BRZ / FR-S Boxer Engine Dyno Powerband revealed - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

serialk11r · 02-06-2012, 06:27 AM

Nah that's the intake noise piping thing. Supposed to give the engine more audible growl as the rpms pick up. I think I'm going to remove that crap.

Levi · 02-06-2012, 06:41 AM

Quote:

Originally Posted by serialk11r

Nah that's the intake noise piping thing. Supposed to give the engine more audible growl as the rpms pick up. I think I'm going to remove that crap.

Yes me too I'd remove it. It just thought it could be restrictive what would explain the drop in power and torque.

serialk11r · 02-06-2012, 06:46 AM

It's possible that it affects tuning but it looks like a pretty small tube so I don't think it'll have much of an effect. But IMO the idea of piping engine noise into the cabin is pretty stupid.

7thgear · 02-06-2012, 09:36 AM

Quote:

Originally Posted by serialk11r

It's possible that it affects tuning but it looks like a pretty small tube so I don't think it'll have much of an effect. But IMO the idea of piping engine noise into the cabin is pretty stupid.

beats this,

[u2b]vLs8YcWMIx4[/u2b]

Guff · 02-06-2012, 10:59 AM

Quote:

Originally Posted by 7thgear

beats this,

[u2b]vLs8YcWMIx4[/u2b]

Lol

Dimman · 02-06-2012, 11:18 AM

My theory on the dip is acoustics. We haven't heard of any variable intake configuration so I think this is a pipe (exhaust and/or intake length) induced 'flat-spot' like on bikes.

Reason being is for the sizing to flatten out the curve as much as it does on either side of a more natural inertial torque peak of ~4800 rpm, there will be neg(intake) or positive (exhaust) waves that had to be accepted as a compromise.

A header and AVCS tuning can probably 'fix' this, likely by moving the torque/power curve up the rev range, but naturally sacrificing the low.

Ryephile · 02-06-2012, 11:29 AM

Quote:

Originally Posted by Levi

Official BRZ/FR-S Boxer dyno chart

The curve is actually very good. 90% torque from about 2,500 to 7,450 RPM. That's great. The little dip in the midrange will likely barely be felt. Dimman might be right on the acoustics; but we'll have to wait and see for sure as we start fiddling with both hard parts and ECU tuning.

I have a hunch there's torque left on the table at 3K and 5-7K RPM, where the torque mysteriously shelves perfectly flat. Porsche's n/a curves are curiously similar.

Dimman · 02-06-2012, 11:53 AM

Quote:

Originally Posted by Ryephile

The curve is actually very good. 90% torque from about 2,500 to 7,450 RPM. That's great. The little dip in the midrange will likely barely be felt. Dimman might be right on the acoustics; but we'll have to wait and see for sure as we start fiddling with both hard parts and ECU tuning.

I have a hunch there's torque left on the table at 3K and 5-7K RPM, where the torque mysteriously shelves perfectly flat. Porsche's n/a curves are curiously similar.

Is this my 4th or 5th 'final answer' on torque? Heh...

Longhorn248 · 02-06-2012, 01:07 PM

I'm liking this graph, the flat torque curve above 4k is pretty exciting. *Sits down and waits for US pricing*

no_name · 02-06-2012, 01:21 PM

Quote:

Originally Posted by carbonBLUE

does anyone here think they can do an overlay of this graph

And with about 15% losses

7thgear · 02-06-2012, 02:13 PM

edit:

my mistake, you convereted the numbers correctly.

the reverse power/torque graph threw me off.

Dimman · 02-06-2012, 02:15 PM

Quote:

Originally Posted by 7thgear

EPIC FACEPALM

you can't overlay graphs measured in different units!

Second one in the post just above looks converted to match the 170whp from the vid.

cassidy0998 · 02-06-2012, 03:13 PM

I hate looking at the numbers of this car on paper...

Nurburgring · 02-06-2012, 03:39 PM

Comparison 1:
Honda S2000 (F20C engine) vs Toyota FT86:

02-06-2012, 02:13 PM	#53
7thgear i'm sorry, what? Join Date: Jan 2012 Drives: Canada Location: I rock a beat harder than you can beat it with rocks Posts: 4,399 Thanks: 357 Thanked 2,508 Times in 1,268 Posts Mentioned: 40 Post(s) Tagged: 3 Thread(s)	edit: my mistake, you convereted the numbers correctly. the reverse power/torque graph threw me off. __________________ don't you think if I was wrong, I'd know it?

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