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sbelyo · 06-08-2023, 02:16 PM

A few weeks back I picked up a 2013 ZL1 Auto with 60K miles on it. It has a 2.5" pulley, long tubes, we think no cats, 3 inch exhaust with X pipe all the way back to stock mufflers. I took it to a tuner here in Ocala FL with a good rep so he could take a look at it to make sure it was safe to drive it and get on it it etc etc without breaking it.. He put his laptop on it and took it for a drive. He said that its got good power but noticed that torque management was missing on the downshifts and that would kill the trans if left that way. He also said that the injector duty cycle hit 126% and this leaned out the motor with some detonation on the top end. He recommended replacing the stock fuel pump to fix the duty cycle issue. He mentioned that the stock fuel pump and injectors should be just fine with the mods that are on the car and that he's seen this before and fixed it by replacing the fuel pump. I agreed so I had him order the pump and will let them do the install along with replacing the rear mag ride shocks and a proper tune.

Is there anything else I should do?

06-08-2023, 02:16 PM	#1
sbelyo Drives: n/a Join Date: Jan 2015 Location: United States Posts: 84	2013 ZL1 with LT headers and a pulley, it needs a fuel pump A few weeks back I picked up a 2013 ZL1 Auto with 60K miles on it. It has a 2.5" pulley, long tubes, we think no cats, 3 inch exhaust with X pipe all the way back to stock mufflers. I took it to a tuner here in Ocala FL with a good rep so he could take a look at it to make sure it was safe to drive it and get on it it etc etc without breaking it.. He put his laptop on it and took it for a drive. He said that its got good power but noticed that torque management was missing on the downshifts and that would kill the trans if left that way. He also said that the injector duty cycle hit 126% and this leaned out the motor with some detonation on the top end. He recommended replacing the stock fuel pump to fix the duty cycle issue. He mentioned that the stock fuel pump and injectors should be just fine with the mods that are on the car and that he's seen this before and fixed it by replacing the fuel pump. I agreed so I had him order the pump and will let them do the install along with replacing the rear mag ride shocks and a proper tune. Is there anything else I should do?