Brian Crower Valve Spring Question - Toyota Yaris Forums

theinteriorautomechanic · 06-02-2023, 10:50 PM

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.

Turbiini · 06-03-2023, 02:06 AM

i had valve float about 7000rpm na and 6800 with turbo.

lani100 · 06-03-2023, 06:28 AM

Stronger springs are a must for reliability especially at higher rpm

mitch9521 · 06-04-2023, 01:58 AM

Pretty much a mandatory upgrade if you plan on spinning it over 7 grand.

remcafee · 06-05-2023, 03:44 PM

also leave the stock crank pulley on if youre reving that high, lightened pulley will disintegrate

Cletus Garfunkle · 06-08-2023, 11:39 PM

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!

06-02-2023, 10:50 PM	#1
theinteriorautomechanic Drives: Slowcart Join Date: Dec 2022 Location: KY Posts: 21	Brian Crower Valve Spring Question 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.

06-03-2023, 06:28 AM	#3
lani100 Drives: Yaris T sport TRD turbo Join Date: Aug 2017 Location: Netherlands Posts: 105	Stronger springs are a must for reliability especially at higher rpm __________________ 2004 Yaris T-Sport 1NZ-FE with TRD Turbo

06-04-2023, 01:58 AM	#4
mitch9521 Gen 3 > Gen 2 Drives: NCP131, F-150 Join Date: Jul 2019 Location: Red Deer, AB Posts: 501	Pretty much a mandatory upgrade if you plan on spinning it over 7 grand. __________________ 2014 NCP131 5 Speed 2007 F150 4.2L 5 Speed 2013 Rav4 LE AWD Autotragic - Wife's

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
lowering spring specs for Yaris	botchilah	Wheels, Tires and Suspension Forum sponsored by The Tire Rack	20	03-22-2017 09:47 AM
PCV valve question	window_lee	DIY / Maintenance / Service	31	10-22-2014 05:05 PM
Track Suspension	id3379	Wheels, Tires and Suspension Forum sponsored by The Tire Rack	85	06-11-2009 06:59 PM
spring rates question	botchilah	Wheels, Tires and Suspension Forum sponsored by The Tire Rack	4	05-11-2009 01:33 PM
BailOut's Interview: Conservation in 2009 and Beyond	ChinoCharles	Fuel Economy Forum	43	02-24-2009 04:03 PM

06-03-2023, 02:06 AM	#2
Turbiini Drives: 1983 carina 2NZ-FTE Join Date: Dec 2020 Location: finland Posts: 45	i had valve float about 7000rpm na and 6800 with turbo.

06-05-2023, 03:44 PM	#5
remcafee Drives: 2007 Toyota Yaris 3 door Join Date: Sep 2018 Location: Arizona Posts: 405	also leave the stock crank pulley on if youre reving that high, lightened pulley will disintegrate

06-08-2023, 11:39 PM	#6
Cletus Garfunkle Average KKT User Drives: 2001 Echo Join Date: May 2020 Location: Direct X Address Posts: 41	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!