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Old 07-18-2012, 10:52 PM   #1
Nanoss22
 
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prius piston swap

Sorry for the delay... just done it today and it works perfectly no mods requiered now some good breaking and dyno cooming soon...
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Old 07-18-2012, 10:58 PM   #2
Golddeenoh
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how much driving have you done and can you feel a difference?
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Old 07-19-2012, 12:08 AM   #3
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Is any tuning required, and is 91 octane gas required?

Can't wait to see the numbers! :)
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Old 07-19-2012, 12:56 PM   #4
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finally someone is straight up doing it!
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Old 07-19-2012, 05:24 PM   #5
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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
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Old 07-19-2012, 05:34 PM   #6
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how much of a difference? Any dynos? Why 91 required?
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Old 07-19-2012, 06:51 PM   #7
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Quote:
Originally Posted by 1.5 View Post
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?
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Old 07-19-2012, 06:55 PM   #8
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Killer ! Did you use the yaris rods or the prius ones ? Also what apexi safc are you using , afc2 or the neo ?
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Old 07-19-2012, 11:09 PM   #9
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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
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Old 07-25-2012, 01:37 AM   #10
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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?
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Old 07-25-2012, 03:14 PM   #11
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1 week and no problems it feel great i am jus giving some miles for the breaking they fit perfectly...
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Old 07-25-2012, 04:53 PM   #12
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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.
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Old 07-26-2012, 11:43 AM   #13
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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?
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Old 07-26-2012, 11:51 AM   #14
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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?
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Old 07-26-2012, 11:52 PM   #15
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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
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Old 07-27-2012, 12:05 AM   #16
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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?
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Old 07-27-2012, 12:15 AM   #17
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Wow... 13:1 street 1Nz-Fe, cast piston, the compression ratio is similar to mazda sky active newest technology
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Old 07-27-2012, 07:00 AM   #18
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Quote:
Originally Posted by fast2882 View Post
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!
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