prius piston swap

[Nanoss22]

Sorry for the delay... just done it today and it works perfectly no mods requiered now some good breaking and dyno cooming soon...

[Golddeenoh]

how much driving have you done and can you feel a difference?

[Viperoni]

Is any tuning required, and is 91 octane gas required?

Can't wait to see the numbers! :)

[malibuguy]

finally someone is straight up doing it!

[Nanoss22]

No modification needed just 91 gas from now foward i have a apex safc for the air fuel ratio and yes i can tell it feel diferent

[1.5]

how much of a difference? Any dynos? Why 91 required?

[Flipper_1938]

how much of a difference? Any dynos? Why 91 required?

Because his compression ratio is now close to 13:1 !!!

I too am anxious to see how it does. Are you going to run the stock camshafts?

[blacksandiegovitz]

Killer ! Did you use the yaris rods or the prius ones ? Also what apexi safc are you using , afc2 or the neo ?

[Nanoss22]

The safc2 i just install the pistons yesterday now i am in breaking mode... I use the 1nz fe rods all internals are original i have some mods like 1zz trhtle ebay intake with velocity costum echo header 2" catless ending with magnaflow freeflow 2 1/4 exhaust the last time i did the dyno pull without fixing the afr 111whp if you guys are excited i am crazy to tune it to see the gains... the thing is that i have a lot of mods to get done to get the max hp so they are cooming soon

[fast2882]

Hi Guys, i am from Jakarta Indonesia, and really interested with this thread. Wow... finally, 1nz-fxe piston in 1nz-fe engine. Are you sure it is save for the clearance between the piston and valves?

[Nanoss22]

1 week and no problems it feel great i am jus giving some miles for the breaking they fit perfectly...

[BEEF]

so you were getting 111hp before the pistons? that is awesome. I would love to see what just the pistons did. I understand that dyno runs cost so most of the time it isn't cost effective to do multiple dyno runs inbetween mods.

I can't wait to see what you get out of this thing.

[fast2882]

so, really don't have any problem with the clearance between valve and pistons? wow.... do you know what your car compression ratio ? 13:1?

[fast2882]

Here in Indonesia, tuner have tested on Yaris that the head can be milled for maximum 1mm and the compression ratio become around 11.5:1. If this piston swap is successful, than this can become the highest compression ratio for 1nz-fe gasoline engine. Please dyno run to see the gain?

[Nanoss22]

In puerto rico i have some friends with yaris hb with the prius pistons swap i am waiting for them forthe dynoo numbers.. They have other mods that i would like to do if i see the gains with those mods.. the max hp that i got with mi car was 114 with the apex tuneup the last time the heat in the dyno afected the numbers 108 in that run my old apex vafc at 5000rpm it wasnt setting up and the airfuel ratio was going down to 12 very rich at fuel now with the apex safc i am expecting new numbers and no problem with the airfuelratio... Btw in this mods the head canot be touch so the valve and piston clearence well you can see it in the pics

[fast2882]

My Yaris head is still factory std, so i can do the piston swap too, but i'm still really curious for your compression ratio, is it really 13:1 and still don't have detonation problem using 91 pump gas?

[fast2882]

Wow... 13:1 street 1Nz-Fe, cast piston, the compression ratio is similar to mazda sky active newest technology

[Flipper_1938]

My Yaris head is still factory std, so i can do the piston swap too, but i'm still really curious for your compression ratio, is it really 13:1 and still don't have detonation problem using 91 pump gas?

Everything I have seen lists the 1NZ FXE engine at 13:1 compression ratio!

[fase4]

I'm seeing those piston on that 1nz-fe and I'm drooling. I want to see a dyno sheet

[Nanoss22]

Stock piston 195 to 205 compression prius 245 to 260 compress

[Bluevitz-rs]

That's a huge jump

[Viperoni]

That is pretty high too... pumped to see the dyno results!!

[fast2882]

what is this mean?

[fast2882]

Stock piston 195 to 205 compression prius 245 to 260 compress ?

[Viperoni]

Stock piston 195 to 205 compression prius 245 to 260 compress ?

Stock engine compression (with 10.5:1 compression ratio) is apparently 195-205psi
With the 1NZ-FXE (with 13:1 compression ratio) engine compression is appanrelty 245-260psi

[Nanoss22]

Did the compresion test 240 only one 238 nice numbers everithing running great...

