O2 FB vs. Accel Fuel | AEM
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sbrunthaler
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Joined: 06/16/2014 - 09:48
O2 FB vs. Accel Fuel

Hi, I try to optimize the O2 FB on my AEM EMS2 (3000GT VR4).

Problem: O2FB should turn off when accel fuel is active, but the threshold for this is at 49mS accel fuel. This value can never be reached in my setup - something like 18mS could be possible at maximum: 7mS maximum value from fuel table, accel fuel max = 130% -> 17.5mS. The 49mS still is the value from the 3000GT default map. So O2 FB is always active and destroys the accel fuel effect, at least at low load conditions.

Is there any reason why it must be that high, or is it just wrong? I would try, but I dont want to break something.

Thanks, Stefan B.

AEM_NS
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Last seen: 7 hours 28 min ago
Joined: 06/06/2014 - 09:31
It's a fully tunable engine

It's a fully tunable engine management system. Don't be afraid to tune it.

sbrunthaler
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Last seen: 3 weeks 2 days ago
Joined: 06/16/2014 - 09:48
:) OK, will do.

:) OK, will do.

But I am wondering how the default map for the 3000GT was created, and if all parts of the map were tuned for real driving? Don't bother, just my german perfectionism.

Thanks,

Stefan

 

AEM_NS
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Last seen: 7 hours 28 min ago
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I'm not sure where it was

I'm not sure where it was stated that the base cals were ever fully tuned for good drivability. The only purpose of the base cals were to get an engine to start, run and hopefully idle decently which is a good point for someone to start tuning from. Also, many of the cal values were just copied and pasted over from old Series 1 cals. Most times when we validate a base cal, it's not drivability we check - it's maximum load, maximum power output. We ensure that we're able to at least match stock power and typically can usually make more than stock. Everything else is just roughed in with the expectation that fine tuning will be handled by the end user.