JWT Cams + aftermarket Valveprings ?

[livelovesole]

I have a set of JWT S3 cams and I know their designed for stock valvetrain, but I wanna know any pros and cons about using aftermarket valvesprings ie: JWT, BC springs. Thanks for any input.

[Kingtal0n]

never upgrade springs unless the application calls for it. the weaker the valvespring, the less wear and tear on your top end. Usually we upgrade springs when the lift starts going up because you do not want the valve slapping down on the seat and bouncing. however, the major anemia of the sr20det head is in the duration of the camshaft, NOT the lift. simply increasing the duration with no change to the lift will allow the stock head to support usually around 350-380rwhp @ 18psi on pump gas before 7000rpm, which is exactly where you want to be on the street in a daily driver with a stock (otherwise) sr20 engine.


with oem camshaft duration you are stuck around 320rwhp with the same boost.

[cotbu]

never upgrade springs unless the application calls for it. the weaker the valvespring, the less wear and tear on your top end. Usually we upgrade springs when the lift starts going up because you do not want the valve slapping down on the seat and bouncing. however, the major anemia of the sr20det head is in the duration of the camshaft, NOT the lift. simply increasing the duration with no change to the lift will allow the stock head to support usually around 350-380rwhp @ 18psi on pump gas before 7000rpm, which is exactly where you want to be on the street in a daily driver with a stock (otherwise) sr20 engine.


with oem camshaft duration you are stuck around 320rwhp with the same boost.

True, just adding what I found out. The intake cam is the hindering factor limiting the power to about 330rwhp. And with a change to a 256 intake greddy easy cam we were able to hit 350 @ 17Psi with a 2871r. 2🇨🇪🇳🇹🇸

Sent from my Highly Tuned Galaxy S3.4!!!

[TheRealSy90]

I've been running JWT S4's for 4+ years on stock valve train with no problems.

[livelovesole]

Thanks for the input guys.

[inopsey]

never upgrade springs unless the application calls for it. the weaker the valvespring, the less wear and tear on your top end. Usually we upgrade springs when the lift starts going up because you do not want the valve slapping down on the seat and bouncing. however, the major anemia of the sr20det head is in the duration of the camshaft, NOT the lift. simply increasing the duration with no change to the lift will allow the stock head to support usually around 350-380rwhp @ 18psi on pump gas before 7000rpm, which is exactly where you want to be on the street in a daily driver with a stock (otherwise) sr20 engine.


with oem camshaft duration you are stuck around 320rwhp with the same boost.

if you have weak springs the chances of the cylinder being able to make maximum ve greatly decreases; maximum power cannot be achieved. valve springs are a wear item, they are always in a compressed or decompressed position even on an engine not being used. the springs in an oem engine are 15+ years old. you do not need stiffer than stock/higher lift springs to run jwt s3 cams but it is always a good idea to put fresh springs in to get the most of the cams.

i know of plenty of sr20 engines that use stock cams and make over 320 whp on a mustang dyno. if you want to keep your experience to the overrated gt2871 turbo then you may be right about the power on stock cams at 320whp.