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Exhaust 4.7L Exhaust Discussion


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  #21  
Old 12-01-2013, 12:55 PM
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Auto zone or similar, they are "help" brand like in the pic above. I got my exhaust done (at 3 am lol), will post pics later today...
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  #22  
Old 12-01-2013, 03:45 PM
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Ah ya can sleep when your dead,where's the pic's,lol.

Just kidding Sean,lol.
Looking forward to seeing the pic's,and your report on how it seems for power.
Rick
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  #23  
Old 12-01-2013, 07:45 PM
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Here's a link to my new exhaust:

http://ramforumz.com/showthread.php?...t=snrusnak+mod
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  #24  
Old 12-01-2013, 10:05 PM
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Moved this post up from the ARH headers thread

Thanks Sean.
I started going through your 80 pg build (holy crap,lad,lol),and had picked up the port spacing differances.

I only picked up the pic of a stock manifold and an earlier header though,but it damn near looks like a guy could cut and slice the flanges to work,but it'd take some tube reworking to make the modded flanges work.
And i don't think the gains would be worth the labour and cost though.

Has anybody tried porting the stock manifolds.
Is there enough wall material in the stock manifolds to get any gains from porting them.

Been looking at the 02 sensors,i'm tempted to start probing wires,they might sense oxygen content,but they still use an electrical signal to the computor.
I'm thinking there's gotta be a way a guy can duplicate the closed loop electrical signal to the putor .
Rick
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  #25  
Old 12-01-2013, 11:45 PM
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you're correct the O2 sensors send a voltage signal to the computer anywhere from 0.1 to 1.0 I believe. I think 0.5v is "correct". higher or lower voltage is lean or rich(don't recall which is which).
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  #26  
Old 12-01-2013, 11:58 PM
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Might have to look into this some more,a step down voltage regulator and some resistors might do it
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  #27  
Old 12-02-2013, 12:17 AM
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It'd be easy to come up with a stable 5 volts,and i'm wondering if a series of Diodes might work.
A diode drops roughly .75 volts give or take a bit,and Radio Shack sells 5 volt voltage regulators that can be fed off the battery to give a fairly stable 5 volt output.
HMM,gotta do some thinking on this,but i'm pretty sure it wouldn't be that hard to generate a .5 volt output to fool things.
Rick
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  #28  
Old 12-02-2013, 08:41 AM
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Yeah I'm not sure as I'm not that good with electronics. Another member had mentioned to me though how the "simulators" don't really work anymore (or may not anyway) because the computers are getting smarter. Not really sure what he meant or how though.

I used the nonfoulers for my rear O2's and so far so good, no CEL light. I also stuffed them with steel wool.
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  #29  
Old 12-02-2013, 11:36 AM
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Yea i'm curious about whether you'll turn a cel on.
Also thought about stacking the foulers,looks like there'd be clearance to double the foulers up,but not sure if that'd make any differance in whether it turns a light on or not.

If all it takes is a stable .5 volt to fool the putor,i think it's do-able Sean.
It'd take an add-on box,but i'm pretty sure with a few diodes /voltage regulator and a couple small capacitors you could come up with a way to generate the .5 volt.
Then you'd have to start probing to see which wire you'd have to tie into.
But that's only off the top of my head,so it's only a thought for now,lol
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  #30  
Old 12-02-2013, 11:50 AM
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I drove about 100 miles since I finished the exhaust and so far so good. REALLY hoping it stays good lol. Don't know what I'll do if I get a CEL, I'd probably have to switch to diablo/custom tune and lose the SC which would really suck.
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