Does anyone have a picture to the Bayou chip?
ECU/CHIP INFO
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Joe E - Florida
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We'll see, I have squeezed quite a bit more out of my civics. The ecus closed loop operations will use the stock o2 sensors to hold the afr around 14.7 during most partial throttle driving but depending on the engine you can go well into the 15s or even 16s in the higher vaccuum parts of the map. It would be fighting the o2 sensors unless they can be disabled but ill just have to wait and see what happens. People have rumored these cars run pretty rich stock which I dont know if that is true or not, eventually I will get a wideband on and see for myself. Honestly I am usually really skeptical if any worthwhile hp gains can found over the stock tune on a stock or bolt-ons car, but you guys seem pretty fond of these bayou chips. Most of the power will come from just adding a couple degrees more timing but if these cars do run pretty rich there may be some gains from adjusting the fuel curve as well. I will just have to wait and see, If I get this all figured out this spring I could probably go to a local dyno for an hour and test out all kinds of chips for a comparison.
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Beav,
Stock legends do run fairly rich 12-14. The bayou makes it run pig rich10-13. So hack away.
Khoe,
I was under the impression the solenoids that control the VIS are controlled by the ECU's ability to power the solenoid at the specific RPM, Im almost positive on that. Do you know something different?
~TRu Hybrid
Stock legends do run fairly rich 12-14. The bayou makes it run pig rich10-13. So hack away.
Khoe,
I was under the impression the solenoids that control the VIS are controlled by the ECU's ability to power the solenoid at the specific RPM, Im almost positive on that. Do you know something different?
~TRu Hybrid
That would have been my guess too, on the integra gsrs they have a 2 stage intake that is controlled by the ecu. Most of the tuning software out there for integras can easily change this rpm. Also if you are not using the vis you can use that an extra output to trigger something else at a certain rpm, like shift light or nitrous. Does anyone know what rpm they engage at? I can easily search the rom for key points if I know exactly what value I am looking for, I am pretty sure I have found the revlimiter this way.Dv8 said:
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Beav--can you recompile the assembly source?
Dv8--I had read a while back that VIS was manifold-pressure controlled, but that doesn't make sense to me, even from an empirical standpoint. ECU control seems more correct, because I can tell when the flaps open on my Legend, and it seems to be RPM-based. Kenso would know for sure.
k.
Dv8--I had read a while back that VIS was manifold-pressure controlled, but that doesn't make sense to me, even from an empirical standpoint. ECU control seems more correct, because I can tell when the flaps open on my Legend, and it seems to be RPM-based. Kenso would know for sure.
k.
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2,843 Posts
The VIS control solenoids are indeed operated by the ECU. The solenoids supply vacuum to the flaps via a vacuum reserve tank. So it would definitely be possible to change the VIS opening rpm points if you guys figure out the programming side of things. Good luck, nice to see progress being made.
Vacuum Tank A which uses a check valve to store vacuum correct Kenso? The ECU operated solenoids operate two different control diaphragms depending on engine load for low or high power.
Not the thread for this, but does anyone know of any problems that anyone has had with the PAIR valve (air suction valve) it is causing an odd bubbling noise and erratic idle.
Good luck Beav, I sent you a pm reguarding some of the things you are talking about and my interest to learn something about it. Like you said, I don't know how much more this could do for a stock engine than a Bayou chip, but I know it would be ideal for anyone running boost/nitrous/modified compression or anything that requires different timing and fuel mapping. This could also help with anyone wanting to change cam profile.
Not the thread for this, but does anyone know of any problems that anyone has had with the PAIR valve (air suction valve) it is causing an odd bubbling noise and erratic idle.
Good luck Beav, I sent you a pm reguarding some of the things you are talking about and my interest to learn something about it. Like you said, I don't know how much more this could do for a stock engine than a Bayou chip, but I know it would be ideal for anyone running boost/nitrous/modified compression or anything that requires different timing and fuel mapping. This could also help with anyone wanting to change cam profile.
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You know, I feel the same way about this car. I know some folks want to get another 10% more HP out of this car but for me, I'd be happy with another 10% MPG.beav said:
After all, for the same chunk of change you will always realize more gains in the turbo Civic vs. the Legend.
