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Old 11-10-2009, 03:08 PM   #1
davericher20
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OBD1 vs OBD 2

can anybody tell me what the difference is?

I went to pick up parts from a guy a long time ago and he said he converted his OBD2 to OBD1 and me and my buddy had no clue why.......OBD1 is better?
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Old 11-10-2009, 03:22 PM   #2
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from what I gather, amongst other things, the intake manifold is different, less restricted air flow?? not sure, e36 M3's like doing the OBD1 swap for torque purposes. Otherwise im stumped...
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Old 11-10-2009, 04:08 PM   #3
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Its a different computer system running the motor.

OBD1 is easier to tune, easier to get more power out of. The manifolds aren't actually related to OBD1 or 2, it just so happens that BMW put a more restrictive manifold on OBD2 cars. (This has to do with emissions moreso than computer programming).

In short, obd1 is better, because an OBD2 motor properly converted to OBD1 will make more power.
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Old 11-10-2009, 04:29 PM   #4
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OBDII is more advanced, it can monitor alot more of what is going on with the engine, more so on the emissions side. You'll see obdII e36s have 4 o2 sensors, this is part of that more restrictive emissions system.

an obdI 95 m3 has a 3.0L engine and makes 240hp
an obdII 96+ m3 has a 3.2L engine and makes 240hp, slightly more torque.

Technically speaking OBDII is superior, but BMW used it to be more restrictive with emissions.

OBDI isn't really better, it just "easier" to make more power with in the case of bmws. I think this is changing now as tuners have cracked the OBDII system and they have more control over it now than they did before, i think if all the restrictions were removed and the motors were the same, obdI vs. obd II wouldn't matter.
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Old 11-10-2009, 05:47 PM   #5
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OBD I is simpler.
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Old 11-10-2009, 06:15 PM   #6
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thanks guys starting to make sense now

and John from bimmersport, what's your username on here?
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Old 11-11-2009, 02:30 PM   #7
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johnny blaze i think?
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