BRZ / FR-S Boxer Engine Dyno Powerband revealed

[OrbitalEllipses]

Originally Posted by 70NYD

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

Originally Posted by dabocx

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

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

[ahausheer]

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.

[serialk11r]

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.

[OrbitalEllipses]

Perhaps they let off the throttle at 7000?

[serialk11r]

In the ECU programming?

[cossey]

Originally Posted by serialk11r

In the ECU programming?

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

[old greg]

Originally Posted by serialk11r

In the ECU programming?

Hey, it is DBW after all.

With such a precipitous drop off it's either artificial, or the airflow is choking somewhere, hopefully not in the head.

[Snaps]

And noone's mentioned yet that that is clearly a very "smoothed" graph - so the sharp cutoff at 7000 will be a transition rather than a quick reduction when we get a true dyno chart.

I would however say that I'm surprised they haven't used different cams to bring the torque band back a bit, bringing the power peak back in the rpm range as well - this should have given a flatter torque curve (less of a dip in the middle), and I don't see why they couldn't have made the same power with that setup... :S Maybe for modifications - maybe the cams are designed slightly more for people raising the stock rev limit or making high flow mods (I/H/E) to get the most power?

[catharsis]

After looking at the chart, I feel a big optimistic. The torque maxing out at 3k rpm is very nice indeed. Especially if you want to autox or track this car. I think the lines can be smoothed out with a simple tune and bolt ones, it still won't be a monster. But for autox it might do quite well depending on its class.

[vivix]

that torque table that just plummets after 7k could probably be extended a good bit. its going way too strong for that much of a drop off naturally. heres hoping they left it all on the table, ready for tuners to unlock

[carbonBLUE]

Originally Posted by catharsis

After looking at the chart, I feel a big optimistic. The torque maxing out at 3k rpm is very nice indeed. Especially if you want to autox or track this car. I think the lines can be smoothed out with a simple tune and bolt ones, it still won't be a monster. But for autox it might do quite well depending on its class.

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


over this graph (size and strech it accordingly) so i can see how much better the fa20 is compared to a stock 2zz-ge

[Jordo!]

It's not scaled the same...

[serialk11r]

Originally Posted by Jordo!

It's not scaled the same...

Yea but the torque drops off more on the 2ZZ (120ft-lb to 100ft-lb before the cams switch) than the FA20's drop at 4000 (200Nm to 180Nm). The FA20 is smoother, although it starts off weak in the low range because of the fixed duration cam.

[bambbrose]

Originally Posted by carbonBLUE

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


over this graph (size and strech it accordingly) so i can see how much better the fa20 is compared to a stock 2zz-ge

Freehand bitches :happy0180:

One is at wheels and the other is at crank. Can't compare, so I did it with 15% loss


yellow and purple are best guesses.

midrange torque is dramatically improved.