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10-23-2015, 09:04 PM
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#1 |
 
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blueprint and balancing gains?
so since the 2nd gen Yarises have started showing up at the local u-pull-it I've been floating the idea of blueprinting and balancing a stock motor and swapping it with my original engine. has anyone done this? what kind of gains might I get if I fo this and port the head? I'd like to gain another few horses if possible but would rather not get into swapping or the cost of forced induction.
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11-02-2015, 08:27 AM
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#2 |
 Drives: 2013 Yaris Hatchback L Join Date: May 2013
Location: Newark NJ
Posts: 229
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There will be a gain just from refreshing a second motor( especially if the current 1nz has high miles) not so much from balancing. If you're considering getting a second 1nz, refresh with and add some prius 13.1 pistons in it then balance it. I believe a menber here from PR mentioned his prius pistons netter him over 10whp gain on his yaris.
For 50$ brand new each, the piston swap is probably the best bang for your back internally you can do. |
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11-02-2015, 10:45 AM
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0-60 in slow
Drives: light blue liftback Join Date: Aug 2009
Location: so cal
Posts: 926
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The gains are pretty non existent, in fact the higher the mileage the more likely the engine is loose, and therefore easier to spin. If the bore is in spec, there will be no gains from replacing the rings or pistons.
You'll get more out of doing head work, like a 3 angle valve job and decking the head, then you will out of anything on the bottom end.
__________________
2014 BSpec Divisional Champion |
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11-16-2015, 10:22 PM
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#4 |
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Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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the better option would be to pull the engine/ecu from a scion xd. it bolts right in and you will gain 30hp. you can use your blueprint money for a sweet exhaust system.
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11-30-2015, 11:24 AM
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#5 |
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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What is different with the Prius pistons that causes a gain in hp? Is that just with Prius pistons or also rods?
__________________
No one ever wants to give a Yaris the point by... 
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11-30-2015, 12:17 PM
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#6 |
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Pumpman
Drives: 2019 Kia Soul EV Base Join Date: Dec 2014
Location: Langley, BC
Posts: 434
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^ The Prius pistons are forged units to allow for a higher compression ratio. 13:1 I believe, as compared to 10.5:1 for the Yaris.
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"I would rather loose by a mile in a car I built myself, then win by an inch in a car that was built for me." - Moog |
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11-30-2015, 12:46 PM
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#7 |
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Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
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would the Prius pistons automatically increase compression in the 1nz enigne or does it require other modications to increase the compression? With a 13:1 you'd need to run premium fuel but to take advantage of that would you not have to re map the Yaris ECU?
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No one ever wants to give a Yaris the point by...
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11-30-2015, 01:52 PM
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#8 |
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Data doesn't lie
Drives: That Scrappy 2zrVios Join Date: Oct 2014
Location: San Diego
Posts: 761
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You will need a tune with a piggyback ecu or standalone ems to run higher compression....Im not even sure if you can run 91octane safely
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