Catalytic Converter Question

[Seabiscuit]

How do you improve performance with a truck that has california emissions?

 

[rickcdewitt]

took the words out of my mouth allen.hes got pretty much the same cat as a 4.0l,plenty of flow.i took the one of my 91 exploder and put it on my 91 ranger 2.9l.much larger than the early 80's cat.

 

[rickcdewitt]

How do you improve performance with a truck that has california emissions?

buy only c.a.r.b. certified headers,chips, etc. and make sure your mixture stays somewhat lean.

 

[MAKG]

buy only c.a.r.b. certified headers,chips, etc. and make sure your mixture stays somewhat lean.

Mostly. The mixture must stay controlled, which does generally mean slightly lean -- but switching back and forth to slightly rich. If you make a lean mixture all the time, your engine might detonate and you'll have high NOx emissions.

A far easier answer to deal with is to leave the engine alone and improve total vehicle performance by screwing with gears, tires, and the transmission. The first part of this is defining what you mean by "performance." If it's something you can feel in the seat of your pants, it's probably not the usual power modifications. Power may or may not improve acceleration, and can make things significantly worse at low RPM. Note that increasing low and medium RPM acceleration by 30% or more is doable with gearing (in the rear end or transmission), but making the engine produce 30% more torque is VERY difficult.

 

[AllanD]

ALL the engine mods that anyone has ever done (excepting forced induction or Nitrous Oxide) doesn't ammount to diddly compared to a gear swap.

AD