[fast2882]

prius engine compression 245-260Psi, Nanoss22 compression 240, so it means the compression ratio is about 12:1 to 12.5:1? wow, if the car use VP racing fuel, i think the power and torque gain will be great. Can't wait for the dyno result.....

[BEEF]

I wonder what kind of power just the pistons will make and then if you actually tuned for it (maybe with the aem fic).

[fast2882]

if he use high octane number for fuel like VP racing, increasing the compression from 10.5 to 12, with proper tuning for the ecu, he should have about 10 to 15 extra HP on crank.

[ljming99]

if he use high octane number for fuel like VP racing, increasing the compression from 10.5 to 12, with proper tuning for the ecu, he should have about 10 to 15 extra HP on crank.

The rough baseline for compression is approx 5hp for every 0.5 increase, so from 10.5 to 12.

I would also give the same answer 10 ~ 15 hp as well =)

[Autocross72]

Any Dyno numbers yet?

[Bluevitz-rs]

this thread was doing so well.... then splat

[BEEF]

I too was hoping for a big nasty dyno graph. something to coax me into doing something foolish with my money.

[ilikerice]

ehh.. its only been a couple weeks since his last post. Probably either blew his engine and embarassed to talk about it or just simply got busy with something else and doesn't wanna waste time with us =(

patience

[1.5]

Or enjoying all of that powaaaa lol ^

[Nanoss22]

Sorry i was specting to have the numbers to and for the moment i dont have the time to go and do the dynopull the work family and the college got me crazy and yes the engine is running good no problems for the moment the car feel very diferent when i step on it so dont worry i will gave u the numbers and some videos of the dynopull... So be pacient

[thebarber]

ehh.. its only been a couple weeks since his last post. Probably either blew his engine and embarassed to talk about it or just simply got busy with something else and doesn't wanna waste time with us =(

patience

or he has a life outside of internet forums...

[Bluevitz-rs]

or he has a life outside of internet forums...

Psh, :cool:

[DeathBeard]

too bad you can't take full advantage of the compression with bigger cams

[taman86]

So any update to this? Still running? Dyno? Also I was wondering what engine managment you are using to run these. Stock, piggyback, or standalone? Where did you souce these from, new or another engine.

[ilikerice]

we are all still waiting for some kinda update on this one..

[taman86]

does anyone have this guys number and give him a call. I WANT UPDATES!!!

[moh]

+1

[Autocross72]

I'm guessing he blew up the engine. That is way too much compression to be running on pump gas and cast pistons. To run as much compression as he had you would need forged pistons and run race gas. Mother wise you would not be able to control detonation. Of course, he could prove me wrong by posting an up date, but physics predicts that he won't be doing that.

[jetblast]

Don't forget the toothpick con rods.

[Viperoni]

I'm guessing he blew up the engine. That is way too much compression to be running on pump gas and cast pistons. To run as much compression as he had you would need forged pistons and run race gas. Mother wise you would not be able to control detonation. Of course, he could prove me wrong by posting an up date, but physics predicts that he won't be doing that.

You sure that the motor would gain that much power from a 1.5 point compression ratio bump that the cast pistons and stock rods would crack and pop?

Worst case you need 94 octane.

[ilikerice]

@Viperoni
I dont think its the "power" that he is referring to that will blow up the motor, but the compression itself and not using correct precautions. We will never know because OP hasnt updated

[fast2882]

Hello there, any update ? dyno result maybe?

[Golddeenoh]

what would go first the cylinder walls or the connecting rods?

[fast2882]

maybe piston hit the valve

[Golddeenoh]

i was referring to should it function what would stress out first. valve clearance would be the first issue maybe a shim gasket to gain clearance and lower compression ratio while also adding block guards might work great.

[fast2882]

too bad the project isn't work, i still really curious about the result if someone can swap this piston and have about 12:1 compression ratio in 1nz-fe engine. toyota 1NR-fe engine series have 11.5:1 compression ratio, so i think actually it is possible to have 12:1 too.

[BEEF]

I think 12:1 is possible and even 12.5:1 with premium gas. the prius pistons are 13:1 so it is pushing it.

MicroImage has higher compression pistons for sale but i don't know of anyone that has done it. his 9:1 pistons are very popular in the boosted community.

