NCP91 RS VVTI solenoid and MAF sensor upgrade for NCP90

[Compeer]

Was reading the "all motor yaris" post and read about the different vvti solenoid valves and maf sensors. The standard 1nzfe Solenoid valve turns vvti on at 4000rpm but the RS solenoid turns it on at 2500rpm (The thread said it was confirmed by tuner on the dyno)

So being in nz I whipped out to the wreckers and took one off a 2009 90k km crashed RS. $120 nzd later and these little mods are adding up!

Rs Mark 2/3 solenoid
https://i.gyazo.com/fabf6cc00ef7147f077f60438b52f753.jpg

https://i.gyazo.com/b4a2b62257fbf577f4df9f696b69da6c.jpg

https://i.gyazo.com/f5fe9711651d680d8416ac3e59e12e7b.jpg


Turns out I already had the "C" labeled maf sensor but the new one looked cleaner so that got installed too. Car should be happy as after the ecu reset. Will test it over the next few days to see if i notice the vvti kicking in earlier.

Another day another mod! I think im kinda addicted to looking for yaris parts at this point.

[mitch9521]

Do the two solenoids have different part numbers from each other?

[remcafee]

i was never aware that the vitz rs had vvti engage at a different rpm

[Compeer]

Yes they are completly different units, the thai people do this to any 1nz-fe they hot up as a base upgrade, same with the C maf sensor and the coil packs from the RS also which are beefer apparently. Check out the hole in the end, beefer last slot and also how the oil flows around it, it has a step down to allow it. This is way different.


I could nab more if needed theres a few more RS motors around.

[remcafee]

let us know how it feels, maybe a little more torque down low?

[sh0rtlife]

something tells me it would be more low end torque...right in that "dead spot"

see if you can get us part numbers from both the maf and the vvt....im sure shipping to the states would make it cheeper "new" but i need some part numbers to verify what im hunting for

knowing toyota.....id bet that vvt unit is probably used on something else? ditto for the maf

part numbers i need part numbers!!!!!

[sh0rtlife]

trying to dig up anything i can thru toyota directly and im not finding the RS part?..ive checked 06-18 and they all show the same number ..but..funny enough toyota doesnt once list an "RS"..sport was checked as well


https://parts.toyota.com/p/Toyota_2009_Yaris-Liftback-5-Door-S-15L-AT/Engine-Variable-Valve-Timing-VVT-Solenoid/62915760/1533021011.html


so being i cant even find an "rs" on toyotas site is of no help...was going to look up the maf as well but...again..no rs listings

[NYC-SE]

Wouldn't this solenoid be controlled by the ECU? How would the ECU know that a different solenoid was installed? Wouldn't it just energize this solenoid at 4000 rpm just like the other one? What am I not understanding?

[WeeYari]

What am I not understanding?

I'm with you.


Also, as far as I know, in the Canadian and US markets, the RS or S models did not get anything different over the lower trim levels.

[Compeer]

I will get you guys the parts numbers in the morning with the light, been busy during the day and forgot to when I installed them.

Also yeah its more aggressive feeling from the moment you floor it, seems much nicer for cruising now but this could be the new axle back exhaust as well. But it does seem to be adjusting timing earlier feels more aggressive slighty.

[sh0rtlife]

Wouldn't this solenoid be controlled by the ECU? How would the ECU know that a different solenoid was installed? Wouldn't it just energize this solenoid at 4000 rpm just like the other one? What am I not understanding?

im wondering this also, but i also wonder if it gives some "feedback" to the ecu, or if the channels in it are cut differently enough to make a big change...thats why i went hunting for any referance to it i could find thru toyota

[sh0rtlife]

Wouldn't this solenoid be controlled by the ECU? How would the ECU know that a different solenoid was installed? Wouldn't it just energize this solenoid at 4000 rpm just like the other one? What am I not understanding?

im wondering this also, but i also wonder if it gives some "feedback" via resistance to the ecu, or if the channels in it are cut differently enough to make a big change...thats why i went hunting for any referance to it i could find thru toyota

i have turned this up tho

"yaris" stock US(verifyed) part numbers
1533021011
15330-21011
1533021010
1533021020

"echo" numbers
15330-23010

"euro" yaris
15330-40020

now these number were all pulled from ebay...so...i dont know how acurate any of it is...but it raises a big question...
why are there 3 different units for the same engine
a "revision" from the gen1 to gen 2 makes sense..so lets write that one off...but why is the "euro" and "US" spec parts 2 different numbers for the same year range?

i still cant verify finding a RS part number tho

[Compeer]

Got the numbers for you and its 15330-21020 for the solenoid, so appears some of your USA motors got this one. ( I just researched and USA were sold the RS yaris, which came with this solenoid, thats why you have it listed in usdm)

maf sensor number is "c" 22204-22010

No idea about this brand, but they are cheap! https://www.aliexpress.com/i/1005001388213512.html

It has ALL the RS chassis numbers listed but not the the standard chassis like ncp90. The sellers seem to sell any of the numbers as "matching" so becareful if you order to make suire it is the RS designed one.

