Ok, here is my idea... Input appreciated!

[Astroman]

Ok, so I've decided my next performance mods will be to help the car breath easier. I've already done the CAI and DC Sports header, and as of right now the rest of the IHE system is stock.

My plan is to use the 1ZZ throttle body (spacer if it's a good idea, might go nitrous), remove one of the catalytic converters and go full custom exhaust after that. The shop that will be doing the exhaust bent and installed the 3" setup and intercooler piping on my Lebaron and they did a great job for around $400 so I will be going back there again. Where I live there are no inspections, but I do want to keep one of the cats, or replace it with a high flow variety (which I did on the Lebaron).

What should I be looking for? I've read the '05 Corolla TB will work but I wanna know exactly what I will need to do to make this work, along with what type of muffler I should be using. I'm wanting it to sound nice but not ricy at WOT, have a nice idle sound, but at cruising be relatively quiet. I'm also thinking a dual-tip center exit as I won't ever be reinstalling a hitch again.

So, lets see what you all have to say about this, bonus points for those who've actually done these things. Also, anyone have any idea how much extra power this might free up?

[SLIK4]

as far as muffler goes i've heard good things about magnaflows sound. going full exhaust might free up 5 hp...:iono:

[06silveryaris]

I run a thrush muffler with all factiry piping and it has a good solid sound. And no drone at highway speeds. Plus t was like $23 or something like that at advanced auto

[PETERPOOP]

i say wait for the MI turbo kit to come out...

[largeorangefont]

This will free up about 2-3 HP.

You will want to use a Thrush or turbo style muffler. A Magnaflow will drone pretty bad.

I have an Imco turbo style muffler on my car. It has been great.

[dean_park]

you could get that OBX header back that's on eBay. Another member bought it and it actually deleted the cat's... it looked nice and it's a bolt on and I think it was $225 shipped.

[The Spectacle]

This will free up about 2-3 HP.

You will want to use a Thrush or turbo style muffler. A Magnaflow will drone pretty bad.

I have an Imco turbo style muffler on my car. It has been great.

I have a Magnaflow, it doesn't drone.

[Yoda]

i have a res-back exhaust it net me 5 whp

[Astroman]

great input. I was thinking of either the turbo style or magnaflow so it was great to hear both being mentioned. I had the vitz trd axleback and it gained 2hp, so I'm hoping for at least 5+ with the upcoming setup. I would love to go turbo but as long as this is my daily it aint happenin.

Still would like to hear from the TB people. I put a 52mm on my lebaron beast and it was amazing what it did for that car.

[Astroman]

Ok throttle body on its way, now just for the custom exhaust.

[Yoda]

the Tb gave about 3 whp for me

this is my dyno chart

http://www.yarisworld.com/forums/showpost.php?p=333132&postcount=61

i have not dynoed it yet with the custom exhaust i have now. but i am pretty sure i am sitting at 118whp

[cali yaris]

^ Dyno chart says 103 whp. You think going from a TRD exhaust to a custom exhaust got you 15 whp?

meanwhile, I liked my Magnaflow and it didn't drone. Now I like my Vibrant even better.

[TheSilkySmooth]

The cam phasing gives the most power - this is whats cuting power. - the VVTi. the TB is plenty big enough stock. The It only has to be 1. 7 X the diameter of one intake runner. You would need a larger intake and head work and stiffer valve springs to get better breathing. Again the cam advance is killing power - got to find a way to really retard can timing above 4k rpm. I did this by "accident" in the winter, running M1 AFE and the bosch filter with the filtech media ( purolator style unit) This had low oil flow and retarded the cam an the car was ultra racy. All the power you would want.

[Astroman]

Just got the 1zz TB installed and so far no CEL. What amazed me is how much nicer the car sounds! Can't wait to get it out on the open road. My mechanic drove while I rode and he was pretty impressed with how responsive the car is now. :biggrin:

[ddongbap]

Wait..

*checks thread section*

Okay, you're fine. If this were general, those fuel econ boys would be all up in yo grill.

[Yoda]

^ Dyno chart says 103 whp. You think going from a TRD exhaust to a custom exhaust got you 15 whp?

meanwhile, I liked my Magnaflow and it didn't drone. Now I like my Vibrant even better.

look again... second dyno says 111.89whp. This was before the i did my custom exhaust.

But here is an idea not sure if it would work. Buy the xa S/C kit and replace your TB with one from an xa ,then you shouldn't have to worry about making an adapter. Or cheaper yet get that weapon r intake manifold i have been hearing about with the xa TB... Just a thought.

[Astroman]

Wait..

*checks thread section*

Okay, you're fine. If this were general, those fuel econ boys would be all up in yo grill.

LOL

Weird thing is, my Scangauge shows I'm getting amazing mileage right now (well, not RIGHT now. Right now the car is parked and off) in the high 30s to low 40s. Usually when I zip around town it's in the 20s :rolleyes:

Idle was rough after the first test drive, felt like it was surging, then I did throw a check engine light (which I cleared) on the 3rd drive. When I stopped one of the hoses had come undone as the new coupler is a little longer than the stock one. I dunno if my mechanic had forgot to hook it up or it came off. If it does it again I'll just trim the coupler so it fits better.

[ddongbap]

LOL

Weird thing is, my Scangauge shows I'm getting amazing mileage right now (well, not RIGHT now. Right now the car is parked and off) in the high 30s to low 40s. Usually when I zip around town it's in the 20s :rolleyes:

Idle was rough after the first test drive, felt like it was surging, then I did throw a check engine light (which I cleared) on the 3rd drive. When I stopped one of the hoses had come undone as the new coupler is a little longer than the stock one. I dunno if my mechanic had forgot to hook it up or it came off. If it does it again I'll just trim the coupler so it fits better.

I was talking about your cat removal.

[Astroman]

ah, lol.

[ddongbap]

ah, lol.

Don't worry. I believe you should take off both cats.

[Astroman]

I might, no inspections where I live.

The hose came off again, resulting in poor idle and a CEL. Going to trim the coupler tomorrow.

[suckerface]

So, am I to understand, with the Corolla 1ZZ TB, you can just toss that on in place of the 1NZ TB with no further modifications? Or is it a good idea to have a better header on there first? I'm going to a salvage yard this week or next and would like to see if I can track one down if that's the case.

[marcus]

im curious what happen next on astros tb..

[PETERPOOP]

So, am I to understand, with the Corolla 1ZZ TB, you can just toss that on in place of the 1NZ TB with no further modifications? Or is it a good idea to have a better header on there first? I'm going to a salvage yard this week or next and would like to see if I can track one down if that's the case.

some people have problems with it, so they end up doing the chip swap from the 1nz to the 1zz TB. Even then (like my experience), some people still have problems. Could be a bad TB, since most are bought used from ebay.

[Astroman]

From what I've read here, it seems to be the TB with the US part no., the japanese part seems to work better.

On a interesting note, my '05 corolla TB I purchased from Functionspec had a odd part number (#22030-0D030). There was a thread on here on how to do it but the OP deleted his posts. http://www.yarisworld.com/forums/showthread.php?t=14672

So far the only time the car runs like crap at low RPM and throws a CEL seems to be when one of the hoses that hooks up to my intake falls off because the new coupler is almost an inch longer than the stock one. I'm going to trim it down today which should get rid of the problem. If I can find my digital camera I'll take a movie of just how it sounds, as it changed a LOT. Sounds really really good now, and I'm still stock after the header.

I haven't done the chip swap or adjusted the idle, will give it some time as the TB was only installed yesterday.

[TheSilkySmooth]

I love to see a dyno sheet from a YW member that shows any improvement with a larger TB on this car with stock cams, inlet manifold and head. Laws of physics say NO improvement is to be had. And I mean back to back, same temps and fuel. Some days my car makes what feels like 10 more hp than other days - usually due to barometric pressure and temps, so you will alway have that variability in the mix. AGAin the power is ALL TO BE HAD in the cam phasing (vvti) with stock cams, ONCE YOU UNCORK THE EXHAUST AND HAVE A GOOD cai. yES i AM A DOUBTER.

[PETERPOOP]

supossedly Yoda? has a dyno that shows 3whp improvement, i think. however, that dyno was probably done on a different day with different weather conditions. so who really knows? hehe

edit: post #11 of this thread..

