Pass Emissions With No Cats ?

[Dave2000GT]

Can I pass emissions with the following setup ?

GT40p heads
Explorer Intake
Stock HO Cam w Crane 1.7 Roller Rockers
FRPP headers
73mm MAF
Offroad H-Pipe
Flowmasters

 

[Bullitt347]

In Oregon the answer is no. They do a visual inspection and when they stick the mirror under the car to look for the catalytic converters and see none, then they will fail you.

 

[smkshw]

+1....negative....

 

[revhead347]

It's a crapshoot. Some heavily modified cars pass the sniffer with no cats, and some stock Mustangs fail with cats.

Kurt

 

[Dave2000GT]

Ok I admit... This was a trick question.
Went through the sniffer this morning and passed no problem.

 

[revhead347]

How far off were your numbers. My Mustang aces emissions with cats. I haven't tried it without.

Kurt

 

[Dave2000GT]

How far off were your numbers. My Mustang aces emissions with cats. I haven't tried it without.

Kurt

Actually I don't know - the guy at the test station said I passed easy but when I looked at the printout later on it didn't have numbers just a PASS, I think you might only get it on a fail to help diagnose. Probably depends on state also, they all have different limits in place. This reminds me I need to update my profile I'm in WA now not OR.

 

[David Pepiton]

I passed with no cats though I have stock e7s egr and air pump.

 

[tonydalrymple]

It really depends on the state you live in; sometimes there is a difference between one county too another. Just for comparison's sake..... Max HC idle in Utah (Davis county) is 220PPM; measured at idle & 2500rpm. In SoCal (San Bernardino County); Max HC is 85PPM at 15mph & 67 at 25mph. You'd think the California test is tougher, and you'd be right for anything above idle. But cams with big duration numbers & tight lobe separation typically clean up well off idle; at idle the HC's can be pretty bad.... I played heck trying to pass Utah emissions with my custom cammed 331 stroker. But that's a story for another day....