Nameless Performance BRZ Axleback Exhaust

[vtmike]

Originally Posted by sierra

I would say something like Ecutek solved the problem?

Wasn't under the impression they were including a tune on their claimed gains with the axleback and downpipe combo. Would be interesting if that was the case.

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[sierra]

Originally Posted by vtmike

Wasn't under the impression they were including a tune on their claimed gains with the axleback and downpipe combo. Would be interesting if that was the case.

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I'm sure the initial gains for the axleback helping to fill the torque dip and the overpipe/downpipe power gains at the top end were without a tune.
The latest headers and exhaust would have been severely limited, maybe even detrimental without a tune. I remember reading that they tuned the ECU for that but felt they could improve on that tune given more time.

Hope i'm right and not getting into deep poo?

[vtmike]

Originally Posted by sierra

I'm sure the initial gains for the axleback helping to fill the torque dip and the overpipe/downpipe power gains at the top end were without a tune.
The latest headers and exhaust would have been severely limited, maybe even detrimental without a tune. I remember reading that they tuned the ECU for that but felt they could improve on that tune given more time.

Hope i'm right and not getting into deep poo?

That's what I was thinking.

If you dig way back in the thread their is a link to another dyno thread where Jason was saying their testing with the downpipe and axleback wasn't yielding power gains and speculated it was the ecu. Then fast forward and their is a dyno for those parts that show gains.

Maybe it was oil temps or something dragging the numbers down but couldn't find an explanation in my searching. Might ask him myself Monday. Just curious.

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[sierra]

Originally Posted by vtmike

That's what I was thinking.

If you dig way back in the thread their is a link to another dyno thread where Jason was saying their testing with the downpipe and axleback wasn't yielding power gains and speculated it was the ecu. Then fast forward and their is a dyno for those parts that show gains.

Maybe it was oil temps or something dragging the numbers down but couldn't find an explanation in my searching. Might ask him myself Monday. Just curious.

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Yes, me too.
I get the impression the ECU and mechanical limits of the engine are very high because a turbo running up to 8psi can be accommodated by a tune.
The self learning limits of the ECU seem very tight and restrict gains.
If we could raise those restrictions would it mean the ECU would adjust to modifications over time?

[vtmike]

Originally Posted by sierra

Yes, me too.
I get the impression the ECU and mechanical limits of the engine are very high because a turbo running up to 8psi can be accommodated by a tune.
The self learning limits of the ECU seem very tight and restrict gains.
If we could raise those restrictions would it mean the ECU would adjust to modifications over time?

That's what I was wondering. If they reset the ecu for each dyno run, but then does the ecu start limiting power later?

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[sierra]

Originally Posted by vtmike

That's what I was wondering. If they reset the ecu for each dyno run, but then does the ecu start limiting power later?

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I think the reverse happens. The reset limits the power and the relearn increases the boundaries over several hundred km's.
Try a reset on yours, by the book and see what you think?

I did it on mine expecting a power increase and got the opposite. Even the throttle delay was back and it took some time to get back to full power.
It felt flat, almost lethargic by comparison.
Maybe that's how they enforce a run in period from new?

[OrbitalEllipses]

Originally Posted by sierra

I think the reverse happens. The reset limits the power and the relearn increases the boundaries over several hundred km's.
Try a reset on yours, by the book and see what you think?

That's usually what occurs after time, but from what I've read the first pull is often usually best (IAM resets and knock learning from prior are forgotten).

[mad_sb]

Originally Posted by OrbitalEllipses

That's usually what occurs after time, but from what I've read the first pull is often usually best (IAM resets and knock learning from prior are forgotten).

the first will only be the best if a tune is involved and the IAM has been set to an intial value of 1.0 (100% ignition advance map added to base ignition timing). With a stock tune IAM is .7 (70% of advance map + base timing).

The two main things that settle in after an ecu reset are IAM (either up or down depending on how it is set in the tune) and Fuel trims (which are applied in open loop).

There are some learned values for throttle fully open and fully closed and i believe cam position offsets etc but i belive those are set during the first 30 seconds after reflash / reset and restart. not 100% sure on those.

[vtmike]

Interesting. Is it recommend to do a reset after installing modifications?

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[mad_sb]

Originally Posted by vtmike

Interesting. Is it recommend to do a reset after installing modifications?

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The honest answer is it depends...

If you have the ability to monitor fuel trims and AFR etc in real time I would not be so worried about it as everything will adjust over time. These cars with stock tune can stack up a large long term trim for the high load (WOT) area very quickly due to how long they hold closed loop on the stock tune. IF that trim is negative, I would reset.

It's ceratinly not going to hurt anything to do a reset in most cases but i would want to monitor afr WOT after making any changes. And you can do that with any obdII utility.

[FR-S Matt]

Probably a stupid question, but would driving spirited POST local tune be a dumb thing to do for the next 50-100 miles or would that even matter? Not sure how this ECU learns things but it is certainly strange to me how it functions.

[vtmike]

I have the torque pro app, I'll have to start monitoring that.

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[OrbitalEllipses]

Oh god I never want to reset the ECU ever again. Throttle dead spot is goddamn terrible.

[FR-S Matt]

Just got word my Axleback was delivered to Titan today and will be shipping to me tomorrow.

The Nameless guys are super busy, but I got a chance to talk to Jason again today. This is all I have: