, it was a simple install, but the issues that come along with this mod aren't worth the mod itself IMO (Oscillation, CEL, No smooth transition into DFCO, and one members car just shut off if remember right) The install time is short, but trying to get it to play nice withthe ECU is another thing. Don't get me wrong thoug, If i could throw this TB on and not have any issues i would have kept it on, but i had the first 3 problems that i mentioned above. So it had to come off, i think there are only a handful of memebers that have done this sucessfully

I wouldn't call 4 bolts and some coolant line a PITA....


Do it It won't take you more than 30min. for 2-3HP

[t0m4s]

sorry but
what's PITA? DFCO? IIRC? and WOT?

[frownonfun]

PITA = pain in the ass

DFCO = deceleration fuel cutoff

WOT = Wide open throttle

IIRC = i have no idea

[t0m4s]

PITA = pain in the ass

DFCO = deceleration fuel cutoff

WOT = Wide open throttle

IIRC = i have no idea

:thumbsup: thanks!

but IIRC is "i have no idea"?

[frownonfun]

no lol i meant i really have no idea


i'm thinking it means "if i remember correctly" but i'm not certain.

[thebarber]

IF I RECALL CORRECTLY

[t0m4s]

thanks =)

[YarisPR]

PITA = pain in the ass

DFCO = deceleration fuel cutoff

WOT = Wide open throttle

IIRC = i have no idea


This maybe explains why my car sometimes cuts-off while driving it hard. Hmmm interesting. Any idea on this?

[frownonfun]

no the dcfo is when your fuel gets cut off while decelerating in gear... thus saving you gas. as far as getting "cut off" when driving, the only i'm thinking that good be is when you hit 115mph.

[YarisPR]

no the dcfo is when your fuel gets cut off while decelerating in gear... thus saving you gas. as far as getting "cut off" when driving, the only i'm thinking that good be is when you hit 115mph.

So I'm back to the same spot, my car cuts-off randomly at 5000-6500rpm in third gear, sometime in 4th and never reaching near 115 :confused:

[t0m4s]

my car was shutting down when i was reaching 140 km/h and let out the gas pedal

[ozmdd]

I wonder if any of this is related to the ECU settings being different for the Central/South American markets relative to the US? Of course, Puerto Rico is US, so are the cars US-spec?

[YarisPR]

I wonder if any of this is related to the ECU settings being different for the Central/South American markets relative to the US? Of course, Puerto Rico is US, so are the cars US-spec?

Yes they are US spec. We only get more colors to choose from :biggrin:

[hatchbackkid82]

Wait Yaris PR, your car is cutting off when you drive it hard and you have the 1ZZFE TB?

[YarisPR]

Wait Yaris PR, your car is cutting off when you drive it hard and you have the 1ZZFE TB?

It has been cuttin off with and without the 1zzfe TB. That's the problem, cause if it was only with the 1zzTB I would blame the TB, but it has done it with the 1nzTB also.

It cuts-off the check engine lights blinks for a few seconds. The light goes off and the car continues normally. :confused: I think my car is a real biatch!

[hatchbackkid82]

what? damn i don't even know what to tell you. i was going to say that it could be the 1zz tb but if it's doing that stock...then i don't know. Anyone else have any idea what may be causing this?

[t0m4s]

scangauge? any code? maybe it's a leak or gasket or a sensor

[ozmdd]

What other parts of the car have you changed/moddoed in the past? this sounds like it might be something screwing-up one of the sensors.

[advocate]

sorry but
what's PITA? DFCO? IIRC? and WOT?

Pain in the ass
Decelerating fuel cut off
if i recall correctly
wide open throttle

[YarisPR]

What other parts of the car have you changed/moddoed in the past? this sounds like it might be something screwing-up one of the sensors.

Maybe it has to do with my custom intake, maybe.
My mods:
-Intake
-Underdrive Crank Pulley
-Header
-2" custom exhaust (only 1 cat deleted)
-1zz TB (its on right now, but as I mention, it has done it without the TB)
-Nothing else for now :evil:

I haven't scan it because the CEL goes off as soon as it gets back to normal.


This might be a good mystery to solve.

[ozmdd]

When you say intake, do you mean intake manifold, or just CAI?

[ozmdd]

Which cat did you delete?

[YarisPR]

Which cat did you delete?

-The one without the O2 sensor
-I mean CAI.

[PHXDEMON]

You're right, it was a simple install, but the issues that come along with this mod aren't worth the mod itself IMO (Oscillation, CEL, No smooth transition into DFCO, and one members car just shut off if remember right) The install time is short, but trying to get it to play nice withthe ECU is another thing. Don't get me wrong thoug, If i could throw this TB on and not have any issues i would have kept it on, but i had the first 3 problems that i mentioned above. So it had to come off, i think there are only a handful of memebers that have done this sucessfully

That was me. finally ran perfect with no CEL/oscillation at all and 5 minutes later at a stop light it just died and left me stranded 20 miles from home :cry:
http://i105.photobucket.com/albums/m218/PHXDEMON/img1242287749925.jpg

[tk-421]

Wow that sucks...
It's weird how inconsistent this mod is turning out to be... Some have no problems and others, well... :rolleyes:

you can rotate the inlet connections on the tb to match the angle of the 1nzfe throttle body

Oh I just ended up using a dremel... Came out perfect but took a while to get there.

[SEVEN]

Maybe it has to do with my custom intake, maybe.
My mods:
-Intake
-Underdrive Crank Pulley
-Header
-2" custom exhaust (only 1 cat deleted)
-1zz TB (its on right now, but as I mention, it has done it without the TB)
-Nothing else for now :evil:

I haven't scan it because the CEL goes off as soon as it gets back to normal.


This might be a good mystery to solve.

Check the spark-plugs, I was running on nitrous when this first happened, after that it kept happening and I didn't know what it was (although it only happened while I was using nitrous) I asked my friend, he told me to check the spark plugs, and surely, 2 of them were burned to sh*t. Hope this helped.

[YarisPR]

Check the spark-plugs, I was running on nitrous when this first happened, after that it kept happening and I didn't know what it was (although it only happened while I was using nitrous) I asked my friend, he told me to check the spark plugs, and surely, 2 of them were burned to sh*t. Hope this helped.


I did charged my spark-plugs recently and it hasn't happend again :thumbup::biggrin:

[Bluevitz-rs]

So has anyone actually tried the 1ZZ TB with a bored out intake manifold so the two fit one another?

[xbalance]

i having problem to find a 1zz TB beside 1zz TB that able to install in our 1nz manifold is there any other DBW TB we can install?