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KingLT1 · 05-18-2023, 08:38 AM

Stock LT4 fuel system should keep up with your Mods on E50 @ .84-.85 Lambda with a low side upgrade. I have cars doing that with just a JMS on stock tank pump. If you run richer you run out of fuel system a lot sooner. If you run leaner, you can go further. I personally wouldn't run leaner than .85

The exhaust leak sounds plausible. It would cause the wideband to show lean and then you would be adding fuel to compensate for a false lean condition which will run the fuel system out of headroom sooner that it should for the mods and power level.

05-18-2023, 08:38 AM	#7
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 7,663	Stock LT4 fuel system should keep up with your Mods on E50 @ .84-.85 Lambda with a low side upgrade. I have cars doing that with just a JMS on stock tank pump. If you run richer you run out of fuel system a lot sooner. If you run leaner, you can go further. I personally wouldn't run leaner than .85 The exhaust leak sounds plausible. It would cause the wideband to show lean and then you would be adding fuel to compensate for a false lean condition which will run the fuel system out of headroom sooner that it should for the mods and power level. __________________ 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel Last edited by KingLT1; 05-19-2023 at 09:31 AM. Reason: edited out dyno numbers because they all read different.