BRZ / FR-S Boxer Engine Dyno Powerband revealed

[old greg]

Originally Posted by 2fast4you

if anything, it'll smooth out the bump between 2500-3500 rpm.

I see what you did there.

[jamsbong]

THe torque curve looks quite good considering that it is an NA engine. with most of the torque available from 2500 - 7000RPM.

There could be a number of reasons behind the dip ranging from switching of valve timing, axillary components, intake and exhaust resonance, etcs.

For me, this slightly bumpy torque curve will give the engine a unique character. It probably won't win races but it will be more exciting to drive as the driver anticipate the torque build-up then followed by a rush from 4k to 7k (3000RPM).

[Gardus@Supersprint]

Can't wait to test one on our MAHA dyno...

[ahausheer]

Do you really feel torque? I thought it was Hp that actually moved the car, if anything you might feel the slight dip in Hp. Am I wrong?

[bambbrose]

Originally Posted by ahausheer

Do you really feel torque? I thought it was Hp that actually moved the car, if anything you might feel the slight dip in Hp. Am I wrong?

Yes, you are

You feel torque. Horsepower is just a function of torque/rpm.

[Guff]

Originally Posted by ahausheer

Do you really feel torque? I thought it was Hp that actually moved the car, if anything you might feel the slight dip in Hp. Am I wrong?

No, it's torque that moves the car, and that is what you feel. Horsepower is just some complex number: (torque X 5252)/rpm. It is important, but torque is what puts you back in the seat.

[Longhorn248]

Originally Posted by Guff

No, it's torque that moves the car, and that is what you feel. Horsepower is just some complex number: (torque X 5252)/rpm. It is important, but torque is what puts you back in the seat.

Yup! Dynos don't measure HP, they calculate it from the torque measurements.

[Homemade WRX]

Originally Posted by OrbitalEllipses

Yeah I thought your long-rod motors spun to 9K without problems. How's the thread on NASIOC where EQ's trying to trash the motor?

eh, he found he had no ground to stand on. It is however an engine that isn't for everyone.

Still trying to get reliability over 10k...need better valve springs.

[tranzformer]

Originally Posted by ahausheer

Do you really feel torque? I thought it was Hp that actually moved the car, if anything you might feel the slight dip in Hp. Am I wrong?

Yes, you definitely feel the torques.

[Dimman]

Originally Posted by tranzformer

Yes, you definitely feel the torques.

They say people buy horsepower but drive torque...

[7thgear]

how much for grade A horsepower? I think mine is a little on the lumpy side.

My neighbor has some torques though, maybe when he's on vacation i can take them for a spin.

[serialk11r]

Torque + gears determine acceleration. Power is speed dependent, but your butt can't feel speed for obvious reasons.
A lot of torque but overall low hp is useless because you can't use a good gear reduction ratio.

[Kostamojen]

Originally Posted by balance

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

That dip is apparent on every N/A Subaru dyno chart you will probably see, its attributed to the intake manifold for the most part:

[WingsofWar]

^ thats interesting

I have the same kinda scenario with my EJ251 (1999-2001 2.5RS engine). But its a single cam, non AVCS, oversquared engine.

vs Dual Cam, Dual AVCS, Squared engine.

There is quite a bit of difference between the EJ251 and FA20...

Yet we still see that same awkward dip.

Does the EJ20E and EJ204 and EJ254 see similar output characteristics? What about the FB20 and FB25? Id like to see them next to each other.