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Old 04-04-2020, 08:09 AM   #5

Drives: YELLOW 2013 ZL1 AUTO
Join Date: Jun 2009
Posts: 15,006
Originally Posted by JoeRoge View Post
Hey guys i recently ordered the lingenfelter 630hp package for my zl1.. itís got a 2.55 upper pulley with hub, solid isolator bearing, ngk tr6 plugs, and 160 degree thermostat, and bando belt. i already have a roto fab cai, and jlt catch can.. iím ordering 2Ē tsp headers and local shop told me i need injectors also since the lsa injectors are maxed out with just intake and headers....?? is this true or will the car be fine with the factory injectors?
You will most certainly need injectors.

LPE developed the 630 package on a CTSV which has a dual fuel pump system that runs much higher fuel pressure so they were able to get away with stock injectors on the CTSV

Evidently they never properly tested this package on the ZL1 and just added the ZL1 to the fitment of that kit since they share the LSA engine.

The ZL1 runs out of injector anything larger than 10% overdrive on the supercharger due to single fuel pump and lower operating pressure of fuel system.

2.55 is 18%.

So the pulley alone puts you in need of larger injectors on the ZL1 add headers and cold air and the demand for fuel goes up.

Your tuner is correct.

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