OBX RX8 Header
#401
Smooth Criminal
Originally Posted by Nemesis8
#402
always preoccupied.
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Originally Posted by Nemesis8
#404
Bigus Rotus
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OD, I don't want to hijack the thread, so I responded over here:
https://www.rx8club.com/showpost.php...&postcount=319
https://www.rx8club.com/showpost.php...&postcount=319
Originally Posted by olddragger
Nem
How much mantinance work with the CZ and our learning ecu? In time does the ecu finally overwrite the CZ?
Olddragger
How much mantinance work with the CZ and our learning ecu? In time does the ecu finally overwrite the CZ?
Olddragger
#406
Registered
Some of you have already seen this but just in case... It's Marietta 8's Dyno run showing his header at extremely high temp! Go to my site and follow the obvious links. OD, I know you will get a kick out of it.
https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/video-red-hot-headers-renisis-82753/
https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/video-red-hot-headers-renisis-82753/
#409
Smooth Criminal
#411
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I think they fixed the issue with the air pump(now there is a place to mount it) but not the location of the O2 sensor. I believe it is still on one pipe and not where all 3 pipes collect together. This could and probably give a bad reading to the ECU.
Last edited by JB_Rotary; 01-25-2008 at 10:17 AM.
#412
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this shouldent matter for people running catless right?
#414
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+1 this is really the correct way to solve the problem.
People running catles will probably get all kins of crazy readings. O2 sensor 1 will see way fewer emissions than O2 sensor 2. I'd imagine this would cause the car to tune incorrectly.
People running catles will probably get all kins of crazy readings. O2 sensor 1 will see way fewer emissions than O2 sensor 2. I'd imagine this would cause the car to tune incorrectly.
#415
Tony says, RX8s are GREAT
^ very interesting... searching the forums and internet for rotary worth cats, working on ideas.. well i bought the obx too.. ill do a baseline and then one with the obx header (with the bung relocated)..
also for another project im working on.. does anyone here have any info at all on how the actual exhaust flow leaves the engine at the exhaust port.. meaning which way does it flow as it flows out.. yes this is important data to have when making a header..
i dont know if some people just make headers thinking equal length is the only important factor..
at high flow and high rpm.. ehxaust port exit flow must be equally matched to the header angled entrance where it bolts to the block
you guys catch my drift?
this exhaust flow data is what i need before i start my header design..
maybe i just gave one idea away.. but ive got more!!!!
ben
also for another project im working on.. does anyone here have any info at all on how the actual exhaust flow leaves the engine at the exhaust port.. meaning which way does it flow as it flows out.. yes this is important data to have when making a header..
i dont know if some people just make headers thinking equal length is the only important factor..
at high flow and high rpm.. ehxaust port exit flow must be equally matched to the header angled entrance where it bolts to the block
you guys catch my drift?
this exhaust flow data is what i need before i start my header design..
maybe i just gave one idea away.. but ive got more!!!!
ben
#418
The Professor
^ very interesting... searching the forums and internet for rotary worth cats, working on ideas.. well i bought the obx too.. ill do a baseline and then one with the obx header (with the bung relocated)..
also for another project im working on.. does anyone here have any info at all on how the actual exhaust flow leaves the engine at the exhaust port.. meaning which way does it flow as it flows out.. yes this is important data to have when making a header..
i dont know if some people just make headers thinking equal length is the only important factor..
at high flow and high rpm.. ehxaust port exit flow must be equally matched to the header angled entrance where it bolts to the block
you guys catch my drift?
this exhaust flow data is what i need before i start my header design..
maybe i just gave one idea away.. but ive got more!!!!
ben
also for another project im working on.. does anyone here have any info at all on how the actual exhaust flow leaves the engine at the exhaust port.. meaning which way does it flow as it flows out.. yes this is important data to have when making a header..
i dont know if some people just make headers thinking equal length is the only important factor..
at high flow and high rpm.. ehxaust port exit flow must be equally matched to the header angled entrance where it bolts to the block
you guys catch my drift?
this exhaust flow data is what i need before i start my header design..
maybe i just gave one idea away.. but ive got more!!!!
ben
#419
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How so? The location of the first O2 sensor on the stock header is after all 3 pipes are collected so it would get data base on both rotors. The location on the OBX header is on only 1 pipe and it isn't even the middle one so it would only see part of the exhaust from the rear rotor. Wouldn't the ECU try to trim the fuel curve since the value it receives from the 1st O2 sensor is way less than the amount of feedback it receives from the sock location?
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How so? The location of the first O2 sensor on the stock header is after all 3 pipes are collected so it would get data base on both rotors. The location on the OBX header is on only 1 pipe and it isn't even the middle one so it would only see part of the exhaust from the rear rotor. Wouldn't the ECU try to trim the fuel curve since the value it receives from the 1st O2 sensor is way less than the amount of feedback it receives from the sock location?
Having the WBO2 sensor in the rear rotor might not be all that bad considering for whatever reason that is the first rotor to usually have a misfire.
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the first O2 sensor is the WBO2 sensor which controls the fuel trims. The second is used mainly to check for catalyst efficiency.
Having the WBO2 sensor in the rear rotor might not be all that bad considering for whatever reason that is the first rotor to usually have a misfire.
Having the WBO2 sensor in the rear rotor might not be all that bad considering for whatever reason that is the first rotor to usually have a misfire.
#422
Tony says, RX8s are GREAT
most likely.. but i need hard data, i guess when i get back from canada ill do some test.. ill have to see if the angle actually changes under wot... i know it seems like it shouldnt, but i need data so i can make the correct angle, no matter how small.. i need data!!! hahahaaha
if i made a good gain with the header, it will be released with the website if all goes well...
if i made a good gain with the header, it will be released with the website if all goes well...
Last edited by Benjamz; 01-29-2008 at 03:36 PM.
#425
So the OBX header almost the same weight as stock, maybe save 2 to 3 pounds (14.4 pounds?). Not much savings there.
In comparison the R-magic header weighs 11 pounds vs 16.75 pounds for the stock weight, but that is not that much either, and its very expensive (around $1,000 dollars). Knight Sports header weighs 15 pounds, but has 4 pipes instead of 3. However HP result seems to be the same at around 5HP and it costs $1,000 dollars +
Nobody has clearly indicated a performance increase for the OBX. Maybe it will give 5 HP?
Any owners that have the OBX header and have not modified it in some weird way, what do you think of it? Any O2 sensor related problems?
Is it worth it?
In comparison the R-magic header weighs 11 pounds vs 16.75 pounds for the stock weight, but that is not that much either, and its very expensive (around $1,000 dollars). Knight Sports header weighs 15 pounds, but has 4 pipes instead of 3. However HP result seems to be the same at around 5HP and it costs $1,000 dollars +
Nobody has clearly indicated a performance increase for the OBX. Maybe it will give 5 HP?
Any owners that have the OBX header and have not modified it in some weird way, what do you think of it? Any O2 sensor related problems?
Is it worth it?
Last edited by sosonic; 02-19-2008 at 01:30 AM.