VK45 –Stage 1 Headers/JWT cams/TB/intake
- Thread starter Logan
- Start date
even an obdII only emissions test still requires the inspector to make a visual inspection first. aside from checking safety items like brakes, tires, lights & seat belts etc, they are also "supposed" to check for any emissions system tampering, which if detected should automatically fail the vehicle, before the obdII is even plugged in & regardless of if the CE light is on or not. luckily the majority of inspectors either don't really know what there looking at or just don't care, but technically even just O2 spacers alone are grounds for immediate failure. believe it or not, even a catch can should tecnically cause a vehicle to fail, because to the letter of the law no alterations, deletions or additions to the factory emissions systems are allowed in any way at all unless they are carb exempt. the positive crankcase ventilation system is a part of emissions control systems so even the addition of a catch can is "technically" in violation of the no tampering law... especially a vented catch can setup which is technically a gross violation as it's designed to vent "emissions" that are required to be contained. also headers, since there before the cats, are also technically a violation too, unless they are carb exempt. cat back is not regulated in any way other than noise because that doesn't affect emissions but upstream of the cats def is part of the emission control systems.
this is federal law too, so even if local authorities don't enforce, doesn't mean it's fine... but, all that really matters to most is that they pass inspection. luckily most places don't go over the vehicle well enough to pick up these things in most cases. many inspection stations will just plug in & if there are no codes then they pass the emissions portion of the inspection, but that doesn't mean that technically they couldn't fail.
anyway, in the end I guess all's we really care about is passing, & in most cases if the CE light is off & the readiness monitors are set then it'll pass so it may not pay to be too worried, but it's good to at least know the technicalities involved. the federal emissions laws do apply even if local doesn't enforce, but without local enforcement then there really is no one else to enforce the federal requirements...
lance, this is an example for you, but not the place to buy them... if you need a source I'll dig to see where I got mine but heres an idea of what there like at least : http://www.mandrelbendingsolutions.com/servlet/the-812/100,cpsi,-Cell,-Hi-dsh-Flow,-High,/Detail
these will almost always require O2 spacers as there really not efficient enough to satisfy most obdII parameters & will usually kick on a CE light without spacers, but they ARE technically cats so they will usually be enough to pass most state inspections
this is federal law too, so even if local authorities don't enforce, doesn't mean it's fine... but, all that really matters to most is that they pass inspection. luckily most places don't go over the vehicle well enough to pick up these things in most cases. many inspection stations will just plug in & if there are no codes then they pass the emissions portion of the inspection, but that doesn't mean that technically they couldn't fail.
anyway, in the end I guess all's we really care about is passing, & in most cases if the CE light is off & the readiness monitors are set then it'll pass so it may not pay to be too worried, but it's good to at least know the technicalities involved. the federal emissions laws do apply even if local doesn't enforce, but without local enforcement then there really is no one else to enforce the federal requirements...
lance, this is an example for you, but not the place to buy them... if you need a source I'll dig to see where I got mine but heres an idea of what there like at least : http://www.mandrelbendingsolutions.com/servlet/the-812/100,cpsi,-Cell,-Hi-dsh-Flow,-High,/Detail
these will almost always require O2 spacers as there really not efficient enough to satisfy most obdII parameters & will usually kick on a CE light without spacers, but they ARE technically cats so they will usually be enough to pass most state inspections
Last edited:
I've got codes on codes on codes, but I just gave up on getting them fixed with the current ECU issues. Right now, there will always be some code for me. I only had issues with the second O2 sensor readings, so I think they were disabled with Osiris.
I currently have the 91 tune on there. I can get tunes on and off just fine, but it must be done with the Osiris software, which I do at the tuner's shop. Basically I just have the TS style tune, one tune that can't be changed. I've also lost the function of my cruise control. I still need to get my true ECU Rom patched and reflashed onto my ECU, but who knows how long that will take.
I need an oil change soon, so it will be fun to see what the dealer says. I've gotten pretty much used to the light being on at this point.
I need an oil change soon, so it will be fun to see what the dealer says. I've gotten pretty much used to the light being on at this point.
Sideways the Seven
Member
I would go for the HFC just for the extra insurance in case of a visual check. Really kinda depends on the area though. They used to have those roadside sniffers pop up from time to time here, but I haven't seen one in a long while.
Yeah, just another 2007 35 with RWD and laser cruise to get the ECU code sent to UpRev for modifying. Right now I guess I have the non-ICC ECU code on there.
Just joined the forum to stay informed with this thread. Thanks tony for linking it. I have an 06 M45 and def. Would be interested in this NA power. First id like to thank the OP for taking this leap in doing this and showing all of his progress. Some people attempt mods and don't give out info and keep it hush hush. enough of all that stuff and time for some questions. OP what mods did you have prior to this? From this thread looks like you have UpRev and with you having over 3k posts sorry for not using the search lol. What kind of dyno was it on and have you taken it to the track to see what difference it made in the 1/4 mile? Once all this is done do you have anything else planned in the making? Def. Post a sound clip when u can even if you only have long tubes on!
