BGB Motorsports

You would know it immediately. You get a hard fault warning in red on the cluster and the car sounds like it's running on half the cylinders. Trust me...it sounds like it's broken. If you run the car out of gas on the race track and it stumbles more than once, it will also do this same exact thing so just beware, those of you that track and on the last session you try and stretch the fuel knowing that you may run out.

The tuners can turn this off in the firmware so if you do get a reflash, you will be fine. if you run manifolds with cats, this is not a problem. The single biggest issue is that the Cargraphic manifolds don't have a post cat O2 sensor bung, only a pre-cat one. Therefore there is no place to put the post cat O2 sensors in the stream and what you do end up getting are a bunch of faults for the ECU's thinking that the post cat o2 sensors are broken, stuck open, etc. I have this issue on my car and while it's annoying and while i'm told it can be turned off, i need to resolve it this week and at least get that thing in the stream somehow. I'm still massaging the firmware from having race headers and no place to hang the O2s. I have other customers that are driving around with plenums and race headers and CELs but they don't care because they're grinning ear to ear with the power improvements.

jmartpr

Thanks!


Maybe modifying the header with another O2 port/bung?
Not my case, but if you get CEL from Race header is there any adjustment from the ECU that could restrict performance?
Sent you the part number for the OEM manifolds via e-mail.....

jmartpr

Does anyone know if the Durometric works on the GT4 and can do the TB calibration?

user1029

Thanks for the response

As long as there is no detriment in power/no limp mode for not having cats, I might consider a race header. I don't want to mess with ECU reflashing just yet due to warranty issues. I'll just swap on the OEM header with new bolts if I do have a problem with the race header. My God this is a lot of potential incriminating evidence, I will delete these posts once you get back to me

BGB Motorsports

My plan is to blow a hole in the OE PSE over axle pipe and put it in there at the appropriate distance to the pre cat sensor AND maybe install one of those pseudo cats that Fabspeed or Big Daddy's Garage sells so that i can rule out too many outside factors. I can say for certain that the mixtures results to something of a fatter nature after 1 to 2 road tests with these faults. A drive from work to home sets it off about 2 miles into the ride to work the next morning. It's less than 10 miles from here to there and once it does, the mixture goes fatter like most things do so that the motor runs cooler and is protected. I bet ignition timing comes down as well but i can't say for sure.

I don't know how updated they have gotten over recent months. I also haven't checked in a while BUT they did have this capability for the 987.1 and 987.2 cars that were run on Bosch and then Siemens.

Let me see how my short term fix goes but i think there's a good chance you wont like the outcome. When tested, it was deemed that the race manifolds cause the car to run significantly fatter after installation. I don't want to advocate drilling holes in the stock PSE axle pipe and welding in an O2 bung BUT if it can silence a CEL it's worth it. I hate to be the bearer of bad news but if you run race headers, you have to assume it's going to affect the mixture, mileage, exhaust tip color, etc and set off a CEL. Let me see which CELs go away and which stay.

d00d

The 981 isn't in their revision list to be able to do TB adaptation, but the 987 is.

GAZZ

If your running catless, the post O2 sensor can be replaced with a dummy sensor which simulates a working one, thus fooling the ECU in thinking that the O2 sensor signal is normal.

jmartpr

If you move the second O2 after the header you may run out of harness to reach any port on the exhaust system.....the ide of a Mini-cat could work but not sure how long those last.

d00d

Looks like the Cargraphic Cup and Race X muffler have middle pipes that have the post catalyst bung, so a combination of race header that has the pre catalyst bung, and one of those two gives a place to mount all four O2 sensors.

jmartpr

Well.....at least the 981 Cup exhaust system doesn't have it. I have that exhaust on my car.

user1029

I'll go with sport headers then

The cargraphic sport header has post cat O2 bung?

d00d

Odd, I'm going by what I see on Cargraphic's site, as well as a picture on BGB's.

Yes, both pre and post.

jmartpr

Maybe they can do customs middle pipes or have an optional one. The one I have on my car don't have it anywhere.....but make sure the picture is not from a 987.

d00d

Yeah, the picture on BGB's site is marked 987 and has a bung and flex section, where under GT4 on the Cargraphic site it has a bung but doesn't have the flex section.

John@Fabspeed

Full transparency: During development testing, we did not throw a CEL at any time, and we thanked the heavens and thought it magic! Sadly, it's too good to be true for all. We are hearing reports from customers that they ARE getting check engine lights. We've been having great results with O2 spacers to eliminate them should anyone not want to tune their car. If anyone is having any issues and a solution is needed, please let me know.