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Flex Pipe broken... ECU? i/h/e? P72 vs emission

 
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Old 04-27-2011, 11:48 PM
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Icon5 Flex Pipe broken... ECU? i/h/e? P72 vs emission

So i recently had the revelation that my flex pipe is broken and found out the entire exhaust from the header back is rusted to oblivion... i think it's time i upgrade the exhaust... any suggestions? right now i am considering a custom exhuast built by a group out here in Long Island.

along with the exhaust i should think about the ECU; however, I find that if I convert to OBD-1 p72 for a hondata Sx00 chip, I would likely have to re-install the stock ecu to pass inspection... [correct me if i am wrong] ...... is there a more permanent solution?? chipping a honda OBD-2 ecu???

on a related note, is it really worth it to retain the IAB/secondary valves on the intake?? if i swap over to anything else [aside from stock or the GSR ECU] the functionality of those valves are gone.... are there any gains to be had by leaving them open all the time?

bit of back story
- cold air intake converted to short ram air
- AEM header... should be replace
- highflow cat is labeled OEM
- stage 1 cams
- "stockish" after market cat back exhaust
- constantly throwing a P0420 code ( I suspect the AEM header, no bank one pre-cat)

IN SHORT: i need to replace my exhaust, whats the best ECU chipping option to
[1] retain the secondary valves
[2] run upgraded exhuast or test pipe
[3] pass emissions without swapping the stock ECU back in
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Old 04-27-2011, 11:54 PM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

bonus question: who has the better headers for our vehicle?? i might as well do that too
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Old 04-28-2011, 12:33 AM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

Quote:
Originally Posted by luv28u0ut View Post
bonus question: who has the better headers for our vehicle?? i might as well do that too
HEADER!!! our cars only have ONE
also no need to back to back post just edit your first one

delete the iabs and use a blacktrax spacer, dyno proven to make power

hytech replica is the best bang for your buck, they can be found for around 300-400 shipped on prelude power

use a ktelller piping kit(at least 2.5in) and vibrant muffler

a p0420 code has nothing to do with the primary o2 sensor, if you SEARCH like for say on google it will point out that it is for the catalytic converter being below threshold ie not doing its job. your cat is most likely dead
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Old 04-28-2011, 11:30 PM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

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Originally Posted by LUDEZILLA View Post
a p0420 code has nothing to do with the primary o2 sensor, if you SEARCH like for say on google it will point out that it is for the catalytic converter being below threshold ie not doing its job. your cat is most likely dead
i thought a code 420 meant the lude wanted a good hotbox session
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Old 04-29-2011, 02:11 AM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

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Originally Posted by LUDEZILLA View Post
HEADER!!! our cars only have ONE
FACT: Preludes have a single HEADER on the exhaust

I was asking which company has better OPTIONS for me to buy a header

I thought over the years some companies have made more than just ONE type of header for the prelude... is that being presumptious... ANYWAY im not intending to start a fight, just wanted to correct my question... who has the better SET of header choices to pick from


Quote:
Originally Posted by LUDEZILLA View Post
a p0420 code has nothing to do with the primary o2 sensor .... catalytic converter being below threshold ie not doing its job. your cat is most likely dead
I didn't mention an O2 sensor and I know its not the cat... had it replaced three times in the first two years of owning the car [still about that ] .... at this point i am pretty sure with all the research that i did years ago... i have lurked in these forums a long time

I narrowed it down to it being the HEADER not having a pre-cat for bank one.... there isnt anything else to pin it on... and yes i have the correct cat on there... bought from honda direct

thanks so far for the input, anyone else have any suggestions???
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Old 04-29-2011, 02:24 AM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

J swap. it fixes all problems. My old engine was burning oil and throwing egr/cat codes all the time. Not anymore :D
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someone attempting to be a smartass while still not answering the question, useful. Research my balls in your mouth.
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Old 04-29-2011, 11:07 AM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

If you're only running one o2 sensor that would probably do it.I'm guessing that's what you mean by "precat one bank one" Also if you read my post again I recommended the hytech replica header, some of the best gains a header will get you
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Old 04-29-2011, 12:36 PM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

World Sport2 exhaust. 'nuff said.
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it'll sound like an ultralight airplane or a moped exhaust funneled through a kazoo.
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Old 05-01-2011, 07:22 PM
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Re: Flex Pipe broken... ECU? i/h/e? P72 vs emission

so i got talked out of fitting a completely new exhaust on... things are not that extreme to go that far yet... had a new flex pipe welded into place and now the exhaust is... ok, for now.

I still have an issue with the P0420 CEL code [and occasional P1399] and have not found a solution for the ECU modification.... Has anyone been able to reprogram their ECU without losing any functionality in the H22A4.

reminder, I have tried switching the cat several times, and am pretty sure its not the O2 sensors either. If i could just tune the vehicle, reliably, with a dyno-proven method.... that also keeps the car within resonable legal parameters, that would be great.

if it wasnt for needing to swap back and forth between stock and a p72 hondata S200, then i would be fine... but in order to pass inspection i hear that a P72 on a prelude won't pass (OBD1 can't pass computer inspection, as far i can tell )
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