[jetblast]

With that we'd be hangin' out in the FRS compression ratio arena.

[Viperoni]

With that we'd be hangin' out in the FRS compression ratio arena.

Or pretty much any other direct injection gas motors...
13:1 is nothing unusual if you have cams though.

[JustDidIt]

what would go first the cylinder walls or the connecting rods?

maybe piston hit the valve

Doubt either...

maybe piston hit the valve

Possible.. Would def want to clay before starting the car.

A lot of this is repeat from other threads..but seems very feasible:

The (static) CR would be 13:1 if you use Prius (FXE) pistons.
The dynamic CR is apparently 11:1 if you use FXE pistons
The most I may need to change when running 11:1 compression is 91 instead of 87 pump gas, besides some EM. But even then....I run on 87 now...at the supposed static CR of 13:1 or dynamic 11:1.

List of Different Parts:
Crankshaft:
1NZ-FE: 13401-21020
1NZ-FXE: 13401-21040

Cam 1:
1NZ-FE:13502-21031
1NZ-FXE: 13502-21021

Cam 2:
1NZ-FE:13501-21030
1NZ-FXE: 13501-21060

Cam Gear:
1NZ-FE: 13050-21041
1NZ-FXE: 13050-21051)

Rings:
1NZ-FE: 13011-21041
1NZ-FXE: 13011-21100

Pistons:
1NZ-FE: 13101-21070
1NZ-FXE: 13101-21110

Valve Springs:
1NZ-FE: 90905-01049
1NZ-FXE: 90501-23135

List of parts that ARE the same...
Sprocket:
1NZ-FE: 13050-21041
1NZ-FXE: 13050-21041

Timing Chain:
1NZ-FE: 13506-21050
1NZ-FXE: 13506-21050

Rods:
1NZ-FE: 13201-29735
1NZ-FXE: 13201-29735

Bearings: all three SAME
13041-21022-01
13041-21022-02
13041-21022-03

Cylinder Head:
1NZ-FE: 11101-21062
1NZ-FXE: 11101-21062

Engine Block:
1NZ-FE: 11401-29856
1NZ-FXE: 11401-29856

Valves Seals:
1NZ-FE: 90913-02092
1NZ-FXE: 90913-02092

Intake Valves:
1NZ-FE: 13711-21010
1NZ-FXE: 13711-21010

Exhaust Valves:
1NZ-FE: 13715-21010
1NZ-FXE: 13715-21010

[Bluevitz-rs]

I can only assume the differences in the crankshaft are due to the differences in the weight of the pistons and the operating speed of the 1NZ-FXE vs. the 1NZ-FE. But all the other differences make sense.

[Flipper_1938]

I can only assume the differences in the crankshaft are due to the differences in the weight of the pistons and the operating speed of the 1NZ-FXE vs. the 1NZ-FE. But all the other differences make sense.

I bet it has to do with how the generator attaches to the crank (where the flywheel would normally sit).
http://upload.wikimedia.org/wikipedia/commons/8/8f/Hsd-schnitt.jpg

[Bluevitz-rs]

Yeah, that makes more sense.

[JustDidIt]

I bet it has to do with how the generator attaches to the crank (where the flywheel would normally sit).

Good point...

[cali yaris]

I wonder how much a crankshaft would cost so I could compare them. I have a 1NZ-FE one sitting here.

[fast2882]

so, what should i do then in order to swap the 1nz-fxe piston into my 1nz-fe?

[fast2882]

what i know is : 1nz-fxe has a greater effective expansion than compression—making it simulated Atkinson cycle, rather than the conventional Otto cycle. That difference makes the cam timing and lift different ( i think ). So, if we use 1nz-fe cam, which mean the ignition timing is more advance than the 1nz-fxe cam, do they still have a clearance between top of the piston and the valve?

[JustDidIt]

what i know is : 1nz-fxe has a greater effective expansion than compression—making it simulated Atkinson cycle, rather than the conventional Otto cycle. That difference makes the cam timing and lift different ( i think ). So, if we use 1nz-fe cam, which mean the ignition timing is more advance than the 1nz-fxe cam, do they still have a clearance between top of the piston and the valve?

THAT is still one of the bigger questions... prob best to clay the piston and find out b4 firing it up. Try it at your own risk...

