Prius Pistons - Toyota Yaris Forums

sdyaris · 11-06-2008, 04:22 PM

I was just reading that the compression ratio for the Prius is 13:1. Would the higher compression pistons work in the Yaris (10.5:1)?

Nexus1155 · 11-06-2008, 04:27 PM

HAH! im glad someone brought this up again, I've read places that the compression is due to the fact of the pistons themselves and will fit since the blocks are of the same cast.

The main difference is that the prius pistons are domed? or of a different design. I have heard that they give off the bat a 13-15hp gain. They would be great for N/A with some tuning, but not for FI

If you have time to swap them on the weekend, go for it. They are cheap and all you would need are new head studs as these ones on this block stretch i think and cannot be reused... also cheap to do.. I doubt you would need an engine lift if you and buddy was over(I lifted an H22, back breaking but i could move it...)

If you have any questions i'll try to answer them to the best of my ability...

mikenacarato · 11-06-2008, 04:35 PM

on the yaris will it do much for compression to run a thinner head gasket? im not sure how much material is there to work with though.
but on the other hand this piston idea seems pretty awesome.

cali yaris · 11-06-2008, 04:37 PM

What is the displacement of the Pruis motor? I have one, and it looks nothing like our 1.5L

RagnaCaT · 11-06-2008, 04:38 PM

Sounds like a go but engine Temp could become an issue? Maybe an Oil cooler could be used? I like N/A performance!

mikenacarato · 11-06-2008, 04:38 PM

i think 1496 is the prius displacement

cali yaris · 11-06-2008, 04:38 PM

yeah an N/A project would be really fun. 13:1 pistons with ITBs FTW!

RagnaCaT · 11-06-2008, 04:39 PM

Quote:

Originally Posted by cali yaris

What is the displacement of the Pruis motor? I have one, and it looks nothing like our 1.5L

Yes Garm 1.5 and stay away from this you are going to blow something up!

mikenacarato · 11-06-2008, 04:40 PM

i would love itbs more than anything. i have a spare set of itbs off of my yzf600 i should start making my own project! haha

Nexus1155 · 11-06-2008, 05:01 PM

lol good luck with the drive by wire system and all with the itb's, its a pain in the ass, you would not see gains in compression with a thinner headgasket, but if you machined either the block or the head, 10thousandths of an inch you would raise it about .5 points.... I do not know if there is room to do this to begin with so...

and about heat being an issue, it can only be told by the person who does it and monitors the heat... the prius doesn't overheat? But i don't know how the atkinson system kicks in and at what variables

mikenacarato · 11-06-2008, 05:09 PM

i guess to run the itb you would have to run an engine management system and physically weld in all of your brackets and cables for the throttle cable.

can you get a tune that will let you disable or bypass the drive by wire?

Nexus1155 · 11-06-2008, 05:23 PM

ehhhhhhh, doesn't work that way lol.... Unless you get either an XB or an Echo ecu and wire it up somehow along with the throttle cable and pedal... BUT they do have drive by wire ITB's out there now.. so. yeah...

Or you could hookup a cable to the current pedal and use both, and have a new throttle body on there while the stock one is in a different locations receiving electronic signals to relay to the ecu...

mikenacarato · 11-06-2008, 05:35 PM

hmm, so there not a single place that can reflash or piggyback to the yaris ecu and allow you to remove drive by wire?

Nexus1155 · 11-06-2008, 05:39 PM

i was working on a reflash, but i have other priorities. Well i mean, you could try and toss on an echo throttle body with pedal and cable and see if it will work, some things are whacky like that but you'll probably get a CEL...

RagnaCaT · 11-06-2008, 05:50 PM

Quote:

Originally Posted by Nexus1155

and about heat being an issue, it can only be told by the person who does it and monitors the heat... the prius doesn't overheat? But i don't know how the atkinson system kicks in and at what variables

True but the engine is not constantly on cuase it's a hybrid also the atkinson cycle is very different with TDC against our design but don't know but still sounds fun! I guess!

sdyaris · 11-06-2008, 06:43 PM

Heh, i wouldn't have the nerve to try it until the car is paid off.

at3GG · 11-06-2008, 06:47 PM

itbs=?? indidual throttle bodies?

toyochris · 11-06-2008, 07:18 PM

yes itb are individual throtle bodies.

11-06-2008, 04:22 PM	#1
sdyaris Drives: 2010 Nissan Frontier Pro 4x Join Date: Aug 2007 Location: Sioux Falls Posts: 37	Prius Pistons I was just reading that the compression ratio for the Prius is 13:1. Would the higher compression pistons work in the Yaris (10.5:1)?