And just looking at it, its going to have a LOT more oil flow to the vvti assembly, I just looked up that stock european one and and it only has two small slots, so way less oil flow.

Considering the vvti assembly is a known failure point for the engines I think I like the idea of more oil flow, as for performance is does feel like vvti is coming on sooner.

[sh0rtlife]

more flow would make the vvt come in sooner and in theory "tune" it more at different points

im going to have to look at the one in the yaris we have and see what the part number is..its a canadian built car but is NOT an RS...so it may be that "all" north american units had the "rs" part?

running the maf thru US toyota

2220422010
22204-22010
222040C020
222040D030

so again maybe "euro" stuff was "detuned?....kinda weird

[remcafee]

my car already has the c maf sensor, my vvti solenoid appears to be 15330-21011, so maybe all US 1.5s come with the c maf sensor, the vvti solenoid is not the large port one though

[Compeer]

Check out this on the after market "rs" one, it has a peg to turn it in the housing. The real RS one has that step down on the side so that angle would not matter and is essentially ported.

The Non rs ones have sometimes only 2 holes for the euro one. https://i.gyazo.com/ed18519d674518bbe46e4748cde9361e.png

Now this is how it works, So we are compltetly changing the oil flow to the vvti and the vvti unit is operated by oil pressure, so just looking at the viens and step down this would drastically increase the oil flow and you would think allow for great control of the timing??.https://i.gyazo.com/293a6cd6544e43b740e6b7b3e17cd357.pnghttps://i.gyazo.com/e1f7eef923fd3dc7c47d6507450cc300.png

This rs solenoid increases the oil flow too and from the VVTI cam unit allowing it to change the timing faster on the fly, thats what the step down is for, just to increase flow out of and into the unit, this design is all about increases flow rate so the VVTI can react quicker. The tuner has said the vvti was responging better and thats what it feels like, this is for sure an upgrade.

PS: don't get a cheap one, get a real one I will change the link to the correct one with step down for flow. I have looked tho only RS ones have the step down. This is genuine toyota RS only, this is why the Thai guys said only rs.

[NYC-SE]

Yep that's how the VVTI works. My original question still stands.

[Compeer]

Wouldn't this solenoid be controlled by the ECU? How would the ECU know that a different solenoid was installed? Wouldn't it just energize this solenoid at 4000 rpm just like the other one? What am I not understanding?

You will have to learn Thai and join their forums all I was going off the e85 all motor post from this forum where they have dyno tuned a 1nzfe with a few mods. https://yarisworld.com/forums/showthread.php?t=55835

But I just looked up other toyota "performance" engine variants and they have the same design for example here is the 2zz-ge's unit. It also has the step down and the extra outlet holes. https://1.bp.blogspot.com/_WnxU5DbZvnk/TBwpln9MtJI/AAAAAAAAAq0/-Kk23YMrcHc/w1200-h630-p-k-no-nu/How+to+Build+a+Lift+Controller+for+VVTLi+%282ZZ-GE%29+001.jpg

[Neinris]

That's interesting...

Found one in Amazon:

https://www.amazon.com/Variable-15330-28020-Highlander-2001-2013-ZBN/dp/B06XHD21JC/ref=asc_df_B06XHD21JC/?tag=hyprod-20&linkCode=df0&hvadid=241969781511&hvpos=&hvnetw=g&hvrand=15916819460374928800&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9051923&hvtargid=pla-571287546138&psc=1

[Compeer]

That's interesting...

Found one in Amazon:

https://www.amazon.com/Variable-15330-28020-Highlander-2001-2013-ZBN/dp/B06XHD21JC/ref=asc_df_B06XHD21JC/?tag=hyprod-20&linkCode=df0&hvadid=241969781511&hvpos=&hvnetw=g&hvrand=15916819460374928800&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9051923&hvtargid=pla-571287546138&psc=1

Notice tho it doesnt have the correct amount of holes or the stepped down parts that the real RS one has.

[Neinris]

Notice tho it doesnt have the correct amount of holes or the stepped down parts that the real RS one has.

I counted 6 on one side and 3 on the other. What's the real RS's count?

[Compeer]

I counted 6 on one side and 3 on the other. What's the real RS's count?
6 holes as well plus holes in the tip. the holes tho are a bit larger and different towards the end, plus mine had that like 0.5mm step down, but the one the e85 all motor post guy used look like that aftermarket version you posted and they said it worked mint.

ALSO got to wonder what the clocking on the side is for!???? OEM RS doesnt have that, its just set where its at.

[Leospamplona]

Can i only change to rs solenoid without changing the stock maf sensor? Will it damage the engine or have negative effects?thanks!

[Compeer]

Doesnt effect anything other than supposed to have faster vvti reaction. So plug and play on any 1nz-fe