....but I'm sure it would be fine....

[nanoss]

For those who think that i blewup the engine guess what it running good no problem just got the valve stems replaced to stop oil consume.... since august the engine has run like oem no problems like i said there no modification needed only swap your pistons for the prius one and u are set... i dont have the time to go to the dyno yet but i think the gains are 8whp only the piston the compression is 253 253 260 250 u are thinking that mod for only 8whp well i am trying to find better camshaft with more valve opening duration in order to gain the max hp with the compression.... some people said. To me that the scion xb exhaust cams haver more duration than all the 1nz fe engines

[nanoss]

The moods in my car are thes 2 1/4 magnaflow freflow 2" catless exhaust pipe thinking of making 2 1/4 downpipe.... echo semi header, ebay cai, 3" velocity apex neo afc and prius pistons....

[thebarber]

8whp not too bad considering its just a compression bump. That IS about 8% gain (though I do realize you're guessing)

[JustDidIt]

For those who think that i blewup the engine guess what it running good no problem just got the valve stems replaced to stop oil consume.... since august the engine has run like oem no problems like i said there no modification needed only swap your pistons for the prius one and u are set... i dont have the time to go to the dyno yet but i think the gains are 8whp only the piston the compression is 253 253 260 250 u are thinking that mod for only 8whp well i am trying to find better camshaft with more valve opening duration in order to gain the max hp with the compression.... some people said. To me that the scion xb exhaust cams haver more duration than all the 1nz fe engines. The moods in my car are thes 2 1/4 magnaflow freflow 2" catless exhaust pipe thinking of making 2 1/4 downpipe.... echo semi header, ebay cai, 3" velocity apex neo afc and prius pistons....

Good to hear back from you! Thanks for the follow up.

[Flipper_1938]

For those who think that i blewup the engine guess what it running good no problem just got the valve stems replaced to stop oil consume.... since august the engine has run like oem no problems like i said there no modification needed only swap your pistons for the prius one and u are set... i dont have the time to go to the dyno yet but i think the gains are 8whp only the piston the compression is 253 253 260 250 u are thinking that mod for only 8whp well i am trying to find better camshaft with more valve opening duration in order to gain the max hp with the compression.... some people said. To me that the scion xb exhaust cams haver more duration than all the 1nz fe engines

When VVT kicks in, what does it actually change? Does it do anything for lift or duration? or does it just advance/retard the camshafts?

Would causing the solenoid to fire sooner make the motor think it had more cam?

[JustDidIt]

i am trying to find better camshaft with more valve opening duration in order to gain the max hp with the compression.... some people said. To me that the scion xb exhaust cams haver more duration than all the 1nz fe engines

Yes, if you don't mind, tell us more about this idea.

[fast2882]

why don't you try to use higher octane or racing fuel like VP racing, and have your ignition timing and Air fuel ratio retune by piggyback ECU first? i think with this two modification, you'll gain some additional HP and torque

[fast2882]

for racing camshaft, Jun auto already release a higher lift and timing camshaft, in indonesia, we use these cam when we race.

[cali yaris]

^ At $800 each (x2 !), they are pricey. Easier and cheaper to regrind camshafts here. We're doing a set for a customer now.

[JustDidIt]

^ At $800 each (x2 !), they are pricey. Easier and cheaper to regrind camshafts here. We're doing a set for a customer now.

REALLY? You guys do regrinds? Didn't see that service available online. If we were looking at the JUN cam profile, Duration (mm): 66 (264) Lift (mm): 9.5 (race profile) OR Duration (mm): 63 (252) Lift (mm): 9.0 (street profile), what could something like this run? Rough estimate?

for racing camshaft, Jun auto already release a higher lift and timing camshaft, in indonesia, we use these cam when we race.

+$1000 for cams seems REALLYdiculous for our lil 1.5...

[Jason@SportsCar]

^ At $800 each (x2 !), they are pricey. Easier and cheaper to regrind camshafts here. We're doing a set for a customer now.

$800 x 2? I paid 84,200 Yen for the 9.5 cam set and 14,000 Yen for air shipping, at that time the total was $1077.23 to my door. With the current exchange rate (assuming the price is still the same) $984.95.

