275 hp vs 285 hp stock
#19
Re: 275 hp vs 285 hp stock
Originally Posted by sprfstz
I've got a 96 Z with the dual cats and was thinking about changing to a y-pipe off the headers into a single high flow cat, will that cause a problem with OBD-II?
#21
Re: 275 hp vs 285 hp stock
What are rear sims? I have the y pipe single cat on my 96' z and I think I keep throwing my o2 sensor code. I guess I need to get them programmed out of my pcm or I need to get those "sims". Thanks---
#22
Re: 275 hp vs 285 hp stock
Originally Posted by zackz28
The obd II & dual cats came in the last half of the 96 models all 95's are obd I & single cat. All 97's are the dual cats and obdII.
Here's a great site for 4th Gen info: http://www.f-body.org/faq/4/index.htm
#23
Re: 275 hp vs 285 hp stock
Originally Posted by Feenix
yes unless you get a tune for it and program out the rear 02's or get some rear sims to fool the PCM.
#24
Re: 275 hp vs 285 hp stock
Originally Posted by sprfstz
I've got a 96 Z with the dual cats and was thinking about changing to a y-pipe off the headers into a single high flow cat, will that cause a problem with OBD-II?
not sure if you have emissions laws up there or not. but if your gonna do that you may as well just get a ypipe without cats at all (or dual highflow cats), and then get the 02 simulators so your SES light doesnt come on. you can get the 02 sims at summit racing.
if you go from dual cats to a single cat, i would think that you would loose power. i believe they got more power from the exhaust rather than the obdII programming. the OBDII is just more emissions sensative. and more complicated.
#25
Re: 275 hp vs 285 hp stock
Originally Posted by 91RSLT1
Will this cause the car to fail the ODBII emmissions scan?
the sims wouldnt cause it to fail. but the sniffer test would if you didnt have any cats. or if it wasnt running as clean as it should. but you wouldnt know that cause the the PCM would think everything was fine, cause thats what the sims would be showing it.
if you tuned that code out of the pcm instead of using the sims, it would almost surely fail due to it not having that information to read during the test.
#26
Re: 275 hp vs 285 hp stock
Originally Posted by ss#1230
If you go from dual cats to a single cat, i would think that you would loose power. i believe they got more power from the exhaust rather than the obdII programming. the OBDII is just more emissions sensative. and more complicated.
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