I changed the supercharger pulley to a 10 % pulley. Now at 5 psi of boost the engine breaks up. Why?

Asked by Jul 14, 2017 at 05:35 PM about the 1994 Ford Thunderbird SC

Question type: Car Customization

2 Answers

79,475

I would post that question on a Super Coupe forum ----- http://www.sccoa.com/forums/forum.php

915

LOts of things need to be addressed after increasing boost. First, You will need more fuel. Bigger injectors are a start, but boost referencing and mapping a fuel curve should be in your future. Also timing. Higher cylinder pressures will require re timing the vehicle. Taking 5 to 7 degrees of total timing out will help but the entire timing curve should be adjusted.

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