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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > What's the point??



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      07-09-2009, 11:31 PM   #1
dzenno
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What's the point??

..of o2 sensor holes on the catless downpipes and exhaust?? Why are the not closed at the bottom... Reason I say this is because I'm running a catless setup but can't/shouldn't run leaded race gas as not to damage these sensors that currently aren't being used for anything (faked out using o2 simms)...

If you ask why leaded, why not unleaded, many times unleaded isn't available where I am...
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      07-09-2009, 11:40 PM   #2
JayKay335i
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Unleaded is available where most others are.
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      07-10-2009, 12:06 AM   #3
dzenno
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Quote:
Originally Posted by JayKay335i View Post
Unleaded is available where most others are.
Haha dude, did you not read my post? I said its available but many times I'm there they've run out of it, like yesterday
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      07-10-2009, 09:47 AM   #4
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Just run xylene to boost unleaded octane. Leaded is bad for other things besides 02 sensors and cats if used enough.
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      07-10-2009, 09:50 AM   #5
dzenno
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Quote:
Originally Posted by AWD Addict View Post
Just run xylene to boost unleaded octane. Leaded is bad for other things besides 02 sensors and cats if used enough.
I said I was catless! Absolutely don't use leaded if you have your cats on, you'll damage them severely. I only used leaded, ONLY, because unleaded was unavailable "AND" because I'm running totally catless.

There is nothing that leaded gas can do to your car other than ruin cats if you have them and the O2 sensors...its just more stinky and bad for the environment...
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      07-10-2009, 08:36 PM   #6
dzenno
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So nothing else affected but cats and o2 sensors , final answer?
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      07-10-2009, 08:56 PM   #7
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The ECU depends on the O2 sensors to run.
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      07-10-2009, 08:59 PM   #8
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Quote:
Originally Posted by brianhn1 View Post
The ECU depends on the O2 sensors to run.
+1 ... the simms just scale the output
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      07-11-2009, 03:51 PM   #9
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So...plug them?
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      07-11-2009, 03:54 PM   #10
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I checked with a local airport and they only have low-lead 100 octane. I can't find anywhere else to get high octane gas. I am stuck with 93...

so I can see OP's point about leaded, too bad I can't use leaded with my car.
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