INSTALLED TESTPIPES A HOW TO WITH PICS

This is a really good thread...for the deaf.
Excellent pictures!!
It is lacking SOUND FILES.
Please post sound files so we too can share the Ferrari Dance Mamba 360.

 

Shoot, I can hear that thing running in my mind, like it's parked right next to me. Great post and pics.

 

Brad,

If I were you I would take note on this post and make sure there is no problem with the Air/Fuel mixture. If for some reason they get crappy either lean or rich there will be adverse effects. In the case of lean performance will be compromised and in the case of rich your pre-CATs will run hotter than normal and the latter will eventually destroy your headers. You might as well replace them now if you have the headers with pre-CATs (some early 99s and 2000 didn't have the pre-CATs). Plus you want to make sure the better sound didn't compromise your ECU and/or OBD set up.

Matt

 

Chris - the catalytic converters only clean (at the MOST) the last 5% of exhaust emissions.
I'm sure you'll know this but one of the functions of the pre-cat 02 sensor is to tell the ECU to fuel with certain parameters BEFORE exhaust flow goes through the cat.
This is once again adjusted by the ECU once the emissions have passed through cat and therefore the post cat lamda and the pre and post cat lamda readings have been compared.

According to a senior Ferrari technician MOST (i.e 95%) of the ECU fuel control (which relates to emissions) input comes from the PRE-cat sensor and only a very very small effect is attributed to the difference between pre and post cat sensor differentials.
Therefore even in a worst case scenario, the performance can only be *MARGINALLY* affected on the Bosch 7.3 ignition cars by de-catting. Bear in mind you don't need to trim back fueling by MASSIVE 5% to get within the 5% emissions cleaning margin that Cats are responsible for.

Ultimately 02 simulators can do away with the entire problem ANYWAY.

 

If that is the case where the pre cats clean 95 % of the exhaust fumes then if the rear cats are removed on a 360 then it should pass emissions testing!

Has anyone tested to see if there car passes without the rear cats in place??

Thxs

 

As I have posted before, I would refrain from posting info and photos admitting that you have violated Federal Law by removing your cats. One overzealous EPA employee, estranged spouse or pissed off employee on the internet could cost you your Ferrrai, a $50,000 fine and some time in the crossbar hotel.

 

Some cars do (especially 355s) pass the reasonably tough emissions test here in the UK without their cats.
P.S. I reckon Parkerfe probably has a point.

 

Here in California a new test has been implemented this year that is a bit more realistic and puts the wheels on a dyno to test emission in gear at certain rpm and speed while the wheels are rotating. I would be surprised if any high performance car passes the new smog test w/o the cats.

 

Thanks for the tip. Based on this, it certainly isn't worth it. For what? More noise, a little less weight, no thanks. You never know when your ******, beater driving neighbor is going to rat you out

 

Murcielago_Boy, Thank you for the info, I am very surprised that the main cat works on only 5% of the remaining exhaust emissions, but I guess that I was addressing the problem that this car is already throwing off the "out of range" codes, so as I am sure you understand that the final 5% makes a large difference in the post O2 reading. It is in this case that the ECU will not likely know which of it's two sensors , pre or post cat, has been sending false info back the the ECU and it will , over time, make corrective changes. As these systems are "adaptive", driving style, as well as other factors, will effect the outcome as well. I do not pretend to understand all of the safeguards and programing options the the good folks @ Bosch build into their very advanced control systems but I have learned over time that there are no "free lunches" @ this level of performance. As I said earlier , knowledge is king and I hope that Buttuz4eva shares with us his information. OBD II scan tools are now very easy to buy and use and it will give you a very good idea of what is going on with your cars ECU.

 

Wow... I wouldn't pay more than $20 for those pipes! Could easily be bent from scratch.

 

but I also own a company that does emission testing and I certainly would never remove the cats on my vehicle because it is against federal law to do so and furthermore I would never admit in writing that I own a company that fraudulently certifies vehicle as emission legal when in fact they have been illegally modified. It would put my company and my freedom at risk. But thats just me.

 

It says he is putting in "test pipes," for testing...he has his own dyno to do the test also...

 

Any one know of an instance where EPA went after an individual for tampering with their own car? They have a hard enough time keeping up with commercial tampering. I would be surprised if it ever happened. I contacted EPA years ago when a diplomat returning from Europe sold on of my customers a euro spec car. There was no way it would ever pass emissions. EPA could not have been less interested. They leave the policing up to the states, and it sounds like in this case no one will ever know. Maybe in California, but not the other 49.
Cheers,
Tom B.