L8APEX

that is one of the higher power curves i have seen on an NA 8. The rest of us are envious.

ddub

Not planning on getting an interceptor or something. Used Microtech most likely, can get them for about $500 or so if you look.

olddragger

iTrader: (3)

Nem
How much mantinance work with the CZ and our learning ecu? In time does the ecu finally overwrite the CZ?
Olddragger

Nemesis8

iTrader: (3)

OD, I don't want to hijack the thread, so I responded over here:

https://www.rx8club.com/showpost.php...&postcount=319

olddragger

iTrader: (3)

thanks Nem
OD

SilverEIGHT

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/

heyarnold69

iTrader: (1)

should I get an OBX header. yes or no? Sorry got lost in the ramblings

d j

let me know if you want one... I still have mine, I got it used but never installed it.

L8APEX

basically...no. no gains, it needs modifications to work right...yeah, no.

Benjamz

i thought the new obx headers had the correct design

JB_Rotary

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.

Jeromie

this shouldent matter for people running catless right?

Benjamz

seal the bung, weld a new one where they collect, problem solved

JB_Rotary

+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.

Benjamz

^ 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

nelsonrx8

buy it and turn it into a turbo header

Keef

yalls "thinking" it might get a bad tune based on the O2 sensor is the most worthless opinion's ever...

staticlag

It gets redirected 90 degrees at the ports, so it likely comes straight out.

JB_Rotary

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?

r0tor

iTrader: (1)

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.

JB_Rotary

I have noticed that. When I still had the K&N type 1 on my car the rear rotor was always the one to misfire. I guess other have use the OBX without issue so I guess my point is moot. I would just think you want to mirror the stock location.

Benjamz

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...

PARTEO

I would like to know your opininon about the exoticspeed header

Mikeluvs8

there all the same, only difference o2 location.

sosonic

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?