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#1 |
![]() Drives: Slowcart Join Date: Dec 2022
Location: KY
Posts: 21
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Hi all I'm in the process of building my Yaris currently. Currently I am going all motor. I have done the following: AEM CAI, Weapon R Header, Tooter Intake Runner Extender, 2AZ throttle body, port matched intake manifold, 1ZZ injectors, and FTG Tuning Reflashed ECU with higher redline.
My question is with the increased rpms and (hopefully) more horsepower should I consider upgrading to Brian Crower Titanium Valve Springs and Retainers or will stock springs be ok? I'm planning on doing autocross and track days with it so dependability is super important. |
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#2 |
![]() Drives: 1983 carina 2NZ-FTE Join Date: Dec 2020
Location: finland
Posts: 34
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i had valve float about 7000rpm na and 6800 with turbo.
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#3 |
![]() ![]() Drives: Yaris T sport TRD turbo Join Date: Aug 2017
Location: Netherlands
Posts: 105
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Stronger springs are a must for reliability especially at higher rpm
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2004 Yaris T-Sport 1NZ-FE with TRD Turbo |
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#4 |
Gen 3 > Gen 2
Drives: NCP131, F-150 Join Date: Jul 2019
Location: Red Deer, AB
Posts: 498
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Pretty much a mandatory upgrade if you plan on spinning it over 7 grand.
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2014 NCP131 5 Speed 2007 F150 4.2L 5 Speed 2013 Rav4 LE AWD Autotragic - Wife's ![]() |
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#5 |
![]() ![]() ![]() Drives: 2007 Toyota Yaris 3 door Join Date: Sep 2018
Location: Arizona
Posts: 405
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also leave the stock crank pulley on if youre reving that high, lightened pulley will disintegrate
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#6 |
Average KKT User
Drives: 2001 Echo Join Date: May 2020
Location: Direct X Address
Posts: 41
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I would only think about springs if I put a cam in the car. New springs and retainers could never hurt probably increase reliability a lil bit. I've never or don't think I've ever had problems spinning to 8k with stock springs or rods beating the sh!t outta it for 6 months. Have you thought about porting the head if you were to go through all the trouble to change springs? This is my personal opinion ofc. If you want to spend the time and money go for it learn something new in the process make it more reliable what's wrong with that!
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