11-06-2008, 04:37 PM	#4
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	What is the displacement of the Pruis motor? I have one, and it looks nothing like our 1.5L __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

11-06-2008, 04:38 PM	#5
RagnaCaT HacKers WanTed! View User's Garage Drives: Yaris S HB & Yaris S SD Join Date: Aug 2007 Location: Villalba, Puerto Rico Posts: 435	Sounds like a go but engine Temp could become an issue? Maybe an Oil cooler could be used? I like N/A performance! __________________ *R-CaT* Project Yar 2ZR

11-06-2008, 04:38 PM	#7
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	yeah an N/A project would be really fun. 13:1 pistons with ITBs FTW! __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

11-06-2008, 06:43 PM	#16
sdyaris Drives: 2010 Nissan Frontier Pro 4x Join Date: Aug 2007 Location: Sioux Falls Posts: 37	pistons Heh, i wouldn't have the nerve to try it until the car is paid off.

11-06-2008, 04:27 PM	#2
Nexus1155 Bathroom + Laptop = <3 Drives: Audi Join Date: Aug 2006 Location: Dorchester Posts: 1,009	HAH! im glad someone brought this up again, I've read places that the compression is due to the fact of the pistons themselves and will fit since the blocks are of the same cast. The main difference is that the prius pistons are domed? or of a different design. I have heard that they give off the bat a 13-15hp gain. They would be great for N/A with some tuning, but not for FI If you have time to swap them on the weekend, go for it. They are cheap and all you would need are new head studs as these ones on this block stretch i think and cannot be reused... also cheap to do.. I doubt you would need an engine lift if you and buddy was over(I lifted an H22, back breaking but i could move it...) If you have any questions i'll try to answer them to the best of my ability...

11-06-2008, 04:35 PM	#3
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	on the yaris will it do much for compression to run a thinner head gasket? im not sure how much material is there to work with though. but on the other hand this piston idea seems pretty awesome.

11-06-2008, 04:40 PM	#9
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	i would love itbs more than anything. i have a spare set of itbs off of my yzf600 i should start making my own project! haha

11-06-2008, 05:01 PM	#10
Nexus1155 Bathroom + Laptop = <3 Drives: Audi Join Date: Aug 2006 Location: Dorchester Posts: 1,009	lol good luck with the drive by wire system and all with the itb's, its a pain in the ass, you would not see gains in compression with a thinner headgasket, but if you machined either the block or the head, 10thousandths of an inch you would raise it about .5 points.... I do not know if there is room to do this to begin with so... and about heat being an issue, it can only be told by the person who does it and monitors the heat... the prius doesn't overheat? But i don't know how the atkinson system kicks in and at what variables

11-06-2008, 05:09 PM	#11
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	i guess to run the itb you would have to run an engine management system and physically weld in all of your brackets and cables for the throttle cable. can you get a tune that will let you disable or bypass the drive by wire?

11-06-2008, 05:23 PM	#12
Nexus1155 Bathroom + Laptop = <3 Drives: Audi Join Date: Aug 2006 Location: Dorchester Posts: 1,009	ehhhhhhh, doesn't work that way lol.... Unless you get either an XB or an Echo ecu and wire it up somehow along with the throttle cable and pedal... BUT they do have drive by wire ITB's out there now.. so. yeah... Or you could hookup a cable to the current pedal and use both, and have a new throttle body on there while the stock one is in a different locations receiving electronic signals to relay to the ecu...

11-06-2008, 05:35 PM	#13
mikenacarato SIPNDEW View User's Garage Drives: 15 STI Join Date: Oct 2008 Location: Brentwood, TN Posts: 2,281	hmm, so there not a single place that can reflash or piggyback to the yaris ecu and allow you to remove drive by wire?

11-06-2008, 05:39 PM	#14
Nexus1155 Bathroom + Laptop = <3 Drives: Audi Join Date: Aug 2006 Location: Dorchester Posts: 1,009	i was working on a reflash, but i have other priorities. Well i mean, you could try and toss on an echo throttle body with pedal and cable and see if it will work, some things are whacky like that but you'll probably get a CEL...

11-06-2008, 06:47 PM	#17
at3GG Drives: 07 metmet LB Join Date: Oct 2008 Location: VA Beach Posts: 648	itbs=?? indidual throttle bodies? __________________ F5 CAI, MR axleback, MR Header, NST SSK. Full Exhaust wrap, AT3 Custom SSK Konig Heliums 15x6.5 Black Tanabe Df210's

11-06-2008, 07:18 PM	#18
toyochris View User's Garage Drives: Yaris LB '07 Blazing Blue Join Date: Oct 2008 Location: Puerto Rico Posts: 49	yes itb are individual throtle bodies. __________________

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