Now the hidden cost is that you may need to relieve the head to fit the 9.5mm cams, the taller lobes can hit the head casting. :wink:

We have used a regrind before, works fine, and other than shimming the lifters you don't need to touch the head. :thumbsup:

[cali yaris]

^ That's right the price did come down. I still say it's pricey compared to sending off a couple of cores for grinding, especially if the head doesn't need corresponding work.

[Golddeenoh]

What about just getting MI to make a Head with +1 mm valves, a set of custom ground cams, and a port and polish? then it should be as simple as making sure the cams are clocked right, the head is torqued down to spec and the timing marks line up, then go go go.

^ just saying, if we ask enough they eventually will have to supply to the demand.

[JustDidIt]

What about just getting MI to make a Head with +1 mm valves, a set of custom ground cams, and a port and polish? then it should be as simple as making sure the cams are clocked right, the head is torqued down to spec and the timing marks line up, then go go go.

^ just saying, if we ask enough they eventually will have to supply to the demand.

^ That!!

[nanoss]

Ok a friend was telling me that the scion xb 1st gen the exhaust camshaft have more duration the same valve lift but longer the time to close the valve. I am interested in jun cams but the thing that is keep me worried is the lift since the piston are a lill bit higher the valve could hit the pistons...

[Viperoni]

Thanks for posting again Nanoss!

Does anyone have specs on the cams?
I did a quick search and couldn't find a FSM.

[nanoss]

Yeah that will be usefull to know...

[salmanghiyas]

Yeah that will be usefull to know...

Thread dead ?

[japle]

any updates?

[JimKellyfan]

Lotta work for very little HP. Me, I am shootin fer handling first, then play with braking. But, even the Blitz sounds better, and that too is a lotta dough for a little go

[YarisPR]

I've been running the Prius pistons for a while now, cero problems ��
Next step is getting a emanage and tune it with something other than 93 octane for Track Days only ��

[Flipper_1938]

I've been running the Prius pistons for a while now, cero problems ��
Next step is getting a emanage and tune it with something other than 93 octane for Track Days only ��

In your opinion, how much hp did you gain with the piston swap?

[YarisPR]

In your opinion, how much hp did you gain with the piston swap?

Prius Pistons + port & polish head where 18whp, and its a fact not an opinion cause the car was dynoed before an after (Y)

[RagnaCaT]

YarisPR who did your port and polish?

[monchito18]

Angelo still lives lol

[RagnaCaT]

Lets meet up in Puerto Rico... lets do that soon...

[tankm249]

I know the post is old but I would like to know the prius piston part number. Some stupid online sellers think the 1nzfe pistons and 1nzfxe pistons are the same. There are a lot of racers doing this mod in PR. But I wanna make sure I purchase the right piston. I don't wanna end up with the same piston I have. Please help.

[Rigaud]

I know the post is old but I would like to know the prius piston part number. Some stupid online sellers think the 1nzfe pistons and 1nzfxe pistons are the same. There are a lot of racers doing this mod in PR. But I wanna make sure I purchase the right piston. I don't wanna end up with the same piston I have. Please help.
Go on RockAsuto, you'll find the right part. \Their usually around $65 USD each.Also, might not be in stock at Rock Auto. Maybe some else here will suggest another place that has them stock

Go back a few pages and read..........part numbers are posted.

[tankm249]

Thanks
:thumbup:

[tmontague]

Can these pistons be run safely without an engine management on 94octane gas?

Obviously you wouldn't maximize the potential unless you had at least a piggyback ecu but i'm curious if the stock ecu can handle the increased compression if you run the appropriate octane gas?

[xnamerxx]

Don't waste your time if you're running stock cams, the static compression ratio is so high that you'll be fighting detonation at low rpms. For these cams to really work you'll need some pretty aggressive cams.

[thebarber]

hmmm

[YarisPR]

I'am rnning the prius pistons, with 93oct and greddy emanage ultimate

[JustDidIt]

I'm already running 1NZFXE pistons on 93oct ... [emoji23] but haven't updated my cams to 1NZFE yet. [emoji30]

[Rigaud]

Don't waste your time if you're running stock cams, the static compression ratio is so high that you'll be fighting detonation at low rpms. For these cams to really work you'll need some pretty aggressive cams.
:laugh:

[Yarisblu]

Do you know if those pistons would work on a 2nz-fe?

Thankss