The 1.4 T Sonic and Cruze comes with very light valve springs from the factory. Whenever you bump the rev limiter and/or boost the valve springs will start to float. This is bad for a few different reasons, it is hard on the valves/valve seats themselves, and it reduces power because the valves are not opening and closing properly like they should. When you install our ZZP valve springs, you will be able to rev the car out further and make power power at the top of the rev range. The stock valve springs are measured at 42# and these are 82#. We now sell our custom valve spring tool to make installation that much easier!
These valve springs feature a higher seat and opening pressure than our standard 72# valve springs and are meant for large turbo builds that want to rev over 7500rpm and/or over 22psi of boost. We recommend our standard valve springs for cars running a simple bolt on big wheel turbo, but for the Z04 or larger turbos these are your valve spring. We also highly recommend pairing them with our ZZP high RPM lash adjusters and ZZP rocker guard.
This item comes in four different configurations:
-Valve Springs only (with or without valve spring tool)
-Valve Springs & Titanium Retainers (with or without valve spring tool)
About our Titanium Retainers:
In out quest for continually pushing the platform, we found ourselves at the point where even with our upgraded springs, we were fighting valve float at high boost and lift levels. After researching the issue, we found that the reused stock retainer is a significant portion of the valve/retainer/keeper assembly's mass. As ZZP does, we immediately began working on the solution.
These Titanium retainers are made to directly replace the stock retainers on our upgraded 1.4 valve springs, and reduce reciprocating mass by as much as 17%! This results in a significant improvement in valvetrain stability and a much larger window before valve float occurs, matching perfectly with our camshaft package.
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