CAMARO6 - View Single Post - Magnuson 2650 kit and ZL1 OEM have slightly different objectives

JimGnitecki · 10-16-2022, 10:54 PM

Thanks, Toohighpsi! Your explanations for the 2 dyno charts are very helpful. But, I am confused when you say:

"Jim, it's not really a Magnuson SC or tune choice, it's the engine that deems this behavior. The LT1 with 11.5:1 compression ratio cannot run the higher blower speed (boost) or timing at lower RPMs that the LT4 can with its 10:1 compression ratio. So the LT4, by design, is going to have a nice wide full throttle torque curve - at the cost of fuel efficiency."

This SEEMS to be saying that the LT4 (ZL1) engine should have the broader torque curve (more torque and thus power at lower rpm), but my charts and table earlier show that the LT1 with the 2650 has better power at lower rpm than the LT4. Did I misunderstand what you said?

Jim G

10-16-2022, 10:54 PM	#9
JimGnitecki Drives: Chevrolet Camaro LT1 Join Date: Sep 2022 Location: Alberta Posts: 336	Thanks, Toohighpsi! Your explanations for the 2 dyno charts are very helpful. But, I am confused when you say: "Jim, it's not really a Magnuson SC or tune choice, it's the engine that deems this behavior. The LT1 with 11.5:1 compression ratio cannot run the higher blower speed (boost) or timing at lower RPMs that the LT4 can with its 10:1 compression ratio. So the LT4, by design, is going to have a nice wide full throttle torque curve - at the cost of fuel efficiency." This SEEMS to be saying that the LT4 (ZL1) engine should have the broader torque curve (more torque and thus power at lower rpm), but my charts and table earlier show that the LT1 with the 2650 has better power at lower rpm than the LT4. Did I misunderstand what you said? Jim G