1zz Throttle body review/tips

[tk-421]

I also did this mod and recommend it for sure. I had to modify the OEM hose slightly by removing a very thin layer of rubber with a dremel. No biggie and worked like a charm and did a coolant bypass with a copper joint.

I also have a high idle for around 60 sec or so. I've had it that way for many years and I've had zero problems, FWIW.

@HANZO_187: There's a couple of very good threads about this info. Just keep in mind that some 1zz tb's work without having to swap chips (located at the base), while others apparently require it. I did it in about 10 min (maybe less) by using a drill with a very narrow bit (so that it only destroys the rivets and nothing else). HTH

[ilikerice]

Originally Posted by tk-421

I also did this mod and recommend it for sure. I had to modify the OEM hose slightly by removing a very thin layer of rubber with a dremel. No biggie and worked like a charm and did a coolant bypass with a copper joint.

I also have a high idle for around 60 min or so. I've had it that way for many years and I've had zero problems, FWIW.

@HANZO_187: There's a couple of very good threads about this info. Just keep in mind that some 1zz tb's work without having to swap chips (located at the base), while others apparently require it. I did it in about 10 min (maybe less) by using a drill with a very narrow bit (so that it only destroys the rivets and nothing else). HTH

you mean 60 seconds right?

As far as the hose go, you can use the hoses that are on the car, just swap them around. Make sure you have a pan under the car to catch the coolant when you pull the hoses off. you can use a used spark plug to plug the hose when you disconnect them from the throttle body and try to be fast. If your not fast enough, its going to get messy.. lol, but its not a big deal at all. I just zip tied them together to keep them away from the shifter cables

Now, on the stock manifold, I measured the rubber "O" ring on the mani-throttle body. I did not have to make a gasket. The 1zz throttle body fit just right where it sealed up with the throttle body. It was close, but I did not have an issue with any leaks. I used the existing O ring on the manifold.

[tk-421]

Originally Posted by ilikerice

you mean 60 seconds right?

Yes, yes I do.

[HANZO_187]

Ok cool, I'm getting the ideal process for this now. My other question now is do we know if what main years the 1zz TB come off of? I know a Toyota Matrix has it but not sure if any other cars and years.

[1.5]

Han I still have mine sitting in my trunk waiting to install. We can do them together when you get one

[1.5]

Han your local autozone/discount/whatever will carry an assortment of those couplings

[cali yaris]

^ Just go by the part number. Car model years are not a predictable way.

[ilikerice]

I got my first Auto X coming up in march and I'd like to squeeze what ever I can out before hand.

If you are doing an SCCA event, larger throttle body will throw you in FSP "F Street Prepared" I don't know all the modifications you have done, but if you list them, we can help you class your car.

[1.5]

with lowering springs i think youll be in STF but like Derrick says the TB will put you into SMF (iirc)

[HANZO_187]

Heres what got listed in the car so far.

Sprint progressive lowering springs
Cosmic Racing CAI
NST 10% Crankpulley
Rear Seats removed

Thats what I got as of now, I also got Megan Headers that I might be buying from "BUZZ" and I don't know if
Wheels play a part in this but was going to buy KONIG Flatout wheels 15x8 at 12 lbs each. Just putting it out there in case it counts and @1.5 yeah bro count me in, give me a reason to come hang and check out your car. Lol

[yariseggvvti]

How's the sounds like when you run 2.5" exhaust? Did you delete resonator and second CAT? Do you lose any lower end and getting more high end. VVTI kicks harder?

Thanks!

[Black_griffin6]

Originally Posted by yariseggvvti

How's the sounds like when you run 2.5" exhaust? Did you delete resonator and second CAT? Do you lose any lower end and getting more high end. VVTI kicks harder?

Thanks!

It sounds pretty awesome man, I'll post a couple of videos when I get the chance.
Yes, resonator and secondary cat are gone.
Below 3 grand, you would think it was a much bigger engine, above that it kinda sounds like a 240sx, really mean sounding.
I think a turbo or supercharger would really help, this is a FI exhaust on a NA car. Right now it doesn't pull as hard as I think it's capable of, it's only making about 100 whp.

[rabbito]

Originally Posted by yariseggvvti

How's the sounds like when you run 2.5" exhaust? Did you delete resonator and second CAT? Do you lose any lower end and getting more high end. VVTI kicks harder?

Thanks!

responding after 2 years later..lol...2nd cat delete do increase the flow and faster rpm gain...con is the bumble bee noise when accelerating up to 2000rpm, no more sound after 2000rpm 😣

Sent from my SM-J710F using Tapatalk

[CrankyOldMan]

Throttle body:

STF: 14.10.C The air intake system up to, but not including, the engine inlet may be
modified or replaced. The engine inlet is the throttle body, carburetor,
compressor inlet, or intake manifold, whichever comes first.

FSP: 15.10.C. Induction allowances are as follows:
1. Carburetors, fuel injection, and intake manifolds are unrestricted...

SMF: 61.1.D. Drivetrain and related components (induction, ignition, fuel systems,
etc.) are unrestricted...


Crank pulley:

STF: 14.10.H. Any accessory pulleys and belts of the same type (e.g., V-belt, serpentine)
as standard may be used. This allowance applies to accessory
pulleys only (e.g., alternator, water pump, power steering
pump, and crankshaft drive pulleys). It does not allow replacement,
modification, or substitution of pulleys, cogs, gears, or belts which
are part of cam, layshaft, or ignition drive or timing systems, etc.
Any crankshaft damper or pulley may be used. SFI-rated dampers
are recommended.


Rear seats removed:

FSP: 15.2.F. Cars may have no fewer than the standard number of seats.

SMF: 16.3.K. Rear passenger seat(s), including restraints and associated hardware
may be removed.


Looks like you're running SMF this year. =)

[cali yaris]

^ I ran SMF. It's not possible to be competitive in the Yaris in that class.

[HANZO_187]

Ok so with me having my rear seats out a I'm running SMF then?

If get headers added to the list its gonna keep me there am ai right?
I'm not gonna get the TB for now since its gonna be putting me in a class I can't even compete against.

BUT I am gonna get it just in case...lol Just having it on hand is good.

[CrankyOldMan]

I'm only competitive against the one other regular SMF car in my region--a Cobalt SS with a pulley change. Neither of us built our cars around the SMF rules, that's just where we ended up. When a national competitive SMF car shows up, it's game over. That doesn't mean I don't have an incredible amount of fun in the mean time.

[cali yaris]

^ understood -- I had a blast too, but when 30 serious SMF cars show up, it's pretty humbling.