cat bypass for obdII Anyone tried it yet?
03-28-2004, 01:11 AM
#1
Three Wheelin'
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cat bypass for obdII Anyone tried it yet?
I have seen that there have been quite a few successful installations of cat bypass pipes on obdI cars. Has anyone done it with an obdII system and been ok with the CEL? I want to have my computer reprogrammed at the same time. Would this take care of the potential CEL problem? Biannual exhaust check not an issue since in Ohio collectable cars (which all 993's qualify for) are exempt from e-check.
03-28-2004, 02:52 AM
#2
RL Technical Advisor
Hi Alex:
There are ways around a CEL problem with cat bypasses on OBD-II cars; '96-98,...
Please feel free to e-mail me directly for some assistance in this regard.
There are ways around a CEL problem with cat bypasses on OBD-II cars; '96-98,...
Please feel free to e-mail me directly for some assistance in this regard.
03-28-2004, 12:22 PM
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Three Wheelin'
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Thanks Steve,
As always you are a font of knowledge. I will email you next week when I get ready to purchase the cat bypass pipes.
Thanks so much.
Alex
As always you are a font of knowledge. I will email you next week when I get ready to purchase the cat bypass pipes.
Thanks so much.
Alex
03-28-2004, 04:15 PM
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Steve Weiner-Rennsport Systems
Hi Alex:There are ways around a CEL problem with cat bypasses on OBD-II cars; '96-98,...
Please feel free to e-mail me directly for some assistance in this regard.
Hi Alex:There are ways around a CEL problem with cat bypasses on OBD-II cars; '96-98,...
Please feel free to e-mail me directly for some assistance in this regard.
I'm in the middle of a cat bypass install on my 97, and could sure use some of your wisdom!!
Thanks!!
Peter
03-28-2004, 05:10 PM
#5
Don't be mislead by simple "workarounds", as the OBDII can't be fooled
very easily. The OBDII cars have four O2 sensors and as a result the DME
"knows" when the system is not normal. But like anything in life, if your
"pockets" are deep enough, most anything can be done and there's
always someone willing to take your money.
Furthermore, OBDII has enough problems as is without adding the potential
for more future problems. If you're unhappy with the performance, then buy
a turbo. These late model cars are not like the '80s and earlier cars that
you can easily "play" with without major long term problems.
The key point, though, is if you live in a "don't care" state, then you can
do basically anything, but there are few if any of those states left.
very easily. The OBDII cars have four O2 sensors and as a result the DME
"knows" when the system is not normal. But like anything in life, if your
"pockets" are deep enough, most anything can be done and there's
always someone willing to take your money.
Furthermore, OBDII has enough problems as is without adding the potential
for more future problems. If you're unhappy with the performance, then buy
a turbo. These late model cars are not like the '80s and earlier cars that
you can easily "play" with without major long term problems.
The key point, though, is if you live in a "don't care" state, then you can
do basically anything, but there are few if any of those states left.
03-28-2004, 09:45 PM
#6
Three Wheelin'
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obdII and cat bypass
Originally posted by Lorenfb
Don't be mislead by simple "workarounds", as the OBDII can't be fooled
very easily. The OBDII cars have four O2 sensors and as a result the DME
"knows" when the system is not normal. But like anything in life, if your
"pockets" are deep enough, most anything can be done and there's
always someone willing to take your money.
Furthermore, OBDII has enough problems as is without adding the potential
for more future problems. If you're unhappy with the performance, then buy
a turbo. These late model cars are not like the '80s and earlier cars that
you can easily "play" with without major long term problems.
The key point, though, is if you live in a "don't care" state, then you can
do basically anything, but there are few if any of those states left.
Don't be mislead by simple "workarounds", as the OBDII can't be fooled
very easily. The OBDII cars have four O2 sensors and as a result the DME
"knows" when the system is not normal. But like anything in life, if your
"pockets" are deep enough, most anything can be done and there's
always someone willing to take your money.