[Yoda]

my run was not on the same day. i am going catless next week so i will put that dyno up. hoping for 120whp

[Yoda]

scrap that. just took a ride in a honda fit with a straight pipe from the header back.. it smells and sounds really bad. just gonna put that money towards something else.

[Bluevitz-rs]

I've unplugged the VVT-i solenoid before just to see how the car went. It was night and day. WAY more consistent power and probably a few more up top.

(Unplugging the VVT-i solenoid retards the intake cam to 0° all the time)

[PETERPOOP]

scrap that. just took a ride in a honda fit with a straight pipe from the header back.. it smells and sounds really bad. just gonna put that money towards something else.

lol. you don't like that smell? I LOVE that smell. You weren't even going to run a resonator?

Why don't you do what barber did?

[ddongbap]

I love to see a dyno sheet from a YW member that shows any improvement with a larger TB on this car with stock cams, inlet manifold and head. Laws of physics say NO improvement is to be had. And I mean back to back, same temps and fuel. Some days my car makes what feels like 10 more hp than other days - usually due to barometric pressure and temps, so you will alway have that variability in the mix. AGAin the power is ALL TO BE HAD in the cam phasing (vvti) with stock cams, ONCE YOU UNCORK THE EXHAUST AND HAVE A GOOD cai. yES i AM A DOUBTER.Dyno graphs don't show throttle response bro.

[Astroman]

150 miles and the car purrs, no CEL. It's amazing what a difference this has made in how well the car pulls now when accelerating, I'm not having to push the pedal down as much to go uphill, and passing is much quicker. REALLY can't wait to get the custom exhaust done. I've done a TB swap before, this one really shines. Even my mechanic is impressed with how well the car responds and accelerates now. Do this mod, it's well worth it!

[PETERPOOP]

Yes, if you can get it to work.

[sito]

150 miles and the car purrs, no CEL. It's amazing what a difference this has made in how well the car pulls now when accelerating, I'm not having to push the pedal down as much to go uphill, and passing is much quicker. REALLY can't wait to get the custom exhaust done. I've done a TB swap before, this one really shines. Even my mechanic is impressed with how well the car responds and accelerates now. Do this mod, it's well worth it!


Astroman, did you swap the chip?

[Yoda]

lol. you don't like that smell? I LOVE that smell. You weren't even going to run a resonator?

Why don't you do what barber did?

nope was going to be straight thru. right now i have from the res back.

[Astroman]

Astroman, did you swap the chip?

No chip swap, but again this one did have a part number that I've only seen on this TB (#22030-0D030). Yesterday it felt like the ECU finally learned the new TB. Idle is just about normal, and even the warm up idle isn't as high as before, and it settles down quicker. Didn't even adjust the idle screw.

So maybe the secret is the part number? Either way my stock one isn't going back on in the foreseeable future.

[sito]

No chip swap, but again this one did have a part number that I've only seen on this TB (#22030-0D030). Yesterday it felt like the ECU finally learned the new TB. Idle is just about normal, and even the warm up idle isn't as high as before, and it settles down quicker. Didn't even adjust the idle screw.

So maybe the secret is the part number? Either way my stock one isn't going back on in the foreseeable future.

Thanks Astroman...:smile:

Any pictures of the throttle body on your engine bay? :biggrin:

[suckerface]

Great feedback Astroman. I'm heading to a salvage yard this evening to see what new toys I can find :)

[thebarber]

im not sure the throttle body actually nets whp or just better throttle repsonse. the throttle plate is about 25% bigger, so essentially when you're at half throttle its letting in the same air as the stock throttle body lets in at about 63% throttle.

the inlet to the intake manifold is pretty tight to the 1.75" stock throttle body.

i also have to say that im pretty happy with my resonator-back exhaust at the moment. id worry that without a supercharger or turbo, any bigger than 2" you'd lose a lot of bottom-end power (actually i feel like i lost some grunt with the addition of the dc header last month)

[Astroman]

Stock TB is 2", 1ZZ TB is 2.5". NO loss of bottom end, more power is going to the wheels as the motor runs like a raped ape now.

