BRZ / FR-S Boxer Engine Dyno Powerband revealed
 

Official BRZ/FR-S Boxer dyno chart from the new Official BRZ JDM website


Attachment 4567


Needs a tune ?

Maybe? But then, how much more power would a tune get?
Can you share us the source of this graph? 25% drivetrain loss is quite a lot.

I don't like that dip in the tq curve around 4k rpm. Wonder why...?

Looks similar to the extrapolated curves we saw based on the now deleted video of the 86. Same drop at 4000rpm even. How many kW is that, ~147? 147kW = ~188hp according to the conversion table I'm using. Might be an engine dyno rather than a chassis dyno.

Look at the units. It's kW, not HP. And the dip in 4K, I believe, has theoretically been attributed to the D-4S system switching over injectors.

It's in kW, and 147kW is 197hp as advertised.
OrbitalEllipses, no it hasn't been attributed to that, may I suggest you go read the intriguing discussion we had on this? :)
Port injection is turned off well before 3000rpm. Currently that drop is somewhat of a mystery. I believe it can be tuned away.

Thanks for the heads up on the units. Makes sense now.

Hope the tuners can work their magics and alleviate the torque dip with simple mods like ECU tune (probably not an easy feat to accomplish though...)

Oh? I thought that's what I read on it. Is it in the D-4S thread or the 170rwhp thread? Link?

WHOOPS. Read the wrong line. I was looking at 140kW. So it's chp and not whp...

Also heads up: torque units are wrong. It's in N-m not kg-m.

The dip should not be a problem, as I have it on my Alfa and I with a tune I can flatten it without problem. But with DI it could be different though, but I still don't think so.

Engine tech. Well, arghx7 copied a chart from the 2GR-FSE technical paper that showed the port injection/direct injection usage map. We dug up some info on how VVT-i is controlled, and found that there is a large amount of internal EGR going on for emissions reduction apparently, and the particular way that they set this up could be affecting midrange torque. However seeing that torque is very strong at 3000rpm suggests something else is at work.

However it could just be an intake/exhaust tuning thing, in which case you probably can't dial it out in the ECU.

Without the drop you would get maximum torque from 3.000 RPM to 7.000 RPM what would be a 4.000 RPM band, as better than its turbocharged rivals. It is nice that the torque keeps up to max power.

Agreed on the unwearying tq up to 7k. Very nice indeed! What was the cause of the dip in Alfa (albeit the absence of DI)?

Curious to see how much we can get out of the normative I/H/E and the tune... Hopefully, we will able to see at least 10% gain.

I have a good feeling about N/A on this car. Hopefully alot was left on the table

I'm sorry but that's bs
It sais 200kg/m. Realy? 200nm yea but kgm hell no

They most likely meant 20.0 kg/m or N·m

The sharp drop in torque at 7000 suggests there is probably quite a bit of power that can be picked up imo, yea :)

The specs are 147kW and 205N-m, as per Subaru. The chart is mislabeled, I said that.

The dips in torque and hp may be caused by a valve controlled variable intake, which Toyota uses in many of their engines. What I mean is, by way of a valve, the intake length is effectively changed. All of the dyno charts I have seen from engines that use this type of variable intake suffer from significant dips in torque and slight dips in hp near the switchover point. Some (all?) lexus motors use three stage intakes to better avoid these dips.

That's a good point, I did not think about that for some reason.
The sharp drop at 7000 is a bit strange though, my guess is that will be easy to remove and thus make the last 500 rpm of the rev range more useful.

Perhaps they let off the throttle at 7000? :bellyroll:

In the ECU programming? :bellyroll:

soft fuel cut? it is only ~400 rpm so it is probably intentional to stop people driving hard into the limiter.