I changed the supercharger pulley to a 10 % pulley. Now at 5 psi of boost the engine breaks up. Why?
I would post that question on a Super Coupe forum ----- http://www.sccoa.com/forums/forum.php
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.
Looking for a Used Thunderbird in your area?
CarGurus has 23 nationwide Thunderbird listings starting at $13,595.
Search Ford Thunderbird Questions
Ford Thunderbird Experts
Related Models For Sale