True dual a 03 5.7

[Harry Paratestes]

So as we know the 03 5.7s have 1 o2 before and 2 o2 after the cat. Im going to true dual it with no meow's. Offroad use only i swear.

Since the precat o2 actually does something for fuel adjustments (from my research) will it be ok to have that o2 in just 1 pipe? The second o2 will have a spacer put in before the o2 is screwed in to prevent a code. From what i understand the post cat o2 just monitors cat efficiency but will throw the a/f mix into open loop if it senses a bad cat which will be remedied by the spacer.
Thoughts?

 

[Harry Paratestes]

3 days ive been searching all Dodge ram forums and I still dont have an answer.
Does anyone know how picky o2 sensors are about a/f ratio at least? I wonder if its sensitive enough to know if only 1 bank is being read?

 

[HemiLonestar]

That's the fun part with an 03. If you're that firm about true duals then pick a bank and roll with it. The 03 ECM isn't that sophisticated, which is why it can't run MDS and why you can't just turn the rear O2 off in it.

 

[Harry Paratestes]

That's the fun part with an 03. If you're that firm about true duals then pick a bank and roll with it. The 03 ECM isn't that sophisticated, which is why it can't run MDS and why you can't just turn the rear O2 off in it.

Ok i sent a couple engine builders/tuners a message about it and well see what they say. Do you know any good tuners that would have more of an answer?

I also sent a couple people on here an other forums messages when i read they have true duals in their 03 but almost all of them are inactive for years and no email address listed...

 

[HemiLonestar]

Ask Sean (Hemifever), he's been futzing with these for along time.

 

[Wild one]

Ryan Hogan at FRP (Flying Ryan Performance)

Flyin' Ryan Performance

Texas-Based Mopar Parts House

frptuning.com

 

[Harry Paratestes]

Ok ill send them messages thank you both!