VVT delete limiter lockout information wanted
However I'm not sure if a lot of lift with the right spring wears it out more. For example I don't know if a aftermarket spring with a 600 lift cam will wear faster than a OE style spring with say 525 lift. I figure springs wear regardless and ramp rates likely have more of an effect than actual lift.
I read a discussion one day that was pretty interesting where they said higher lift is actually easier on some of the valve train components (springs included) because the higher lift has (in general) a smoother arc across the lobe from open to close. For example on that you may see more of a jump off of the seat then kind of a flatten out of the lift then the off ramp on a lower lift versus a smoother arc from open to close with higher lift. It's going to be very subjective of course. In other words with some low lift lobes, that get the valve off the seat early you may see more of a squared off shape of the lobe versus a more consistently smooth arc.
I figure that ramp rates (rapid collapse of the spring) coil bind and float are the worst killers. And high lift with a smooth actuation can allow springs to live for quite a while. But I also see how high lift isn't necessarily nice to a spring. I don't know, I'm not a guru here. Just regurgitating info.
I never have come across any threads where people have discussed valve spring life where they tested different ramp rates and lifts etc. It would be cool to see. On the flip side, i've seen many broken springs with stock cams.. Had it happen on 2 of my personal vehicles in the past. One was my fault for turning up the rev limiter at 140k miles and living on that limiter every day for way too many miles.
Last edited by 00pooterSS; Apr 3, 2020 at 11:34 AM.
I do know one thing though about gen 5 and vvt. There's a ton of videos and info, and parts available on phaser limiters. So the cams are out there that allow at least some vvt.
I'm glad this post came out though because for some reason I really thought the TSP cams allowed vvt now I have to rethink my future plans..
I'm glad this post came out though because for some reason I really thought the TSP cams allowed vvt now I have to rethink my future plans..
Staging Lane
Joined: Feb 2012
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From: El Paso Texas
a vvt cam wiht a lock out is basically a non vvt cam it wont advance or retard
TECH Senior Member
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On Gen5 engines, Most shops are now using the zero degree lockout that eliminates any VVT adjustment and it still allows the use of the factory cam phaser. Even the 4 degree limiter kits were showing odd behavior at high RPM. Contact GPI or Brett Stewart for more info on it.