ATLS2

anybody have any idea what will happen if I remove the restrictor plate on my ls2? I should be okay if I have good enough fuel, right?

jon6.0

You will get between 12-16psi depending on cam and exhaust setup. The more free flowing your setup is, the less the boost number will be. Probably somewhere in the mid 700's for RWHP if you have a cam.

SinisterC6

My air filter and thus restrictor plate fell off and I drove around for a while before noticing. The motor stayed in on piece.

You pick up 4psi or so without it. If you have adequate pumps and a boost referenced system it should be ok.

ATLS2

I mean bad stuff. What could happen to my stock block?

SinisterC6

Most likely scenario is the higher boost causes a lean condition which usually breaks a piston ring or the portion of the piston which the ring sits.

ATLS2

So, enough fuel will fix that?

SinisterC6

Its not only the amount of fuel. After 11psi you need more octane or a colder intake charge to prevent knock.

Race gas is the simplest solution but depending on availability it is inconvenient.

Use meth injection adds a little octane amd also cools the intake charge. People have gone a long way on pump and meth with forged motors.

7 to 800 tends to be the limit of the stock motor with many people living at 5to 700 without issue

MARSC6

You will need meth and to have it tuned for the higher boost. ECS kit with meth, headers, and fuel upgrade I'm seeing around 14 PSI and 735hp with the plate out. Still stock internals.

ATLS2

If I was to make any changes to my internals, would changing the pistons be the only thing I should consider? I've heard people say that getting new head studs and a LS9 gasket are also a cheap insurance.

jon6.0

I'm doing that to my car now since I snapped the stock timing chain. Forged rods and pistons with the stock crank. New cam, link bar lifters, and Katech C5R timing chain.

DOUG @ ECS

This is the "magic combo" we have been doing on hundreds of cars with great success.