Furthermore, OBDII has enough problems as is without adding the potential
for more future problems. If you're unhappy with the performance, then buy
a turbo. These late model cars are not like the '80s and earlier cars that
you can easily "play" with without major long term problems.
The key point, though, is if you live in a "don't care" state, then you can
do basically anything, but there are few if any of those states left.
03-28-2004, 10:15 PM
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The computers on our cars have a learning element to them If the same code comes up consistantly and the code is reset, eventually the code will not come up (not for all conditions, but many of them). It assumes the condition is normal. I have cat bypasses and the CEL came on twice and was reset. That was almost a year ago now and no CEL or even codes in the computer.
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03-29-2004, 12:27 AM
#9
There are also "simulators" which plug into the O2 sensor which simulates a varying reading. This will also trick the DME into thinking that the 2nd O2 sensor is actually doing something. They are about $50 each and you need 2. There's more info in the archives if you want to go this route.
03-29-2004, 11:29 AM
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Originally posted by Jeff 993TT
There are also "simulators" which plug into the O2 sensor which simulates a varying reading. This will also trick the DME into thinking that the 2nd O2 sensor is actually doing something. They are about $50 each and you need 2. There's more info in the archives if you want to go this route.
There are also "simulators" which plug into the O2 sensor which simulates a varying reading. This will also trick the DME into thinking that the 2nd O2 sensor is actually doing something. They are about $50 each and you need 2. There's more info in the archives if you want to go this route.
...unfortunately, here in Illinois, they DO just plug into the OBDII BUT they also do a visual inspection with mirrors (actually look for the Cats under the car) ...AND the smell is a dead give-away!!!!!
....thus my reason for going the sport cat route instead...
03-29-2004, 12:22 PM
#12
Besides the CEL, there's the readiness states as part of OBDII.
Read the Technical page under "Fuel Injection Systems" on this
web site, www.systemsc.com, for some additional info about
OBDII and the readiness states.
Without the completion of the readiness states, e.g. after a reset
of the CEL or DME unit, the emissions test will be aborted in most
states.
Read the Technical page under "Fuel Injection Systems" on this
web site, www.systemsc.com, for some additional info about
OBDII and the readiness states.
Without the completion of the readiness states, e.g. after a reset
of the CEL or DME unit, the emissions test will be aborted in most
states.
03-29-2004, 12:39 PM
#13
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You guys may want to check your particular states' laws regarding collector cars. In Ohio all 911s classify as collector cars (all you have to do is pay some extra $'s for the plates). Once you have those you are exempt from echeck. Even though there is supposed to be a mileage maximum for collector cars in Ohio, I have talked to numerous people that have the plates and no one has been audited. Many use them as daily drivers - not a problem.
03-29-2004, 12:52 PM
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Originally posted by Lorenfb
Besides the CEL, there's the readiness states as part of OBDII.
Read the Technical page under "Fuel Injection Systems" on this
web site, www.systemsc.com, for some additional info about
OBDII and the readiness states.
Without the completion of the readiness states, e.g. after a reset
of the CEL or DME unit, the emissions test will be aborted in most
states.
Besides the CEL, there's the readiness states as part of OBDII.
Read the Technical page under "Fuel Injection Systems" on this
web site, www.systemsc.com, for some additional info about
OBDII and the readiness states.
Without the completion of the readiness states, e.g. after a reset
of the CEL or DME unit, the emissions test will be aborted in most
states.
03-29-2004, 12:58 PM
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Alex,
one other thought... you may want to see someone's car that has cat bypass pipes. the smell is potent!!! i put a set on my 964 once and took them off within 2 weeks. Everytime i pulled into garage, stopped at a light with the top down ... - it was just simply nasty!
cheers,
boris
one other thought... you may want to see someone's car that has cat bypass pipes. the smell is potent!!! i put a set on my 964 once and took them off within 2 weeks. Everytime i pulled into garage, stopped at a light with the top down ... - it was just simply nasty!
cheers,
boris