Will deffinetly be getting a dyno done this summer when the custom header-back exhaust is done. :biggrin:

I will take some pics today if I can, video too

[darkmoon87]

Stock TB is 2", 1ZZ TB is 2.5". NO loss of bottom end, more power is going to the wheels as the motor runs like a raped ape now.

Will deffinetly be getting a dyno done this summer when the custom header-back exhaust is done. :biggrin:

I will take some pics today if I can, video too

nice. looking forward to see the video from u

[thebarber]

stock yaris TB is 1.75" isnt it?

[PETERPOOP]

Stock TB is 2", 1ZZ TB is 2.5". NO loss of bottom end, more power is going to the wheels as the motor runs like a raped ape now.

Will deffinetly be getting a dyno done this summer when the custom header-back exhaust is done. :biggrin:

I will take some pics today if I can, video too

I wouldn't waste your money on a headerback exhaust if your only mods are 1zz TB/I/H/E etc. I'd say do it if you were boosted.

[FunctionSpec]

Astroman,

Good to hear that everything is working out great :thumbsup:

[advocate]

i say wait for the MI turbo kit to come out...

This.


You're going to pay 800$ for 3 horsepower.

Bolt on mods are shit and the yaris ECU is shit.

Tuned FI or nothing.

[sito]

Stock TB is 2", 1ZZ TB is 2.5". NO loss of bottom end, more power is going to the wheels as the motor runs like a raped ape now.

Will deffinetly be getting a dyno done this summer when the custom header-back exhaust is done. :biggrin:

I will take some pics today if I can, video too

Hi Astroman,
Is the 1zzfe throttle body a direct fit to the stock intake manifold?
Any modifications to it?

Thanks.... :biggrin:

[Astroman]

My bolt-on mods so far have reduced my 1/4 mile time by 2 sec so they aren't shit. I'm not going turbo as I know the reliability of such a setup, and I simply cannot take the risk with my daily driver I still owe almost $8k on. (See my fine chrysler engineering thread posted a few years ago, my Lebaron would have ate garm's yaris for lunch at the 1/4 mile, but I enjoy driving the yaris more). These mods aren't worthless on N/A, they do help, and the TB has helped even more. There is something to gain with what I've planned, and eventually a supercharger will be on there so this won't all be for "nothing". I drive a lot, and with my suspension and engine modifications I've greatly increased the fun factor. To put it simply the TB mod worked great, and netting very real gains which weren't just noticed by myself. My car isn't done, more mods are comming. :smile:

[Astroman]

Hi Astroman,
Is the 1zzfe throttle body a direct fit to the stock intake manifold?
Any modifications to it?

Thanks.... :biggrin:

It's a direct fit, I didn't need to modify anything. If the car runs like crap and throws a CEL then you'd need to swap the chip on the TB. I was lucky, it bolted on and worked.

[sito]

It's a direct fit, I didn't need to modify anything. If the car runs like crap and throws a CEL then you'd need to swap the chip on the TB. I was lucky, it bolted on and worked.

Cool.... :biggrin:

Thanks bro.....

[thebarber]

It's a direct fit, I didn't need to modify anything. If the car runs like crap and throws a CEL then you'd need to swap the chip on the TB. I was lucky, it bolted on and worked.

normally you need to turn one of the coolant lines around to reach the OEM 1nzfe lines

i assume you bought yours used from a member?

[Astroman]

I did buy mine from a member, fuctionspec. I don't know if he moved the coolant line or not. I know he didn't adjust the idle or swap the chip.

[PETERPOOP]

Well if a supercharger is in the future, then I take back my comment about not getting a headerback exhaust. However, I wouldn't get it until after you have the S/C on or sometime soon before you put the S/C on. You wouldn't want to be driving around with 2.25" headerback exhaust and not have the S/C on. You will have no torque AT ALL! hehe

[ddongbap]

This.


You're going to pay 800$ for 3 horsepower.

Bolt on mods are shit and the yaris ECU is shit.

Tuned FI or nothing.

+1. Or engine swap.

