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turbo lag......yeeeeehaaaaaaw
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682 Posts
99-03 had a waste-gate.03 on the 6.0 and up have a variable vane that acts as a waste-gate. Ford is having problems with these sticking and causing over-boost conditions. To make it worse the new 6.4 to replace the 6.0 has two turbos that are both variable vane but are set up in sequential instead of a true dual.
 

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World Class ASE tech
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704 Posts
94-97 powerstroke trucks do not have a waste gate and are not charge air cooled. Ford did not sell a 98 model truck. They went straight to 99 and the new body style. The trucks made and sold in 98 were sold as 99. The 99-03 7.3 has a waste gate and is charge air cooled. Being charge air cooled they make more power.
 
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