Put cats back on

same as you, tried the O2 extenders but they didn't work. False codes were tricking the engine to run richer according to the dealer's SD2. Put stock cats back on. No CEL's and no codes. And about 3 dB quieter (WAF went up too)

 

A custom ECU tune is a great alternative to putting the stock cats back on that will gain you more performance, but also remove the CEL as a byproduct.

Fabspeed also utilizes the highest quality HJS 200 Cell directional sportcats to use in place as a medium between OEM cats and Catbypass pipes. The 200 cell sportcats do not trigger any CEL but still give you a big increase in throttle response, performance and sound over OEM cats.

 

My Fabspeed SCUD Cats did trigger a cell & they have with many other Clients so I would be careful with that claim Evan

 

The best way would be test pipes and send ecu's for program adjust. A bit pricey but worth it if your willing to spend.

R

 

This is my first knowledge of your situation. PM me and I will be happy to work with you to get you taken care of! There should be no CEL with the 200 Cell HJS directional cats, that's why we have to use the directional cats in the first place.

Either way, the ECU tune is the only 100% sure fire way to get rid of the CEL when running a catbypass set up. I have been looking into and educating myself on O2 sensor emulators for a possible solution as well but have not figured anything out just yet.

 

The only function of the post cat O2 sensors are to test the efficiency and operation of the cat itself by comparing the readings to that of the pre-cat O2 sensors. The Pre-cat, or primary O2 sensors are the ones that you cannot mess with because they are responsible for monitoring and relaying the engines running characteristics.

 

Crazy talk.

 

Agreed. While the 430 sounds great.. The 360 has such a distinctive howl to it! Our Spider with our full exhaust (of course ) raises the hair on the back of my neck every time!

 

People always say the 360 has a distinctive sound and the best of ferraris ( 355 got the same praise)

don't both 355 and 360 have 5 valves per cylinder?

 

yep. 430 has 4/per.

 

I've had my ecu's tuned with my full catless set up and it through a codes all of the time. maybe a combination of sport cats and o2 extenders is the trick. <shrug>

 

Who did your tune? There is no way with a proper tune that you should be throwing CEL. You might have faulty sensor(s). You can swap the rear O2 sensors from side to side and see if the code changes. If you take the Bank 1 rear O2 sensor and install it in bank 2 and the code switches from a bank 1 code to a bank 2 code, then you know that it's a bad sensor. If you take the rear O2 from Bank 1 and put it on Bank 2 and the code stays as a Bank 1 code, then you know that is in an efficiency code. If you have a bad sensor, the code will follow it regardless of what bank you install it in.

 

Hi Evan, it was another vendor with a good rep like Fabspeed. From my extensive search on here, I don't see anyone has had 100% success. Both of my sensors are good as I throw codes for both sides. I just clear them and continue on. But, I have to pass a smog test now so I'm going to put the stock cats in and accept the mild exhaust note.

 

Man, some of these cars are just tricky!! I personally haven't had any issues with the tune and catbypass, but from my experience the CEL experiences vary so much from car to car and user to user. Some will say that they run catbypass with no tune and no O2 extenders and have never had a light. Some people will say they run high flow cats, with extenders and a tune and still have a light!

My experiences both with the HJS 200 Cell cats that Fabspeed uses, and the tuning company that we use for those running test pipes have been nothing but positive!

Good luck to you, don't hesitate to let me know if you think I can help you in any way.

 

'preciate it Evan. I've had nothing but positive customer service from you guys. cheers!

 

Thanks again

 

And I can say that every product I have bought from Fabspeed over the last 15 years for my Porsches and Ferraris I happily no longer own, despite the fact that I kept hoping, the Fabspeed Scuderia Cats being the very last

 

My point exactly. Not sure how removing cats will change how rich or lean the engine will run. The pre cat sensor input will change how Ritchie the engine runs.... But that's before the cat. Post cat sensor is basically a means to monitor the function of the cats for environmental protection purposes.

May have missed it but did u mention what the codes were initially, or after the bypass install, or after the extender install?


Sent from my iPhone using Tapatalk

 

360+volt=Prius, You are absolutely right. A high flow cat or catbypass will not effect the engines running. It is well within the capabilities of the OEM ECU to adjust the fuel mixture to reflect the changes to the exhaust.

RichardCH, sorry for your experiences that played a roll in your feelings towards Fabspeed. I specifically said in my earlier post in this thread to PM me and I will try to help rectify whatever happened with you. I have never met you, nor did I deal with your original order and yet I was willing to take the time out of my day ( I am not hourly, either ) to help make you happy and you never reached out to me, but continue to bash the company.

This thread has been very helpful both with the knowledge shared collectively by the contributors and also by myself having shared some knowledge that I gained from getting my degrees. I would like to try and keep it that way. This forum is a valuable resource for people and I understand you had a bad experience but this is not the thread to state that in. I am still open to having you reach out to me so I can hear your thoughts and potentially help you with a solution.

 

some people are cutting into the stock header and removing the precat and welding it shut. There have been no CELs reported