-g
you are right. But trust me, this is an exercise in finding HP,S4gunn said:
Bayou or better am I right ?
My next car will be a Civic .... What would the TOTAL cost be to turbo a 2004Civic to be our accelerate and outhandle a Legend[ in the city
Would this turbo-Civic be as heavy on gas as a Legend ?
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9,021 Posts
intake will give you better gas mileage if you drive NORMALLY(like no flooring etc). i would be down for a chipped ECU if this all works out 
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9,021 Posts
you can buy an intake of ebay
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242 Posts
My guy is out of town for two more days, I will have him get on here asap. Thanks for waiting. Beav, you will have to let me know what your progress is and I will end up putting you in communication with my guy.
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242 Posts
Christain if you are talking to Willy, can you ask him if he knows what the original program the ECU was tuned with?
If I can not find out that information I will have to take a factor bin file and go hit up a wideband dyno.
If I can not find out that information I will have to take a factor bin file and go hit up a wideband dyno.
ahhhahahah. this made me laugh.Stu said:
i have the .bin file for a couple of them. I got them from cap years ago. We both joined another forum to get some help and we tried to read it like a regular honda b or d series. Never could get the maps to show up. Looks like beav is way better than we were. I am not good at this, i was just trying to help.Joe Englebrecht said:
Looks like beav is getting it done. If i can assist in any way, let me know. And yes, the vis is ecu controlled. This would be really nice if you could make an economy and a tuned up version.
Update, the stock rom that was posted seems to be corrupt. I have socketed my stock ecu and dumped my stock rom which is all in the same format as the bayou/nsx roms I have already figured out, all the fuel and timing maps and column scalars make total sense and should be able to be modified, rev limiter shouldnt be much trouble either. It took a lot of tries to read the stock rom and get a clean dump, my guess is these older chips cannot read as fast as the newer eproms, this is probably why the other rom posted is corrupt. In the end I finally got it to consistently read cleanly and I was able to copy my stock rom and have a copy of it running perfectly in my socketed ecu so all should be good there.
Next hurdle is to try and successfully change some data. There should not be any need to try and recompile it yet because everything I want to play with right now can be changed by modifying the data regions with a hex editor. I tried changing the revlimiter super low just for testing and I also tried pasting in the stage II timing maps into a stock rom but both tests resulted in a solid CEL. This ecu seems to be like any other honda ecu where there is a backup program in the MCUs internal rom that will run the engine in limp mode if there is a problem detected with the chip. All other honda ecus run a checksum on the rom that has to check out so it can verify its data is not corrupt and any changes without fixing or disabling the checksum result in a solid CEL. Most other honda ecus the checksum of the rom is always 0x00 which makes it simple, none of the stock/aftermarket/nsx roms I have seen have a 0x00 checksum so I am not quite sure what its looking for, it may only run a checksum of certain areas of the rom. I tried setting the checksum on my modified rom back to what it was stock but still got a solid CEL. When I get some more time tommorrow I will have to trial and error some more to see if I can figure out what works. If I can just get around this issue we should be home free.
Next hurdle is to try and successfully change some data. There should not be any need to try and recompile it yet because everything I want to play with right now can be changed by modifying the data regions with a hex editor. I tried changing the revlimiter super low just for testing and I also tried pasting in the stage II timing maps into a stock rom but both tests resulted in a solid CEL. This ecu seems to be like any other honda ecu where there is a backup program in the MCUs internal rom that will run the engine in limp mode if there is a problem detected with the chip. All other honda ecus run a checksum on the rom that has to check out so it can verify its data is not corrupt and any changes without fixing or disabling the checksum result in a solid CEL. Most other honda ecus the checksum of the rom is always 0x00 which makes it simple, none of the stock/aftermarket/nsx roms I have seen have a 0x00 checksum so I am not quite sure what its looking for, it may only run a checksum of certain areas of the rom. I tried setting the checksum on my modified rom back to what it was stock but still got a solid CEL. When I get some more time tommorrow I will have to trial and error some more to see if I can figure out what works. If I can just get around this issue we should be home free.
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