[ddongbap]

Well if a supercharger is in the future, then I take back my comment about not getting a headerback exhaust. However, I wouldn't get it until after you have the S/C on or sometime soon before you put the S/C on. You wouldn't want to be driving around with 2.25" headerback exhaust and not have the S/C on. You will have no torque AT ALL! heheWell, that'll only be true on the low end. When top end kicks in, then it'll be better.

[PETERPOOP]

Yes, but it is no fun at all. Trust me. Before I had my blitz wired to be "ON" all the time, I would sometimes drive with the compressor off. That thing had no torque and was somewhat embarrasing to drive. You would have to give it more gas to get it moving and then that would make your muffler louder, yet you weren't moving anywhere. hehe

[Yoda]

hope this helps. it was 98* outside when i did this. The blue line is from yesterday. the yellow is from January (88* then)and before i had the res-back.
You would think i would have gained power but seems i have lost quite a bit. not sure whats the cause. Was at least expecting to gain a few from the res-back. Something is off somewhere.
I just changed my oil right before i went on the dyno tho so that maybe it but idk. I use to use valvoline synthetic, but switched to mobile 1 full synthetic. And also switch my octane to 87 rather than the 93 i use.

Mod List
AFE Intake
NST Crank Pulley
DC Header
TRD Axle back Exhaust With mandrel bent to resonator
1ZZ TB

I am running a bit lean. There is more power to be had if i got a tune but probably not worth it. Hope this helps paint a picture of what to expect.
Any questions hit me up....

[PETERPOOP]

hard to compare it when those are done so far apart and different weather conditions. i know you couldn't, but it would have been ideal to been able to do those back to back ( if you could install a resback exhaust with the snap of the finger ).

[Yoda]

true but it still should have gained something rather than losing ~2whp

[sito]

Hi guys,

I just swapped the 1zzfe throttle body without the changing the chip and adjusting the idle screw...

No CEL for my car yet.. and the response is great.... :thumbup:

But when i start my car this morning, the rpm shoots up to 2500 and after 2 mins, returns to 800... And when i turn on the aircon, the rpm shoots up to 1800 when the fan kicks in, and drops to 1000 when the fan stopped. These symptoms happen when my car is in stationary mode (or gear engages in P mode). Other than that, when i was driving in the city or highway, no other abnormalities found.

I was wondering is there anyone who do the mod faces the same problem as me? I'm not sure whether my pivot 3 drive (throttle controller) causes this? Cos my current pivot 3 drive is using harness for 1nzfe, but after the tb swap, i'm not too sure do i need to change the harness.

Hope you guys can help.
Thanks!!! :smile:

[Bluevitz-rs]

Hi guys,

I just swapped the 1zzfe throttle body without the changing the chip and adjusting the idle screw...

No CEL for my car yet.. and the response is great.... :thumbup:

But when i start my car this morning, the rpm shoots up to 2500 and after 2 mins, returns to 800... And when i turn on the aircon, the rpm shoots up to 1800 when the fan kicks in, and drops to 1000 when the fan stopped. These symptoms happen when my car is in stationary mode (or gear engages in P mode). Other than that, when i was driving in the city or highway, no other abnormalities found.

I was wondering is there anyone who do the mod faces the same problem as me? I'm not sure whether my pivot 3 drive (throttle controller) causes this? Cos my current pivot 3 drive is using harness for 1nzfe, but after the tb swap, i'm not too sure do i need to change the harness.

Hope you guys can help.
Thanks!!! :smile:

It's simply because the throttle body is designed to work with a bigger motor. When the ECU tells it to open to start the car, or that the A/C has turned on, it moves the throttle the same amount as the 1NZ tb, but because the opening is bigger, it lets more air in causing the higher idle.

[sito]

It's simply because the throttle body is designed to work with a bigger motor. When the ECU tells it to open to start the car, or that the A/C has turned on, it moves the throttle the same amount as the 1NZ tb, but because the opening is bigger, it lets more air in causing the higher idle.

Thanks bro.... :smile:

Do i need to swap the chip or adjust the idle screw, even though i have no CEL?

Sorry to bother you guys again... what's the reason for the chip swapping?

Thanks everyone....:smile:

[Astroman]

So far over 3k miles on the TB swap and no problems. Weathers been getting colder so will see how that goes.