Sapcer/antifouler - Pretty much what you are saying, helps avoids Check Engine Lights when you eliminate the second cats. Pulls the Oxygen Sensor further away from the exhaust gas stream. Some units use a "J" shape that allows the O2 sensor to be installed parallel to the exhaust pipe for better clearance in tight spots (that would be me)
here's how it works
in closed loop the O2 sensor gives feedback as to rich or lean condition...
the computer then compares this actual reading to a predetermined ideal target parameter that it reads from a map & it compensates & adjusts according to the feedback from the O2 sensor.
if it's lean relative to the parameter it wants to see then it will add to the fuel count. eventually it will become rich, it then takes away from the fuel count, it then eventually runs lean & it again adds to the fuel count.
this all happens in milliseconds & it's a constant waveform of rich-lean-rich-lean-rich-lean at many times per second & all oscillating above & below, but right around it's targeted parameter for the most part when everything is working as it should...
what OBDII adds to this is it adds a second O2 sensor downstream from the cat. when a catalytic converter is doing it's job properly the O2 readings should oscillate at a much slower rate than it does before the catalytic converter as a result of the chemical conversion that the catalytic converter is there for. the slowing down of the oscillations is the sole way of the ECU knowing that the catalytic converter is doing it's job efficiently.
so the ECU compares the frequency of the oscillations before the cats to the readings behind the cats... if the rear O2 sensor is changing much slower than the front O2 sensor then it thinks the cat is doing it's job, no trouble codes are generated because every things fine according to what it see's.
where the spacers come into play is, the spacer takes the second sensor element after the cat, which is supposed to be in the direct stream of flow & recesses it into a little cave like chamber that is off to the side of the main exhaust flow. this results in the exhaust gas in the little side chamber changing much less quickly than it would had it been in the main exhaust stream. this slowing down of the changing of the exhaust gas around the sensor obviously results in the readings from that sensor slowing down too. the ecu sees this as the cat is working... this works even with no cats at all because it does the same thing, simply slow down the readings from the second sensor...
I'm not sure if the downstream O2 sensors can be turned off in the flashed rom...
in closed loop the O2 sensor gives feedback as to rich or lean condition...
the computer then compares this actual reading to a predetermined ideal target parameter that it reads from a map & it compensates & adjusts according to the feedback from the O2 sensor.
if it's lean relative to the parameter it wants to see then it will add to the fuel count. eventually it will become rich, it then takes away from the fuel count, it then eventually runs lean & it again adds to the fuel count.
this all happens in milliseconds & it's a constant waveform of rich-lean-rich-lean-rich-lean at many times per second & all oscillating above & below, but right around it's targeted parameter for the most part when everything is working as it should...
what OBDII adds to this is it adds a second O2 sensor downstream from the cat. when a catalytic converter is doing it's job properly the O2 readings should oscillate at a much slower rate than it does before the catalytic converter as a result of the chemical conversion that the catalytic converter is there for. the slowing down of the oscillations is the sole way of the ECU knowing that the catalytic converter is doing it's job efficiently.
so the ECU compares the frequency of the oscillations before the cats to the readings behind the cats... if the rear O2 sensor is changing much slower than the front O2 sensor then it thinks the cat is doing it's job, no trouble codes are generated because every things fine according to what it see's.
where the spacers come into play is, the spacer takes the second sensor element after the cat, which is supposed to be in the direct stream of flow & recesses it into a little cave like chamber that is off to the side of the main exhaust flow. this results in the exhaust gas in the little side chamber changing much less quickly than it would had it been in the main exhaust stream. this slowing down of the changing of the exhaust gas around the sensor obviously results in the readings from that sensor slowing down too. the ecu sees this as the cat is working... this works even with no cats at all because it does the same thing, simply slow down the readings from the second sensor...
I'm not sure if the downstream O2 sensors can be turned off in the flashed rom...
Hey welcome to the forum and the expanding VK brotherhood =)
Started my engine mods with:
• Invidia true dual exhaust (changed it out to the Nismo recently)
• JWT Popcharger (changed it out for the INJEN recently)
• Manual to E-fan conversion
• UPREV tune
In process:
• S2 CAM's from JWT
• Custom built 304 4-2-1 long tube headers
• Reworked TB
• Reworked manifold
Considered HC pistons but balked at the price (for now =)). Would be a nice gain across the entire power range.
No previous track runs but I have plans to take it out once the work is dialed in. Sounds clips will definitely be posted, really looking forward to the CAM lope.....
Sideways the Seven
Member
Glad to see you made it over bro. Hopefully as we work on ours we can get more and more people interested on modifying these things as a lot of the M crowd seems to be more interested in wheel fitment. I see some real potential in the VK45.
Looks good bro, really well made!
Slamming45
Member
Sweetness, looks freak'n amazing!